Digital signal processing method and circuit of micro-charge particle inductor
A particle and current signal technology, which is applied in the direction of instruments, scientific instruments, power amplifiers, etc., can solve the problems of unable to judge the pulse of clearing the bag by the drift of the reference value, missing or false alarms, etc.
Active Publication Date: 2013-02-13
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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[0057] 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.
[0058] 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:
[0059] 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 inductor. In the invention, digital simulation is carried out on the flow of the particles by utilizing a micro-charge induction principle so that the characteristics of various particles in a flowing state are acquired, and the velocity, the density and other factors of the particle are calculated according to the simulation result and the actually measured original signal so that the measurement range and accuracy of the high-sampling-frequency micro-charge particle inductor are increased. The method for estimating the velocity, the flow and the density of the particle by using low-frequency original signals can be used for improving the accuracy for measuring the velocity, the flow and the density of the particle by using a low-cost and low-sampling-frequency circuit. A multi-stage amplification circuit can automatically eliminate the measurement deviation and maintain the temperature stability while preserving sufficient bandwidth and high gain of the signals. A method for setting a leakage warning condition in a density warning switch and a filter bag leakage monitor can be led to adapt to the normal operation of a dust catcher.
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): G01F1/64G01P5/08G01M3/02G01N27/60H03F3/20
Inventor 杜豫生
Owner 杭州科灵威识精密仪器有限公司