Method for reducing wide spectrum transmittance measurement error

A technology for measuring error and transmittance, applied in the field of spectral measurement, can solve problems that affect the measurement accuracy of spectrometers, limit the detection effect of high-precision spectrometers, and cannot accurately measure light energy signals, etc.

Pending Publication Date: 2020-10-27
BIAOQI ELECTRONICS TECH
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  • Summary
  • Abstract
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Problems solved by technology

[0011] Therefore, since the spectrometer itself always has random noise errors in the actual detection process, the spectrometer cannot accurately measure the actual light energy signal corresponding to the incident light passing through the sample to be tested, and can only obtain signal data with random noise errors. The noise signal of the spectrometer greatly affects the measurement accuracy of the spectrometer and limits the detection effect of the high-precision instrument of the spectrometer

Method used

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  • Method for reducing wide spectrum transmittance measurement error
  • Method for reducing wide spectrum transmittance measurement error
  • Method for reducing wide spectrum transmittance measurement error

Examples

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Embodiment 1

[0065] Taking liquid samples as an example, it is a method to reduce the measurement error of wide-spectrum transmittance. In the process of detecting the transmittance and absorbance of liquid samples, by changing the pulse frequency of the light source, the full wavelength of incident light corresponding to the sample to be tested is enhanced. spectral intensity.

[0066] Step S1. The reference cell in this embodiment is a solvent without any solute components. By switching the position of the sample cell to the reference cell before measuring the test light path containing the sample, the reference light path is measured first to obtain an unenhanced After the processed incident light passes through the reference sample, the signal intensity distribution of the full spectrum is measured by the spectrum, and then the unprocessed sample transmittance curve (such as image 3 Shown in (1)) and absorbance curve (such as image 3 shown in (2));

[0067] Step S2, switch the refe...

Embodiment 2

[0074] Taking liquid samples as an example, it is a method to reduce the measurement error of wide-spectrum transmittance. In the process of detecting the transmittance and absorbance of liquid samples, the full wavelength of incident light corresponding to the sample to be measured is increased by setting a chopper. Spectral intensity, in order to reduce the measurement error of the sample.

[0075] Step S1, the reference cell of this embodiment is a solvent that does not contain any solute components, by switching the position of the sample cell to the reference cell before measuring the test light path containing the sample, and measuring the reference light path first, to obtain After the enhanced incident light passes through the reference sample, the signal intensity distribution of the full spectrum is measured by the spectrum, and then the reference transmittance and absorbance curves are calculated by the signal processing system and the optical characteristic calculat...

Embodiment 3

[0084] Taking the optical filter as an example, it is a method to reduce the measurement error of the wide-spectrum transmittance. During the transmittance detection process of the optical filter, by setting the optical chopper, the full wavelength of the incident light corresponding to the sample to be tested is increased. Spectral intensity, in order to reduce the measurement error of the sample.

[0085] Step S1, by placing a reference filter on the position of the sample cell before measuring the test light path containing the sample, first measure the reference light path (air), so as to obtain the unenhanced incident light through the air and then measure it by the spectrum The signal intensity distribution of the full spectrum of ;

[0086] Step S2, switch the reference cell to the filter to be tested, use the chopper to adjust the intensity of the light source, and amplify the intensity of the light source of the filter to be tested by 10 times on the basis of the afor...

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Abstract

The invention relates to the technical field of spectral measurement, discloses a method for reducing a wide-spectrum transmittance measurement error, and particularly relates to a method for reducingthe transmittance measurement error of a sample by enhancing the spectral intensity of full wavelength of incident light and improving a measurement signal when the sample is detected. Starting fromlight transmittance definition, the detection principle of a spectrograph, the working principle of a light-emitting component and the like are integrated, the optical path does not need to be adjusted, a sample is not limited by the state, and solid and liquid can be used. By enhancing the full-wavelength spectral intensity of incident light, a higher sample transmission signal can be obtained, so the signal-to-noise ratio of the spectrograph is remarkably improved, and the measurement error of the sample transmittance is reduced. The method disclosed by the invention is not limited by the form of the sample and the spectrum detection range, is simple to operate and can be widely applied to wide-spectrum detection of various sample types.

Description

technical field [0001] The invention relates to the technical field of spectrum measurement, and more particularly, to a method for reducing measurement errors of wide-spectrum transmittance. Background technique [0002] In spectroscopic analysis, a typical spectrometer is mainly composed of an optical platform and a detection system, including the following main parts: [0003] 1. Incident slit: the object point of the spectrometer imaging system is formed under the irradiation of incident light; [0004] 2. Collimation element: make the optical fiber emitted by the slit into parallel light. The collimation element can be an independent transmission, reflection mirror, or directly integrated on the dispersion element, such as the concave grating in the concave grating spectrometer; [0005] 3. Dispersion element: Usually a grating is used to disperse the optical signal in space according to the wavelength, which is called multiple beams; [0006] 4. Focusing element: foc...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/25G01N21/59
CPCG01N21/31G01N21/255G01N21/59
Inventor 宋光均吴剑峰蒋之辉
Owner BIAOQI ELECTRONICS TECH
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