A surface-array CCD prism spectrometer and its time-space accumulation data processing method

Abstract

The invention relates to an area array charge coupled device (CCD) prism spectrograph and a space-time accumulation data processing method thereof. The area array CCD prism spectrograph comprises a direct vision prism decomposition system, a convergent lens, an area array CCD and a computer. The direct vision prism decomposition system scatters light signals to be measured into monochromatic light with different wavelengths, and the monochromatic light is focused through the convergent lens to form a continuous linear spectrum with wavelengths arranged in a progressive increase mode. The area array CCD outputs corresponding charge quantity signals to the computer, and the computer is used for conducting data processing through space-time accumulation to generate a spectrogram to achieve display and storage of the spectrum to be measured. By means of the method, the sensitivity and signal to noise ratio of a spectrograph are effectively improved, and the method is especially suitable for fast measuring of weak spectrum signals. The area array CCD prism spectrograph is simple in structure, easy to machine and adjust, low in production cost, small in size, convenient to operate and wide in application range.

Description

technical field [0001] The invention relates to a spectrum detection instrument, in particular to a prism spectrum detection instrument based on an area array CCD and a time-space accumulation data processing method thereof, which is especially suitable for rapid detection of weak spectrum signals. Background technique [0002] A spectrometer is a device for spectral research and spectral analysis of substances, which can be widely used in many fields such as physics, chemistry, biomedicine, environmental science and food. A typical dispersive spectrometer structure includes an incident slit, a dispersive system, an imaging system, one or more exit slits and a spectral detection system. The dispersive system is the root of a spectrometer and can be a grating, a prism or a combination thereof. Patent CN011144106 discloses a CCD grating integrated full-wavelength spectrometer; Chinese patent 201110316117.7 discloses a catadioptric imaging spectrometer optical system based on ...

AI Technical Summary

Problems solved by technology

However, the sensitivity of CCD is much lower than that of photomultiplier tubes, and it is difficult to meet the high sensitivity and signal-to-noise ratio requirements for the detection of weak spectral signals such as Raman spectroscopy and fluorescence spectroscopy.

In the existing technology, the method of increasing the exposure time is often used to enhance the strength of the received signal, such as the high-performance spectrometer HR4000 of American Ocean Company, so it takes a long time to accumulate to realize the collection of weak spectral signals, and it is impossible to realize the rapid measurement of weak spectral signals

Patent application 201310525282.2 discloses a spectroscopic analysis system, which uses a high-sensitivity spectrometer with an optical fiber array and a low-temperature control photomultiplier tube array, but involves multi-channel time gate counting, high-voltage power supply, temperature control modules, etc., and has complex structures, large volumes, Disadvantages such as high energy consumption and high cost

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