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公开(公告)号：US11150132B2
公开(公告)日：2021-10-19
申请号：US16872856
申请日：2020-05-12
Applicant: Zolix Instruments Co., Ltd.
Inventor： Hongtai Cai , Haixia Chen
Abstract: The present disclosure provides a grating rotation method and apparatus for improving spectrograph wavelength accuracy. The grating rotation method comprises: acquiring a start wavelength and an end wavelength of a scanning range; determining a start angle and an end angle of a grating rotation according to preset grating rotation angle series values, the start wavelength and the end wavelength, wherein a wavelength corresponding to the start angle is smaller than the start wavelength, and a wavelength corresponding to the end angle is larger than the end wavelength; and rotating the grating according to the start angle and the end angle to obtain required spectral information. According to the grating rotation scheme provided by the present disclosure, the problem that the obtained spectral accuracy is inconsistent due to different grating rotation angles can be avoided.
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公开(公告)号：US20250085164A1
公开(公告)日：2025-03-13
申请号：US18773672
申请日：2024-07-16
Inventor： Zemin Lei , Fei Tong , Suxia Zhang , Haixia Chen
Abstract: A wavelength calibration method for a grating spectrometer is provided, including: moving a plurality of characteristic peaks of a calibration light source to a central position of a detector of the spectrometer respectively, and determining a functional relationship between a grating rotation angle of the rotatable grating and a central wavelength; and determining parameters γ, f, a, b, c in the following physical model, the physical model being used to calculate a corresponding wavelength at each pixel within an imaging range of the detector when the central wavelength is determined, λ ′ = sin ( Ψ - γ 2 ) + sin ( Ψ + γ 2 + arctan ( a ( n x ) 2 + b ( n x ) + c f ) ) 1 0 - 6 · m · N wherein Ψ is the grating rotation angle corresponding to the central wavelength as determined via the functional relationship, γ is built-in angle of the spectrometer, f is a focal distance of the spectrometer, m is grating diffraction order, N is the number of grating rulings (unit: line/mm), nx is a distance between a corresponding pixel and a central pixel.
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公开(公告)号：US20210199502A1
公开(公告)日：2021-07-01
申请号：US16872856
申请日：2020-05-12
Applicant: Zolix Instruments Co., Ltd.
Inventor： Hongtai Cai , Haixia Chen
Abstract: The present disclosure provides a grating rotation method and apparatus for improving spectrograph wavelength accuracy. The grating rotation method comprises: acquiring a start wavelength and an end wavelength of a scanning range; determining a start angle and an end angle of a grating rotation according to preset grating rotation angle series values, the start wavelength and the end wavelength, wherein a wavelength corresponding to the start angle is smaller than the start wavelength, and a wavelength corresponding to the end angle is larger than the end wavelength; and rotating the grating according to the start angle and the end angle to obtain required spectral information. According to the grating rotation scheme provided by the present disclosure, the problem that the obtained spectral accuracy is inconsistent due to different grating rotation angles can be avoided.
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