Multisectional infrared-band gas detection apparatus and method

Abstract

The invention provides a multisectional infrared-band gas detection apparatus and method, belonging to the technical field of optical detection of gas. In the prior art, detection of different gases needs different infrared sensors, which leads to high cost of apparatuses, inconvenience of usage and limited varieties of gases for detection. The multisectional infrared-band gas detection apparatus employs a plurality of bandpass filters and an empty window; the bandpass filters and the empty window are distributed on the periphery of a rotating disk at an equal angle; all the bandpass filters have equal pass bands which are successively distributed in the infrared band; the rotating disk carries out stepped rotation, and the plurality of bandpass filters successively pass a position located between an infrared lens and an infrared photoelectric device; the infrared photoelectric device sequentially transmits a plurality of detection pulses to a signal integration circuit for packing so as to obtain an infrared radiation sequence of to-be-detected gases; the infrared radiation sequence is transmitted to an analysis and processing unit for determination of the varieties of the to-be-detected gases according to the characteristic radiation sequence databases of a variety of gases; and a displaying and alarming unit carries out displaying and alarming.

Description

technical field [0001] The invention relates to a gas detection device and method in multi-equal infrared bands, belonging to the technical field of gas optical detection. Background technique [0002] The existing detection methods of toxic and harmful gases include contact and non-contact. Contact detection Only when the toxic and harmful gas spreads to the position of the detector and triggers the detector, the detector can detect the gas and give an alarm. The detector is greatly disturbed by environmental factors and is extremely sensitive to the environment. The range is small, the response time is long, and manual calibration is often required due to aging and poisoning. Infrared thermal imaging detection technology using infrared imaging spectrometer is widely used for its superior thermal sensing ability and the ability to detect invisible substances such as chemical gases, and is an effective means to realize non-contact imaging detection of gases. However, the e...

AI Technical Summary

Problems solved by technology

It can be seen that this scheme needs to use different infrared sensors to detect different gases, which not only leads to high device cost, but also is inconvenient to use, and also shows that the types of gases that can be detected by this scheme are limited

Moreover, the narrow-band interference filter used in this solution has a very narrow pass-bandwidth, which is difficult to manufacture, high in cost, and prone to drift during use.

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