Raman spectrum detection system based on single crystal sapphire optical fibers and sapphire optical fiber probe manufacturing method

Abstract

The invention discloses a Raman spectrum detection system based on single crystal sapphire optical fibers and a sapphire optical fiber probe manufacturing method. The system comprises a laser emitting module, a semi-transparent semi-reflecting first long pass light filter, a second coupler, a sapphire optical fiber probe and a spectrometer detection and analysis module. The laser emitting module is used for emitting single wavelength excitation light and introducing the single wavelength excitation light into the sapphire optical fiber probe. The sapphire optical fiber probe collects the Raman scattering signal light of the sample to be detected. The spectrometer detection and analysis module analyzes and detects the Raman spectrum. The manufacturing method comprises immersing the single crystal sapphire optical fibers in a mixed solution of a trisodium citrate solution and an AgNO3 solution under action of laser so that a silver nanoparticle film with Raman surface enhancement effects grows. The system and method simplify the optical fiber bundle filtering scheme for inhibiting the high background noise of the quartz optical fiber as the Raman probe material, and ensure the signal-to-noise ratio of the Raman spectrum detection.

Description

technical field [0001] The invention relates to a probe-type Raman spectrum detection system, in particular to a Raman spectrum detection system based on a single crystal sapphire fiber and a manufacturing method of a sapphire fiber probe. Background technique [0002] Raman spectroscopy is a molecular spectral fingerprint identification method based on the principle of Raman scattering. When light interacts with molecules and scatters, a small number of photons undergo Raman scattering in inelastic scattering and transfer part of their energy to molecules, making scattering. The frequency of light is shifted, and the amount of shift carries molecular information. Due to different molecular structures, the displacements are different, and the corresponding Raman spectra are also different. According to the obtained Raman spectra, the presence and relative content of chemical substances in the sample can be detected. Raman spectroscopy is a molecular structure characterizati...

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Problems solved by technology

[0006] The problem to be solved by the present invention is to provide a Raman spectrum detection device based on a sapphire optical fiber probe, which can realize that a single optical fiber in the probe can be used as an excitation optical fiber and a collection optical fiber at the same time, and solve the problem of an amorphous silica optical fiber in the 300cm -1 to 800cm -1 The Raman spectrum background noise in the low wavenumber range is used to identify and separate the interference problems caused by the Raman spectrum signal of the sample, which can provide high-quality Raman spectrum signal, significantly reduce the system complexity of the device and improve the reliability and reliability of the fiber optic probe stability

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