A system and method for measuring gas parameters using laser spectroscopy

Abstract

The invention discloses a system and method for measuring gas parameters by utilizing a laser spectrum. In the system for measuring the gas parameters by utilizing the laser spectrum, a locking device locks wavelength of a laser signal emitted by a laser output head of a first laser generator to be at a center position of an absorption line of a target molecule in a target molecule sample cell in which a first locking channel is located, a control device acquires the laser signal which is emitted by the laser output head of the first laser generator, is detected by a detector and enters into a receiving light path device and a sample measuring channel as well as a laser signal which is emitted by the laser output head of a second laser generator and enters into the sample measuring channel, analog-digital conversion is carried out on the acquired laser signals, and concentration of the measured target gas is measured according to analog-digital conversion result. The measuring speed of the system is restricted by the time for the control device to acquire data while minimum of the current time for acquiring data is in microsecond, and response time of a laser demodulation frequency is greatly improved compared with the prior art, thus the measuring speed is improved and time consumption is reduced.

Description

technical field [0001] The present application relates to the technical field of laser measurement, in particular to a system and method for measuring gas parameters by using laser spectroscopy. Background technique [0002] Laser absorption spectroscopy technology is a technology for measuring the temperature and concentration of the target gas to be measured. Specifically, it measures multiple absorption lines of a certain component in the gas to obtain the absorptivity of the component, and further bases on the absorptivity and the measured The corresponding relationship between the temperature of the target gas and the corresponding relationship between the absorption rate and the concentration of the measured target gas is measured, and the temperature of the measured target gas and the concentration of the measured target gas are obtained. [0003] At present, the commonly used laser absorption spectroscopy techniques include direct absorption spectroscopy and waveleng...

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Problems solved by technology

[0009] However, the above two methods need to scan the laser wavelength within a certain band range and record the laser spectrum when measuring the temperature and concentration of the target gas to be measured, so the measurement speed is limited by the modulation frequency of the laser, and the laser The fastest response time of the modulation frequency is 0.1ms, which reduces the measurement speed and increases the time consumption

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