Optoelectronic signal acquisition and conversion device for sensor used for detecting dust concentration

Abstract

The invention provides an optoelectronic signal acquisition and conversion device for a sensor used for detecting dust concentration, which belongs to the technical field of measuring electronics. The optoelectronic signal acquisition and conversion device comprises an I / V conversion circuit, a voltage amplifier circuit, a voltage follower circuit and a power lead-in and signal output circuit, wherein the output terminal of the power lead-in and signal output circuit is connected with the I / V conversion circuit, the voltage amplifier circuit and the voltage follower circuit, the output terminal of the I / V conversion circuit is connected with the voltage amplifier circuit, the output terminal of the voltage amplifier circuit is connected with the voltage follower circuit, the output terminal of the voltage follower circuit is connected with the power lead-in and signal output circuit, and the voltage amplifier circuit comprises resistors R1 and R4, capacitors C5 and C7, and a low-noise variable gain instrumentation amplifier U2. The optoelectronic signal acquisition and conversion device has the advantages of good working stability, strong anti-interference ability, accurate acquisition data, etc.

Description

technical field [0001] The invention belongs to the technical field of measuring electronics, and relates to a photoelectric signal acquisition and conversion device for detecting dust concentration sensors, in particular to a photoelectric signal acquisition and conversion device for optical dust concentration sensors. Background technique [0002] Underground coal mines have high dust content and harmful components. Workers who work in the dust environment for a long time are prone to pneumoconiosis; service life. The dust concentration sensor is a high-tech sensor developed by using the principle of laser scattering to meet the existing coal mine monitoring of underground dust concentration. The dust concentration sensor is mainly used in dust operation places such as mines and cement plants. It can continuously detect the concentration of floating dust in the environment where flammable, explosive and combustible gas mixtures exist. The underground monitoring shows the...

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Problems solved by technology

The underground environment of the coal mine is harsh, the light is very weak, the detection accuracy of ordinary photodiodes is poor, and the sensitivity is low. In addition, because the current signal collected is extremely small, it needs to be amplified by the amplifier circuit before it can be used by the lower circuit; and the photomultiplier tube has high sensitivity. It has low noise and cannot be irradiated by strong light. It is suitable for use in coal mines. It can convert weak light signals into electrical signals, but it needs to provide a higher voltage when used, which is likely to cause safety hazards in dusty workplaces. The cost is also higher

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