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Journal of Infrared and Millimeter Waves
Contents
2020
Volume: 39 Issue 5
17 Article(s)
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Image Processing and Software Simulation
Maritime background infrared imagery classification based on histogram of oriented gradient and local contrast features
Li-Li DONG, Tong ZHANG, Dong-Dong MA, and Wen-Hai XU
In the complex and changeable sea environment, when using infrared imaging technology to search and rescue small and medium targets on the sea surface, it is necessary to classify the collected original images in order to facilitate the subsequent target processing in different scenes. According to different environmen
In the complex and changeable sea environment, when using infrared imaging technology to search and rescue small and medium targets on the sea surface, it is necessary to classify the collected original images in order to facilitate the subsequent target processing in different scenes. According to different environmental conditions, the sea infrared images are divided into five kinds of scenes. The training set images are extracted from two aspects: one is to divide an image into basic layer and detail layer by the Gaussian filter, and use improved histogram of oriented gradient (HOG) method to extract the features; the other is to extract features by calculating local contrast of images. The extracted feature vectors are fused and input into the classifier, and the test set images are classified by support vector machine (SVM). In this paper, a new feature descriptor combined with HOG and local contrast method (LCM) is used to classify the scene of sea infrared image. Compared with other methods, the results show that the accuracy of the improved method is 96.4%, which reflects the feasibility and effectiveness..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 650 (2020)
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Combining-SNCR evaluation of dual-models aerial targets’ infrared bands
Lei ZHANG, Lue CHEN, Han-Lu ZHU, and Peng RAO
The detection of the aerial targets applied on the space-based platform has disadvantages of long distance, weak signal of targets, complex background clutters and detector noises. Therefore, to obtain the strongest signal of the target, it is crucial to determine the bands used during the process of detection. The tra
The detection of the aerial targets applied on the space-based platform has disadvantages of long distance, weak signal of targets, complex background clutters and detector noises. Therefore, to obtain the strongest signal of the target, it is crucial to determine the bands used during the process of detection. The trapezoidal plume and the cone plume simulation model are systematically established, meanwhile an SNCR method combining the signal to noisy ratio(SNR) and the signal to clutter ratio(SCR) is proposed to determine the detection bands. The experimental result shows that, different aerial targets have different SNCR values, but with the same peak value. According to the method mentioned above, bands have been determined and eventually the values are as follows:
3.7
~
4.15
μ
m
in MWIR band in which interval is not less than 0.3
μ
m
,
8
~
12
μ
m
in LWIR band in which interval is not less than 0.3
μ
m
..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 660 (2020)
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Infrared Spectroscopy and Spectral Analysis
Cathodoluminescence(CL) analysis of ZnSe crystal from 350 nm to 850nm at room temperature
Reng WANG, Cui-Ling JIAO, Ye LU, Qin HUO, Hui QIAO, and Xiang-Yang LI
As-received ZnSe crystal has been examined by cathodoluminescence spectroscopy ranging from 350nm to 850nm at room temperature for internal defects and inclusions. Two cathodoluminescence peaks of 462nm and 453nm were detected,of which the former was identified as intrinsic cathodoluminescence of ZnSe and the latter wa
As-received ZnSe crystal has been examined by cathodoluminescence spectroscopy ranging from 350nm to 850nm at room temperature for internal defects and inclusions. Two cathodoluminescence peaks of 462nm and 453nm were detected,of which the former was identified as intrinsic cathodoluminescence of ZnSe and the latter was caused by the crystal defect. The Zn:Se ratio of 6:4 was found by energy dispersive x-ray spectroscopy(EDS),and the extrinsic cathodoluminescence peak of 453nm was attributed to additional Zn in excess of ZnSe stoichiometry..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 601 (2020)
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Experimental study on long-distance transmission of high-power laser over single-mode fiber
Hua-Long YU, and Hai-Zhong XUE
Stimulated Raman Scattering (SRS) effect is a key factor restricting the application of high power laser transmission over single mode fiber in long distance . Using 1550nm unpolarized continuous wave single-mode fiber laser as light source, stimulated Raman scattering phenomenon generated by 103km single-mode fiber tr
Stimulated Raman Scattering (SRS) effect is a key factor restricting the application of high power laser transmission over single mode fiber in long distance . Using 1550nm unpolarized continuous wave single-mode fiber laser as light source, stimulated Raman scattering phenomenon generated by 103km single-mode fiber transmission under different injected light power conditions is experimentally studied. Cascaded long-period fiber gratings are used to carry out stimulated Raman scattering suppression experiments, and corresponding theoretical analysis is carried out. A criterion for the effectiveness of fiber stimulated Raman scattering suppression is proposed. Experiments demonstrate the stimulated Raman scattering phenomenon and verify the effectiveness of cascaded long-period fiber gratings for the suppression of stimulated Raman scattering..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 605 (2020)
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Design of 3.66 μm laser heterodyne spectrometer and retrieval of water vapor column concentration
Jun HUANG, Yin-Bo HUANG, Xing-Ji LU, Zhen-Song CAO, Tu TAN, and Dan-Dan LIU
Laser heterodyne spectroscopy has been widely used in greenhouse gas detection and laser atmospheric transmission in recent years, because of its high spectral resolution, simple structure and low cost. A laser heterodyne spectrum detection system using 3.66 μm DFB laser as local oscillator source was designed. The rea
Laser heterodyne spectroscopy has been widely used in greenhouse gas detection and laser atmospheric transmission in recent years, because of its high spectral resolution, simple structure and low cost. A laser heterodyne spectrum detection system using 3.66 μm DFB laser as local oscillator source was designed. The real-time and accurate measurements of water vapor absorption spectrum in the whole atmosphere was also realized. Furthermore, the signal-to-noise ratio after 12 averaging is 160.4, and the spectral resolution is 0.009 cm
-1
. The average values of water vapor column concentration of Hefei on May 22 and 23 are 1549 ppmv and 1730 ppmv respectively. By comparing and analyzing the measurement results of laser heterodyne spectrometer and Fourier transform spectrometer (EM27/SUN), the correlation between them is 0.895 and 0.819, and the deviation is 14.2% and 11.2% respectively. With the design and research of the system, the real-time measurements of the solar absorption spectrum of water vapor in the atmosphere and the precise inversions of water vapor column density were realized, which laid a foundation for more accurate detection and concentration inversion of the absorption spectrum of water vapor and its isotope HDO..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 610 (2020)
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Materials and Devices
Realization of a multiband metamaterial waveguide based on dirac semimetal in the 800~1100nm range
Min ZHONG, and Xian-Chun SHI
In this paper, a metamaterial waveguide with four square hole resonators based on Dirac semimetal layers is proposed in the 800~1100nm range. Four transmission peaks (70%, 61%, 72%, and 63%) are achieved at resonance wavelengths 842nm, 921nm, 1010nm, and 1061nm, respectively. These transmission peaks are originated fro
In this paper, a metamaterial waveguide with four square hole resonators based on Dirac semimetal layers is proposed in the 800~1100nm range. Four transmission peaks (70%, 61%, 72%, and 63%) are achieved at resonance wavelengths 842nm, 921nm, 1010nm, and 1061nm, respectively. These transmission peaks are originated from the interference effect of magnetic fields distributed in the main cavity and cavities 1, 2, 3, or 4. These transmission peaks can be enhanced and moved to shorter wavelengths through increasing the Fermi energy. The proposed metamaterial waveguide can be applied in nanoscale filter, switch, or refractive index sensor..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 576 (2020)
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Research progress of room temperature semiconductor infrared photodetectors
Tian XIE, Xin-Hui YE, Hui XIA, Ju-Zhu LI, Shuai-Jun ZHANG, Xin-Yang JIANG, Wei-Jie DENG, Wen-Jing WANG, Yu-Ying LI, Wei-Wei LIU, Xiang LI, and Tian-Xin LI
Room temperature operation of infrared photon detectors will open up a wider range of applications. This article summarizes the room temperature performance and dark current mechanism of semiconductor devices from near infrared to long wavelength infrared. Different methods to suppress dark current including the design
Room temperature operation of infrared photon detectors will open up a wider range of applications. This article summarizes the room temperature performance and dark current mechanism of semiconductor devices from near infrared to long wavelength infrared. Different methods to suppress dark current including the design of the interband cascade structure of InAs/GaSb type Ⅱ superlattices and the nonequilibrium operation mode of HgCdTe to suppress the Auger process show unique advantages. These electronic structural designs, combined with the latest progress in subwavelength photonic structures to enhance light coupling and reduce dark current, hold the promise to achieve a high performance infrared imaging chip operating in room temperature in the near future..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 583 (2020)
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The effect of deposition methods on the contact properties between Au/Cd electrodes and (111) CdZnTe wafers
Hao-Zhi SHI, Ji-Jun ZHANG, Shu-Lei WANG, Zhen-Hui WANG, Cheng-Yang MU, Ming-Yan XUE, Meng CAO, Jian HUANG, Ling-Jun WANG, and Yi-Ben XIA
CdZnTe wafer is an ideal substrate for HgCdTe epitaxial thin films. In order to optimize the electrical contact performance of CdZnTe substrate, the Au/Cd composite electrode was prepared on p-type (111)B CdZnTe wafer (tellurium-rich surface) by vacuum evaporation and magnetron sputtering respectively. By means of cont
CdZnTe wafer is an ideal substrate for HgCdTe epitaxial thin films. In order to optimize the electrical contact performance of CdZnTe substrate, the Au/Cd composite electrode was prepared on p-type (111)B CdZnTe wafer (tellurium-rich surface) by vacuum evaporation and magnetron sputtering respectively. By means of contact adhesion test, the adhesion between Au/Cd electrode and CdZnTe substrate was studied. Rutherford Backscattering Spectrometry (RBS) was used to compare the element depth distribution of samples with different deposition methods. The effects of the two preparation processes on the ohmic contact characteristics of Au/Cd composite electrode and CdZnTe substrate were compared through the current-voltage (
I
-
V
) test, and the optimum preparation technology of composite electrode was obtained..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 595 (2020)
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Millimeter Wave and Terahertz Technology
Graphene/GaAs heterostructure based Millimeter/Terahertz wave photodetector
Kai-Qi XU, Huang XU, Jia-Zhen ZHANG, Xiang-Dong WU, Lu-Han YANG, Jie ZHOU, Fang-Ting LIN, Lin WANG, and Gang CHEN
The low intrinsic absorption and the existence of the inherent defects hamper the monoatomic layer graphene from being a high-performance photoelectric material, which leads to the strategy to form heterostructure by combining graphene with semiconductor materials. In this work, a graphene/GaAs heterostructure based ph
The low intrinsic absorption and the existence of the inherent defects hamper the monoatomic layer graphene from being a high-performance photoelectric material, which leads to the strategy to form heterostructure by combining graphene with semiconductor materials. In this work, a graphene/GaAs heterostructure based photodetector has been designed and fabricated, in which the two-dimensional electron gas are enhanced to improve the photoresponse ability at the band of sub-millimeter and Terahertz (THz) wave ranging from 20 GHz to 0.12 THz. Under 25 GHz radiation, the responsivity of photodetector at room temperature (RT) reaches 20.6
V?W
-1
, with the response time of 9.8 μs and the noise equivalent power (NEP) of 3.2×10
10
W?Hz
-1/2
under a bias of 400 mV. At 0.12 THz, the responsivity is determined to be 4.6 V?W
-1
, with the response time of 10 μs. And a NEP of 1.4×10
-9
W?Hz
-1/2
can be achieved under the bias of 400 mV. These results exhibit great application potential for the graphene/GaAs heterostructure based THz photodetectors..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 533 (2020)
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A wideband terahertz planar Schottky diode fourth-harmonic mixer with low LO power requirement
Yi-Lin YANG, Bo ZHANG, Dong-Feng JI, Yi-Wei WANG, Xiang-Yang ZHAO, and Yong FAN
A wideband terahertz fourth-harmonic mixer with low local oscillator (LO) power requirement based on anti-parallel planar Schottky diodes is proposed. In order to realize best performances of the mixer, the relations between the parasitic elements of Schottky diodes and the mixer’s performances are analyzed. The main p
A wideband terahertz fourth-harmonic mixer with low local oscillator (LO) power requirement based on anti-parallel planar Schottky diodes is proposed. In order to realize best performances of the mixer, the relations between the parasitic elements of Schottky diodes and the mixer’s performances are analyzed. The main parameters of Schottky diodes are optimized to reduce the optimum LO power of the fourth-harmonic mixer. Measured results show that the conversion loss of the proposed mixer based on specialized diodes is 14.2 ~ 20 dB within a wide band from 340 to 490 GHz with optimal LO power of 7 mW, while the noise temperature is 4020~ 17100 K in this frequency range..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 540 (2020)
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Detailed investigations on double confocal waveguide for a gyro-TWT
Chen ZHANG, Wei WANG, Tao SONG, Jie HUANG, Yi-Chao CAO, Di-Wei LIU, Min HU, Kai-Chun ZHANG, Zhen-Hua WU, [in Chinese], Ren-Bin ZHONG, Tao ZHAO, Seng GONG, and Sheng-Gang LIU
The electromagnetic characteristics of the double confocal waveguide for a gyro-TWT is investigated in details. The eigenvalue and the field distribution of two kinds of steady-state modes in a double confocal waveguide, namely the superposition mode and the ring mode, are calculated with the scalar formulation of Huyg
The electromagnetic characteristics of the double confocal waveguide for a gyro-TWT is investigated in details. The eigenvalue and the field distribution of two kinds of steady-state modes in a double confocal waveguide, namely the superposition mode and the ring mode, are calculated with the scalar formulation of Huygens’ Principle, the theoretical results agree well with those from the commercial CST software. When the anti-phase superposition mode TE
06
mode is chosen as an operating mode in a gyro-TWT, the diffractive loss of the potential parasitic modes is far greater than that of the operating mode. It means that the potential parasitic modes can be suppressed by means of its own diffractive loss in a double confocal waveguide. The mode density in a double confocal waveguide is higher than that in a single confocal waveguide, but far lower than that in a cylindrical waveguide. Compared to the single confocal waveguide, a higher beam-wave interaction efficiency can be obtained in the double confocal waveguide for a gyro-TWT, it is an appropriate choice to choose a double confocal waveguide as the beam-wave interaction structure in a gyro-TWT..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 547 (2020)
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Study of in-vivo breast cancer in a subcutaneous xenograft mouse model using terahertz imaging
Li-Min WU, Bin LIAO, De-Gang XU, Yu-Ye WANG, Mei-Lan GE, Chao-Nan ZHANG, Jia-Hua LI, Zhong-Cheng SUN, Tu-Nan CHEN, Hua FENG, and Jian-Quan YAO
Breast cancer (BC) is one of the most common diseases in women. The accurate detection for BC is very important in clinical practice. In this paper, in-vivo breast cancer in a subcutaneous xenograft mouse was studied with the continuous-wave terahertz (THz) reflection imaging system at 2.52THz. The high reflection regi
Breast cancer (BC) is one of the most common diseases in women. The accurate detection for BC is very important in clinical practice. In this paper,
in-vivo
breast cancer in a subcutaneous xenograft mouse was studied with the continuous-wave terahertz (THz) reflection imaging system at 2.52THz. The high reflection region in THz images of
in-vivo
subcutaneous xenograft mouse corresponded well to the tumor area in visible. The difference value of 15% between tumor and normal tissues was observed. For the gold standard, the tumor areas at different depths from the surface of skin in mouse model were obtained by hematoxylin and eosin-stained images. The tumor areas increased with the increase of depth. In contrast with THz image, it is found that the tumor area in THz image was similar to that in hematoxylin and eosin-stained images at a depth of 460μm. Therefore, the detection depth of THz wave to
in-vivo
breast cancer in subcutaneous xenograft mouse model
is about 460μm, and THz wave is expected to realize the detection of deep tumors..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 553 (2020)
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Light-control splitting ratio tunable Y-type Terahertz waves to beam splitter based on two-dimensional photonic crystal
Zong-Dan JIANG, Pei-Li LI, and Yuan-Fang ZHANG
Light-control splitting ratio tunable Y-type Terahertz waves to beam splitter based on two-dimensional photonic crystal is proposed. In this scenario, the feature that coupling with line defects and the point defects of nonlinear polymer materials which have the third-order nonlinear Kerr effect is utilized. The perfor
Light-control splitting ratio tunable Y-type Terahertz waves to beam splitter based on two-dimensional photonic crystal is proposed. In this scenario, the feature that coupling with line defects and the point defects of nonlinear polymer materials which have the third-order nonlinear Kerr effect is utilized. The performance of Terahertz waves splitter with tunable splitting ratio is studied by Plane Wave Method (PWM) and Finite-Difference Time-Domain (FDTD).The research results show that the Y-type Terahertz wave splitter with tunable splitting ratio of two output ports by changing the light intensity of the control light can be realized.This beam splitter which the transmittance reaches over 98% can achieve Terahertz waves splitting with a specific wavelength. At the same time, the additional loss is less than 0.087dB and the response time reaches the order for ps.The splitter with tunable splitting ratio will have broad application prospects in future Terahertz wave communication..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 561 (2020)
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Design and analysis of a broadband quasi-optical mode converter with a Denisov launcher
Hui-Qi BIAN, Chao-Hai DU, Shi PAN, and Pu-Kun LIU
A terahertz quasi-optical mode converter with wide bandwidth was studied and designed. The quasi-optical mode converter used Denisov launcher, which had high efficiency, and worked in TE6.2 mode. It was used to realize mode conversion in gyrotron. As the parameters of Denisov launcher were the main factors affecting th
A terahertz quasi-optical mode converter with wide bandwidth was studied and designed. The quasi-optical mode converter used Denisov launcher, which had high efficiency, and worked in TE
6.2
mode. It was used to realize mode conversion in gyrotron. As the parameters of Denisov launcher were the main factors affecting the broadband performance of quasi-optical mode converter, the optimal design of the radiator parameters could increase the bandwidth of the mode converter. Using the self-developed quasi-optical simulation program for simulation, the bandwidth of the mode converter can reach 2 GHz (center frequency 94 GHz)..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 567 (2020)
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Photoelectric Technology and Application
A response time measurement method for MEMS IR detectors
Chen-Chen ZHANG, Hai-Yang MAO, Le-Le BAI, Ji-Jun XIONG, Wei-Bing WANG, and Da-Peng CHEN
As is known, response time of a MEMS infrared (IR) detector is usually measured using a complicated measurement system consisting of a blackbody radiation source, a chopper and a water-cooling apparatus. For such a system, both blocking and hollow patterns in the chopper have certain areas, which consume a certain part
As is known, response time of a MEMS infrared (IR) detector is usually measured using a complicated measurement system consisting of a blackbody radiation source, a chopper and a water-cooling apparatus. For such a system, both blocking and hollow patterns in the chopper have certain areas, which consume a certain part of time when the chopper spins at a certain frequency. In conventional measurements of response time, however, it is difficult to exclude the time consumed by a chopper, as a result, a large error is usually introduced into the system. To address such an issue, a response time measurement system for MEMS IR detectors using a fast-pulse laser as its radiation source is proposed in this work. Such a system is able to avoid extra time parameter being introduced by equipment . For a thermopile IR detector, response time measured based on traditional method is 14.46ms, while based on the newly established system, the response time is only 3.13ms. This indicates that the new method can perfectly avoid a 300% time error introduced by the traditional method..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 619 (2020)
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Remote Sensing Technology and Application
Surface soil moisture retrieval using multi-temporal Sentinel-1 SAR data in karst rocky desertification area
Quan CHEN, Zhong-Fa ZHOU, Ling-Yu WANG, Yu-Sheng DAN, and Yun-Tao TANG
Soil moisture is the core component that links the earth's surface water cycle, energy cycle and biogeochemical cycle, and it is also the key parameter to study the ecosystem in karst rocky desertification area. The aim of this study was to retrieve the soil moisture with multi-temporal Sentinel-1 C-band SAR data a
Soil moisture is the core component that links the earth's surface water cycle, energy cycle and biogeochemical cycle, and it is also the key parameter to study the ecosystem in karst rocky desertification area. The aim of this study was to retrieve the soil moisture with multi-temporal Sentinel-1 C-band SAR data and observation equations were constructed by using the Alpha approximation model over karst rocky desertification area. The spatial and temporal variation characteristics and the error influencing factors of the soil moisture retrieval results were analyzed. It is found that the overall change trend of soil moisture in the observation period is highly consistent with the trend of rainfall change. The maximum value of soil moisture and the degree of spatial heterogeneity in karst rocky desertification area is significantly higher than those in non-rocky desertification area. The results were validated using ground measurements of one acquisition date, with root mean squared error (RMSE) value of 0.059 cm
3
/cm
3
and mean bias value of 0.026 cm
3
/cm
3
. The method of retrieval of soil moisture by Alpha approximate model is applicable to karst rocky desertification area, the mixed pixel problem caused by the surrounding complex habitat conditions of the surface soil is the main influencing factor of inversion error. These results can provide reference to obtaining soil moisture under mountain complex environment by multi-temporal observation method, and provide support for ecosystem restoration and ecological industry development in karst rocky desertification area..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 626 (2020)
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Study on surface thermal environment differentiation effect in mining intensive area through developing remote sensing assessment model
Chun-Hua HOU, Fu-Ping LI, Bao-Jie HE, Hai-Hong GU, and Wen SONG
The exploitation of mineral resources has promoted rapid economic growth, but it has also caused mining areas to have increased surface thermal flux, which has a negative impact on the ecological environment. In this study, using on Landsat satellite remote sensing images of the study area from 2000 to 2018, the radiat
The exploitation of mineral resources has promoted rapid economic growth, but it has also caused mining areas to have increased surface thermal flux, which has a negative impact on the ecological environment. In this study, using on Landsat satellite remote sensing images of the study area from 2000 to 2018, the radiative transfer equation method was used to invert Land Surface Temperature (LST). VFC in the study area was inverted based on the Normalized Difference Vegetation Index (NDVI)-Dry Fuel Index (DFI) three-component pixel model. Mixed pixels were decomposed into Photosynthetic Vegetation (PV), Non-Photosynthetic Vegetation (NPV), and Bare Soil (BS). Based on the four ecological parameters, Factional Cover of Photosynthetic Vegetation (
f
PV
), Normalized Difference Moisture Index (NDMI), Normalized Difference Built-up Index (NDBI), and Bare Soil Index (BSI), a remote sensing integrated ecological index (RSIEI) model which can comprehensively evaluate the differentiation effect of the surface thermal environment in mining intensive areas is proposed using Principal Component Analysis (PCA). The relationship between the differentiation effect of the surface thermal environment and the quality of the ecological environment was studied using the heat island variation index. The results showed that the NDVI-DFI feature space of the study area conforms to the basic assumption of the three-component pixel model. And the four ecological parameters are closely related to the differentiation effect of the surface thermal environment. From the regression equation of the four ecological parameters and LST in study area over three years, it can be seen that
f
PV
and NDMI has a significant linear negative correlation with LST (
p
<0.01); NDBI and BSI have a significant linear positive correlation with LST (
p
<0.01). The spatial distribution of normalized RSIEI images and normalized LST images of study area showed an inverse spatial correlation, i.e., the areas with high RSIEI (good ecological quality) in the study area correspond to the areas with low LST and vice versa. The quantitative regression analysis of RSIEI and LST in 3 years in 4 mining intensive areas shows that, when RSIEI is increased by 10%, LST was decreased by 0.67–0.77°C. It is proved that the RSIEI model based on Principal Component Analysis (PCA) is suitable for the comprehensive evaluation of the surface thermal environment differentiation effect in mining intensive areas..
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Journal of Infrared and Millimeter Waves
Publication Date: Oct. 20, 2020
Vol. 39, Issue 5, 635 (2020)
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Image Processing and Software Simulation
Infrared Spectroscopy and Spectral Analysis
Materials and Devices
Millimeter Wave and Terahertz Technology
Photoelectric Technology and Application
Remote Sensing Technology and Application