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Method for correcting scanning wavelength mechanical position error of monochromator

A calibration method and monochromator technology, applied in the directions of spectrometry/spectrophotometry/monochromator, instruments, measuring devices, etc., can solve the problems such as the inability to meet the wavelength accuracy of the instrument and the large wavelength scanning error.

Inactive Publication Date: 2017-03-15
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art, to provide a wavelength correction method based on the variable parameter solution of the mechanical position error equation, hard adjustment and soft repair, so as to solve the problems caused by the optical zero position of the grating scanning mechanism of the monochromator. The wavelength scanning error caused by the error and the roller guide error is large and cannot meet the problem of the wavelength accuracy of the instrument. The correction method of the mechanical position error equation of the monochromator scanning wavelength to improve the wavelength accuracy of the instrument

Method used

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  • Method for correcting scanning wavelength mechanical position error of monochromator
  • Method for correcting scanning wavelength mechanical position error of monochromator
  • Method for correcting scanning wavelength mechanical position error of monochromator

Examples

Experimental program
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Effect test

Embodiment 1

[0076] Sine scanning monochromator mechanical position error correction.

[0077] Build a spectral scanning measurement experimental platform such as image 3 As shown, it consists of a standard light source, a spectral scanning control measurement system and a host computer. The standard light source can be a laser, a mercury lamp, etc., which can provide the corresponding standard wavelength within the spectral range of the monochromator, and fix it at the incident slit of the monochromator or spectrometer splitting system, so that the incident light can fill the monochromator or The collimating mirror of the spectrometer's beam splitting system. The spectral scanning control measurement system is located at the exit slit of the monochromator, and controls the stepper motor to continuously rotate the angle at a certain angular interval, so that the monochromator outputs optical signals of different wavelengths at a certain wavelength interval and range; at the same time, it...

Embodiment 2

[0097] Sine scanning spectrometer mechanical position error correction.

[0098] The structure of the sinusoidal scanning spectrometer is as follows: Figure 5 As shown, the light source and modulator are fixed outside the incident slit of the spectroscopic system (that is, the monochromator), and the relationship between the light source and the incident slit forms an object image, and the detection and control system is respectively connected with the spectroscopic system, sensor module, and host computer. At the same time, the spectroscopic system is connected with the sensor module through the sampler to form a spectrometer. The structure of the spectroscopic system is as figure 1 A sinusoidal sweep mechanism is shown.

[0099] The implementation process of the correction method for the wavelength error caused by the mechanical position error of the spectroscopic scanning mechanism of the sinusoidal scanning spectrometer is as follows: Figure 4 shown, including:

[01...

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Abstract

The invention relates to a method for correcting a scanning wavelength mechanical position error of a monochromator, and the method comprises the step: correcting the wavelength scanning error, caused by the mechanical position error, of a raster scanning mechanism of the monochromator or a spectrograph through the standard spectrum provided by a standard light source or a standard sample and the standard spectrum collection, equation parameter solving, optimal solution searching and hard regulation and soft correction of a variable rod length. The method which employs the optimal solution searching to determine the optimal rod length and correcting an initial wavelength carries out the effective correction of the scanning wavelength error of the monochromator or spectrograph of a raster sine scanning type. The method corrects the initial wavelength on software, compensates for the scanning mechanical position error of the monochromator, solves problems, caused by an optical zero position error and a roller guide error, that the raster scanning mechanism of the monochromator is large in wavelength scanning error and cannot meet the requirements of the wavelength of an instrument, and improves the accuracy of the wavelength of the instrument. The method combines hardware and software, is simple and feasible, and is suitable for the wavelength correction of a monochromator or spectrograph product during verification and debugging.

Description

technical field [0001] The invention relates to a method for correcting the position error of a monochromator scanning mechanism combined with software and hardware, in particular to a method for correcting the wavelength error of a grating sinusoidal scanning monochromator or spectrometer. Background technique [0002] The scanning transmission mechanism of the raster scanning monochromator mostly adopts a sinusoidal mechanism driven by a precision screw nut and a swing rod. Driven by a stepping motor, the screw rotates, the nut moves, and the nut guide pushes the roller to move, driving the swing rod to swing. The grating of the monochromator is continuously rotated, and the monochromator outputs monochromatic light with a linearly changing wavelength. [0003] The installation error of the scanning mechanism of the raster scanning monochromator includes the optical zero position error and the guide error of the pendulum roller. The light zero position refers to the posit...

Claims

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Application Information

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IPC IPC(8): G01J3/28
CPCG01J3/28G01J2003/2879
Inventor 王智宏刘杰陈琛张福东于永千承辉
Owner JILIN UNIV
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