Gas flow rate survey meter based on tunable diode laser absorption spectroscopy technology

A technology of laser absorption spectroscopy and gas flow rate, which is applied in fluid velocity measurement, absorption/scintillation/reflection spectroscopy, velocity/acceleration/shock measurement, etc., to achieve high measurement accuracy, reduced system maintenance, and large measurement range.

Active Publication Date: 2011-07-27
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

This is what ordinary speedometers cannot achieve

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  • Gas flow rate survey meter based on tunable diode laser absorption spectroscopy technology
  • Gas flow rate survey meter based on tunable diode laser absorption spectroscopy technology
  • Gas flow rate survey meter based on tunable diode laser absorption spectroscopy technology

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[0032] see figure 1 , 2, a gas flow rate measuring instrument based on tunable semiconductor laser absorption spectroscopy technology, including a red light source 5, a laser 13, a signal generator 14, a laser emitting device 9, a laser receiving device 10, a data acquisition card 19, and an optical fiber interferometer 15. The detector 17 and the data processing and display module 20, the area between the laser emitting device 9 and the laser receiving device 10 has the gas flow to be measured, and the subsequent optical path of the laser 13 is provided with a fiber combiner 6 and 1×4 optical fiber in sequence The beam splitter 7, the indicator light emitted by the red light source 5 and the laser beam emitted by the laser 13 are combined by the optical fiber beam combiner 6, and then divided into four beams by the 1×4 optical fiber beam splitter 7, one of which is sequentially passed through The fiber optic interferometer 15 and the data acquisition card 19 are input to the...

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Abstract

The invention discloses a gas flow rate survey meter based on the tunable diode laser absorption spectroscopy technology, comprising a red-light light source, a laser, a signal generator, a laser launcher, a laser receiving device, an optical-fiber interferometer, a data acquisition card, a detector, a locking amplifier and a data processing and displaying module. The gas flow rate survey meter works in an all optical fiber mode, which facilitates the remotely transmission of a signal. Compared with the prior art, the gas flow rate survey meter based on the optical method disclosed by the invention has the advantages of non-invasive monitoring object, high spatial resolution, high dynamic response, high measurement precision and big measurement range. The gas flow rate survey meter is easy to install, prevents dust, prevents from splashing, corroding and shocking and is suitable for monitoring industrial emission with high temperature, high dust content and high toxicity and corrosivity. The gas flow rate survey meter also can be used for measuring high-speed airflow of which the flow velocity reaches thousands of meters / second, and can be used for detecting airplane engines.

Description

technical field [0001] The invention relates to a laser spectrum measuring instrument for gas flow velocity, which is a gas flow velocity measuring instrument based on the principle of tunable semiconductor laser absorption spectrum and Doppler frequency shift, in particular, it is suitable for monitoring industrial exhaust gas and detecting ultra-high flow velocity It is a gas flow rate real-time measuring instrument with intrinsic safety, shockproof stability, non-contact, and full optical fiber operation. Background technique [0002] Industrial exhaust flue gas velocity measurement (low velocity) [0003] As a relatively special medium, flue gas generally has a temperature range of 40-150 ° C, and may reach a higher temperature under special circumstances. In addition, there are generally dust and acid gases such as SO in the flue gas. 2 , NO X How to solve the problems of large pipe diameter, low flow rate, wide range ratio, low static pressure, etc., and overcome du...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/26G01J3/42
Inventor 刘建国张亮许振宇刘文清阚瑞峰张玉钧
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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