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Process of applying white light interference system in measuring variable light absorbing wavelength of spectrophotometer

A spectrophotometer, white light interference technology, applied in the direction of color/spectral characteristic measurement, measuring device, using optical device, etc., can solve the problem of inaccurate distribution, etc., and achieve the effect of large range and high precision

Inactive Publication Date: 2007-10-03
DALIAN UNIV OF TECH
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Problems solved by technology

However, according to theoretical analysis and experimental results, the optimal absorbance value of 0.5 for some liquids often cannot be accurately distributed within these relatively fixed length ranges. Optimal absorbance value

Method used

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  • Process of applying white light interference system in measuring variable light absorbing wavelength of spectrophotometer
  • Process of applying white light interference system in measuring variable light absorbing wavelength of spectrophotometer
  • Process of applying white light interference system in measuring variable light absorbing wavelength of spectrophotometer

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Embodiment Construction

[0027] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0028]Build the optical path as shown in Figure 1, put the liquid to be tested into the sample cell, and then start the white light interferometry system under the control of the single-chip microcomputer shown in Figure 2 to obtain the white light interferograms shown in Figure 3 and Figure 4. The electronic counter under the control of the single-chip microcomputer measures the rectangular pulse width after fringe shaping, and then takes the intermediate value to determine the central fringe position of the white light interferogram, which is the initial position of the liquid surface to be measured. Take the measured white light interferogram shown in Figure 4 as an example, the abscissa in Figure 4 is the number of steps of the stepping motor, and the single-step resolution of the stepping motor used is 1.25 μm / s...

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Abstract

The present invention belongs to the field of chemical analysis instrument technology, and is process of applying white light interference system in measuring variable light absorbing wavelength of spectrophotometer. When the white light Michelson interference system is used in spectrophotometer, optimal absorbance value is first set, the amount of the sample is controlled to alter the absorption wavelength of the measured liquid, and the absorption wavelength is then calculated based on the upper surface position change of the measured liquid to complete the quantitative analysis on the measured liquid. The present invention has the advantages of wide measurement range, high precision, and capacity of directly measuring the absorbance index or concentration of liquid.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis instruments, and relates to a method for measuring variable light absorption length in a spectrophotometer using a Michelson white light interference system. Background technique [0002] A spectrophotometer is a commonly used chemical analysis instrument. Based on Beer's law, it usually uses the method of comparing the optical parameters of the sample cell to be tested with the reference cell to perform related qualitative or quantitative analysis. [0003] Spectrophotometers currently widely used all use a sample absorption cell with a fixed absorption length (such as the most common 1 cm cell). In order to obtain the best signal-to-noise ratio and higher analysis accuracy, both experience and theoretical derivation have proved , the optimum range of absorbance should be around 0.5. We know that absorbance = absorbance index X sample concentration X absorbance length, for a given liqu...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01B11/02
Inventor 孙长森孙昱星丁建华
Owner DALIAN UNIV OF TECH
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