Dual-channel miniature Raman spectrometer

Abstract

The invention discloses a dual-channel miniature Raman spectrometer, which comprises a near infrared laser diode or a near ultraviolet laser transmitter, a laser beam expanding collimator, an anti-laser laser and Raman light transmission first beam splitter, a zooming and non-zooming cylindrical surface or spherical surface objective lens, an anti-laser Ranman light transmission second beam splitter, a relay optical system, a narrow slit, two spectrum forming lenses, a line array or surface array CCD or CMOS detector, a GPS, and a data processing and wireless receiving and sensing system in sequential connection. After the photo is taken on a target in a laser channel or the sample measurement by optical axis alignment at the Raman channel, data is sent to a mobile phone and a cloud computer in a wireless way for processing of spectrum separation, wave peak finding, spectral database building, substance recognition and the like; the conclusion is fast obtained. The size of the spectrometer is small; the spectrometer can be conveniently carried and used; the measurement result can be seen in places with the Internet; the sensitivity and the resolution ratio are higher than those ofsimilar products.

Description

technical field [0001] The invention relates to a Raman spectrometer, in particular to a dual-channel miniature Raman spectrometer involving on-site measurement of various residual substances. Background technique [0002] Raman spectrum (Raman spectrum) is a kind of scattering spectrum. In 1928, C.V.Raman (Raman) discovered that when light passes through a transparent medium and is scattered by molecules, the frequency changes due to energy gain or loss. This phenomenon is called Raman scattering. In the scattering spectrum of a transparent medium, the frequency and the incident light frequency υ 0 The same component is called Rayleigh scattering; frequency symmetric distribution in υ 0 The spectral line or spectrum υ on both sides 0 ±υ is called Raman scattering or Raman spectrum, where υ 0 The scattering of -υ is called Stokes scattering, which is easy to occur and has been studied more; υ 0 The scattering of +υ is called anti-Stokes scattering, which is not easy to ...

AI Technical Summary

Problems solved by technology

However, because Raman spectroscopy is a scattering spectrum rather than an absorption spectrum, its sensitivity is not high. If the scattering cross section of the measured substance is at 10 -27 (cm 2 / melecule.srd) are often not detected, so the existing near-infrared and visible Raman spectrometers can only detect milligram-level substances that are visible to the eyes, but cannot detect trace substances that are invisible to the eyes

In addition, the traditional Raman uses a spherical microscopic objective lens, and the too small focal point will detonate when detecting explosives; for convenience, they all use optical fiber coupling slits to cause a large loss of light energy; the F number used in the spectrometer is 4. The large reflector C-T structure has a small luminous flux; the detector is a unit linear array CCD or CMOS, and the light energy passing through the vertical direction of the slit is wasted; the instrument uses a power-consuming touch screen (because it is not a computer, it can only display Curve can not be interpreted) or very big notebook, carry and use all very inconvenient; The purpose of the present invention is to overcome all these shortcoming

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