Simplified digital corresponding Doppler broadening spectrum machine

Abstract

A simplified digital corresponding Doppler broadening spectrum machine is used for setting a digital Doppler broadening spectrum analysis drawing system in a computer. A high-pressure power source outputs high pressure of a high-purity germanium photoelectric detector. The high-purity germanium photoelectric detector receives positron annihilation radiation gamma photons and is used for converting optical energy into electric energy, outputting pulses which are in direct proportion to gamma light energy and then outputting the pulses to a digital acquisition card. The digital collection card is used for sampling the pulses, converting the pulses into digital signals and inputting the digital signals to the computer. After the pulses are analyzed and processed through a digital corresponding Doppler broadening spectrum analysis drawing system, corresponding Doppler broadening spectrum is drawn. The simplified digital corresponding Doppler broadening spectrum machine is little in parts, convenient to transport and very easy to assemble and use. Compared with a traditional corresponding Doppler broadening spectrum, the simplified digital Doppler corresponding broadening spectrum machine has better energy resolution and a counting rate and has lower total price, and therefore the simplified digital corresponding Doppler broadening spectrum machine has higher cost performance.

Description

[0001] technical field [0002] The invention relates to a Doppler broadening spectrometer, specifically, a simplified digital coincident Doppler broadening spectrometer comprising a computer, a digital acquisition card, and two oppositely arranged high-purity germanium photodetectors and a high-voltage power supply. spectrometer. [0003] Background technique [0004] Positron annihilation technique is a sensitive probe to characterize the microstructure of materials, and it has been widely used in the research of condensed matter materials. The positron Doppler broadening spectrum measurement method can reflect the electron momentum distribution at material defects, so it has become a conventional microstructure characterization method. The traditional coincident Doppler broadening spectrometer was first proposed and implemented by Lynn et al. in the United States in 1977. It has a higher peak-to-current ratio than the single-probe Doppler spectrometer, so it can be appli...

AI Technical Summary

Problems solved by technology

The main amplifier is used in the above coincidence digital Doppler stretching spectrometers to achieve pulse filter shaping or for external coincidence triggering. The main amplifier is mainly to improve the signal to noise ratio and amplify the signal to facilitate the resolution of the digital acquisition card. But it obviously increases the hardware cost and complexity of the system

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