Ultrasonic level meter works by ultrasonic pulse from the sensor (transducer) is reflected by the surface acoustic wave sensor to receive the same after the conversion into electrical signals, then, through the time of transmitting and receiving sound waves to calculate the distance from the sensor to the measured object.

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.

Ultrasonic Anemometer’s work principle is by ultrasonic transit-time to measure the wind speed. Because it can overcome the inherent defects of mechanical anemometer, it can work in whole day, long time. it gets more and more widely used and is a powerful replacement of mechanical anemometer.

Ultrasonic parking sensor works by ultrasonic pulse from the sensor (transducer) to issue, reflected by the surface acoustic wave sensor to receive the same after the conversion into electrical signals, then, through the time of transmitting and receiving sound waves to calculate the distance from the sensor to the measured object. When close to a safe distance when reversing, it can tell the driver his around obstacles by voice or a more intuitive display case.

Ultrasonic flow meter is a "speed difference method" for the principle to measure the liquid flow in tube. It uses advanced multi-pulse technology, digital signal processing and error correction technology. The flow meter can adapt to the industrial field environments, measurement more convenient, economical and accurate.

Using ultrasonic sensor as transmitter and receiver, transmitter emission amplitude ultrasound to area being detected, the receiver receives the reflected ultrasound. When there is no moving object is detected to enter the area, the reflected ultrasound is amplitude. When there are active objects into the detection area, the magnitude of the reflected ultrasonic ranging, and changing. Receiver circuit detect changes in the signal control circuit and then alarm.

超声波用于获取用于通信应用的若干信息，称为超声波测试。超声波测厚仪使用介质中的超声波脉冲反射来测试物体的厚度。 超声波测厚仪可以测量金属或非金属材料的厚度，还可以测量材料的声速，以判断材料的性质，还可以检查表面附近和平行的缺陷。一般壁厚在10mm以下的测量精度可以达到0.01毫米。 超声波传感器的精度非常高，适用于高精度测量仪器。超声波测厚仪按工作原理分为：谐振法，干涉法和脉冲反射法。

超声波传感器主要材料有压电晶体(电致伸缩)及镍铁铝合金(磁致伸缩)两类。电致伸缩的材料有锆钛酸铅(PZT)等。压电晶体组成的超声波传感器是一种可逆传感器，它可以将电能转变成机械振荡而产生超声波，同时它接收到超声波时，也能转变成电能，所以它可以分成发送器或接收器。有的超声波传感器既作发送，也能作接收。

The product is researched and designed according to this principle. The core circuit is a powerful ultrasonic generator that uses it to emit high-frequency sounds (ie, ultrasonic waves) to drive pet dogs. With this method, pet dogs can be calmed down at night. Randomly barking, or used to surrender some intimidation of evil dogs. For those who are particularly afraid of dogs, it is necessary to carry a dog-walking device with them to prevent the harassment and harm of those unfriendly dogs in the street.