Method and device for counting insoluble particles
A particle counting and solubility technology, applied in measurement devices, particle and sedimentation analysis, particle size analysis, etc., which can solve the problem of high requirements on the number and speed of MCU104 ports, large power consumption of circuit PCB area, and unfavorable device miniaturization and intelligence. and other problems, to achieve the effect of improving detection accuracy and sensitivity, simplifying circuit design, reliability and anti-interference guarantee
Inactive Publication Date: 2014-07-23
JIANGSU SUJING GROUP
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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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Embodiment 1
[0032] Embodiment one: see attached Figure 4 shown. A device for counting insoluble particles, which includes a sensor 401, a signal processing circuit 402 connected to the output end of the sensor 401, a signal isolation circuit 403 connected to the output end of the signal processing circuit 402, and an output end of the signal isolation circuit 403 The connected ADC sampling circuit 404 and the MCU signal discrimination and counting circuit 405 connected to the output end of the ADC sampling circuit 404 .
[0033] Sensor 401 as attached Figure 5 As shown in , it works based on the photoresist principle, and is composed of a semiconductor laser 501, an optical lens group, a sample pool and a photodiode 505. The magnitude is converted into a corresponding weak current signal.
[0034] Suppose the length of the detection area of the sample cell of the sensor 401 is L, the radius of the insoluble particles is R, and the moving velocity of the insoluble particles is V, th...
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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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IPC IPC(8): G01N15/00G01N15/02
Inventor 梁凤飞孙吉勇沈玮栋唐红阳周大农陈继宗
Owner JIANGSU SUJING GROUP
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