Pressure type digital material-level sensor and its measurement method

Abstract

The invention provides a pressure-typed digital article position sensor, which is characterized in that a rod-shaped body is provided with a plurality of piezoelectric ceramic sheets which are vertically arranged into a line with equal distances and connected with a micro-voltage detection integration circuit and a power supply. During the measurement, each piezoelectric ceramic sheet below the article position generates a weak electric signal which changes into a state of high level '1' with determined amplitude after filtration, amplification, shaping and comparing, and is obviously distinguished from the state of low level '0' output by a plurality of piezoelectric ceramic sheets above the article position; the number of all high levels '1' which is counted by the collecting circuit is the current digital article position value. During the measurement, the pressure-typed digital article position sensor has no relation with the physical performances of the object to be measured such as dielectric constant, magnetic permeability and resistivity, etc., has the advantages of good detection reliability, high precision and simple structure, is especially suitable for the measurement of powder-shaped or small grain-shaped solid article position in coal bins and grain depots, etc.

Description

technical field [0001] The invention relates to a material level sensor and a measuring method thereof, in particular to a digital sensor and a measuring method thereof which use pressure to measure material level, and belongs to the technical field of sensors. Background technique [0002] At present, the use of pressure for level measurement is mainly used for liquid level measurement, and it is rare for material level measurement. The existing products that use the principle of static pressure to measure liquid level include LU400, DB50 / 53, UBY-3103 and other static pressure liquid level gauges, among which differential pressure liquid level transmitters are widely used in industrial production, such as LY-P200 series differential pressure transmitter is a new type of industrial pressure transmitter developed by Lanyu Electric Automation Co., Ltd. Static pressure measurement mainly uses diffused silicon as the sensing element. When the measured pressure acts on it, due t...

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Problems solved by technology

However, this kind of liquid level transmitter can only measure the liquid medium with low viscosity and pure liquid, and when the differential pressure liquid level transmitter is measuring, the liquid at the position of the transmitting head should be kept static, otherwise the liquid will affect the transmission. The flushing of the head will cause pressure fluctuations, resulting in large errors in the measurement of the liquid level transmitter

At the same time, these sensors are powerless to measure the solid state level.

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