Level detection method and system

Abstract

The invention discloses a material level measuring method and system. The method comprises the steps that the intervals between the sending time and the receiving time of four ultrasonic wave signals which are sent to a to-be-measured object are measured, and the transmission time of each ultrasonic wave signal is generated; the transmission time of each ultrasonic wave signal is multiplied by the transmission velocity of each ultrasonic wave signal respectively, and the transmission distance of each ultrasonic wave signal is generated; if the four transmission distances are all larger than preset blind area distance, the average value of the transmission distance of the first ultrasonic wave signal and the transmission distance of the third ultrasonic wave signal is obtained, and average distance is generated; whether the transmission distance of the second ultrasonic wave signal, the transmission distance of the fourth ultrasonic wave signal and the average distance mutually satisfies a preset approximately equal condition is judged, and if the satisfying is achieved, the vertical height from the vertex to the base of a material level isosceles triangle is obtained as the material level of the to-be-measured object. The material level measuring method and system can continuously measure the material level of the to-be-measured object, the error is small, and the failure rate is low.

Description

【Technical Field】 [0001] The invention relates to the technical field of distance measurement, in particular to a level detection method and system. 【Background technique】 [0002] At present, the level detection of particulate objects is mainly divided into contact type and non-contact type. The non-contact measurement method is mainly single-point measurement. A single transmitting point sends ultrasonic waves and a single receiving point receives ultrasonic waves sent by the sending point. It is measured through a short distance. Method to measure the level of granular objects. [0003] However, the above-mentioned non-contact measurement method has a large measurement blind area and is easily affected by factors such as the uneven surface of the object, the dielectric constant, the humidity, the viscosity, and the thermal conductivity lamp. Therefore, the above non-contact measurement method has large measurement errors and high failure rates, and the level of the object canno...

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Problems solved by technology

[0004] Based on this, it is necessary to provide a material level detection method and system for the problems of large measurement error and high failure rate of the above-mentioned non-contact measurement method, and the inability to obtain the material level of the object in real time

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