Ultrasonic sensor is a sensor that can measure distance and position by sending and receiving ultrasonic waves. Since the sunroofs of automobiles are almost transparent, various sensors based on optical principles cannot measure. The ultrasonic sensor can send out ultrasonic waves and receive echoes

With regard to ultrasonic transducers, ultrasonic transmitting and receiving circuits are devices for converting electrical energy and acoustic energy. Generally, the ultrasonic transducer has low electromechanical energy efficiency, which seriously affects the working distance of the ultrasonic tra

A multi-probe ultrasonic range finder for detecting traffic flow conditions, which not only provides information for traffic flow survey statistics and intersection traffic signal automatic control systems, but also applies to various automatic monitoring related to motor vehicle passing and arrival

Work programIf a piezoelectric ceramic piece with a resonant frequency of 40 kHz in the transmitting sensor is applied (a 40 KHz high-frequency voltage is applied to the double crystal oscillator, the piezoelectric ceramic piece is elongated and shortened according to the polarity of the applied hig

In the industry, the typical application of ultrasonic waves is non-destructive testing of metals and ultrasonic thickness measurement. In the past, many technologies were hindered by the inability to detect the inside of objects, and the emergence of ultrasonic sensing technology changed this situa

There are many methods for measuring distance ultrasonic sensors, and the most used ones are Pellam and Galt in 1946.The pulse echo method proposed in the year, the working principle of the ultrasonic probe is excited by the ultrasonic frequency pulse to radiate the ultrasonic wave outside, and the

The structure of the multi-node disk ultrasonic transducers, the horn function is to amplify the ultrasonic amplitude, and the large disk can improve the transducer's pointing. The working principle of this type of transducer is to connect a longitudinal conical horn and the longitudinal piezoelectr

At present, foreign big car companies have invested a lot of resources to develop advanced anti-collision and safety warning systems for advanced cars with GPS, but the excessive cost limits its application in ordinary cars. To this end, greatly reducing the cost of the car's active anti-collision a

In order to facilitate the application and significance of the research topic of the large range ultrasonic ranging system in the following chapters, it is first necessary to understand the research status and development trend of the current automotive ranging sensor technology field. a brief intro

When ultrasonic distance measurements transducers are made on the tree barriers in transmission corridors, most of the crowns in the corridors are not a smooth surface, the canopy is non-specular reflection of the signal from the ultrasonic detector, ultrasonic absorption effect is large, and the si

The principle of drone technology and ultrasonic ranging transducer demonstrates the loss feasibility of measuring the obstacles in the electrical circuit corridor; the third chapter mainly introduces the ultrasonic ranging transducer system equipment, including selection of UAV equipment parameters

Researching on acoustic transducer layer materials began in the 1980s. In 1998, Kim Yeonbo and Roh Yongrae uses the method of time domain analysis to theoretically give a suitable for broadband, it is high energy ultrasound structure of the energy device and the best acoustic impedance matching valu