The infrared absorption spectrum is not only applied to the measurement of gas concentration, but also widely used to identify the structure of different molecules from characteristic absorption. The sensitivity is high, the reaction is rapid, the line can be continuously indicated, and the adjustment system can also be formed. The detection portion of the infrared gas detector commonly used in the industry consists of two parallel optical systems of the same structure. One is the measurement room and the other is the reference room. The two chambers open and close the optical path simultaneously or alternately through the slitting plate at a certain period.
When the gas to be measured is introduced into the measurement chamber, light having a specific wavelength of the gas to be measured is absorbed, so that the light flux that enters the infrared ray receiving chamber through the optical path of the measurement chamber is reduced. The higher the gas concentration, the less the luminous flux entering the infrared receiving plenum; the luminous flux through the reference chamber is constant, and the luminous flux entering the infrared receiving plenum is also constant.
Therefore, the higher the concentration of the gas to be measured, the greater the difference in luminous flux through the measurement chamber and the reference chamber. This luminous flux difference is projected to the infrared receiving plenum by the amplitude of the vibration of a certain period.
The receiving gas chamber is divided into two halves by a metal film of several micrometers thick, and the chamber is sealed with a gas having a relatively large concentration of the component to be measured, and the infrared rays incident can be absorbed in the absorption wavelength range, so that the pulsating luminous flux becomes The periodic change of temperature can then be converted into a change of pressure according to the gas equation, and then detected by a capacitive sensor, which indicates the measured gas concentration after amplification.
In addition to the capacitive sensor, a quantum infrared sensor that directly detects infrared rays can be used, and an infrared interference filter is used for wavelength selection and a tunable laser as a light source to form a brand-new all-solid infrared gas detector. The detector uses only one light source, one measuring chamber, and one infrared sensor to measure the gas concentration. Further, if a filter optical disc having a plurality of different wavelengths is used, the concentrations of various gases in the multi-component gas can be simultaneously measured.
Infrared gas detector is suitable for detecting all kinds of flammable and explosive, carbon dioxide gas. It has the characteristics of high precision, good selectivity, high reliability, no poisoning, no dependence on oxygen, less environmental interference, and long life. Occupy a broader industry high-end market, and gradually become the mainstream of the market in the future.
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