Prism spectrograph

Abstract

The invention discloses a prism spectrograph comprising an incident aperture used for importing composite wavelength light emitted by an external light source and transmitting same to a collimating lens; the collimating lens is used for reflecting the composite wavelength light transmitted by the incident aperture, and collimating and irradiating the light to a prism group; the prism group comprises many prisms, is used for dispersing the composite wavelength light for many times so as to form dispersion light, and transmitting the dispersion light to a focusing lens; the focusing lens is used for gathering the dispersion light and transmitting same to a light sensor; the light sensor is used for converting the dispersion light into an electric signal and sending same to an electric signal processing device; the electric signal processing device is used for parsing processing and / or transmitting the electric signals. The prism spectrograph uses many prisms of the prism group to realize the light large dispersion degree, so optical path and reflection surface can be smartly matched, thus ensuring the degree of dispersion, obviously improving the luminous energy utilization rate, and reducing the volume.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a prism spectrometer. Background technique [0002] A spectrometer is an instrument that decomposes complex light into spectral lines. Classical dispersive spectrometers mainly include prism spectrometers and grating spectrometers. Classical dispersive spectrometers are based on slit incident apertures and use prisms or gratings as spatial dispersion elements. The light intensity signal after dispersion is collected, and the light information is captured by the spectrometer, developed with a photographic film, or displayed and analyzed by a computerized automatic display numerical instrument, so as to determine what elements are contained in the item. This technology is widely used in the detection of air pollution, water pollution, food hygiene, metal industry, etc. The working spectral range of the spectrometer has a great relationship with the dispersion ability of the spati...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional prism spectrometer has a huge volume and high cost to achieve the same dispersion, or the dispersion degree is not enough after the volume is reduced. This is already a major problem in the industry. Therefore, most of the small-scale dispersive spectrometers on the market are grating spectrometers, which are based on diffraction gratings as dispersive elements. Although they have the advantages of large dispersion and small volume under the same dispersion degree, they usually only use multiple diffraction orders. Light energy of a diffraction order, and the spot after imaging is in the shape of a crescent moon. When the spot of this shape is irradiated to a general linear array light sensor, only a part of the energy is used, and the light energy utilization rate of the sensor is low.

If the light sensor is a square pixel, the light energy loss may even reach more than 90%, resulting in low light energy utilization

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