Bidirectionally excited spark light source with high repetition frequency

Abstract

The invention discloses a bidirectionally excited spark light source with high repetition frequency. The bidirectionally excited spark light source comprises a light-guide fiber signal input interface circuit, a double-pulse train generating circuit and a bidirectionally excited high-voltage spark ignition circuit; the light-guide fiber signal input interface circuit is connected with a master control circuit; and one end of the light-guide fiber signal input interface circuit is electrically connected with an input end of an alternating-current power supply, the other end of the light-guide fiber signal input interface circuit is electrically connected with the double-pulse train generating circuit, the light-guide fiber signal input interface circuit is used for being controlled by an external controller and drives the double-pulse train generating circuit, the double-pulse train generating circuit is used for generating thyristor trigger pulses with fixed repetition frequency, the other end of the double-pulse train generating circuit is electrically connected with the bidirectionally excited high-voltage spark ignition circuit, an output end of the bidirectionally excited high-voltage spark ignition circuit is grounded, and another output end of the bidirectionally excited high-voltage spark ignition circuit is electrically connected with a high-voltage end. The bidirectionally excited spark light source has the advantages that interference of a spark excitation circuit to a control circuit of a system is effectively eliminated, the bidirectionally excited spark light source is beneficial to improving the ignition reliability, and the analytic precision of the light source is improved advantageously.

Description

technical field [0001] The invention belongs to the technical field of spectrum analysis, and is especially suitable for a special direct-reading spark spectrometer. Background technique [0002] The high repetition rate spark light source has the advantages of high sensitivity of the arc light source and high precision of the spark light source, and still has application value in direct analysis and on-site analysis applications. At present, there are two main methods for domestic instruments to produce high repetition frequency spark discharge: the classic method and the modern digital energy-adjustable spark light source. The main disadvantage of the classic method is that the polarity of the ignition spark discharge is unidirectional, which limits its reliability in the application of AC low-voltage spark discharge; and its high-voltage transformer is directly coupled to the analysis gap, and the discharge speed is limited, which cannot meet higher requirements. Require...

AI Technical Summary

Problems solved by technology

The main disadvantage of the classic method is that the polarity of the ignition spark discharge is unidirectional, which limits its reliability in the application of AC low-voltage spark discharge; and its high-voltage transformer is directly coupled to the analysis gap, and the discharge speed is limited, which cannot meet higher requirements. Repeat frequency requirements; and the ignition spark energy cannot be guaranteed to be stable, further limiting its application range

Although modern digital energy-tunable light sources can accurately control the spark discharge energy according to the properties of specific samples, they still belong to one-way spark discharge, and the analytical performance of the light source is not as good as that of two-way spark discharge.

At the same time, this system has a complex structure and low reliability, and is not suitable for operating in a relatively harsh environment, and is subject to certain restrictions in field analysis applications

[0003] In addition, most spark light source systems are directly connected to external controllers through direct signals, and the spark light source circuit itself is a serious source of electromagnetic interference, so there is a possibility of interference to the control circuit

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