Oxygen in situ detecting method and apparatus by infrared laser spectroscopy

Abstract

An oxygen gas in-situ measurement method for infrared laser spectrum and a device thereof belong to the gas detection technical field. The device comprises a main case, an in-situ measurement module and a shielded transmission cable, wherein a power switch, a data transmission interface, a liquid crystal display screen, a power socket, a fan and a first cable interface are mounted on the main case; a data acquisition processing and controlling module, a direct current voltage-stabilized module, a signal filter and amplify circuit, a temperature control module, a current control module, a lock-phase amplifier and a modulation signal generator are arranged in the main case; the in-situ measurement module comprises a second cable interface, a calibration pool slot, a gas outlet fast plug interface, a gas inlet gas plug interface, a first spherical mirror, a second spherical mirror, a semiconductor laser, a quartz window flake, a tungsten steel support rod, an auxiliary lens base, an auxiliary lens, a main lens, a main lens base, a sealing cover and a photoelectric detector. The measurement method combines semiconductor laser adsorption spectrum, wavelength modulation and harmonic wave detection and open-type long optical path reflection adsorption pool. The invention has sensitive detection.

Description

technical field [0001] The invention relates to an oxygen in-situ detection method and device of infrared laser spectrum, belonging to the technical field of gas detection. Background technique [0002] Currently commonly used oxygen monitoring instruments are mainly based on oxygen sensors based on electrochemical, oxide and semiconductor technologies. Although these instruments have sufficient detection sensitivity, they generally have disadvantages such as long response time, easy poisoning, and interference from other gases. Instrument maintenance large. For example, the commonly used zirconia-limited oxygen sensor requires a high working temperature (600°C), and its application in flammable and explosive environments will introduce great safety hazards; the Galvanic oxygen sensor is susceptible to interference from carbon dioxide gas. And the life is shorter. Contents of the invention [0003] The technical problem to be solved by the present invention is to propose...

AI Technical Summary

Problems solved by technology

[0002] Currently commonly used oxygen monitoring instruments are mainly based on oxygen sensors based on electrochemical, oxide and semiconductor technologies. Although these instruments have sufficient detection sensitivity, they generally have disadvantages such as long response time, easy poisoning, and interference from other gases. Instrument maintenance large

For example, the commonly used zirconia-limited oxygen sensor requires a high working temperature (600°C), and its application in flammable and explosive environments will introduce great safety hazards; the Galvanic oxygen sensor is susceptible to interference from carbon dioxide gas. and shorter lifespan

Images