Method and device for counting insoluble particles

Abstract

The invention relates to a method for counting insoluble particles. The method comprises the following steps: firstly, processing a photocurrent signal output by a sensor for detecting insoluble particles into a voltage pulse signal corresponding to different insoluble particles; then carrying out integral computation on each pulse to obtain the area of each pulse; and finally, respectively carrying out statistical counting on the integral computation result of each pulse. A device for counting insoluble particles comprises a sensor for detecting insoluble particles, a signal processing circuit connected with the output end of the sensor, and an MCU signal screening and counting circuit connected with the signal processing circuit. By adopting the method and device for counting the insoluble particles disclosed by the invention, the area of the pulse is obtained by integration, so as to distinguish the particles with different particle sizes. Thus, the resolution ratio is improved, the circuit is simplified, and the detection accuracy and sensitivity are improved.

Description

technical field [0001] The invention relates to a method and a device for counting insoluble particles detected by a sensor according to different particle sizes. Background technique [0002] Conventional insoluble particle counting devices such as the attached figure 1 As shown, it includes a sensor 101 for detecting insoluble particles, a signal processing circuit 102 connected to the sensor 101 , a counting module 105 connected to the output of the signal processing circuit 102 and an MCU 104 connected to the counting module. [0003] The insoluble particle counting device works in a voltage comparison mode. First, the photocurrent signal output by the sensor 101 is amplified and filtered by the signal processing circuit 102 and converted into a voltage signal. The voltage signal consists of several pulses with different amplitudes and pulse widths, and each pulse corresponds to an insoluble particle. Then the voltage signal is input into the counting module 105 . The...

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Problems solved by technology

[0005] When this device performs multi-channel detection to realize synchronous counting of particles of different particle sizes, the preset particle sizes in each counting system cannot be changed. On the one hand, a multi-channel counting system 103 (that is, multiple sets of comparators 201, counter 202 and DAC203), which greatly increases the number of circuit chips, reduces the anti-interference ability of the circuit, increases the PCB area of ​​the circuit and consumes a lot of power, and has higher requirements on the number and speed of the ports of the MCU104. Multiple preset reference voltages make the test process cumbersome, which is ultimately not conducive to the miniaturization and intelligence of the device

In addition, only using the different pulse amplitudes generated by insoluble particles to identify particle sizes, while ignoring the pulse width generated by insoluble particles, greatly reduces the resolution and sensitivity together

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