Contents
2013
Volume: 33 Issue s1
22 Article(s)
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[in Chinese]
Vicarious Calibration of MODIS Based on PY30-1 Platform in South China Sea
Gao Fei, Zhu Jianhua, Yang An′an, Li Jun, and Han Bing
In order to improve the quality of ocean color satellite remote sensing data and achieve quantitative applications, the accurate calibration of satellite sensor is the key. By using the water and atmospheric optical parameters measured in the South China Sea PY30-1 platform, we have carried out the vicarious calibratioIn order to improve the quality of ocean color satellite remote sensing data and achieve quantitative applications, the accurate calibration of satellite sensor is the key. By using the water and atmospheric optical parameters measured in the South China Sea PY30-1 platform, we have carried out the vicarious calibration of Aqua satellite′s moderate-resolution imaging spectroradiometer (MODIS) sensor by reflectance-based method. Our results show that the calibration gain factor is very close to the MODIS research. In addition to 443 nm band, the calibration gain factor relative deviations were less than 5%. This study shows that the reflectance-based method can be applied to the China Sea, we can get the accurate calibration gain factor..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 101002 (2013)
Analysis of the Aerosol Optical Characteristics on PY30-1 Platform in South China Sea
Gao Fei, Zhu Jianhua, Yang An′an, Li Jun, and Han Bing
By obtaining data of the CE318 automatic sunphotometer installed on the PY30-1 platform from September 2011 to October 2012, the aerosol optical characteristics in South China Sea is studied. The main aerosol optical parameters are aerosol optical thickness, Angstrom exponent, complex refractive exponent, single scatteBy obtaining data of the CE318 automatic sunphotometer installed on the PY30-1 platform from September 2011 to October 2012, the aerosol optical characteristics in South China Sea is studied. The main aerosol optical parameters are aerosol optical thickness, Angstrom exponent, complex refractive exponent, single scattering albedo and scattering phase function. Carrying out research of the aerosol optical characteristics in South China Sea, is an important part of calibration and validation of satellites. The results show that the aerosol optical parameters are similar with the coastal mode, and can be used for calibration and validation of satellites..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 101004 (2013)
Fiber Optics and Optical Communications
High Temperature Resistant Metal Packaged Multiplexed Fiber-Optic Extrinsic Fabry-Perot Interferometer and Fiber Bragg Grating Sensor
Li Jieyan, Zhang Dongsheng, Zhou Zude, and Guo Yongxing
A multiplexed fiber-optic sensor combining the advantages of extrinsic Fabry-Perot interferometer (EFPI) and fiber Bragg grating (FBG) is presented for simultaneous stress and temperature measurement. Ultra-high-vacuum magnetron sputter system, electroplating technology, and laser welding technology are adopted to realA multiplexed fiber-optic sensor combining the advantages of extrinsic Fabry-Perot interferometer (EFPI) and fiber Bragg grating (FBG) is presented for simultaneous stress and temperature measurement. Ultra-high-vacuum magnetron sputter system, electroplating technology, and laser welding technology are adopted to realize fiber sensor encapsulation without adhesives, which can improve the resistance to elevated temperatures of the sensor. Experimental results show that the sensor has a stress sensitivity of 90 pm/N and a linearity of 0.9965 at the temperature of 290 ℃. FBG of the multiplexed sensor has a temperature sensitivity of about 12 pm/℃ and a linearity of about 0.9988. Broad applications based on the metal packaged multiplexed fiber optic EFPI-FBG sensor at higher temperature in this work can be expected..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 106002 (2013)
Application of a New Wavelet Denoising Method in Optical Fiber Strain Measurement
Zhang Zhihui, Zhang Peng, and Han Shunli
The Brillouin distributed optical fiber sensing technology can measure the optical fiber strain, but the measurement precision is affected by noise easily. So a new method of wavelet denoising is developed to enhance the measurement precision of optical fiber strain. The new method not only takes the wavelet transform The Brillouin distributed optical fiber sensing technology can measure the optical fiber strain, but the measurement precision is affected by noise easily. So a new method of wavelet denoising is developed to enhance the measurement precision of optical fiber strain. The new method not only takes the wavelet transform detail coefficients to threshold quantification, but also removes the noise from the approximation coefficients. So the new method can also obtain high precision Brillouin spectrum with fewer decomposition scales as the signal-to-noise ratio (SNR) of Brillouin spectrum is low. The research results show that the method can reduce the Brillouin spectral noise effectively. Compared with the conventional wavelet denoising method, the new method can decrease the wavelet transform calculation and the denoising effect is better, so the optical fiber strain measurement is more accurate..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 106003 (2013)
Impact of Optical Intensity Perturbation on Heterodyne Demodulation Scheme
Jiang Peng, Zhang Nan, Xiong Shuidong, and Ni Ming
The basic principle of heterodyne demodulation of fiber interferometer is introduced. The influence of optical intensity perturbation on heterodyne demodulation based on differential cross-multiply (DCM) and arctangent is researched. Theoretical analysis and numerical simulation are adopted. Theoretical analysis demonsThe basic principle of heterodyne demodulation of fiber interferometer is introduced. The influence of optical intensity perturbation on heterodyne demodulation based on differential cross-multiply (DCM) and arctangent is researched. Theoretical analysis and numerical simulation are adopted. Theoretical analysis demonstrates that both algorithms can restrain the influence of optical intensity perturbation effectively. But the impact of higher perturbation cannot be eliminated totally, which is limited by the design of lowpass filter. Meanwhile, compared with the traditional phase generated carrier (PGC) demodulation based on arctangent, heterodyne demodulation based on arctangent has an extra advantage in eliminating the influence of the modulation depth C. Numerical simulation matches well with theoretical analysis. Experimental architecture based on heterodyne detection is constructed and demodulation experiment is implemented. The results of experiment demonstrate that both algorithms can eliminate system noise including intensity perturbation..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 106004 (2013)
Imaging Systems
Credibility Evaluation of Infrared Imaging Simulation Based on the Analytic Hierarchy Process
Zhang Peng, Zhang Zhihui, and Han Shunli
The infrared imaging simulation credibility evaluation model is proposed based on the decision making thought of analytic hierarchy process. The index system to evaluate the infrared imaging simulation credibility is established. The indexes′ credibility is obtained by applying the statistic analysis or expert′s gradedThe infrared imaging simulation credibility evaluation model is proposed based on the decision making thought of analytic hierarchy process. The index system to evaluate the infrared imaging simulation credibility is established. The indexes′ credibility is obtained by applying the statistic analysis or expert′s graded approach. The sum and product method is used to calculate the credibility evaluation factors′ weight. Then the objective quantitative credibility of infrared imaging simulation is gained by considering all credibility evaluation factors comprehensively. The results of research and theory analyzing demonstrate that the proposed method can evaluate the credibility of infrared imaging simulation, and the evaluation result is well consistent with actual infrared image. Theory analysis and the evaluation result of credibility shows the method is reasonable and efficient, and the scientific decision basis is afforded to the simulation users..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 111001 (2013)
Instrumentation, Measurement and Metrology
Study of Calibration Method of Radial Shearing Interferometry
Zhang Chen, Liu Chunling, Li Dahai, Li Mengyang, and Wang Qionghua
Radial shearing interferometry has been widely used to test distorted wavefront. However, the result of wavefront measurement by using this technique includes two parts, one is the real phase information of wavefront under test and the other is the system errors in radial shearing interferometer. A calibration method oRadial shearing interferometry has been widely used to test distorted wavefront. However, the result of wavefront measurement by using this technique includes two parts, one is the real phase information of wavefront under test and the other is the system errors in radial shearing interferometer. A calibration method of a radial shearing interferometer is presented. First of all, several fringe patterns of the phase difference distribution are obtained by a tested component with different positions. Then, the maximum likelihood method is used to combine the phase difference data and create a maximum likelihood function. After that, the wavefront under test and system errors can be separated. The simulation results show that the maximum likelihood method can deal with the issue of the calibration of a radial shearing interferometer. Furthermore, the method is used to reduce the effect of the system errors on extracting and reconstructing the wavefront under test..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 112001 (2013)
Laser Dual-Triangulation for Groove Profile
Liu Hengbiao, Liu Chenglin, and Ge Jianmin
Laser triangulation system with single imaging lens is not suitable for measuring the groove profile. Diffuse reflected light of illumination point on object surface is blocked by steep groove edges and a measurement blind zone is formed, because the projection axis and the imaging axis are in a certain angle. To solveLaser triangulation system with single imaging lens is not suitable for measuring the groove profile. Diffuse reflected light of illumination point on object surface is blocked by steep groove edges and a measurement blind zone is formed, because the projection axis and the imaging axis are in a certain angle. To solve this problem, a laser dual-triangulation system based on the laser triangulation method with Scheimpflug condition is developed for groove profile measurement. The autoregulation of integral time of image spot detector and the digital filtering of image intensity data are discussed. Extraction of image spot center and discriminance of imaging point due to imaging beam shaded by groove edge are also studied. The dual-triangulation mapping relationship is determined by calibration experiment. The compressive deformation measurement of tread profile indicates the validity of this system and the measurable depth-to-width ratio of the groove profile is more than or equal to 5 mm..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 112006 (2013)
Lasers and Laser Optics
Lifetime Test of 808 nm High Power Laser Diodes
Lu Guoguang, Lei Zhifeng, Huang Yun, and En Yunfei
In order to obtain the lifetime index of the single-bar 808 nm high power semicondutor laser, an on-line monitoring system under ten workspaces is set up. Subsequent lifetime tests are completed. The conditions of these tests are 25 ℃,100 A, 50 ℃,100 A and 50 ℃, 115 A, respectively. According to the linear regression aIn order to obtain the lifetime index of the single-bar 808 nm high power semicondutor laser, an on-line monitoring system under ten workspaces is set up. Subsequent lifetime tests are completed. The conditions of these tests are 25 ℃,100 A, 50 ℃,100 A and 50 ℃, 115 A, respectively. According to the linear regression analysis, the method of least squares, goodness-of-fit test and other statistical knowledge, the power degradation model is obtained. Based on this degradation model the extrapolated lifetime of cm-bars at 25 ℃ is 2.86×109 shots. This lifetime extrapolative method based on the parameter degradation model has some advantages such as short experiment time and high veracity than other traditional accelerated aging test methods..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 114003 (2013)
High-Power 532 nm Kilohertz Picosecond Laser Amplifier
Wang Qing, Wei Zhiyi, Shen Zhongwei, Wang Zhaohua, Yang Junhong, and Ma Yunfeng
We demonstrate a 532 nm and 1 kHz picosecond laser amplifier which is made up of one home-made picosecond oscillator seed, a regenerative amplifier, two-pass amplifier, a main amplifier, and a frequency doubler. The green laser has a beam quality factor of 1.39 and 1.96 for tangential direction and sagittal direction, We demonstrate a 532 nm and 1 kHz picosecond laser amplifier which is made up of one home-made picosecond oscillator seed, a regenerative amplifier, two-pass amplifier, a main amplifier, and a frequency doubler. The green laser has a beam quality factor of 1.39 and 1.96 for tangential direction and sagittal direction, respectively, and the long-term stability root mean square (RMS) is less than 0.3%..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 114004 (2013)
Phase Singularities of Anomalous Hollow Beams′ Electric and Magnetic Field Focused by a High Numerical Aperture Objective
Chen Shuqiong, Luo Yamei, and Tang Bihua
Based on the vectorial Debye diffraction theory and taking linearly polarized anomalous hollow beam as an example, the phase singularities in the focal region are studied. It is found that electric and magnetic phase singularities depend on the truncation parameter and numerical aperture. By varying the truncation paraBased on the vectorial Debye diffraction theory and taking linearly polarized anomalous hollow beam as an example, the phase singularities in the focal region are studied. It is found that electric and magnetic phase singularities depend on the truncation parameter and numerical aperture. By varying the truncation parameter, the motion, creation and annihilation of phase singularities of electric and magnetic field take place in the focal region. By companying phase singularities, a pair of saddle points may appear and behave similarly. A pair of saddle points and the corresponding pair of phase singularities approach, and then annihilate each other, which leads to the subwavelength structure. However, the singularities annihilate behind saddle points. There exists the different critical point of truncation parameter, where the creation or annihilation occurs at the same numerical aperture. The results are illustrated and compared by numerical examples..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 114005 (2013)
Research of Smoothing by Spectral Dispersion When Using One Grating
Zhou Yuliang, Siu Zhan, Liu Lanqin, Su Jingqin, Xu Lixin, Wang Wenyi, Huang Wanqing, and Zhang Ying
Smoothing by spectral dispersion (SSD) technology has been widely used for many high-power laser drivers. However, due to the engineering design reasons, national ignition facility (NIF) and technical integration experiment line (TIL) use only one grating. It will affect the smoothing efficiency, especially at the begiSmoothing by spectral dispersion (SSD) technology has been widely used for many high-power laser drivers. However, due to the engineering design reasons, national ignition facility (NIF) and technical integration experiment line (TIL) use only one grating. It will affect the smoothing efficiency, especially at the beginning time. But we can reduce it by the way of optimizing the modulation frequency. Finally we analyse the SSD technology with one grating and provide a theoretical basis for the optimization of high-power laser drivers..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 114007 (2013)
Propagation Performance of Incoherent Combined Beams of Fiber Lasers in Atmospheric Turbulence
Wu Wuming, Guo Shaofeng, Tao Rumao, Wu Yi, and Ning Yu
The theoretical model of high-power fiber incoherent combined beams propagating in atmospheric turbulence is established, including single mode laser and multi-mode laser. The influences of collimating system, mechanical jitter and atmospheric turbulence are considered. The results show that the beam quality′s degeneraThe theoretical model of high-power fiber incoherent combined beams propagating in atmospheric turbulence is established, including single mode laser and multi-mode laser. The influences of collimating system, mechanical jitter and atmospheric turbulence are considered. The results show that the beam quality′s degeneration ratio of 10 kW single mode fiber laser is 10% resulting from the collimating system. And the ratio of 30 kW multi-mode fiber laser is 1%. For six incoherent combined beams without tip-tilt correction, the advantage in propagation performance of single mode beam decreases with the increase of the intensity of turbulence when the propagation distance is longer than 5 km. The maximum intensity gain due to tip-tilt correction of single mode beams is 1.32 times than without tip-tilt correction when the propagation distance is 5~15 km, while the gain of multi-mode beams is not obvious..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 114008 (2013)
Experiment of Laser Shock Strengthening Tungsten Inert-Gas Welded AZ31B Magnesium Alloy
Xiang Jianyun, Ge Maozhong, and Zhang Yongkang
In order to study the effect of laser shock processing (LSP) on mechanical properties of welded magnesium alloy, tungsten inert-gas (TIG) welded AZ31B magnesium alloy sheets are processed using NdYAG laser with wavelength of 1064 nm, pulse width of 15 ns, pulse energy of 4 J and spot diameter of 3 mm. The microstructurIn order to study the effect of laser shock processing (LSP) on mechanical properties of welded magnesium alloy, tungsten inert-gas (TIG) welded AZ31B magnesium alloy sheets are processed using NdYAG laser with wavelength of 1064 nm, pulse width of 15 ns, pulse energy of 4 J and spot diameter of 3 mm. The microstructures of welded joint are examined through optical microscope (OM) before LSP. The microstructures of welded joint surface layer of sample are characterized by transmisstion electron microscope (TEM) and X-ray diffractometer (XRD) after LSP, and fracture surfaces are analyzed by scanning electron microscope (SEM). The mechanism which causes the mechanical properties improvement is discussed. The results show that nanocrystalline can be produced on the surface layer of TIG welded joint by using optimized laser parameters, and nano grain size is about 35 nm. The surface residual stress of heat affected zone is converted from tensile stress (60 MPa) to compressive stress (-125 MPa) by LSP. Tensile strength and yield strength are improved by 15.2% and 15.7%, respectively, and surface micro-hardness is enhanced by 78.2%. Furthermore, the mean impact energy of samples is increased by 58.8% after LSP. The mechanical properties improvement is attributed to a combination effect of surface nanocrystallization, strain hardness and residual compressive stress..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 114015 (2013)
Experimental Study on Fiber-Coupled Laser Shock Peening
An Zhongwei, Zhou Jianzhong, Huang Shu, Chen Mingyang, Zhu Xinglong, Meng Xiankai, and Feng Aixin
In order to broaden the industrial application range of laser shock peening (LSP), a system with 10 MW laser pulses delivered by a standard 1000 μm multi mode optical fiber is developed. The system is composed by three units, laser coupling unit, laser delivery unit and laser collimation unit. First of all, N-ON-1 methIn order to broaden the industrial application range of laser shock peening (LSP), a system with 10 MW laser pulses delivered by a standard 1000 μm multi mode optical fiber is developed. The system is composed by three units, laser coupling unit, laser delivery unit and laser collimation unit. First of all, N-ON-1 method is selected to measure optical fiber damage threshold and laser pulse energy is determined accordingly. Then, fiber-coupled LSP is carried out on 6061-T6 aluminum alloy sheet metal, and two spot layout schemes are studied to obtain the optimum residual stress. Residual stress is measured by X-ray diffraction method. The largest residual stress induced by LSP on the surface of sample is -160.55 MPa. This system can provide some strong theoretical basis for the flexible manufacture of laser shock technology..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 114016 (2013)
Application of a Central Composite Design for Experimental Research on Laser Transmission Joining Process of FRPA
Jiang Tao, Liu Huixia, Li Pin, Yan Zhang, Xue Guochun, Gao Yangyang, and Wang Xiao
Laser transmission joining of fiber reinforced polyamides (FRPA) has potential application in industry. Based on a central composite rotatable design, comprehensive experiments of laser transmission joining of FRPA are carried out by a diode continuous laser source. The microscopic cross-section observation shows that Laser transmission joining of fiber reinforced polyamides (FRPA) has potential application in industry. Based on a central composite rotatable design, comprehensive experiments of laser transmission joining of FRPA are carried out by a diode continuous laser source. The microscopic cross-section observation shows that the joining area is good. The effect of process parameters on the joint quality is analyzed by processing of the experimental data. Finally, mathematical models between the process parameters, the lap-shear strength and the joint width are determined by response surface methodology. The results show that the process parameters of laser transmission welding play a significant role in determining the joint quality; and the predicted data of the models are in good agreement with the experimental results. So this study could provide an effective instruction to choose the reasonable process parameters for enhancing the joining efficiency..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 114017 (2013)
Materials
Near-Infrared Luminescence Characteristics at 1.3 μm Range of Narrow Band-Gap Phthalocyanines Thin Film
Hou Xiaoke, Yao Yong, Du Xiguang, Ma Chunyu, Zhang Shengli, and Yang Yatao
The optical activities of organic compounds are dertermined by their energy band gaps. By extending the conjugated system of phthalocyanine molecule and adding peripheral electrophilic subunits, near-infrared emitting of organic molecule materials is realized. A new aza phthalocyanine containing four 1,10-phenanthrolinThe optical activities of organic compounds are dertermined by their energy band gaps. By extending the conjugated system of phthalocyanine molecule and adding peripheral electrophilic subunits, near-infrared emitting of organic molecule materials is realized. A new aza phthalocyanine containing four 1,10-phenanthroline subunits is synthesized and thin-film samples are prepared. The maximum absorption wavelength reaches beyond 1 μm. The photoluminescence (PL) spectra show emission wavelength is at the range of 1.3 μm, which is one of the important optical communication wavelengths. The cyclic voltammetry measurement is performed. The energy band-gap is determined to be 1.1 eV. The narrow band-gap further verifies its near-infrared optical activity. This paper provides some experimental data for developing organic NIR materials..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 116001 (2013)
Mechanism for 1 μm Photoluminescence in Yb3+/Li+ Codoped Y2O3 Nanoparticles
Fan Ting, Lü Jiantao, and Li Na
Y2O3 nanoparticles codoped with Yb3+/Li+ ions are synthesized by glycine combustion method. Codoping with 5% mole fraction of Li+ ions leads to about 12 times enhancement of the photoluminescence (PL) intensity around 1 μm under diode laser excitation of 940 nm. The movements of the X-ray main diffraction peak indicateY2O3 nanoparticles codoped with Yb3+/Li+ ions are synthesized by glycine combustion method. Codoping with 5% mole fraction of Li+ ions leads to about 12 times enhancement of the photoluminescence (PL) intensity around 1 μm under diode laser excitation of 940 nm. The movements of the X-ray main diffraction peak indicate that the codoping of Li+ ions changes the lattice environment of Yb3+ ions. Theoretical investigations based on the steady-state rate equations indicate that the PL enhancement arises mainly from the increased ground state absorption cross section of Yb3+ ions by codoping with Li+ ions. The codoping of Li+ ions can disturb the local crystal field around the Yb3+ ions in Y2O3 crystals, change the PL transition selection rules of Yb3+ ions, resulting in enhanced intra-4f electric-dipole transitions and oscillator strength, which leads to the increase of ground state absorption cross section..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 116003 (2013)
Remote Sensing and Sensors
Beijing Atmospheric Boundary Layer Observation with Lidar in 2011 Spring
Yan Baodong, Song Xiaoquan, Chen Chao, Chen Yubao, Liu Bingyi, and Liu Zhishen
From Mar. 21 to Apr. 19 in 2011, atmospheric observations with mobile Doppler wind lidar at Beijing observatory are operated by China Meteorological Administration. Atmospheric boundary layer is observed and analyzed by the gradient of lidar range-corrected signal. The processed results of lidar observation data indicaFrom Mar. 21 to Apr. 19 in 2011, atmospheric observations with mobile Doppler wind lidar at Beijing observatory are operated by China Meteorological Administration. Atmospheric boundary layer is observed and analyzed by the gradient of lidar range-corrected signal. The processed results of lidar observation data indicate that the average mixing layer or surface stable boundary layer height is (1.44±0.75) km at 800AM and (2.23±1.13) km at 800PM, the average atmospheric boundary layer height is (2.88±0.92) km at 800AM and (3.37±0.82) km at 800PM, respectively. Compared with the gradient of potential temperature and relative humidity of synchronous radiosonde, the correlation index is as much as 94%, which shows good consistency with lidar..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 128001 (2013)
Research on Modulation Performance of the “Seed Laser” in Emission Source of FM-CW Ladar
Xiong Zhipeng, Li Qi, and Wang Qi
Frequency-modulation continuous-wave (FM-CW) ladar is a new kind optical incoherent ladar. In its emission source, how to get a broadband modulated high-power continuous laser emission is the key technology. Two kinds of “seed laser” source, CQF935/5624 and EM650, are studied respectively. The performance of the relateFrequency-modulation continuous-wave (FM-CW) ladar is a new kind optical incoherent ladar. In its emission source, how to get a broadband modulated high-power continuous laser emission is the key technology. Two kinds of “seed laser” source, CQF935/5624 and EM650, are studied respectively. The performance of the related devices is tested and the results are given. The modulation performance is researched by conducting a series of experiments. The influence of the nonlinear factor on the modulation performance is discussed. The experimental results indicate that both the two “seed laser” sources have a good modulation performance, which can lead to a further application in the future. EM650 has more advantages for its integration..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 128003 (2013)
Spectroscopy
Study on Sensitivity of Microalgal Stressed by Heavy Metals Based on Chlorophyll Fluorescence
Duan Jingbo, Liu Wenqing, Zhang Yujun, Zhao Nanjing, Wang Zhigang, Yin Gaofang, Liu Jing, and Fang Li
The inhibitions of scenedesmus obliquus, chlorella pyrenoidosa and chlorella vulgaris stressed by the same concentration of Hg2+, Cd2+, Cu2+, Zn2+ are investigated with pulse amplitute modulation (PAM) technology.The chlorophyll-a fluorescence parameters of PSⅡ system are measured and the inhibition rates and response The inhibitions of scenedesmus obliquus, chlorella pyrenoidosa and chlorella vulgaris stressed by the same concentration of Hg2+, Cd2+, Cu2+, Zn2+ are investigated with pulse amplitute modulation (PAM) technology.The chlorophyll-a fluorescence parameters of PSⅡ system are measured and the inhibition rates and response times of three kinds of algals offer reference for the sensitive microalgal species. From the results, chlorella pyrenoidosa is determines as a sensitive microalgal species to Hg2+, Cd2+, Cu2+, Zn2+. The sensitivity of three microalgals can be expressed as chlorella pyrenoidosa>scenedesmus obliquus>chlorella vulgaris.The toxicity results of four kinds of heavy metal ions can be expressed as Hg2+>Cu2+>Cd2+>Zn2+. Compared to algal growth inhibition experiment, this new method for a sensitive microalgal specie selection is simple and rapid..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 130001 (2013)
Dynamic Law of Microcystin Released by Microcystis Aeraginosa in Different Growth Periods
Duan Jingbo, Liu Wenqing, Zhang Yujun, Zhao Nanjing, Wang Zhigang, Yin Gaofang, Xiao Xue, and Fang Li
Microcystis aeraginosa is cultivated in BG-11 medium and nature water for 100 d. Dynamic law of microcystic toxins MC-LR released by microcystis aeraginosa in different growth phrases is studied. The results show: the chlorophyll-a concentration maximum of microcystis aeraginosa appears 10 d ealier than the MC-LR conceMicrocystis aeraginosa is cultivated in BG-11 medium and nature water for 100 d. Dynamic law of microcystic toxins MC-LR released by microcystis aeraginosa in different growth phrases is studied. The results show: the chlorophyll-a concentration maximum of microcystis aeraginosa appears 10 d ealier than the MC-LR concentration maximum, whatever algal is cultivated in BG-11 culture medium and nature water. Similar dynamic laws showe in both culture medium are that chlorophyll-a concentration and MC-LR concentration are positively corelated in the logarithmic period and negatively correlated in the stabilization period, and chlorophyll-a concentration reduces while MC-LR concentration first increases, then decreases in the decline period. This regularity maybe closely linked to the characteristics that pigment in vivo cells released into medium could catalytic MC-LR photodegradation. The linear relationship from fitting between the chlorophyll-a concentration and MC-LR concentration, of purebred microcystis aeraginosa cultivated in laboratory condition, is used to provide a basis of approximately estimating microcystic toxins MC-LR concentration by chlorophyll-a concentration of water..
Acta Optica Sinica
- Publication Date: Jan. 01, 1900
- Vol. 33, Issue s1, 130002 (2013)
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