Journals >Journal of Infrared and Millimeter Waves
Contents
2003
Volume: 22 Issue 5
15 Article(s)
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Research Article
APPROACH TO CREATION OF TARGET AND ENVIRONMENT IN INFRARED IMAGE
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Key issues about extraction of target character in creation of IR image environment is studied. It presents a multi stage data flow that consists of three level functional modules, which are adaptive background perception and subtracting operation, selection of automatic threshold used for clutter suppression, shape anKey issues about extraction of target character in creation of IR image environment is studied. It presents a multi stage data flow that consists of three level functional modules, which are adaptive background perception and subtracting operation, selection of automatic threshold used for clutter suppression, shape analyzing and target character recognition. A morphology based data processing approach proposed in this paper is applied to background estimation. Experimental results show that the method is able to provide good filtering results and robust adaptability to image environment with clutter background..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 337 (2003)
THE STUDY ON INFRARED TEXTURE SIMULATION BASED ON GLC MODEL
[in Chinese], and [in Chinese]
The random field models can be available in synthesizing the natural texture according to the statistical distribution of intensity of texture in space. With Markov property of the temperature fields distribution on the surface of objects, the Generalized Long Correlation(GLC)random fields model is applied to simulate The random field models can be available in synthesizing the natural texture according to the statistical distribution of intensity of texture in space. With Markov property of the temperature fields distribution on the surface of objects, the Generalized Long Correlation(GLC)random fields model is applied to simulate the distribution of temperature fields on the surface of natural terrains. And the radiation fields of terrain can be easily calculated by Planck′s radiation law. The infrared textures can be produced after digitalization of radiation fields by given display ruler and quality of radiation. The simulation results show that the GLC model can generate the infrared texture in bands of 3 ～5μm and 8～12μm effectively..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 341 (2003)
A 24 GHz BALANCE MIXER USING FLIP-CHIP GaAs SCHOTTKY DIODES
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A mixer employing a planar flip chip GaAs Schottky diode has been designed and tested at 24GHz. Using a planar diode eliminates the disadvantages of mechanical instability and large parasitical parameters associated with conventional whisker contacted diodes. The realized mixer provides conversion loss lower than 10dB A mixer employing a planar flip chip GaAs Schottky diode has been designed and tested at 24GHz. Using a planar diode eliminates the disadvantages of mechanical instability and large parasitical parameters associated with conventional whisker contacted diodes. The realized mixer provides conversion loss lower than 10dB and LO -to -RF isolation higher than 35dB. It is specially suitable for applications in automotive electronic system because of its simple structure and low cost..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 346 (2003)
COMPARISON OF ULTRAVIOLET PHOTOLUMINESCENCE CHARACTERISTICS BETWEEN MgZnO AND ZnO THIN FILMS
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Low temperature epitaxy of wurtzite ZnO and cubic MgZnO films is achieved on Si(111) by reactive electron beam evaporation. Mg content in MgZnO film is measured by X ray photoelectron spectroscopy and is larger than that in the evaporation source. Ultraviolet photoluminescence (UVPL) measurements show the emission peakLow temperature epitaxy of wurtzite ZnO and cubic MgZnO films is achieved on Si(111) by reactive electron beam evaporation. Mg content in MgZnO film is measured by X ray photoelectron spectroscopy and is larger than that in the evaporation source. Ultraviolet photoluminescence (UVPL) measurements show the emission peak of ZnO is at 393nm, while the peak of MaZnO is at 373nm. It is found that the UVPL peak of ZnO film grown under no O 2 environment is red shifted compared with that of ZnO film grown in the reaction chamber with additional O 2..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 349 (2003)
WEAK AND SMALL OBJECT DETECTION BASED ON WAVELET MULTI-SCALE ANALYSIS AND FISHER ALGORITHM
[in Chinese], [in Chinese], and [in Chinese]
Proposing a novel method to detect weak and small targets in infrared image sequences. Preprocess is imposed on image by use of wavelet multi scale analysis to inhibiter arbitrary background. By utilizing the improved Fisher algorithm, we then threshold the preprocessed images, and separate the targets from the backgroProposing a novel method to detect weak and small targets in infrared image sequences. Preprocess is imposed on image by use of wavelet multi scale analysis to inhibiter arbitrary background. By utilizing the improved Fisher algorithm, we then threshold the preprocessed images, and separate the targets from the background. Target’s pose estimation is obtained through computing the difference of two near frames that have been threshold. Comparing the experimental results on real IR image sequence to that of automatic threshold on class variance show its effectiveness..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 353 (2003)
SOLVING THE SEA SURFACE TEMPERATURE FROM THE INFRARED RADIATION HEAT BALANCE EQUATION
[in Chinese], [in Chinese], and [in Chinese]
In order to obtain real time input of sea surface temperature in infrared simulation of sea surface, the heat balance equation of infrared radiation at the sea surface are given, and every term in the equation, such as the solar radiation, the radiation from the sky, the self emission radiation of sea surface, heat excIn order to obtain real time input of sea surface temperature in infrared simulation of sea surface, the heat balance equation of infrared radiation at the sea surface are given, and every term in the equation, such as the solar radiation, the radiation from the sky, the self emission radiation of sea surface, heat exchange between the sea surface and the atmosphere are expressed as a function of temperature, then the sea surface temperature is calculated by solving the equation. Finally the changes of sea surface temperature along with the variation of solar radiation, radiation from the sky, wind speed, and relative humidity are simulated, which shows that the model is correct and reliable..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 357 (2003)
RAMAN AND FT-IR SPECTRA OF FERROELECDTRIC POTASSIUM LITHIUM NIOBATE CRYSTAL
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Ferroelectric potassium lithium niobate crystals have been grown by using czochralski technique. The molecular formula of the crystal has been determined based on the Philips PW2400 X ray fluorescent spectra. Homogeneous and crack free samples about 6×6×7(a×b×c) were used to study the lattice vibratFerroelectric potassium lithium niobate crystals have been grown by using czochralski technique. The molecular formula of the crystal has been determined based on the Philips PW2400 X ray fluorescent spectra. Homogeneous and crack free samples about 6×6×7(a×b×c) were used to study the lattice vibration spectra using Raman and Infrared reflectivity spectroscopy. Compare with the lattice vibration spectra of other tungsten bronze (TB) type crystals, the symmetric bend vibration mode v 5 was split into three Raman lines, and the antisymmetric stretch vibration mode v 3 and antisymmetric bend vibration mode v 4 were all broadened greatly. This shows that Li ions in the C sites in the potassium lithium niobate crystal do influence on the Raman and inferred reflectivity spectra of [NbO 6] 7- octahedron greatly..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 361 (2003)
STUDY FOR MODULATION TRANSFER FUNCTION OF INFRARED FOCAL PLANE ARRAY
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The factors affecting the modulation transfer function(MTF) of infrared focal plane arrays are analyzed in the paper, and a model of imaging transfer for infrared focal plane arrays is constructed. On the basis of the model, the paper also discusses the method measuring MTF of infrared focal plane arrays.The factors affecting the modulation transfer function(MTF) of infrared focal plane arrays are analyzed in the paper, and a model of imaging transfer for infrared focal plane arrays is constructed. On the basis of the model, the paper also discusses the method measuring MTF of infrared focal plane arrays..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 365 (2003)
A FAST ALGORITHM OF EARTH-EDGE DETECTION FOR SPACE REMOTE SENSING IMAGES UNDER STRONG NOISES
[in Chinese], and [in Chinese]
A new fast algorithm of the edge detection for the images——the Markov prediction model is presented, which predicts the positions of the edge points. Based on the merits of the target’s edge, the LMS classifier is used to correct the predicted outputs at the same time. Comparing with the traditional method, the algoritA new fast algorithm of the edge detection for the images——the Markov prediction model is presented, which predicts the positions of the edge points. Based on the merits of the target’s edge, the LMS classifier is used to correct the predicted outputs at the same time. Comparing with the traditional method, the algorithm has a stronger ability of restraining noise and real time processing. The experimental results show that the algorithm has a better detection to any zone of nonmutation and closed. It has been applied to the real time acquisition and processing system for the space remote sensing successfully..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 368 (2003)
A FIELD MEASUREMENT METHOD OF SPECTRAL EMISSIVITY AND RESEARCH ON THE FEATURE OF SOIL THERMAL INFRARED EMISSIVITY
[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
An experiment method is suggested to measure the surface spectral emissivity in field based on iterative spectrally smoth temperature emissvity separation(ISSTES) algorithm. A deliberately designed experiment is carried out to study the relationship of the spectral emissivity of soil with different grain size, differenAn experiment method is suggested to measure the surface spectral emissivity in field based on iterative spectrally smoth temperature emissvity separation(ISSTES) algorithm. A deliberately designed experiment is carried out to study the relationship of the spectral emissivity of soil with different grain size, different sand and water content. The results show that emissvities become lower when sand content increase and higher when water content increase in 8～9.5μm region; In 11～13μm region, the variance of emissivity is not obvious. Accordingly, a method is suggested for retrieving sand content and water content of soil with multispectral thermal infrared observation..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 373 (2003)
THE STUDY OF METHODS FOR MEASURING TISSUE OXYGENATION BY USING NIRS
[in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Based on the model of multilayered biological tissue, a method to measure tissue oxygenation saturation by using noninvasive near infrared spectroscopy was present. For the subjects with different constructions and scales of their overlaying tissue, the correction method which make results reliable and comparable in seBased on the model of multilayered biological tissue, a method to measure tissue oxygenation saturation by using noninvasive near infrared spectroscopy was present. For the subjects with different constructions and scales of their overlaying tissue, the correction method which make results reliable and comparable in semi quantitative measuring change in tissue blood oxygenation was proposed. A new compact monitoring instrument which includes a probe with a dual wavelength LED and two integrated optical detectors at different distance from light source was designed and developed. During the ischaemia of forearm induced by 240mmHg pressure with inflating cuff, the result of concentration changes in oxyhemoglobin, deoxyhemoglobin and the value of tSO 2 is consistent with the foreign reports by TRS methods. It shows that the monitoring system is very stable and feasible..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 379 (2003)
CHARACTERISTICS OF PSD233 POSITION SENSITIVE DETECTOR AND ITS APPLICATION IN ATOMIC FORCE MICROSCOPE
[in Chinese], [in Chinese], and [in Chinese]
The spectral response of 3mm×3mm position sensitive detector (PSD) covering a wide spectral range from 320nm to 1150nm. The beam deflection method was employed to determine the temporal response and position sensitive properties of the PSD. As an application of the PSD, we developed a horizontal atomic force microThe spectral response of 3mm×3mm position sensitive detector (PSD) covering a wide spectral range from 320nm to 1150nm. The beam deflection method was employed to determine the temporal response and position sensitive properties of the PSD. As an application of the PSD, we developed a horizontal atomic force microscope(AFM), introduced the basic concept and controlling system of the AFM, and presented some sample images scanned by the AFM. The results show that the horizontal AFM is an effcient system for image acquisition, which has an excellent repeatability, reliable stability and ideal image contrast. The maximum scan range is up to 5μm×5μm, and the resolution of the AFM is at the nanometer scale. It is obvious that the new PSD is of outstanding characteristics of spectral response, temporal response and position sensitive property..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 384 (2003)
DESIGN AND FABRICATION OF 8mm INTEGRATED FLIP-CHIP RING MIXER
[in Chinese], [in Chinese], and [in Chinese]
mm integrated flip chip ring mixer circuit is designed and simulated with HP ADS software. The simulated three ports isolation is nicer when RF is 35.1GHz and local frequency is 35GHz. Simulated the best LO power is 6～15dBm with computer, conversion loss is less than 5dB. 8mm integrated flip chip ring mixer with chip smm integrated flip chip ring mixer circuit is designed and simulated with HP ADS software. The simulated three ports isolation is nicer when RF is 35.1GHz and local frequency is 35GHz. Simulated the best LO power is 6～15dBm with computer, conversion loss is less than 5dB. 8mm integrated flip chip ring mixer with chip size 3×3.75μm 2 is fabricated. Measured results are almost consistent with simulated results..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 389 (2003)
STUDY OF MODELING SPECTRAL EMISSIVITY OF LOW TEMPERATURE TARGET AND WEAK SIGNAL DETECTION
[in Chinese], [in Chinese], [in Chinese], and [in Chinese]
By using the technique of wavelet transform for pretreatment and flitting the weak radiation signal has been accurately detected. Moreover, a new method for modeling the emissivity and wavelength of a multiwavelength pyrometer has been proposed and developed for obtaining accurately spectral emissivity and wavelength. By using the technique of wavelet transform for pretreatment and flitting the weak radiation signal has been accurately detected. Moreover, a new method for modeling the emissivity and wavelength of a multiwavelength pyrometer has been proposed and developed for obtaining accurately spectral emissivity and wavelength. In this method, it was unnecessary to give sample data of fixed emissivity model. Then, the detailed aglorithem was described and the simulation was done for checking the validity of algorithm..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 393 (2003)
ANALYSIS OF WAVEGUIDE LOADED WITH DIELECTRIC USED AS MILLIMETER WAVE FOCAL IMAGING ARRAY ELEMENTS
[in Chinese], and [in Chinese]
Waveguide loaded with dielectric, which is used as focal plane array element in millimeter wave imaging, was analyzed. Input properties of the element were analyzed and optimized for matching between feed waveguide and radiation element by finite difference time domain (FDTD) method. The coupling efficiency of radiatioWaveguide loaded with dielectric, which is used as focal plane array element in millimeter wave imaging, was analyzed. Input properties of the element were analyzed and optimized for matching between feed waveguide and radiation element by finite difference time domain (FDTD) method. The coupling efficiency of radiation waveguide and the Airy′ pattern from imaging lens was calculated, and compared with that of other array elements..
Journal of Infrared and Millimeter Waves
- Publication Date: Oct. 01, 2003
- Vol. 22, Issue 5, 398 (2003)
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