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Measuring method of absorption spectrum for eliminating ambient stray light interference

A technology of absorption spectrum and measurement method, which is applied in the field of absorption spectrum measurement to eliminate environmental stray light interference, can solve the problems of inconvenient measurement, interference, measurement conditions and high environmental requirements, etc., to avoid interference, high-precision measurement, and expand the scope of application Effect

Inactive Publication Date: 2011-04-27
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Measuring the absorption spectrum of a solution or a substance is the most common method to analyze its composition or structure, but the ambient stray light will interfere with the absorption spectrum during the measurement process, so the conventional measurement is carried out in a closed measurement chamber of the instrument, so it is difficult for The measurement conditions and environmental requirements are relatively high, and it is not convenient to measure in the field or under some special conditions

Method used

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  • Measuring method of absorption spectrum for eliminating ambient stray light interference
  • Measuring method of absorption spectrum for eliminating ambient stray light interference
  • Measuring method of absorption spectrum for eliminating ambient stray light interference

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Embodiment 1: as figure 1 As shown, the light beam emitted by the light source 1 passes through the chopper 2, and the output light is modulated according to the first preset frequency. The modulated light is irradiated onto the sample dish 4 through the slit 3, and the light beam passing through the sample dish 4 is obtained. , the light beam enters the first optical fiber 5 and is transmitted to the spectrometer 6. Under the control of the computer 7, the light beam is continuously sampled at a second preset frequency n times higher than the first preset frequency to obtain the absorption spectrum sequence of the surface of the measured object S i , in chronological order, in the computer 7 the absorption spectrum sequence S i The data corresponding to the same wavelength in Sorting to obtain the light intensity sequence of each wavelength, and performing Fourier transform on the light intensity sequence of each wavelength to obtain its maximum harmonic component ...

Embodiment 2

[0047] Embodiment 2: as figure 2 As shown, the light beam emitted by the light source 1 passes through the chopper 2, and the output light is modulated according to the first preset frequency, and the modulated light is irradiated onto the sample dish 4 through the second optical fiber 8, and the light passing through the sample dish 4 is obtained. The light beam enters the first optical fiber 5 and is transmitted to the spectrometer 6. Under the control of the computer 7, the light beam is continuously sampled at a second preset frequency n times higher than the first preset frequency to obtain the absorption spectrum of the surface of the measured object Sequence S i , in chronological order, in the computer 7 the absorption spectrum sequence S i The data corresponding to the same wavelength in Sorting to obtain the light intensity sequence of each wavelength, and performing Fourier transform on the light intensity sequence of each wavelength to obtain its maximum harmon...

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Abstract

The invention discloses a measuring method of an absorption spectrum for eliminating ambient stray light interference, which comprises the following steps of: enabling a light beam emitted by a light source to pass through a chopper, and demodulating the light according to a first preset frequency to obtain demodulated light; irradiating the demodulated light to a sample vessel to obtain a light beam penetrating through the sample vessel; enabling the light beam to enter a first optical fiber to be transmitted to a spectrograph; continuously sampling the light beam by the spectrograph under the control of a computer according to the second preset frequency to obtain an absorption spectrum sequence Si of the surface of an object to be measured; in the computer, sequencing data corresponding to the same wavelength in the absorption spectrum sequence Si according to the time sequence to obtain a light intensity sequence of each wavelength; in the computer, carrying out Fourier transform on the light intensity sequence of each wavelength to obtain the maximum harmonic component; and in the computer, sequencing the maximum harmonic component according to each wavelength sequence to obtain an absorption spectrum. The absorption spectrum eliminates the ambient stray light interference and has larger application range.

Description

technical field [0001] The invention relates to the measurement of absorption spectrum, in particular to an absorption spectrum measurement method for eliminating the interference of ambient stray light, which can quickly and accurately measure the absorption spectrum of solutions or substances. Background technique [0002] Measuring the absorption spectrum of a solution or a substance is the most common method to analyze its composition or structure, but the ambient stray light will interfere with the absorption spectrum during the measurement process, so the conventional measurement is carried out in a closed measurement chamber of the instrument, so it is difficult for The measurement conditions and environmental requirements are high, and it is not convenient to measure in the field or under some special conditions. Contents of the invention [0003] In order to avoid the interference of ambient stray light, expand the scope of application, and measure the absorption ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01J3/42
Inventor 林凌李刚
Owner TIANJIN UNIV
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