Oxygen in situ detecting method and apparatus by infrared laser spectroscopy

An infrared laser and in-situ detection technology, applied in the direction of color/spectral characteristic measurement, can solve the problems of long response time, potential safety hazards, short life, etc., and achieve the effect of overcoming slow response speed and sensitive measurement

Active Publication Date: 2009-03-18
NANJING SHUNTAI TECH
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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.

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  • Oxygen in situ detecting method and apparatus by infrared laser spectroscopy
  • Oxygen in situ detecting method and apparatus by infrared laser spectroscopy

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Embodiment Construction

[0009] Such as figure 1 / figure 2 As shown, an in-situ detection method of oxygen concentration by infrared laser spectrum, the parameter signal set in the host computer is passed through the data acquisition processing and control module 104 to obtain the parameter control signal, and the parameter control signal is passed through the modulation signal generating circuit 113 to obtain a sawtooth wave signal, sine wave signal and trigger signal, the sawtooth wave signal and sine wave signal are passed through the current control module to obtain a modulation signal, the sine wave signal is output to the lock-in amplifier 112 as a reference signal, and the trigger signal is output to the data acquisition processing and control module 104 obtains the signal acquisition trigger signal, the temperature control module 110 outputs the laser temperature control signal, outputs the modulation signal and the temperature control signal to the semiconductor laser 207 through the shield...

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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...

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Application Information

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IPC IPC(8): G01N21/39
Inventor 张玉钧张立强
Owner NANJING SHUNTAI TECH
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