A kind of visible light Fourier transform absorption spectrum measurement method and system
A technology of Fourier transform and absorption spectrum, which is applied in the field of absorption spectrum measurement, can solve the problems of high complexity and high cost, hindering the development of visible light and near ultraviolet light FTS, etc., and achieve the effect of improving accuracy, eliminating errors and improving synchronization
Active Publication Date: 2021-08-24
OCEAN UNIV OF CHINA
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However, this method must rely on a high-stability dual-frequency laser (Zeeman-split) and a complex electronic system that can process signals in real time. The complexity and high cost problems are the main reasons hindering the development of visible and near-ultraviolet FTS. one
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[0024] In the following description, numerous specific details are given in order to provide a more thorough understanding of the present invention. It will be apparent, however, to those skilled in the art that the practice of the invention is not determined by details well known to those skilled in the art. Therefore, in other examples, some technical features known in the art are not described in order to avoid confusion with the present invention.
[0025] In order to thoroughly understand the present invention, detailed steps and detailed structures will be provided in the following description, so as to illustrate the technical solution of the present invention. Preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments besides these detailed descriptions.
[0026] refer to figure 1As shown, the present invention provides a visible light Fourier transform absorption spectrum measurement system...
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The invention provides a method and system for measuring visible light Fourier transform absorption spectrum, wherein the system includes two sets of Michelson interferometers, a photoelectric detection device and a signal acquisition and processing system, the Michelson interferometer and the photoelectric detection device After connection, the signal acquisition and processing system is connected, and the two groups of Michelson interferometers are the first Michelson interferometer and the second Michelson interferometer, and the first Michelson interferometer is a Michaelson interferometer with a moving arm beam folded 4 times. Michelson interferometer, the second Michelson interferometer of the present invention uses a hollow cube mirror instead of a glass cube mirror to eliminate the error caused by the glass body, and simultaneously uses dual beam output for simultaneous measurement to realize the calculation of the spectral absorption curve. The layout of the first Michelson interferometer (reference light interferometer) and the second Michelson interferometer (measured light interferometer) adopts a symmetrical design structure about the moving axis, thereby improving the synchronization of the optical path difference changes between the two interferometers, The accuracy of positioning the optical path difference sampling interval of the measured light interferogram is improved.
Description
technical field [0001] The present invention relates to a method and system for measuring absorption spectrum, in particular to the resolution and precision that can be achieved by visible light Fourier transform absorption spectrum measurement based on beam folding technology, which can achieve relatively high spectral resolution and accuracy under the premise of low cost. High-precision absorption spectrum measurement method and system. Background technique [0002] Due to the inherent advantages of high throughput, multi-channel, high spectral calibration accuracy and wide spectral range of Fourier transform infrared spectrometer (FTIR), it gradually replaces spectroscopic spectrometer in the infrared and near-infrared bands and is widely used in atoms and Molecular physics, analytical chemistry, spectroscopy and other disciplines. In the ultraviolet and visible light bands, it is difficult to obtain high-resolution and high-precision interferogram optical path differenc...
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IPC IPC(8): G01N21/31G01N21/39G01N21/25G01N21/01
CPCG01N21/01G01N21/255G01N21/31G01N21/39G01N2021/0112G01N2021/3185G01N2021/3196
Inventor 王旭柱张广玉梅方方
Owner OCEAN UNIV OF CHINA