Method for suppressing interference noise in spectral measurement through frequency modulation
A spectrum measurement and frequency modulation technology, which is applied in color/spectral characteristic measurement, material analysis through optical means, and measurement devices, etc., can solve problems such as poor suppression effect and complex structure
Inactive Publication Date: 2019-07-05
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0005] The purpose of the present invention is to overcome the shortcomings of the prior art, provide a method for suppressing interference noise in spectral measurement through frequency modulation, and solve technical problems such as poor suppression effect and complex structure in the existing suppression method of interference noise in spectral measurement
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[0032] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments.
[0033] like figure 1 As shown, a method for suppressing interference noise in spectral measurement by frequency modulation, including the following steps:
[0034] 1) The narrow linewidth light source generates the probe light with the center frequency ωc, and the optical field of the probe light is:
[0035]
[0036] where E 0 is the initial field strength.
[0037] 2) The detection light enters the electro-optic modulator, and the detection light is modulated by the electro-optic modulator. The electro-optic modulator is driven by a radio frequency generator, and the frequency of the radio frequency generator is ω m The modulation signal of is applied to the electro-optic modulator, when the probe light passes through the electro-optic modulator, the probe light is modulated, and the modulation frequency...
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The invention provides a method for suppressing interference noise in spectral measurement through frequency modulation, and relates to suppression of the interference noise in the spectral measurement. By adoption of the method provided by the invention, the technical problems that the existing method for suppressing the interference noise in the spectral measurement is poor in suppression effectand complicated in structure or the like are solved. The technical scheme of the invention is as follows: in the method for suppressing the interference noise in the spectral measurement through frequency modulation, a frequency modulation method is adopted to select appropriate modulation frequency, and when the modulation frequency is an integer or a half integer multiple of that of a free spectral region, the interference noise can be effectively suppressed. According to the method provided by the invention, only the appropriate modulation frequency needs to be selected, the shot noise canbe suppressed by performing frequency modulation on the spectrum without adding additional components and parts, meanwhile, the interference noise is further suppressed, and the detection sensitivityof the system is improved. Compared with the prior art, the method provided by the invention has the advantages of being simple and convenient, good in interference noise suppression effect and the like.
Description
technical field [0001] The invention belongs to the technical field of interference noise suppression in spectral measurement, and in particular relates to a method for suppressing interference noise in spectral measurement through frequency modulation. [0002] technical background [0003] Spectral measurement technology is widely used in the precise measurement of trace gases in various occasions, including atmospheric trace gas measurement, pollutant monitoring, reaction kinetics research, combustion process control, and medical research. In high-resolution spectral measurement, in order to obtain higher detection sensitivity, technologies such as increasing the effective optical path and harmonic detection are often used. These detection technologies can effectively suppress or even eliminate the influence of light source noise and minimize background fluctuations. However, in many spectroscopic measurement systems, due to the complex system design, Fabry-Perot interfere...
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IPC IPC(8): G01N21/27
CPCG01N21/27G01N21/274
Inventor 李传亮邵李刚邱选兵郑飞程桐
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY