Optical system for multi-grating spectral analysis with small cylindrical mirror

Abstract

The invention discloses an optical system of a miniature cylindrical mirror multi-grating spectrum analysis, and belongs to the technical field of optical design. For resolving the problem that in an existing grating spectrometer, due to the fact that a slit is used as a system aperture, energy usage ratio of the system is low. In the optical system, after light emitting by a light source is coupled through an optical fiber, the light is emitted to a bonding lens I, the light becomes compound-color parallel light from divergent beams, the compound-color parallel light is emitted to the surface of a blazed grating I, and the blazed grating I enables the compound-color parallel light to be dispersed into spectrum bands; the spectrum bands are converged on the surface of a digit micro-mirror array; the digit micro-mirror array conducts single-wavelength gating on the spectrum bands, and the compound-color light is emitted to a blazed grating II through cylindrical lenses II successively; finally, the light is focused on a detector through a bonding lens II; by the adoption of a symmetric-type M-shaped structure, a coma aberration of the system is reduced; the optical fiber is used for replacing the entrance slit, so that more light emitted by the light source is coupled to the optical system, light energy loss is reduced, and efficiency for light energy utilization of the system is improved.

Description

technical field [0001] The invention relates to an optical system for multi-grating spectral analysis of a small cylindrical mirror, which belongs to the technical field of optical design. Background technique [0002] Devices for spectral measurements are widely used in fields such as chemometrics and scientific research. With the maturity of the production technology of multi-channel detection devices, the near-infrared spectroscopy instrument composed of fixed optical path, grating spectrometer and multi-channel detector is becoming more and more popular due to its stable performance, fast scanning speed, high resolution and good performance-price ratio. more and more people's attention. [0003] Such as figure 1 As shown, the existing grating spectral analysis optical system includes a light source 1, a slit 2, a collimator lens 3, a grating 4, an imaging lens 5, and a CCD camera 6. The slit 2 is used as the system diaphragm, and the light source 1 passes through the s...

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Problems solved by technology

[0004] In order to solve the problem that the existing grating spectrum analysis optical system uses slits as the system diaphragm to make the energy utilization rate of the system low, the present invention proposes to use the optical fiber as the system diaphragm, and add a cylindrical lens in the optical path to increase the light wave in the optical path. The energy utilization rate in the system can improve the spectral resolution of the system at the same time. The optical system of the small cylindrical mirror multi-grating spectral analysis

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