Dual-light adjustable infrared gas sensor

Abstract

The invention belongs to the technical field of sensors, and particularly relates to a dual-light adjustable infrared gas sensor which comprises a shell, and a liquid crystal operation screen is arranged on one side of the shell; a reflecting mirror is arranged on one side of the inner wall of the shell, a reference infrared light source is arranged on one side of the reflecting mirror, a reference filter is arranged on the other side of the reference infrared light source, a reference gas chamber is arranged on the other side of the reference filter, stable gas is arranged in the reference gas chamber, and a reference sensor is arranged on the other side of the reference gas chamber; a detection infrared light source is arranged on one side of the reference infrared light source, a detection filter is arranged on the other side of the reference filter, and a detection gas chamber is arranged on the other side of the detection filter; according to the device, the working reliability can be effectively improved, the detection precision is improved, the detection difficulty is reduced, the reference infrared light source and the detection infrared light source can be calibrated, the reference sensor and the detection sensor are prevented from drifting, and the stability of the detection device is ensured.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to a double-light adjustable infrared gas sensor. Background technique [0002] Infrared gas sensor, using infrared principle to detect gas concentration, mainly infrared absorption type, the core component is infrared sensor, infrared sensor uses different gases to absorb different degrees of infrared band, and detects gas by measuring infrared absorption wavelength, which has good anti-poisoning , sensitive response, strong gas pertinence, long service life, and strong environmental adaptability, but the structure is complex. [0003] Chinese invention patent 2014101195609 discloses a dual optical path single sensor gas infrared detection system and method with optical path deflection, including a reference infrared light source, a reference gas chamber, a detection gas chamber, a deflection mirror, an infrared photodetector and a deflection device. The deflection device drives t...

AI Technical Summary

Problems solved by technology

The deflection device drives the light source or a piece of reflector to deflect, so that the optical path switches between the reference gas chamber and the detection gas chamber, and reaches the infrared detector in time division. The infrared detector compares the intensity of the light signal detected twice before and after, and The common logarithm of the ratio of the two is used as the detection signal, and then converted into gas concentration by polynomial fitting according to the calibration sample. Only one infrared photodetector is provided in this application, so the detection accuracy and detection efficiency are low

[0004] At the same time, the existing infrared gas sensors have high requirements for the detection temperature environment, which will affect the detection accuracy of the infrared gas sensor at lower or higher temperatures, and even cause the infrared gas sensor to lose its detection ability; at the same time, the existing The gas detector cannot perform environmental compensation according to the actual scene, and the infrared light power emitted by the infrared light source cannot be adjusted, which reduces the working reliability and the infrared light emitted by the reference infrared light source and the detection infrared light source will weaken during long-term use, thus Reduce the detection accuracy, and even affect the detection results; at the same time, the reference sensor and the detection sensor will drift when used for a long time, which will affect the subsequent detection results and reduce the detection accuracy.

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