An intelligent electronic device, a QXAFS (quick X-ray absorption fine structure) system and a data acquisition and motor control method

Abstract

The application discloses an intelligent electronic device, a QXAFS (quick X-ray absorption fine structure) system and a data acquisition and motor control method. The intelligent electronic device replaces a stepper motor controller and a scaler in a conventional XAFS (X-ray absorption fine structure) experimental system; and by employing a programmable device as a core component, the electronic device realizes analog acquisition via a multi-channel ADC acquisition circuit combining with a current amplifier in the quick XAFS system, or realizes integral form data acquisition by using the counting function of a programmable device combining a V / F converter on the quick XAFS system. The programmable device controls the stepper motor through reading a control curve configured in a RAM, while performs data acquisition in a control segment allowing the data acquisition, thus achieving a high-speed synchronization of the stepper motor and the data acquisition, and through sampling data in the stationary or slow control segment of the control curve, preventing energy movement in the process of data acquisition, and obtaining a best solution in the contradiction between a spectrum sweep speed and the energy movement.

Description

technical field [0001] This application relates to the modern material structure analysis method - synchrotron radiation experiment method, in particular to an intelligent electronic device dedicated to the Quick X-ray Absorption Fine Structure (QXAFS) experiment, a fast XAFS experiment system and Data acquisition and stepper motor control methods in a fast XAFS experiment implemented using this smart electronics device. Background technique [0002] The modern XAFS experimental system is a tool for large-scale material structure analysis and research based on synchrotron radiation devices. Its basic principle is to irradiate the sample to be studied with single-energy X-rays, and gradually change the energy of single-energy X-rays within a specific X-ray energy range. Energy scanning is realized, and the intensity of X-rays before and after the sample is detected at the same time, so as to obtain the absorption line of the sample in a specific energy range, and the microstr...

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Problems solved by technology

[0014] (1) Stepper motor controller and data acquisition device (such as figure 1 The current amplifier 105, V / F converter 106, scaler 107, etc.) are discrete devices, there is no synchronization interface between them, and they can only be synchronized through computer software, which is limited by the communication speed of the computer and peripherals, peripherals The built-in internal working mechanism, etc., cannot achieve fast synchronization, thus limiting the speed of spectrum acquisition

[0015] (2) In order to achieve fast scanning, the continuous mode is adopted in the QXAFS experiment process, that is, the data is collected while the stepping motor is moving, and there must be energy movement ΔE (that is, energy change) within the data collection time t of a single energy point, This causes data distortion, resulting in XAFS shock distortion

[0018] (5) There are time constants in the detection system, such as the reaction speed of the ionization chamber detector 103, the rise time of the current amplifier 105, etc., will affect the XAFS oscillation structure, resulting in distortion of the XAFS oscillation waveform and distortion of adjacent structure information

[0019] (6) Lost step and inaccurate stepping and sampling phases during the energy scanning process of the QXAFS experiment will cause the spectrum to be deformed on the energy axis, and also cause the XAFS oscillation waveform to be distorted, resulting in distortion of the adjacent structure information

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