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CRDS principle-based gas concentration measurement system of continuously adjustable laser light source

A technology of gas concentration measurement and laser light source, which is applied in the field of gas concentration measurement system based on CRDS principle, can solve the problem of data acquisition rate limited laser pulse frequency, etc., save optical isolators, facilitate installation, and improve system spectral resolution Effect

Inactive Publication Date: 2015-08-05
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The traditional pulsed CRDS measurement system has several urgent problems to be solved. The laser usually uses a pulsed semiconductor laser, and the data acquisition rate is limited by the pulse frequency of the laser.

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  • CRDS principle-based gas concentration measurement system of continuously adjustable laser light source
  • CRDS principle-based gas concentration measurement system of continuously adjustable laser light source

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the drawings.

[0025] Such as figure 1 It is the preferred system of the present invention. The optical connection is indicated by a dashed line and the electronic connection is indicated by a solid line. The system includes: a tunable single-frequency light source 1, a ring-down optical passive cavity 20 connected in the optical path, a sample detection electronics system 30, an indicating electronics system 40, a locking electronics system 50 and an optical passive cavity. There is an optical connection. The connection of the locking system between the optical passive cavity and the laser is an electronic connection. There is an electronic connection between the indicating electronics system 50 and the sample detection.

[0026] The schematic diagram of the measurement system designed by the present invention is as figure 2 As shown, the system uses a DFB (Distributed Feed-Back) laser as the l...

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Abstract

The present invention relates to a CRDS principle-based gas concentration measurement system of a continuously adjustable laser light source. The CRDS principle-based gas concentration measurement system comprises light path portion devices and electric circuit portion devices, wherein the light path portion devices comprise a laser, a light isolator, a light collimator, a wavemeter, and an optical passive cavity, and the electric circuit portion devices comprise a photoelectric detector, a control circuit, a PZT cavity length modulator, a high-speed data acquisition card and a computer. According to the present invention, the light in the one polarization direction is only utilized to detect, the connection with the light collimator adopts the polarization maintaining optical fiber connection, the light isolator in the system is eliminated, and the good polarization laser light beam can be obtained; the problem that the S component and the P component have different resonance frequencies in the annular cavity so as not to achieve the concurrent resonance is solved; a lot of the devices having the polarization beam splitting adjusting function are simplified and eliminated, and the light energy utilization rate of the laser is improved; and the on / off function of the laser is achieved through the current tuning so as to eliminate the AOM and the related control systems.

Description

Technical field [0001] The invention relates to the technical field of CRDS measurement systems, in particular to a gas concentration measurement system based on the CRDS principle of a continuously adjustable laser light source. Background technique [0002] In a traditional CRDS measurement system, a high-quality optical passive cavity for the gas to be measured usually uses a two-mirror straight cavity. The light intensity of the pulsed beam established in the cavity decays with time. For the cavity, the attenuation speed of the light intensity in the cavity is related to the reflectivity of the cavity mirror, the distance between the two cavity mirrors and the speed of the light in the cavity. When the optical passive cavity is filled with the gas to be measured, the attenuation speed of the light intensity in the cavity increases. Under good conditions, the light intensity in the cavity will show a single e-number attenuation. In this way, the intracavity absorption spect...

Claims

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Application Information

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IPC IPC(8): G01N21/39
Inventor 颜昌翔崔立红
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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