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CARS based tomography imaging device, detection system and detection method

A tomography, imaging device technology, applied in the field of laser spectroscopy

Active Publication Date: 2019-06-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned technologies are not yet able to meet the needs of tomography for stable distribution of species concentration, temperature field and other information.

Method used

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  • CARS based tomography imaging device, detection system and detection method
  • CARS based tomography imaging device, detection system and detection method
  • CARS based tomography imaging device, detection system and detection method

Examples

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Embodiment 1

[0126] Example 1: Use the device of the present invention to detect the content of NO in a certain frozen biological tissue sample; wherein NO is a small molecule in the animal body, which plays an important role in signal transmission in many physiological activities, and detects different parts The concentration distribution of NO has clinical significance.

[0127] The actual experimental setup is attached figure 2 Shown; the Raman frequency shift due to NO is 1874.35cm -1 , then the detector (using a PIN tube), which uses a solid-state laser with a wavelength of 532nm as the pump light (green), then the wavelength of the corresponding Stokes light is 590.92nm (yellow); and since this experiment only needs to measure the concentration, use A tunable narrow-band dye laser can be used, and the dye is RhB; after the 532nm solid-state laser and the 590.92nm dye laser are combined, they are injected into the sample through the mirror 7, and then the CARS light with a wavelengt...

Embodiment 2

[0128] Embodiment 2: Adopt device of the present invention to carry out tomographic scan to flame temperature; Because stable flame temperature is the most commonly used and also the most important physical quantity in combustion diagnosis research, is the most intuitive description to combustion process; Then measuring flame temperature just can Understand the mechanism of various physical and chemical reactions that occur in the combustion process, understand the combustion process, evaluate the utilization of combustion energy, and then evaluate the overall evaluation of rocket engines and chemical reactors.

[0129] The device such as image 3 As shown, 8 is a chemical reactor capable of producing a stable premixed flame; the Raman frequency shift due to nitrogen is 2330cm -1 The left and right correspond to the Stokes wavelength center of 607.27nm in the laser light source; at the same time, in order to obtain the spectrum broadened by nitrogen under high temperature and ...

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Abstract

The invention discloses a CARS based tomography imaging device, detection system and detection method. The CARS based tomography imaging device comprises a detection light source, a to-be-measured sample supporting desk, an optical mechanical device, an optical filter and a detector; the detection light source detects a pump light and Stokes light combined detection laser beam; the optical mechanical device changes the distance l from the beam to the coordinate origin and the incident angle theta of the beam when the beam penetrates a to-be-measured sample; the optical filter filters pump light and Stokes light; and the detector detects coherent anti-stokes Raman scattered light generated when the to-be-measured sample is excited. The detection laser beam penetrates the to-be-measured sample, the coherent to-be-measured sample anti-stokes Raman scattered light is generated based on a three-order nonlinear effect of the to-be-measured sample, the optical filter filters the pump light and Stokes light mixed in the coherent anti-stokes Raman scattered light, and then the detector carries out detection. The defect that the prior art cannot meet requirements for large-scale tomography scanning of the stable distribution species concentration and temperature field can be overcome.

Description

technical field [0001] The invention belongs to the technical field of laser spectroscopy, and in particular relates to a CARS-based tomography imaging device, detection system and method. Background technique [0002] CARS (Coherent Anti-Stokes Raman Scattering) spectroscopy is a third-order nonlinear laser spectroscopy technique that uses the Raman active resonance of molecules to obtain spectral signals of molecules in gaseous, liquid, and solid states. Compared with ordinary Raman spectroscopy, it has the advantages of high SN ratio and the signal is not easily interfered by fluorescent signals. However, the current application of CARS technology pays more attention to one-dimensional and two-dimensional imaging. For example, detect the species concentration in uniform gas and liquid; or use CARS microscope technology to quickly obtain the two-dimensional species concentration distribution of the sample through the two-dimensional scanning of the scanning galvanometer; ...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 夏栩笙刘金波郭敬为袁红桑凤亭
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI