Apparatus for measuring raster angle with linear CCD array to determine wavelength
A fixed wavelength and linear array technology, which is applied in the field of devices using linear array CCD to measure grating rotation angle and fixed wavelength, can solve the problems of belt pulley, stepping motor lost step, unable to solve the problem of screw and nut cooperation, time-consuming, etc., to speed up the measurement Speed, saving operation time of “resetting to zero” and easy to use
Inactive Publication Date: 2004-09-29
天津市耀辉光电技术有限公司
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Problems solved by technology
Obviously, this kind of spectrometer is time-consuming, and due to factors such as the zero-returning accuracy of the zero-returning device, the precision of the precision screw, the air return caused by the cooperation of the precision screw and the nut, the loss of steps of the stepping motor, and the slipping of the pulley, etc., spectral measurement errors will be introduced.
Although the latter method overcomes the defects of the former method of returning to zero and the shortcomings of pulleys and stepping motors, it still cannot solve the problem of the cooperation between the screw and the nut.
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[0016] Below according to accompanying drawing and principle the present invention will be described in further detail:
[0017] The principle of directly measuring the grating rotation angle with a linear array CCD device to measure the grating rotation angle and fix the wavelength is as follows: figure 1 As shown, the straight line AB in the figure is the mirror surface of the plane mirror fixed on the grating. A beam of rectangular parallel light is projected on the rotation axis O of the plane mirror, and a line array CCD (or a set of line array CCDs) is used to receive the reflected light in the direction of the reflected light (as shown by the straight line MP in the figure). The center line of the rectangular parallel light is on the CCD There is a one-to-one correspondence between the position information on the image plane and the rotation angle of the grating (that is, the blaze wavelength of the grating).
[0018] Let the angle between the traveling direction of th...
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An apparatus for determining wavelength by use of linear CCD array to measure the rotation angle of raster is composed of light source, reflector, splitting raster, linear CCD array, rotation angle measuring system, A / D data acquision card and computer. Said light source is arranged on a horizontal plane, where the image sensing plane of CCD array and planar reflector are on, to make the parallel light beam and the horizontal line have a certain angle. The planar reflector is parallel to raster plane. Said spectral wavelength is calculated out according to the measured rotation angle of raster. Its advantages are high precision and higher speed.
Description
technical field [0001] The invention belongs to measuring and analyzing instruments, and more specifically relates to a device for measuring the rotation angle of a grating and determining the wavelength by a linear array CCD. Background technique [0002] Various existing grating spectroscopy instruments often use a sine tracing mechanism composed of a stepping motor and a precision lead screw to drive the grating to rotate, and measure the rotation angle of the grating by recording the number of steps the stepping motor rotates and combining the pitch of the precision lead screw , to determine the spectral wavelength on the spectrum surface. In addition, there are also micro-displacement systems such as a grating ruler or a capacitive grating ruler installed on the lead screw. By measuring the rotation amount of the sinusoidal scanning mechanism and then calculating the rotation angle of the grating, the wavelength of the spectrum is measured. ...
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IPC IPC(8): G01J3/18G01J3/28
Inventor 王庆有张盛彬
Owner 天津市耀辉光电技术有限公司