High resolution infrared gas sensor

Abstract

The invention provides a high resolution infrared gas sensor which comprises a shell, a metallurgical powder net, a shell cover, an output pin, an infrared gas detector and an infrared light source, wherein the shell is internally and sequentially provided with an optical cavity, a signal control and collection circuit board and a main circuit board, the optical cavity is internally provided with an optical channel and is provided with a vent hole, the probe end of the infrared gas detector is arranged at one end in the optical channel, and the light emitting end of the infrared light source is arranged at the other end in the optical channel; a pin of the infrared gas detector and a pin of the infrared light source are respectively connected with a signal control and collection circuit, the signal control and collection circuit is connected with a main control circuit, and one end of the output pin is connected with the main control circuit; the optical channel is in an Archimedes spiral shape, and the inner wall of the optical channel is coated by gold. The sensor adopts the Archimedes spiral shape optical channel in a limited space to enable an optical path to be dramatically enhanced, thereby enhancing the test sensitivity and the test accuracy of the sensor.

Description

technical field [0001] The invention relates to an infrared gas sensor, in particular to a high-resolution infrared gas sensor. Background technique [0002] The existing infrared gas sensor is limited by its own volume, and the optical path of its optical channel is very short, resulting in low test sensitivity of the sensor, which can only perform qualitative gas concentration measurement, and it is difficult to perform high-sensitivity and high-precision gas test ; The existing infrared gas sensor is only a simple application of the infrared absorption principle, which has some characteristics of the infrared principle and lacks some relatively complete functions, such as anti-water vapor interference, temperature compensation, air calibration, digital output and other functions. It cannot adapt to the harsh environment and cannot meet the application fields with high precision and high requirements. [0003] For this reason, people are seeking a kind of technical soluti...

AI Technical Summary

Problems solved by technology

[0002] The existing infrared gas sensor is limited by its own volume, and the optical path of its optical channel is very short, resulting in low test sensitivity of the sensor, which can only perform qualitative gas concentration measurement, and it is difficult to perform high-sensitivity and high-precision gas test ; The existing infrared gas sensor is only a simple application of the infrared absorption principle, which has some characteristics of the infrared principle and lacks some relatively complete functions, such as anti-water vapor interference, temperature compensation, air calibration, digital output and other functions. Unable to adapt to harsh environments and unable to meet high-precision and high-demand application fields

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