Ultrasonic transducers or ultrasonic sensors are a type of acoustic sensor divided into three broad categories: transmitters, receivers and transceivers. Transmitters convert electrical signals into ultrasound, receivers convert ultrasound into electrical signals, and transceivers can both transmit and receive ultrasound.
In a similar way to radar and sonar, ultrasonic transducers are used in systems which evaluate targets by interpreting the reflected signals. For example, by measuring the time between sending a signal and receiving an echo the distance of an object can be calculated. Passive ultrasonic sensors are basically microphones that detect ultrasonic noise that is present under certain conditions.
Ultrasonic probes and ultrasonic baths apply ultrasonic energy to agitate particles in a wide range of materials
Ultrasonic transducer, also known as ultrasonic vibrator, is a device which realizes the mutual exchange of electrical energy and mechanical energy (acoustic vibration) by piezoelectric effect of piezoelectric ceramics, and amplifies by front and rear radiation cover blocks matched with acoustic impedance. Ultrasonic cleaning is to achieve good cleaning effect by ultrasonic vibration generated by transducer and instantaneous high-pressure cavitation generated by cavitation effect in water.
The ultrasonic cleaning transducer adopts the horn type composite array structure (belonging to the Langevin vibrator structure), which is composed of front and rear metal cover plates, piezoelectric ceramic chips, prestressed screws, electrode pieces and insulating sleeves. With proper prestressing force, the transducer has good mechanical and electrical conversion efficiency under the condition of high power and high amplitude.
Typical Impedance Responce Trace (Radial Resonance)
The above is a typical impedance trace measured on a dedicated analyser and depicting the resonance and anti-resonance points associated with the ring shaped component. This data allows the calculation of piezoelectric activity and other important characteristics required for the application.
