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Data collection method based on monochromator quick-scanning control system

A technology of control system and data acquisition, applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of restricting widespread use and long measurement time.

Inactive Publication Date: 2012-08-01
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

According to the above energy point-by-point scanning method, since the sampling time of each energy point needs several seconds, one XAFS spectrum sampling needs 300-500 energy points, and it takes 20-60 minutes to measure one XAFS spectrum, which is greatly restricted due to the long measurement time its extensive use in experimental

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  • Data collection method based on monochromator quick-scanning control system
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  • Data collection method based on monochromator quick-scanning control system

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Embodiment Construction

[0028] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.

[0029] See attached image 3 , the monochromator fast scanning control system is composed of a beamline station 1 and an experiment station 2, and the beamline station 1 includes: a monochromator 306, a motor 307, a motor driver 308, a motor controller 309, a motor controller host 310 and an encoder 311. The experiment station 2 includes: a front ionization chamber 301 , a rear ionization chamber 302 , a high voltage power supply (not shown in the figure), a current amplifier 303 , an ADC 304 and a computer 305 .

[0030] The XAFS spectrum is composed of multiple data points with the absorption coefficient on the ordinate and the energy value on the abscissa. The present invention provides a data collection method based on a fast scanning control system of a monochromator, which is used...

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Abstract

The invention provides a data collection method based on a monochromator quick-scanning control system, which is used for quickly obtaining an XAFS (X-ray Absorption Fine Structure) spectrum. The method comprises the following steps of: 1, initiating the monochromator quick-scanning control system, wherein the step of setting the rotation speed w of a monochromator is performed; 2, rotating the monochromator to an initial energy point, and starting an ADC (Analog To Digital Converter); 3, making the monochromator rotate at the constant rotation speed w continuously and the ADC carry out continuous sampling at a constant speed, carrying out synchronous processing on the data collected by the ADC to obtain the XAFS spectrum, and synchronously outputting the XAFS spectrum; and 4, stopping the rotation of the monochromator after the monochromator rotates to a final energy point, and stopping the sampling of the ADC. According to the data collection method based on the monochromator quick-scanning control system, provided by the invention, the XAFS spectrum is obtained by the continuous rotation of the monochromator and the continuous sampling of the ADC, the sampling time is greatly saved, the measuring efficiency is increased, and more importantly, a time-resolved XAFS test can be carried out.

Description

technical field [0001] The invention relates to a method for collecting XAFS spectra, in particular to a data collection method based on a fast scanning control system of a monochromator. Background technique [0002] Since the construction of the first synchrotron radiation source, synchrotron radiation technology has become an important experimental technology in scientific research. With the development of synchrotron radiation technology, the X-ray absorption fine structure spectroscopy (XAFS spectrum) system has also been developed rapidly. The XAFS spectrum requires two aspects of information, one is the energy value of monochromatic light, generally taken as -200-1000eV, and the other is the absorption coefficient of a certain substance corresponding to this energy value. The synchrotron radiation beamline station uses a monochromator to obtain monochromatic X-rays. The monochromator turns the incident white light into monochromatic light when it exits by changing th...

Claims

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Application Information

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IPC IPC(8): G01N23/00
Inventor 顾颂琦黄宇营姜政魏向军邹杨李丽娜高倩张硕李炯王建强
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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