Hazardous gas real-time detection device based on infrared multispectral imaging

Abstract

The invention relates to the field of infrared multispectral gas detection. The invention provides a hazardous gas real-time detection device based on infrared multispectral imaging. The device comprises a first broadband infrared optical lens, a narrow-band optical filter switching device provided with n narrow-band optical filters and a stepping motor and a broadband uncooled focal plane detector which are sequentially arranged along an incident light path of a channel 1, and a second broadband infrared optical lens, an infrared beam splitter and n specific waveband uncooled focal plane detectors which are arranged in order along the incident light path of a channel 2, an image processing module connected with each detector and a control module connected with the stepping motor; the image processing module is used for partially replacing the image output by the channel 2 with the image output by the channel 1, carrying out multispectral imaging on the replaced image to obtain an image, carrying out multispectral imaging on the image output by the channel 1 in one period to obtain an image Bk, fusing the Bk, and outputting the image. The hazardous gas real-time detection device can improve the precision and the efficiency of the hazardous gas detection.

Description

technical field [0001] The invention relates to the technical field of infrared multispectral gas detection, in particular to a real-time detection device for dangerous gas based on infrared multispectral imaging. Background technique [0002] In many industrial sites, dangerous gases (such as methane, liquefied natural gas, ethylene and other industrial gases and their liquefied products that are harmful to organisms and ecological environment) need to be used or produced, and the leakage of dangerous gases is not only related to environmental pollution, but also It is directly related to people's safety and social stability, so a set of visual frame inspection equipment that can quickly detect, locate, image and quantify the types and concentrations of dangerous gases is very important. [0003] Infrared absorption spectroscopy technology is one of the key technologies for detecting dangerous gases. This technology uses the absorption of infrared light by gas molecules to ...

AI Technical Summary

Problems solved by technology

Among them, even if the rotation speed of the filter wheel is fast, the device cannot obtain eight photos at the same time, which reduces the real-time performance of the device. At the same time, for scenes with rapid gas changes, the collected image data itself will not match the actual gas distribution. The problem

This kind of device has obvious defects and deficiencies: (1) the use of mechanical devices to switch filters makes it impossible for the device to obtain single-spectrum images of each infrared sub-band of a scene at the same time, which reduces the accuracy of gas detection using multi-spectral imaging, especially Especially under extreme conditions, the distribution of gas changes rapidly, which will make the infrared scene radiation data collected by the device meaningless, making the output video lack real-time and accuracy; Compared with the infrared sensor of a specific band, the infrared sensor of the broadband system has insufficient accuracy

Using the method of infrared beam splitter for multi-spectral imaging, although single-spectrum images of different infrared sub-bands of a certain scene can be obtained at the same time, this method also has obvious disadvantages: (1) The spectroscopic method uses an infrared beam splitter to convert the full-spectrum image Divided into multiple single-spectrum images, which will distort the collected single-spectrum images, and correspondingly, the accuracy of the final output video stream will be greatly reduced; (2) Using spectroscopic methods for multi-spectral imaging requires fast processing of multiple single-spectrum images The image is imaged, which has higher requirements on the processing capability of the image processing unit

[0006] It can be seen that the existing hazardous gas detection devices use two-dimensional devices to collect three-dimensional information, either sacrificing resolution like the spectroscopic method, or sacrificing time for scanning like the filter method

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