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Front end signal conditioning circuit of light blockage method imager

A front-end signal and conditioning circuit technology, applied in scientific instruments, measuring devices, particle size analysis, etc., can solve the problems of little concern for particle images and only focus on particle dimensions, to solve the problem of slow response speed, improve anti-noise performance, good adaptability

Inactive Publication Date: 2017-03-29
何志杰
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  • Abstract
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  • Application Information

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Problems solved by technology

The detection technology based on the photoresistance method is widely used in the fields of aerospace gasoline, medicine, meteorology and the environment, but it is mainly used in low-speed measurement occasions, and there is little mention of high-speed particle measurement, and the measurement only pays attention to the particle size. Dimensions, cares little about particle images

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  • Front end signal conditioning circuit of light blockage method imager
  • Front end signal conditioning circuit of light blockage method imager
  • Front end signal conditioning circuit of light blockage method imager

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with drawings and embodiments.

[0017] Such as figure 1 , under laser irradiation, the physical quantity generated by the photodiode array is current, and the processing quantity of general signals is voltage, so it is necessary to convert the current generated by the sensor into voltage before processing the signal. To design a current-to-voltage circuit (I / V circuit) is to design a transimpedance amplifier.

[0018] The transimpedance amplifier circuit in the front-end signal conditioning circuit adopts advanced compensation technology to compensate the phase to ensure that the circuit still has sufficient phase margin when working under any loop gain condition. The feedback capacitor Cr is connected to both ends of the feedback resistor E. It forms a noise gain pole with Rr. An appropriate Cr value can make the noise gain pole offset the loop gain pole, so that the phase margin of the circuit reac...

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Abstract

A front end signal conditioning circuit of a light blockage method imager is composed of a transresistance amplifying circuit, a backward-stage amplifying circuit, a voltage dividing emitter follower circuit and a comparator circuit. The front end signal conditioning circuit is capable of effectively processing signals generated by a sensor and generating effective signals which meet the particle size and are suitable for actual application, compact in structure, high in response speed, high in adaptability and capable of being used for particle imaging measurement on high-speed occasions.

Description

technical field [0001] The invention relates to a front-end signal conditioning circuit of a photoresistance method imager, which is suitable for the field of imaging measurement of high-speed moving particles by the instrument. Background technique [0002] The Light-Blockage method, also known as the Light-Blockage method or the Light-blocking method, is a method for detecting the particle size by using the light intensity change caused by the blocking of the light by the particles. The detection range can range from wm to mm. class. The principle of photoresistance method imaging measurement is mainly to use a collimated laser beam with uniform light intensity distribution to directly irradiate the photodiode array of the sensor. Each sensor unit generates a current value proportional to the intensity of the laser light it receives. When particles pass through the laser beam area, the intensity of the laser light irradiated on the photodiode array of the sensor changes ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02
Inventor 何志杰
Owner 何志杰