Laser power fluctuation monitoring and compensating device and method for photoacoustic spectrum measurement

A technology of laser power and photoacoustic spectroscopy, which is applied in the direction of measuring devices, color/spectral characteristic measurement, and material analysis through optical means, can solve problems affecting material identification, unfavorable instrumentation, and material spectrum measurement errors, etc., and achieve structural Simple settings, good wavelength adaptability, wide range of effects

Inactive Publication Date: 2015-07-22
XI AN JIAOTONG UNIV
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Problems solved by technology

[0003] In the current research on the application of quartz tuning forks in the field of gas detection, due to the widespread use of wavelength modulation technology, the final measurement of mass spectral lines is less affected by laser power fluctuations, and laser power fluctuations will only cause changes in the shape of absorption lines. It will affect the position of the spectral line, so when the wavelength modulation technology is used, the laser power is generally not monitored
[0004] In the current photoacoustic spectroscopy detection using the light intensity modulation method, the power fluctuation of the laser will interfere with the detection process, resulting in errors in the spectral meas

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  • Laser power fluctuation monitoring and compensating device and method for photoacoustic spectrum measurement

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[0024] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0025] see figure 1 , the present invention is used for the laser power fluctuation monitoring and compensating device of photoacoustic spectrum measurement, comprises variable-wavelength laser 2, signal source 4, data acquisition unit 9 and computer 1, and computer 1 is connected with variable-wavelength laser 2 by cable; A light intensity modulator 3 and a beam splitting prism 5 are sequentially arranged on the optical path where the variable wavelength laser 2 emits laser light; the output end of the computer 1 is connected to the input end of the signal source 4, and the output end of the signal source 4 is connected to the light intensity modulator 3; A first quartz tuning fork 6 for power monitoring is arranged on the optical path of the beam split by the beam splitting prism 5 , and th...

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Abstract

The invention discloses a laser power fluctuation monitoring and compensating device and method for photoacoustic spectrum measurement, and belongs to the technical field of photoelectric detection. Two quartz tuning forks are adopted at the same time for measurement; one quartz tuning fork is used for monitoring the fluctuation of the laser power; the other quartz tuning fork is used for measuring photoacoustic spectrum; the influence of the laser power fluctuation to the photoacoustic spectrum measurement is removed by processing the signal output by the quartz tuning fork used for measuring the laser power, and then compensating the measurement result of the photoacoustic spectrum; the fluctuation of the laser power is inhibited. The device is reasonable in design, simple in structure, and easy to realize; the method can monitor the laser power in real time, and compensate the fluctuation of the laser power, so as to inhibit the fluctuation of the laser power; the problem that the photoacoustic spectrum detection is interfered by the fluctuation of the laser power is solved.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, and relates to a laser power fluctuation monitoring and compensation device and method for photoacoustic spectrum measurement. Background technique [0002] Photoacoustic spectroscopy is a spectral technique developed based on the photoacoustic effect. Photoacoustic spectroscopy measures the amount of light energy absorbed by an object. It can measure strong light scattering and opaque objects that are difficult to measure by traditional spectral methods, and the samples can be measured whether they are crystals, powders, colloids, etc. It has high sensitivity and wide application range. advantage. It has broad application prospects in physics, chemistry, chemical industry, geology, biology, medicine and other aspects. [0003] In the current research on the application of quartz tuning forks in the field of gas detection, due to the widespread use of wavelength modulation techn...

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Application Information

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IPC IPC(8): G01N21/17G01N21/39
Inventor 贾书海马斌山张周强陈花玲
Owner XI AN JIAOTONG UNIV
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