Method of non-refrigeration focal surface infrared cloud detection
A focal plane, non-cooling technology, applied in the direction of electric radiation detectors, signal transmission systems, instruments, etc., can solve the problem of high manufacturing cost and use cost of cooled infrared focal plane sensors, low signal-to-noise ratio of the original signal, and cannot be directly applied Cloud detection and other issues, to achieve the effect of clear cloud details, fast transmission speed, and strong temperature adaptability
Inactive Publication Date: 2009-07-08
中国人民解放军理工大学气象学院
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[0002] In the 1990s, the uncooled infrared focal plane (UFPA) technology reached a practical level. This technology freed the infrared thermal imaging system that relies on low temperature work from complex refrigeration devices, and realized small, reliable, and relatively cheap applications. Especially in precision guidance and thermal imaging tracking in the military field, it has been widely used, but the signal-to-noise ratio of the original signal is not high, and the value range is small, so it cannot be directly applied to cloud detection in atmospheric science
[0003] The application of the uncooled infrared focal plane in cloud measurement is currently in the research stage. For example, the infrared cloud imager (ICI) directly uses an infrared camera as a cloud measurement sensor to obtain the distribution of sky clouds. The design of the cloud sensor with low characteristics
[0004] However, the use of cooled infrared focal plane sensors is very expensive in terms of manufacturing costs and operating costs.
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[0014] Such as figure 1 , the infrared imaging component uses the polysilicon uncooled infrared focal plane detector produced by the French SOFADIR company, the sensing method is a microbolometer, the detection element size is 320×240, and the original image signal length is 10bit. After being accumulated by the adder, the image signals of each frame to be processed are written into the RAM memory according to the address sequence, and the image signal of the next frame is accumulated with this signal until the integration of 128 frames is completed, and the read-allowed signal is output (the more the frame number of the multi-frame The more the better, but the integration time is directly proportional to this, so take 128 frame integration), the readout circuit is as follows figure 2 The integrated 16-bit digital video signal is taken out according to the timing sequence, and transmitted to the terminal computer through the ARM system microprocessor and the network driver ch...
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The method of uncooled focal plane infrared cloud measurement uses the original digital signal of the cloud image obtained by the uncooled focal plane infrared detector to integrate the data of each point in the image in time series, that is, to take the average value of multiple frames, thereby improving The signal-to-noise ratio of the signal is obtained, and then the image signal output of the cloud is obtained. The beneficial effects of the invention are: fast transmission speed, high precision, noise reduction, improved image quality, and clear cloud details; theoretically, NETD is reduced from 100mK to 10mK. Both preparation and use costs are low.
Description
technical field [0001] The invention relates to a ground meteorological observation instrument and a measurement method thereof, in particular to a cloud measurement method of an uncooled focal plane infrared cloud measurement sensor. Background technique [0002] In the 1990s, the uncooled infrared focal plane (UFPA) technology reached a practical level. This technology freed the infrared thermal imaging system that relies on low temperature work from complex refrigeration devices, and realized small, reliable, and relatively cheap applications. In particular, it has been widely used in precision guidance and thermal imaging tracking in the military field, but the signal-to-noise ratio of the original signal is not high, and the value range is small, so it cannot be directly applied to cloud detection in atmospheric science. [0003] The application of the uncooled infrared focal plane in cloud measurement is currently in the research stage. For example, the infrared cloud ...
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IPC IPC(8): G01W1/00G01J5/10G01J5/12G08C19/00H04L12/28H04L29/06
Inventor 翟东力练进根高太长孙学金赵世军
Owner 中国人民解放军理工大学气象学院