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Raman enhanced measurement device and method and off-axis integral cavity structure applied to Raman enhanced measurement

An off-axis integrating cavity and measuring device technology, applied in the field of spectral measurement, can solve problems such as complex devices and algorithms, and achieve the effect of easy operation and simple device structure

Inactive Publication Date: 2015-01-14
SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD
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Problems solved by technology

Although the off-axis integrating cavity technology can simplify the ring-down absorption spectroscopy system, the device and algorithm are relatively complicated to calculate the component and content of the measured sample by comparing the absorption spectrum with the input excitation light

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  • Raman enhanced measurement device and method and off-axis integral cavity structure applied to Raman enhanced measurement
  • Raman enhanced measurement device and method and off-axis integral cavity structure applied to Raman enhanced measurement
  • Raman enhanced measurement device and method and off-axis integral cavity structure applied to Raman enhanced measurement

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] In the present invention, by adopting the off-axis integrating cavity technology, the excitation laser is repeatedly oscillated in the cavity, so that the number of excited molecules is greatly increased, and the Raman spectrum is enhanced, so that the gas or liquid sample with a thin molecular concentration can also Generate a strong Raman spectrum, and through the analysis of the Raman spectrum peaks, the composition and concentration of the measured sample (gas or liquid) can be judged simply and accurately. Specifically, a Raman-enhanced measurement device is provided, including a laser, a collimation system, an off-axis integrating cavity, a light-receiving lens, a spectrometer and a control system arranged in sequence, and an edge filter placed between the off-axis integrating cavity and the between the receiving lenses. Among the...

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Abstract

The invention relates to the spectral measurement field and discloses a Raman enhanced measurement device. The Raman enhanced measurement device comprises a laser, a collimating system, an off-axis integral cavity, an edge filter, a light receiving lens, a spectrometer and a control system, which are arranged sequentially, wherein the off-axis integral cavity comprises a front plane-concave lens and a rear plane-concave lens, the concave surfaces of the lenses face the cavity, and a tested sample is contained in the cavity; the front plane-concave lens is coated with a total reflection film, a light hole is formed in a place deviated from a central shaft, and the rear plane-concave lens is coated with a laser high-reflection edge filter film. The invention also discloses a Raman enhanced measurement method using the Raman enhanced measurement device and an off-axis integral cavity structure applied to Raman enhanced measurement. The off-axis integral cavity technology is adopted to enable laser to be oscillated back and forth in the cavity for multiple times, the number of excited molecules is greatly increased, the Raman spectrum enhancement is realized, and thus the gas or liquid sample with low molecular concentration also can generate strong Raman spectrum; the composition and the concentration of the tested sample can be simply and accurately judged through analysis of Raman spectrum peaks.

Description

technical field [0001] The invention relates to the field of spectrum measurement, in particular to a measurement device and method based on Raman enhancement and an off-axis integration cavity structure used. Background technique [0002] Raman spectroscopy is called the "fingerprint" of molecules, which can observe the vibration-rotation energy level transition of molecules, and can provide simple, fast, repeatable, and non-destructive qualitative and quantitative material analysis. By analyzing the position of the Raman spectrum peak, the composition of the substance can be judged; by analyzing the signal intensity of the Raman spectrum peak, the total amount of the excited substance can be obtained. In addition, it does not require sample preparation, and the sample can be measured and analyzed directly through the fiber optic probe or through glass, quartz and fiber optics. However, the Raman signal is very weak. Even with various enhancement techniques, it can only be...

Claims

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Application Information

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IPC IPC(8): G01N21/01G01N21/65
Inventor 吴砺刘鸿飞黄富泉贺坤林湄林磊林志强
Owner SHANGHAI BRANCH FUZHOU GAOYI COMM CO LTD
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