Infrared source circuit of carbon-sulfur determination analyzer

Abstract

The invention discloses an infrared source circuit of a carbon-sulfur determination analyzer, which comprises a constant current source Darlington pipe drive circuit, an infrared source and a direct current supply, wherein the constant current source Darlington pipe drive circuit is provided with a pulse signal input end, the constant current source Darlington pipe drive circuit is connected with one end of the infrared source, and the direct current supply is connected with the other end of the infrared source. The infrared source of the circuit is driven by the constant current source Darlington pipe drive circuit to realize the modulation of the infrared source, thereby saving the cost and the structure space of a chopping motor, simplifying the system design and more easily realizing the modulation of the infrared source; the adoption of electrical modulation has the largest advantages of no movable members, more stable radiation of the infrared source for the outside, high system accuracy, long life and low cost.

Description

technical field [0001] The invention relates to an infrared light source circuit, in particular to an infrared light source circuit for a carbon and sulfur determination analyzer. Background technique [0002] Carbon determination and sulfur determination analyzer is a commonly used analytical instrument for analyzing carbon and sulfur content in substances, and can quickly analyze steel, cast iron, copper, alloy, ore, cement, ceramics, carbon compounds, minerals, coal, coke , petroleum, ash, catalyst, lime, gypsum, soil, rubber, leaves, soot, garbage, sand, glass and other solid and fluid materials, are widely used in scientific research, production and processing, etc. field. [0003] The principle of the commonly used carbon and sulfur determination analyzer is mainly to heat and melt the solid powder sample to be tested in an environment of pure oxygen, so that the carbon and sulfur in the sample will react with oxygen to form carbon dioxide and sulfur dioxide. The fo...

AI Technical Summary

Problems solved by technology

The biggest disadvantage of using mechanical chopping is that there are rotating parts, and the motor has a life limit

In addition, to make the chopping light of the chopper uniform and stable, the motor speed of the chopper is required to be uniform and constant, which is usually difficult to achieve

The unstable motor speed will affect the fluctuation of the chopping signal, thus affecting the stability of the whole machine

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