Ultrasonic-based small-range liquid level measuring device and measuring method

Abstract

The invention belongs to the technical field of liquid level measurement, and in particular relates to an ultrasonic-based small-range liquid level measurement device and a measurement method. A small-range liquid level measuring device based on ultrasonic waves, including a piezoelectric ceramic sheet for emitting ultrasonic waves, a circular piezoelectric ceramic sheet for receiving ultrasonic waves, and two piezoelectric ceramic sheets for emitting and receiving ultrasonic waves are fixed on The substrate, two piezoelectric ceramic pieces are exposed to contact with the liquid to be tested; the piezoelectric ceramic piece used to emit ultrasonic waves is connected to the ultrasonic signal generator through a lead wire, and is driven by the ultrasonic signal generator to emit ultrasonic waves; the circular piezoelectric ceramic sheet used to receive ultrasonic waves The electric ceramic chip is connected with the signal detector through the lead wire. The invention overcomes the measurement blind area of ​​0-5 cm, can realize the small-range measurement of the liquid level, and can be used for the small-range measurement of the road water accumulation.

Description

technical field [0001] The invention belongs to the technical field of liquid level measurement, and in particular relates to an ultrasonic-based small-range liquid level measurement device and a measurement method. Background technique [0002] Ultrasonic liquid level measurement technology is widely used in hydrology, water conservancy engineering, various mines, underground and other flammable and explosive occasions to observe liquid level or storage level detection and other fields, but among the currently used ultrasonic liquid level measurement technologies, the most widely used It is a pulse echo detection method. Its principle is to transmit ultrasonic waves through an ultrasonic sensor and receive the echo signal reflected from the measured target, determine the time of ultrasonic pulse from emission to reception, and then calculate the ultrasonic wave according to the speed of ultrasonic propagation. The distance between the sensor and the measured object. For ex...

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Problems solved by technology

However, this method depends on whether the propagation velocity of ultrasonic waves in the medium can be accurately obtained, but the propagation velocity of ultrasonic waves in the medium is related to the medium material, ambient temperature, humidity and other factors, so the measurement accuracy is limited

Moreover, due to the aftershock during ultrasonic emission, there is a blind area of ​​at least 5cm in the measurement of liquid level by the ultrasonic echo detection method. Therefore, it is impossible to realize the small-range liquid level measurement of 0-5cm, and it cannot be used for the small-range measurement of road water accumulation.

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