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Power stable fast scanning absorption spectroscopy device and method based on polarization rotator

A polarization rotator and absorption spectrum technology, applied in the field of laser spectroscopy, can solve the problem of low detection sensitivity, and achieve the effects of improving the acquisition rate, speeding up the data acquisition rate, and convenient operation.

Inactive Publication Date: 2018-04-03
SHANXI UNIV
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Problems solved by technology

[0010] In order to solve the technical problem of low detection sensitivity caused by the power fluctuation noise of the laser in the current direct absorption spectroscopy technology, the present invention provides a power stable and fast scanning absorption spectroscopy device and method based on a polarization rotator

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  • Power stable fast scanning absorption spectroscopy device and method based on polarization rotator
  • Power stable fast scanning absorption spectroscopy device and method based on polarization rotator
  • Power stable fast scanning absorption spectroscopy device and method based on polarization rotator

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Embodiment Construction

[0030] The technology of the present invention will be further described below in conjunction with the accompanying drawings.

[0031] Such as figure 1 As shown, the 1KHz triangular wave fast scanning signal generated by the function generator 1 is sent to the distributed feedback laser 2 (NTT, NLK1L5EAAA) for scanning the output wavelength of the laser. The scanned laser beam becomes linearly polarized light through the polarizer 3, then passes through the polarization rotator 4, enters the analyzer 5, and then is divided into two parts by a 1:9 optical fiber beam splitter: the light intensity is stronger A part passes through the gas absorption cell 8 through the second collimating mirror 7, and is detected by the second photodetector 9 (PDs, Thorlabs, PDA10CS-EC) after interacting with the gas, and the absorption signal is finally sent to the computer 10; A collimating mirror 11 is then detected by a first photodetector 12, and fed back to the polarization rotator 4 throug...

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Abstract

The invention belongs to the technical field of laser spectra, and particularly provides a stable-power rapid-scanning absorption spectrum device and method based on a polarization rotator. The technical problem that in an existing direct absorption spectrum technique, the detection sensitivity is low due to the power fluctuation noise of a laser is solved. The stable-power rapid-scanning absorption spectrum device based on the polarization rotator comprises a function generator and a distributed feedback laser; an emergent light path of the distributed feedback laser is sequentially provided with a polarizer, the polarization rotator, an polarization analyzer and a beam splitter with two emergent ports; an emergent light path of one emergent port of the beam splitter is sequentially provided with a first collimating lens and a first photoelectric detector; the signal output end of the first photoelectric detector is connected with a proportional integral derivative controller, and the signal output end of the proportional integral derivative controller is connected with a voltage control port of the polarization rotator. The stable-power rapid-scanning absorption spectrum device and method are simple in technical scheme, convenient to operate, low in light intensity and noise and high in measurement precision.

Description

technical field [0001] The invention belongs to the technical field of laser spectroscopy, in particular to a power stable and fast scanning absorption spectroscopy device and method based on a polarization rotator. Background technique [0002] With the progress of human society, more and more attention has been paid to the precise control of industry and agriculture. Fine control can reduce production costs, reduce environmental pollution, and improve the yield and quality of agricultural products. Gas monitoring is an important part of fine control. For example, in the denitrification process of coal-fired boiler waste gas, it is necessary to monitor the concentration of ammonia in real time, so as to control the amount of ammonia or urea, and avoid the risk of incomplete denitrification or secondary pollution; in the process of coalbed methane methanation, it is necessary to Real-time monitoring of hydrogen sulfide, if the desulfurization is not complete, will cause fat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/39
CPCG01N21/39
Inventor 赵刚马维光谭巍李志新尹王保肖连团贾锁堂
Owner SHANXI UNIV
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