Photon counting full-spectrum direct reading fluorescence spectrometer

Abstract

The invention provides a photon counting full-spectrum direct reading fluorescence spectrometer, which is mainly composed of an excitation light source, a spectrometer system, a photon counting imaging detector and an information processing and displaying unit. The excitation light source provides light energy to excite a sample to generate a characteristic fluorescence spectrum; the spectrometer system subjects the incident composite light containing the characteristic absorption spectrum to dispersion to give a spectral intensity distribution image; the photon counting imaging detector reconstructs the spectral intensity distribution image in a digital manner through position sensitive detection and photon counting; and the information processing and displaying unit performs qualitative and quantitative analysis on the sample according to the light intensity and the position of each image element in the digital spectral intensity distribution image. The spectrometer of the invention combines advantages of photon counting technology and full-spectrum direct reading technology, is low in detection limit, high in reading precision, good in data stability and large in linear dynamic range, can simultaneously analyze multiple substance components and make full use of each spectral line in a working wavelength range, and is rapid in working speed, simple in structure and good in operation stability.

Description

technical field [0001] The invention relates to a brand-new fluorescence spectrometer, that is, a photon counting full-spectrum direct-reading fluorescence spectrometer based on a "photon counting imaging detector". [0002] The invention is especially suitable for trace or ultra-trace analysis of atoms (elements), molecules, ions and other material components, and can be widely used in environmental monitoring, food safety, bio-optics, metallurgy, chemical engineering, geological exploration, medicine and health, etc. Industry and subject technical field. Background technique [0003] Fluorescence refers to the excitation of substances after absorbing light radiation, and the excited substances (atoms, molecules, ions or other substances) re-emit radiation with the same or different wavelengths as the excitation radiation during the de-excitation process. When the excitation light source stops irradiating the sample, the re-emission process stops immediately, and this re-e...

AI Technical Summary

Problems solved by technology

[0030] 1) Fluorescence spectrometers that use simple "charge integration method" for spectral analysis (such as detectors using CCD or CID or PD arrays, etc.), although the purpose of "full-spectrum direct reading" can be achieved, the corresponding "detection sensitivity " and "data stability" will be quite limited, "reading accuracy" and "linear dynamic range" will also be affected to a certain extent, and there is a serious signal overflow problem

[0031] 2) Fluorescence spectrometers that use a simple "photon counting method" to perform spectral analysis in a scanning manner (for example, the detector uses PMT or APD, etc.), although the corresponding "detection sensitivity" and "data stability" can be greatly improved, "Reading accuracy" and "linear dynamic range" can also be optimized to a certain extent, but "full-spectrum direct reading" cannot be achieved, and many advantages of "full-spectrum direct reading" cannot be achieved

Therefore, the advantages of the traditional atomic fluorescence spectrometer are mainly reflected in the sensitivity, that is, high sensitivity (low detection limit); if the "photon counting method" is adopted, it also has good data stability, high reading accuracy, large linear dynamic range and It has the advantages of not being affected by the signal overflow problem; the disadvantage is that it cannot be "full-spectrum direct reading", that is, it cannot analyze multiple material components at the same time, cannot make full use of every spectral line in the working wavelength range, slow working speed, complex structure, and difficult to operate. Poor stability (not suitable for on-site detection and online monitoring in harsh working conditions), relatively high production and operation costs, and cumbersome upgrades and adjustments, etc.

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