Differential Planar Capacitive Sensor Array Measuring Method of Particle Velocity Distribution

Abstract

The invention discloses a particle velocity distribution differential planar capacitive sensor array measurement method. A differential planar capacitive sensor array measurement device is adopted. The differential planar capacitive sensor array measurement device comprises a measurement probe which is connected with P paths of parallel arranged differential capacitance detection circuits, a dataacquisition card and a computer which are connected in turn. The measurement method comprises the steps that two sets of capacitive signals reflecting gas-solid flow information are generated along the axially adjacent capacitors when the solid phase particles move along the axial direction of the insulation measurement duct; the signals are transmitted to the differential capacitance detection circuits to be differentially amplified and then outputted to the data acquisition card to be acquired so as to be transmitted to the computer; and the computer performs spatial filtering algorithm processing on the signals acquired and outputted by the data acquisition card so that the gas-solid two-phase flow particle velocity distribution information is acquired. The problems existing in the prior art that the distribution of the velocity field on the duct section cannot be acquired and the spatial frequency selectivity is low can be solved.

Description

technical field [0001] The invention belongs to the technical field of gas-solid two-phase flow measurement methods, and relates to a method for measuring particle velocity distribution with a differential planar capacitance sensor array. Background technique [0002] Gas-solid two-phase flow exists widely in industrial fields such as energy, chemical industry, electric power and metallurgy. Particle velocity is an important parameter to reflect the characteristics of gas-solid two-phase flow. The real-time detection of particle velocity distribution is of great significance for the monitoring of fluid flow state and measurement, energy saving and control in the production process. At present, according to different sensor measurement principles, a variety of non-contact detection methods have been used to measure the velocity of solid phase particles, such as Doppler, cross-correlation, spatial filtering, nuclear magnetic resonance, and tracer methods. The Doppler method u...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a differential planar capacitive sensor array measurement method for the particle velocity distribution, which solves the problems in the prior art that the distribution of the velocity field on the pipeline section cannot be obtained and the frequency selectivity of the spatial filter is low.

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