Digital signal processing method and circuit of micro-charge particle sensing instrument
A technology of digital signal processing and charge sensing, applied in instruments, scientific instruments, particle suspension analysis, etc., can solve the problems of inability to judge the pulse of clearing the bag by the drift of the reference value, missing or false alarms, etc.
Active Publication Date: 2012-02-08
杭州科灵威识精密仪器有限公司
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Problems solved by technology
Although this method reduces the burden of manpower, the instrument cannot make judgments on the drift of the reference value and the periodic bag-clearing pulse due to the aging of the filter bag, which may easily cause insufficient alarms or false alarms.
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[0052] The method of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments of the present invention.
[0053] The micro-charge induction principle adopted in the present invention and the process of obtaining the original electrical signal using the digital simulation method of particle flow information are described:
[0054] When a particle flies past the probe, the amount of charge induced by the probe depends not only on the shape of the probe, the radial distance between the probe and the particle, but also on the net charge of the particle and the axial velocity of the particle. In order to simplify the analysis of the induced current, we assume that the probe is a thin piece of conductor, which can be inserted into the pipe in the form of a straight rod, or embedded in the pipe wall in the form of a ring, so that we can ignore the direction of the probe perpendicular to the flow direction thickness,...
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The invention discloses a digital signal processing method of a micro-charge particle sensing instrument, which uses the principle of micro-charge induction and digitally simulates the flow of particles to obtain the characteristics of the signal in various particle flow states, and uses the simulation results Calculate the flow velocity, flow rate and concentration of particles with the measured original signal to improve the measurement range and accuracy of high sampling frequency micro-charged particle sensing instruments. A method for estimating particle flow, flow velocity, and concentration by using low-frequency original signals can improve the accuracy of measuring the particle flow, flow velocity, and concentration by using a low-cost, low-sampling frequency circuit. A multi-stage amplification circuit can automatically eliminate measurement deviation and maintain temperature stability while retaining sufficient bandwidth and high signal gain. A method for setting leakage alarm conditions in a concentration alarm switch and a filter bag leakage monitor, which adapts to the normal operating conditions of the dust collector by setting the leakage alarm conditions.
Description
technical field [0001] The invention relates to micro-charge particle sensing measurement technology, in particular to a digital signal processing method and circuit in a micro-charge particle sensing instrument, by using the method and circuit to calculate the dust flow density in the airflow, the overall flow velocity and flow rate of particles, etc. index. Background technique [0002] The micro-charge particle sensing measurement technology is a practical technology for on-line monitoring of dust emissions and measurement of the flow rate of solid particles in pneumatic conveying pipelines. In the industrial production process, how to measure and monitor the concentration and flow of particulate matter in the airflow and the method and measuring instruments have always attracted the attention of the industry. In the past 30 years, with the gradual maturity of micro-charge particle sensing measurement technology and related products, more and more engineers and manufactu...
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IPC IPC(8): G01N15/06G01P5/08G01F1/74
Inventor 杜豫生
Owner 杭州科灵威识精密仪器有限公司