A substance detection device based on hollow photonic crystal fiber

Abstract

The invention discloses a substance detection device based on a hollow photonic crystal fiber, comprising a laser source, a beam coupling part, an incident end mechanical part, a fluid measurement part, an exit end mechanical part and a Raman spectrum detector; A beam coupling part is provided, and the beam coupling part couples the output beam of the laser source into the fluid measurement part, the mechanical part at the incident end is provided with a first fluid channel port, and the optical path at the exit of the other end of the fluid measurement part is provided with a Raman spectrum detector , for detecting Raman scattering signals, the fluid measurement part and the Raman spectrum detector are provided with an exit end mechanical part, and the incident end mechanical part is provided with a second fluid channel port; the present invention has high sensitivity, high signal-to-noise ratio, It can detect liquid and gaseous substances, the system is easy to build, the application range is wide, and the function is easy to expand.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a substance detection device, in particular to a substance detection device based on a hollow photonic crystal fiber, which is mainly used in food safety, quality detection, environmental monitoring, biological research, life science, medical treatment, process Substance detection in the fields of control, national defense security, quarantine inspection, etc. Background technique [0002] The demand for substance detection widely exists in the fields of food safety, quality inspection, environmental monitoring, biological research, life science, medical treatment, process control, national defense security, quarantine inspection, etc., and the requirements for substance detection in these fields are getting higher and higher. There is a material detection device in the prior art. The principle is a scattering spectrum detection method developed based on the Raman scattering effec...

AI Technical Summary

Problems solved by technology

There is a material detection device in the prior art. The principle is a scattering spectrum detection method developed based on the Raman scattering effect discovered by the Indian scientist Raman. By analyzing the scattering spectrum different from the frequency of the incident light to obtain molecules Vibration, rotation and other aspects of information, because the Raman scattering intensity is about one thousandth of Rayleigh scattering, so the traditional Raman scattering is very weak, in the Raman spectrum detection device, in order to obtain Raman spectrum information, it is necessary to analyze the Raman signal To enhance and improve the signal-to-noise ratio, the tip-enhanced Raman spectroscopy technology has appeared, and it has been realized and widely used. See the US patent, patent name: High contrast tip-enhanced Raman spectroscopy, inventors: Alexei P. Sokolov, Alexander Kisliuk, Disha Mehtant, Ryan D. Hartschuh, Nam-Heui Lee, patent number: US7656524B2, patent authorization time: February 2, 2010, there are certain advantages in the prior art, but there are still essential deficiencies. The Raman signal is weakened, and the needle tip is easily polluted, and the detection signal is easily disturbed, so the detection signal is easy to deviate from the true value, the sensitivity is not high, and the needle tip affects the flexibility of the detection system construction. Requirements exist for material properties that are inherently difficult to detect gaseous substances

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