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Weak optical source Rowland grating linear array CCD/CMOS detector optical splitting system and method

A Roland grating and spectroscopic system technology, applied in the field of atomic emission spectroscopy, to achieve the effects of high signal amplification, small aberration, and high signal-to-noise ratio

Pending Publication Date: 2019-12-20
NCS TESTING TECH
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Problems solved by technology

In the prior art, there is no report on the spectroscopic system of the Roland grating when the light source is weak.

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  • Weak optical source Rowland grating linear array CCD/CMOS detector optical splitting system and method
  • Weak optical source Rowland grating linear array CCD/CMOS detector optical splitting system and method
  • Weak optical source Rowland grating linear array CCD/CMOS detector optical splitting system and method

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] The core of the invention is to establish a CCD / CMOS full-spectrum Roland optical system with ultra-high luminous flux, ultra-strong spectral resolution, and high signal-to-noise ratio. It converts weak light into parallel light through a plano-convex lens; through a cylindrical lens, the parallel light is focused into a line spot on the surface of the slit, and passes through the slit to the maximum; the Roland grating system disperses and focuses the mixed light passing through the slit to the Rowland circle On the corresponding CCD / CMOS detector chip on the surface, a cylindrical lens is placed 10mm in front of the detector surface, and the placement direction is perpendicular to the cylindrical lens in front of the slit, so that the monochromatic light of each wavelength can be focused on the chip surface in the direction of the height of the ...

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Abstract

The present invention belongs to the technical field of atomic emission spectroscopy, and relates to a weak optical source Rowland grating linear array CCD / CMOS detector optical splitting system and method, which is applied to a micron-sized fractional laser-induced breakdown spectroscopy great than or equal to 5 [mu]m. The optical splitting system successively comprises a plano-convex lens (2), afirst cylindrical lens (3), an entrance slit (4), a concave grating (5), a second cylindrical lens (6) and a CCD / CMOS detector (7) along a beam propagation direction. The entrance slit (4), the concave grating (5) and the CCD / CMOS detector (7) are on a Rowland circle, an optical source (1), the plano-convex lens (2) and the first cylindrical lens (3) are outside the Rowland circle, and are collinear with the entrance slit (4) and the concave grating (5). Compared with a conventional Rowland optical system, the optical splitting system has characteristics of being high in optical resolution, large in signal magnification times, great in signal-to-noise ratio and the like, and is especially suitable for spectral analysis of a monopulse and a plurality of pulses of a fractional laser spectrometer.

Description

technical field [0001] The invention belongs to the field of atomic emission spectroscopy, and in particular relates to a weak light source Roland grating linear array CCD / CMOS detector spectroscopic system and method applicable to a micron-scale micro-beam laser (≥5 μm) induced breakdown spectrometer. Background technique [0002] Laser-Induced Breakdown Spectroscopy (LIBS for short) uses a high peak power pulsed laser to irradiate the sample, and the beam is focused to a small analysis point (micron scale). The material is ablated away and a cloud of nanoparticles forms above the sample. Since the peak energy of the laser beam is quite high, its absorption and multiphoton ionization effects increase the opacity of the gas and aerosol clouds generated above the sample, even if only a short laser pulse is excited, since the energy of the laser is significantly absorbed by the The cloud absorbs, and the plasma gradually forms. The high-energy plasma melts the nanoparticles, ...

Claims

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Application Information

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IPC IPC(8): G01N21/71G02B27/09
CPCG01N21/718G02B27/0966G02B27/0944
Inventor 袁良经贾云海于雷何淼王立平
Owner NCS TESTING TECH
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