Ultraviolet remote Raman analyzer based on range-gated mode
A Raman analysis and pattern technology, which is applied in the direction of material analysis, Raman scattering, and material analysis by optical means, which can solve the problems of small working distance, low Raman spectral scattering efficiency, signal influence, etc., and improve the signal strength. , avoid fluorescence interference, improve the effect of Raman signal intensity
Pending Publication Date: 2019-07-16
中智科仪(北京)科技有限公司
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Problems solved by technology
[0005] At present, common Raman spectrometers on the market mainly use lasers with visible or near-infrared wavelengths such as 532nm, 785nm, and 1064nm as excitation sources, and the collected signals are easily affected by fluorescence signals and external stray light.
And the scattering efficiency of Raman spectrum is low, only 10 of the excitation light intensity -6 Around the order of magnitude
[0006] Moreover, in the detection operations under non-laboratory conditions, especially in the detection of flammable, explosive, dangerous explosives and other controlled items in public places such as airports and railway stations, as well as in outdoor ore and mineral detection scenarios, conventional continuous lasers are used as pullers. The mode of the Mann spectroscopy excitation source is no longer suitable due to the small working distance
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[0019] The long-range Raman spectrum analysis technology can effectively detect the target tens of meters away, and control the ICCD detector to "open the gate" at the time when the Raman signal arrives through timing synchronization, effectively reducing the environmental stray light and background fluorescence interference, Improve the signal-to-noise ratio of the Raman signal; at the same time, the use of ultraviolet Raman spectroscopy technology can effectively improve the Raman signal intensity and avoid the influence of fluorescence interference. Based on this principle, the patent application is discussed in detail.
[0020] Such as figure 1 As shown, a remote Raman analyzer based on a 266nm low repetition frequency pulse laser, including: a 266nm low repetition frequency nanosecond pulse laser 101, a target to be measured 102, a telephoto focusing system secondary mirror 103, a telephoto focusing system main A mirror 104, a notch filter 105, an off-axis parabolic mirr...
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Abstract
The invention provides an ultraviolet remote Raman analyzer based on a range-gated mode. The ultraviolet remote Raman analyzer mainly comprises a 266 nm low repetition frequency nanosecond pulse laser, a telescope focusing optical system, a grating spectrometer, a solar-blind ICCD detector and a time sequence control unit. Time sequence synchronization control of trigger synchronization and signalcollection is conducted on the nanosecond pulsed ultraviolet laser and the solar-blind ICCD detector through time sequence synchronization, and ultraviolet Raman signals of long-range targets are excited, collected and detected. The ultraviolet remote Raman analyzer can be used for Raman excitation and signal collection of the long-range targets, realizes non-contact nondestructive detection, canbe used for detection of articles such as inflammable and explosive products, ores, cultural relics and jewelry, and has the advantages of high signal-to-noise ratio, low fluorescence interference, long detection range and the like.
Description
[0001] Technical field: [0002] The invention relates to a remote target Raman analysis technology, in particular to an ultraviolet remote Raman analyzer based on a distance gating mode. [0003] Background technique: [0004] Raman spectroscopy reflects the internal vibration and rotational energy level information of molecules. It is a technique for qualitative analysis of molecular compounds and a fingerprint spectrum for molecular identification. Raman technology has the characteristics of non-contact measurement, fast detection speed, and no need for sample preparation. It is widely used in biomedicine, chemical products, physical chemistry, material science, mineral ore, explosives, cultural relics and antiques, flammable and explosive materials, liquid Reagents, criminal investigation and other testing and diagnosis. [0005] At present, common Raman spectrometers on the market mainly use lasers with visible or near-infrared wavelengths such as 532nm, 785nm, and 1064nm...
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IPC IPC(8): G01N21/65G01N21/01
CPCG01N21/65G01N21/01
Inventor 任文贞方正军金鹏程
Owner 中智科仪(北京)科技有限公司