QXAFS electronics equipment

Abstract

The invention relates to QXAFS electronics equipment. The equipment comprises a measuring circuit, a data acquisition module, a data caching module, a logic control module, a motor control module and a data transmission module; the measuring circuit collects and processes a current signal of X-ray intensity generated by an X-ray detector in a QXAFS experiment, and the current signal is processed into a digital signal and then sent to the data collecting module; the digital signal is stored into the data caching module; the data caching module is connected with the logic control module, and the logic control module is connected with the data transmission module; the motor control module generates a motor control signal according to the instruction and controls a motor driver to rotate; the data transmission module obtains the digital signal from the data cache module through the logic control module and transmits the digital signal to the computer component; and the logic control module controls the data acquisition module, the data transmission module and the motor control module, so that the motor rotation and the data acquisition are kept in a synchronous relationship, and the measurement of a second-order or faster time-resolved XAFS spectrum can be realized through the equipment.

Description

technical field [0001] The present invention relates to a modern material structure analysis method-synchronous radiation experiment method, in particular to electronic equipment dedicated to Quick X-ray Absorption Fine Structure (QXAFS). Background technique [0002] The XAFS experimental method is a powerful tool for detecting the local structure of matter, and has the characteristics of element selectivity, no dependence on long-range order, and sensitivity to trace elements. One of the richest experimental methods. [0003] Conventional XAFS data acquisition adopts a step-by-step scanning mode, such as figure 1 shown. After the incident X-ray passes through the double-crystal monochromator, it becomes monochromatic light with adjustable energy; on the front, back and side of the sample, there are ionization chamber detectors and subsequent electronic equipment, including weak current amplifiers, VF The converter (VF converter) and the digital pulse counter (Counter) a...

AI Technical Summary

Problems solved by technology

[0009] (3) Generally, one-way scanning from low energy to high energy is adopted, and data acquisition is not performed when the motor returns

[0011] (1) The acceleration section, deceleration section and constant speed section of the scanning process need to be pre-configured and stored in the specified register. Due to the limited storage capacity of the register, the number of scanning points is limited, and a complete periodic round-trip bidirectional scanning process cannot be realized.

[0012] (2) The collected data is also pre-stored in the FIFO register. The stored data points are limited, and the data can only be combined by summing and averaging. Some details of the experimental process will be lost, and after the data is accumulated, it takes a one-time readout. seconds

[0013] (3) When outputting, the number of pulses sent to the motor and the collected data are not output synchronously, which will bring difficulties to the correction of the energy coordinates (calculated from the number of pulses) in the later stage, which may cause inconsistency with the actual coordinates and shift the spectral shape or deformation

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