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Degenerate four-wave mixing spectroscopic technology-based method for determining historical relic producing area

A technology of four-wave mixing and spectral technology, which is applied in the field of cultural relic origin measurement based on degenerate four-wave mixing (DFWM) spectral technology, can solve the problem of non-destructive and near-non-destructive testing, which cannot be widely used, and the consumption of mass spectrometry technology. Large sample volume and other problems, to avoid background interference, avoid the same weight interference, reduce the effect of sampling

Inactive Publication Date: 2013-06-26
NORTHWEST UNIV
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AI Technical Summary

Problems solved by technology

However, mass spectrometry has many disadvantages, such as high cost, complicated sample pretreatment, and long detection time.
Mass spectrometry consumes a large amount of sample (microgram level), which makes it far from meeting the requirements of non-destructive and near-non-destructive testing, such as precious cultural relics, etc.
Another fatal flaw of mass spectrometry is the interference of isobaric elements, which makes many isotopes unable to be resolved and the accuracy is low (Dominic Lariviere, Vivien F. Taylor, R. Douglas Evans, R. Jack Cornett. Spectrochimica. Acta Part B 2006 , 61 877.)
Since there is no effective method for determining the lead isotope ratio at present, the method of measuring the origin of cultural relics by the lead isotope ratio cannot be widely used

Method used

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  • Degenerate four-wave mixing spectroscopic technology-based method for determining historical relic producing area
  • Degenerate four-wave mixing spectroscopic technology-based method for determining historical relic producing area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Prepare the test device as follows:

[0028] The laser is selected to emit a laser whose central frequency is the same as the resonance frequency of the energy level of the lead atom. The laser line width is smaller than the spectral interval of the lead atom isotope, and the laser can be continuously tuned near the energy level resonance frequency of the lead atom isotope. Specifically, a continuously tunable narrow-bandwidth ring dye laser or a semiconductor laser is selected.

[0029] There are 6 identical all-reflective mirrors. According to the frequency of the laser emitted by the laser, the all-reflective mirrors are coated with a 45° high-reflection film (>99%) in the laser frequency range.

[0030] 3 identical half-wave plates, choose the half-wave plate applicable to the laser frequency range.

[0031] There are 4 identical polarization beam-splitting cubes, and the polarization beam-splitting cube applicable to the laser frequency range is selected.

[0032...

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Abstract

The invention discloses a method for determining the origin of cultural relics based on DFWM spectrum technology: dissolving the cultural relics to be tested with 1% nitric acid solution, and converting lead compounds in the lead-containing cultural relics to be tested into lead atoms. Divide a laser beam into three beams with equal optical paths, and adjust the spatial positions of the three beams. A sample of lead atoms to be measured is set at the intersection of the three beams of light, and the three beams of light interact with the lead atoms together to generate a DFWM signal. Obtain the DFWM signal spectrum of the lead atom. The types of lead isotopes were analyzed according to the DFWM signal spectrum, and the concentration ratio between lead isotopes was obtained. Comparing the lead isotope concentration ratio with the mineral material lead isotope standard ratio, analyze and deduce the origin of the cultural relics and the source of the mineral material. The method of the invention can improve the isotope detection sensitivity, reduce the detection limit, reduce the sampling amount, and realize near-nondestructive detection, and the technical equipment is simple, easy to operate, and has ultra-high sensitivity and detection accuracy.

Description

technical field [0001] The invention belongs to the category of nonlinear spectral technology application and scientific and technological archaeology, and relates to a method for measuring the origin of cultural relics, in particular to a method for measuring the origin of cultural relics based on degenerate four-wave mixing (DFWM) spectral technology. Background technique [0002] my country is an ancient civilization with a long history, with rich and colorful and precious cultural heritage, and there are extremely rich cultural relics preserved above and below ground. These historical relics not only contain the unique spiritual value of the Chinese nation, but also are non-renewable precious resources and the crystallization of national wisdom. In recent years, with the trend of economic globalization and the acceleration of the modernization process, my country's cultural heritage and its living environment have been seriously threatened, and it is urgent to strengthen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/27
Inventor 任兆玉程雪梅白晋涛苗一珠陈浩伟
Owner NORTHWEST UNIV
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