Portable three-channel near-deep-UV Raman spectrometer

Abstract

The invention discloses a portable three-channel near-deep-UV Raman spectrometer. The spectrometer comprises a near-deep-UV laser emitter, a laser spot shaping device, a first beam splitter, a zooming or non-zooming lens, a second beam splitter, a third beam splitter, a relay optical system, a point-to-line optical system, a spectrum forming system, an optical or mechanical sample scanning system and a data processing and wirelessly transmitting-receiving system. After Raman, fluorescent and visible / laser channels are fused in the point-to-point manner in real time, the whole sample is scanned, and data processing such as spectral separation, peak positioning, spectral library establishment and substance identification is carried out. The portable three-channel near-deep-UV Raman spectrometer has the advantages including that the flexibility and resolution are high, illumination points are large, the detection distance is long, rapid onsite non-contact measurement can be implement in the sun, and the spectrometer is relatively safe for the eyes.

Description

technical field [0001] The invention relates to the field of Raman spectroscopy, in particular to a portable near-deep ultraviolet Raman spectrometer. Background technique [0002] Raman spectroscopy (Ramanspectra) is a kind of scattering spectroscopy. 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 lines or bands on both sides υ 0 ±υ 1 called Raman scattering or Raman spectrum, where υ 0 -υ 1 The scattering is called Stokes scattering, which is easy to occur and has been studied a lot; υ 0 +υ 1 The scattering is called anti-Stokes scattering, which is not easy to occur, and there are few studies. An...

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Problems solved by technology

[0005] (3) Raman and fluorescence overlap together, the spectra are inseparable, and the interference is serious;

[0006] (4) There is no fluorescent channel with higher sensitivity available;

[0007] (5) There is no imaging channel, the system calibration is difficult, and the target is difficult to observe and locate;

[0008] (6) The detection distance is too short to measure the object directly under the microscope;

[0009] (7) The detection point is too small, and it takes a long time to scan the entire target;

[0010] (8) The target needs to be manually sampled before it can be measured, and it is impossible to conduct on-site non-contact analysis;

[0011] (9) It is easy to be interfered by sunlight and ambient light, and it is impossible to make unshielded measurement;

[0012] (10) Near-infrared and visible lasers are easy to damage the operator's retina

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