ultrasonic sensor work in the ultrasonic level gauge meter principle

- May 03, 2018 -


The ultrasonic level gauge is a microprocessor-controlled digital level gauge. Its working principle is this:

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In the process of level measurement, the ultrasonic signal is sent out by the ultrasonic sensor probe, reflected by the surface of the liquid or solid material and folded back. It is received by the same ultrasonic sensor probe and measures the entire operating time of the ultrasonic wave so as to achieve the measurement of the material level.

According to the medium of sound wave propagation, the ultrasonic level gauge can be divided into three types: solid medium type, liquid medium type and gas medium type. Ultrasound transducer probes can use either two or one. The former is a probe emitting ultrasonic waves, and the other probe is used for receiving; the latter is that the transmitting and receiving sound waves are performed by one probe, but the transmitting and receiving times are staggered with each other.

翻译时出错The ultrasonic transducer used for the ultrasonic level meter consists of piezoelectric crystals such as lead zirconate titanate and barium titanate. Piezoelectric crystals have a piezoelectric effect. When an external force acts on the crystal face, charges are generated at both ends of the crystal, and the opposite ends have opposite polarities. If the external force is alternating, an alternating electric field is generated at both ends of the crystal. This phenomenon is called positive piezoelectric effect.

Instead, an alternating voltage is applied to the electrodes at both ends of the crystal. This produces a mechanical vibration along the thickness of the crystal that is the same frequency as the applied alternating voltage and emits acoustic waves to the surrounding medium. This is called counterpropagation. Piezoelectric effect. According to the inverse piezoelectric effect and the positive piezoelectric effect, an emitter type transducer and a receiver type transducer can be designed.

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Ultrasonic level meter is an industrial instrument designed to measure the liquid level by using the characteristics of good ultrasonic directionality, strong penetrating ability, easy to obtain relatively concentrated sound energy, and long distance travel in water. Ultrasonic level gauge has been widely used in various fields such as medicine, military, industry, and agriculture.

Level and material level measurement is a problem frequently encountered in the industry. Ultrasonic positioning technology has many advantages. It can not only provide fixed-point and continuous positioning, but also can easily provide signals needed for remote measurement or remote control. Compared with radiometric positioning technology, ultrasonic technology does not require protection. Compared with laser ranging technology, it has advantages of simplicity and economy. At the same time, ultrasonic technology generally does not need moving parts, so it is relatively convenient for installation and maintenance. 


Ultrasonic level meter can be widely used in petroleum, mining, power plants, chemical plants, water treatment plants, sewage treatment stations, agricultural water, environmental monitoring, food (brewing industry, beverage industry, additives, edible oil, dairy products), flood control Flood prevention, hydrological monitoring, open channels, space positioning and many other industries.

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