High-resolution double-grating monochromator optical path apparatus

Abstract

The invention belongs to the field of spectrum measurement instruments. In order to provide a monochromator having characteristics of simple structure and small size and meeting a high resolution requirement, the technical scheme adopted by the invention is a high-resolution double-grating monochromator optical path apparatus, wherein the structure comprises an optical circulator, an optical fiber signal input port, an incident optical fiber port, a collimating and focusing lens, a grating 1, a grating 2, a grating rotation mechanism and an emergent optical fiber port, the optical fiber signal input port is connected to the first port of the optical circulator, an optical signal passes through the second port of the optical circulator, enters a free space from the incident optical fiber port, is collimated by a cemented doublet, and then irradiates on the grating 1 so as to produce first diffraction, the grating 1 diffracts the optical signal onto the grating 2 to produce second diffraction, the grating 2 diffracts the optical signal to the grating 1 according to the original path to perform third diffraction, and the third diffracted light returns to the cemented doublet according to the incident angle of the first diffraction. The high-resolution double-grating monochromator optical path apparatus of the present invention is mainly used for the design and the manufacture of spectrum measurement instruments.

Description

technical field [0001] The invention belongs to the field of spectrum measuring instruments, and relates to an electromechanical system, an optical element, and a photoelectric measuring system, in particular to a high-resolution double grating monochromator optical path device. Background technique [0002] Spectral measuring instruments are widely used in various fields, such as color measurement, concentration detection of chemical components or electromagnetic radiation analysis. Spectroscopic instruments generally include incident slits, collimating mirrors, dispersive elements (gratings or prisms), focusing optics and detectors. In monochromators, an exit slit is usually included, allowing a very narrow portion of the entire spectrum to irradiate onto a single-pixel detector. The entrance and exit slits in a monochromator are often fixed, and the entire spectrum is scanned by rotating the grating. It is the basic equipment for observing, analyzing and processing the ...

AI Technical Summary

Problems solved by technology

The spectrometer with this structure requires multiple collimating and focusing mirrors. At the same time, in order to achieve the purpose of screening wavelengths, two gratings must be rotated precisely at the same time. The instrument is bulky, complex in structure, and difficult in electromechanical control.

If a higher resolution is to be achieved, a third monochromator light path must be cascaded, and the volume and complexity of the entire instrument will become unacceptable

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