Archimedes spiral push-scan filtering differential gas leakage infrared imaging method

Abstract

The invention discloses an Archimedes spiral push-scan filtering differential gas leakage infrared imaging method which is suitable for an infrared focal plane detector. The method comprises the following specific steps: (1). designing an Archimedes spiral filter disk including a background optical filter, a leakage gas optical filter and two light barrier sheets, wherein the optical filters and the light barrier sheets are arranged in an alternative manner; (2). obtaining a leakage gas image, a background image and light barrier images A and B by using the filter disk to perform push-scan on the detector; (3). performing difference operation between the leakage gas image and the A and the B respectively, obtaining an average difference result and then obtaining a leakage gas image without blind elements; and performing difference operation between the background image and the A and the B respectively, obtaining an average difference result and then obtaining a background image without blind elements; (4). using the A and the B for calculating a non-uniformity correction model and performing non-uniformity correction on the results obtained in step three; and (5). carrying out difference operation between the corrected leakage gas image and the corrected background image and obtaining a final image. The method provided by the invention is suitable for differential infrared imaging of a leakage gas.

Description

technical field [0001] The invention relates to an infrared imaging method for Archimedes spiral push-broom filter differential gas leakage, which is a passive infrared imaging technology and belongs to the field of gas leakage detection. Background technique [0002] Infrared imaging enables the visualization of all phenomena in physics and chemistry related to the transfer of thermal energy. Most heteronuclear diatomic and polyatomic molecules absorb infrared radiation from 3 to 14 μm, so the 3 to 14 μm band is called the fingerprint region of gas molecules. [0003] The corresponding spectral ranges of the mid-wave infrared detector and the long-wave infrared detector are 3-5 μm and 8-14 μm, respectively. The atmospheric transmittance of infrared radiation in these two spectral ranges is relatively high, which can largely avoid the influence of the atmosphere on imaging, and is the atmospheric infrared transmission window. [0004] Infrared imaging of gas leakage is to ...

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Problems solved by technology

Both of the above two methods use a narrow-band filter. Although the percentage of the radiation absorbed by the gas in the total radiation received by the detector is increased, the narrow-band filter reduces the total radiation received by the detector, resulting in a decrease in the signal-to-noise ratio of the system. reduce

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