High-voltage constant current source for glow

Abstract

The invention discloses a high-voltage constant current source for glow, belonging to the field of metal material spectroscopy analysis instruments and comprising three parts, i.e. an excitation control system, a negative high voltage generation system and a constant current control system. The excitation control system is connected with the negative high voltage generation system by two sets of optical fiber transmit-receive terminals and two optical fibers, and the excitation control system transfers pulse signals into optical signals and then transmits the optical signals to the negative high voltage generation system when the glow excites samples; and the negative high voltage generation system and the constant current control system are directly connected by four leads resisting high voltage of 5kV and one shielding conductor. Direct current high voltage generated by the negative high voltage system and a glow source are connected in series for exciting the samples. The constant current control system samples current flowing through a glow load and transmits the sampled current to a feedback control circuit to control the current so as to realize the constant current. In the invention, a Grimm type glow discharge cavity excites a metal material by using the high-voltage constant current source, the excitation is stable and reliable, and the shape and the appearance of a sputtering pit are normal. The current is continuously adjusted within the working range of 0-50mA, the working range of voltage is -2,500-0V, and the precision of the current can be up to 1%.

Description

technical field [0001] The invention belongs to the field of spectral analysis instruments for metal materials, and in particular provides a high-voltage constant current source for glow, which is used as an excitation power source for spectral analysis instruments for metal materials. Background technique [0002] In the field of metal analysis, glow discharge analysis is the most ideal method for concentration analysis and surface analysis. The high-voltage power supply part of the glow discharge is an important part of the glow spectrometer, and the technical indicators of the glow spectrometer are largely affected by the stability of the glow excitation power supply. Currently, only three foreign companies: SPECTRUMA, JY, and LECO have commercial glow spectrometers, and there is no commercial glow spectrometer in China. Among them, SPECTRUMA and LECO are DC power supply sources, and their power supply sources are constant voltage sources. [0003] The use of constant v...

AI Technical Summary

Problems solved by technology

[0004] During the excitation process of the glow spectrometer, since the sputtered metal sample may be deposited on the anode, it is easy to cause a short circuit,

Images