Full-scale range infrared gas detector and measuring method thereof

Abstract

The invention provides a full-scale range infrared gas detector and a measuring method thereof. The gas detector comprises a metal shell which is provided with optical filters and a pedestal which is provided with a detector; the metal shell and the pedestal are encapsulated together; the metal shell is provided with four optical filters of different wavelength; the detector comprises a reference thermopile chip and three identical measurement thermopile chips; a first optical filter and the reference thermopile chip form a reference channel, and the rest three optical filters and the three measurement thermopile chips form three measurement channels. The measuring method is as follows: full-scale range of gas to be detected is divided into three ranges to be detected, and the three measurement channels respectively correspond to one of the ranges to be detected; finally, measuring-signal values obtained in the measurement channels and basic values obtained in the reference channel are output. The gas detector has the advantages of convenient usage, strong practicality and high precision; the measuring method is simple and practical and widens application space of the detector.

Description

technical field [0001] The invention relates to an infrared gas detector, in particular to a full-scale infrared gas detector and a measurement method thereof. Background technique [0002] At present, infrared gas detectors cannot achieve full-scale measurement, that is, cannot achieve detection from the PPM level to 100% VOL level; for example, for the detection of most gases containing carbon-hydrogen bonds, the filter has a filter at 3.4 microns. Strong absorption peak, in other words, the measurement channel used to measure the gas containing carbon-hydrogen bonds, the filter usually chooses a 3.4 micron wavelength filter, but it is only suitable for detection of a certain range or a certain concentration range, For detection beyond this range or concentration range, the resolution of detection will be difficult to meet the actual needs; it is not difficult to see that the use of existing infrared gas detectors in the field of IR instrument detection is always limited t...

AI Technical Summary

Problems solved by technology

[0002] At present, infrared gas detectors cannot achieve full-scale measurement, that is, the detection from PPM level to 100% VOL level cannot be achieved; for example, for the detection of most gases containing carbon-hydrogen bonds, the filter has a filter at 3.4 microns Strong absorption peaks, in other words, the measurement channel used to measure gases containing carbon-hydrogen bonds, the filter usually chooses a filter with a wavelength of 3.4 microns, but it is only suitable for the detection of a certain range or a certain concentration range, For detection beyond this range or this concentration range, the detection resolution will be difficult to meet the actual needs; it is not difficult to see that the use of existing infrared gas detectors in the field of IR instrument detection is always limited to detection of a certain range or a certain range. It is difficult to meet the requirements of the full range detection of the same gas

[0003] The detection range of existing infrared gas detectors is always limited to the detection of high concentrations, which cannot meet the measurement of low concentrations and small ranges; if one wants to meet the needs of different ranges, multiple detectors with different ranges are required, which greatly Adds cost and is cumbersome to select and use

Images