Digital signal processing method and circuit of micro-charge particle sensing instrument
A particle and circuit calculation technology, applied in the direction of instruments, scientific instruments, power amplifiers, etc., can solve the problems of missing or false alarms, and the inability to judge the pulse of clearing bags when the reference value drifts.
Active Publication Date: 2011-12-07
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 described in further detail below with reference to the accompanying drawings and the 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 by the digital simulation method using the particle flow information are described:
[0059] When a particle flies by the probe, the size of the induced charge of 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 conductive sheet, 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 probe in the direction perpendicular to the flow direction thickness, a...
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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 a micro-charge particle sensing measurement technology, in particular to a digital signal processing method and circuit in a micro-charge particle sensing instrument. By adopting the method and the circuit, the micro-charge induction principle is used to calculate the flow density of dust in the airflow, the overall flow velocity and flow rate of the particles, etc. index. Background technique [0002] The micro-charged particle sensing measurement technology is a practical technology for online monitoring of dust emissions and measurement of indicators such as the flow of solid particles in pneumatic conveying pipelines. In the process of industrial production, how to measure and monitor the concentration and flow rate of particulate matter in the airflow and the methods and measuring instruments have always been the focus of the industry. In the past 30 years, with the gradual maturity of the micro-charged particle sensing m...
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Login to View More 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