Fluorescence-Raman synchronous block detector

Abstract

The invention provides a fluorescence-Raman synchronous block detector used for detecting elementary composition information and molecular structure information of to-be-detected blocky objects synchronously. The fluorescence-Raman synchronous block detector comprises a light source generation unit, a fluorescence excitation unit, a Raman excitation unit and a spectrum detection unit. The light source generation unit comprises a laser device, a nonlinear frequency doubling crystal used for converting laser beams into fundamental frequency light and doubling frequency light, and a beam splitting plate used for splitting the fundamental frequency light and the doubling frequency light. The fluorescence excitation unit comprises a first beam widening concave mirror and a first focusing convex mirror. The first focusing convex mirror is used for focusing the fundamental frequency light onto the to-be-detected objects to form small particles on the surfaces of the to-be-detected objects. The Ramen excitation unit comprises a second beam widening concave mirror and a second focusing convex mirror. The second focusing convex mirror is used for focusing the doubling frequency light to the small particles. The spectrum detection unit comprises a collection concave mirror, a first light sport cutting mirror group, a second light sport cutting mirror group, an off-axis paraboloidal mirror, a filtration unit and a spectrum analysis unit. The collection concave mirror is used for collecting reflected detection light signals. The spectrum analysis unit can acquire the molecular structure information and the elementary composition information according to Raman signals and fluorescence signals.

Description

technical field [0001] The invention relates to a spectrum detection device, in particular to a fluorescent Raman synchronous block detection device. Background technique [0002] Due to the characteristics of non-contact, high precision and low cost of laser spectroscopy technology, it has become the mainstream unknown component calibration technology today. Existing laser spectroscopy techniques include: laser-induced fluorescence spectroscopy, Raman spectroscopy, infrared spectroscopy, absorption spectroscopy, laser-induced anti-Stokes spectroscopy, terahertz time-domain spectroscopy, etc. [0003] Among them, laser-induced fluorescence spectroscopy is a commonly used spectroscopic technique. Although it can destroy the surface of the block to detect the inner layer, it can only measure the component element information of the analyte and cannot detect complex structures. [0004] In addition, Raman spectroscopy is the most commonly used spectroscopic method for calibrat...

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Problems solved by technology

[0005] However, Raman spectroscopy also has major defects in the calibration of the composition of bulk objects.

The reasons are as follows: 1) Most of the lumps are solid, and the distance between molecules is small, which leads to complex Raman spectrum structure. In actual detection, multiple spectral lines often overlap, which is extremely difficult to distinguish; 2) The surface composition of the lumps and The internal composition may be different, and Raman spectroscopy technology can only detect the surface composition of blocky objects; 3) When the existing Raman spectroscopy technology detects solids, the detection time is long, and rapid composition calibration cannot be achieved

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