Compact portable multi-wavelength in-situ Raman detector and detection method thereof

Abstract

The invention relates to a compact portable multi-wavelength in-situ Raman detector, which comprises a micro control system, a laser, a spectrograph module and a multi-wavelength Raman front optical path module. The multi-wavelength Raman front optical path module comprises a plurality of Raman front optical path modules and an optical path coupling module. The plurality of Raman front optical path modules respectively correspond to different wavelength ranges and share the optical path coupling module; the light path coupling module is provided with a long-wave-pass dichroscope and a short-wave-pass dichroscope which are used for selectively transmitting and / or reflecting light beams with different wavelengths respectively. On the premise that a moving device is not added and the stability of the instrument is guaranteed, the detection modules in three wavelength ranges are organically combined, and the in-situ and simultaneous detection requirements of Raman of three wavelengths aremet. Aiming at the characteristics of a sample, under a characteristic wavelength Raman precise detection mode and a multi-wavelength fluorescence quenching precise detection mode, fluorescence background signals can be effectively reduced, the detection accuracy and reliability are improved, and the application range is widened.

Description

technical field [0001] The invention belongs to the field of photoelectric detection, and relates to an in-situ spectrum detector with multiple laser light sources and a detection method thereof, in particular to a compact and portable in-situ Raman spectrum simultaneous detection of multiple laser wavelengths, which is suitable for substances with different characteristics molecular structure analysis. Background technique [0002] In the Raman spectroscopy test, the characteristics of the test samples are different, and it is usually necessary to select a specific Raman excitation wavelength. For example, for inorganic compound samples, lasers with ultraviolet wavelengths or visible wavelengths are usually used for Raman testing, while biological samples have complex substrates. Usually there will be strong fluorescence background interference, so the near-infrared band laser is selected to reduce the generation of sample fluorescence signals. [0003] Conventional portab...

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Problems solved by technology

[0003] Conventional portable Raman spectroscopy is usually equipped with only one laser. For example, Chinese invention patent application No. 201610634478.9 discloses a "portable Raman spectrometer", including a single laser, an external optical system, a single spectrometer and a control system; in practical applications Among them, this existing technology is difficult to meet the detection requirements of various types of samples; large-scale multi-wavelength Raman spectroscopy systems usually use mechanical switching devices, which not only increase the volume of the instrument but also affect the stability of the whole machine

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