Optical heterodyne method cavity ring down spectral measurement device and method

An optical heterodyne and spectral measurement technology, applied in the field of spectral detection, can solve problems such as difficult operation, high cost, and insufficient precision, and achieve the effects of high sensitivity, short turn-off time, and high precision

Active Publication Date: 2019-04-05
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0008] Aiming at the problems of difficult operation, high cost, and insufficient precision in the traditional cavity ring-down spectroscopy (CRDS...

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  • Optical heterodyne method cavity ring down spectral measurement device and method
  • Optical heterodyne method cavity ring down spectral measurement device and method
  • Optical heterodyne method cavity ring down spectral measurement device and method

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Embodiment Construction

[0038] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0039]The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects and not necessarily Describe a particular order or sequence. It is to be understood that the terms so used are interchangeable under appropriate ci...

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Abstract

The embodiment of the invention discloses an optical heterodyne method cavity ring down spectral measurement device and method. The measurement device comprises a laser light source for generating a laser beam, a modulation optical path mechanism, a passive resonant cavity for receiving the laser beam modulated by the modulation optical path mechanism and performing interference superposition on the laser beam, an optical heterodyne detection mechanism for receiving the laser beam subject to the interference superposition and generating an electrical signal, a data processing mechanism for receiving the electrical signal and determining a relationship between the electrical signal and a preset threshold, and if the electrical signal is greater than the preset threshold, the data processingmechanism sends an instruction of turning off the laser light source, collecting and drawing a ring down curve via a data collection circuit, and calculating the concentration of trace substance to be measured. By adoption of the measurement device and method, the measurement accuracy can be improved, the operation is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of spectrum detection, in particular to an optical heterodyne cavity ring-down spectrum measurement device and method. Background technique [0002] In many fields such as environmental analysis, life science, medical treatment, national defense security, advanced manufacturing industry, etc., there are a large number of detection requirements for trace substances, and the requirements for detection sensitivity are getting higher and higher. Among various ultra-high sensitivity spectral detection technologies, the technology based on passive resonant cavity enhancement is an important category. The feature based on the passive resonant cavity enhancement technology is that the sample to be measured is placed in the resonant cavity, and the multiple reflection of the light wave by the resonant cavity is used to increase the distance between light and matter, thereby improving the measurement accuracy. For a ...

Claims

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Application Information

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IPC IPC(8): G01N21/39
CPCG01N21/39
Inventor 颜昌翔宋绍漫
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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