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DFWM (Degenerate Four-Wave Mixing) spectroscopic technology based method for determining date of cultural relics

A spectroscopic technique and a determination method technology, which is applied in the measurement of C14 isotope content based on degenerate four-wave mixing and the dating of cultural relics. Effects of background interference, improving signal-to-noise ratio, and simplifying equipment

Inactive Publication Date: 2011-02-09
NORTHWEST UNIV
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Problems solved by technology

The subsequent appearance of accelerator mass spectrometry has significantly improved the accuracy of dating. The improved proton accelerator method greatly reduces the amount of samples required and the error. Insufficient amount of sampling

Method used

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  • DFWM (Degenerate Four-Wave Mixing) spectroscopic technology based method for determining date of cultural relics
  • DFWM (Degenerate Four-Wave Mixing) spectroscopic technology based method for determining date of cultural relics
  • DFWM (Degenerate Four-Wave Mixing) spectroscopic technology based method for determining date of cultural relics

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Experimental program
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Embodiment Construction

[0024] Attached below figure 1 The present invention is further described.

[0025] See attached figure 1 As shown, the measuring device of the present invention is mainly composed of a laser 1 , a total reflection mirror 2 , a half-wave plate 3 , a polarization beam splitting cube 4 , a sample cell 5 , and a photodetector 6 . The measurement method is: according to the DFWM signal strength of the sample, its content information is obtained, and the age of the cultural relic is further calculated.

[0026] Specific steps:

[0027] (1) Place the half-wave plate 3 before the polarization cube 4, rotate the half-wave plate 3, and divide the linearly polarized laser light output by the laser 1 into two beams of linearly polarized laser light (reflected light) whose polarization directions are perpendicular to each other denoted as s light, and transmitted light as p light);

[0028] (2) the s light that step (1) obtains is divided into two beams again;

[0029] (3) add a half...

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Abstract

The invention discloses a DFWM (Degenerate Four-Wave Mixing) spectroscopic technology based method for determining the date of cultural relics, which comprises the following steps of: dividing a laser beam by a beam splitting device into three beams to be incident into a sample to be determined; receiving a generated DFWM signal by a photoelectric detector; measuring the intensity of the DFWM signal to judge the content information of 14C; and reckoning the date of the cultural relics based on the decay theory of the 14C according to the content information of the 14C. The invention has the advantages of simple device, easy and feasible operation, and capability of eliminating Doppler widening and can overcome the deficiencies of poor dating precision, high sampling amount, complicated device, high operation difficulty, high cost and the like in the traditional isotope-dating technology.

Description

technical field [0001] The invention relates to a method for determining the age of cultural relics, in particular to a method for measuring the content of carbon fourteen isotopes based on degenerate four-wave mixing (DFWM), which can eliminate Doppler broadening, reduce detection limits, and reduce sampling It belongs to the field of nonlinear spectroscopy technology application and isotope archeology 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 environmen...

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Application Information

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IPC IPC(8): G01N1/28G01N21/01G01N21/27
Inventor 任兆玉白晋涛程雪梅陈浩伟
Owner NORTHWEST UNIV
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