Air Ultrasonic Ceramic Transducers Application Note

Selection and use of ultrasonic ceramic transducers the purpose of this application note is to aid th e user in the selection and application of the ultrasonic ceramic transducers.

Air ultrasonic ceramic transducers application note.

The ultrasonic transducer emits an ultrasonic wave pulse see figure 1. This technology is used for detection of objects in burglar alarms and automatic doors as well as for range measurement in automotive parking assistance systems. Ultrasonic sensors emit ultrasonic waves in the air that reflect off of objects. 0db re 0 0002μbar per 10vrms at 30cm 112db min.

The general transducer design features a piezo ceramic disc bender that is resonant at a nominal frequency of 20 60 khz and radiates or receives ultrasonic energy. Capacitance at 1khz 20 250st 3000 pf. The technical notes section is designed to provide a brief overview of the ultrasonic principles important to transducer application and design. Once the pulse is emitted the transducer becomes quite in order to receive object echoe s.

The transducer face must be made to couple to the solid material type for direct transducer to solid contact. The general transducer design features a piezo ceramic disc bender that is resonant at a nominal frequency of 20 60 khz and radiates or receives ultrasonic energy. All these examples were scanned in through transmission with 400 khz air coupled toneburst method. Ultrasonic testing involves frequencies beyond the upper limit of human hearing.

Ultrasonic sensing principle 1. It is the combination of specially designed transducers with the proper driver receiver instrumentation that has made air coupled ultrasonic inspection a valuable new. Ultrasonic sensors emit ultrasonic waves and a receiver detects waves reflected from obstacles to confirm the presence of objects and measure to distance to obstacles. Use two transducers one to continuously generate the ultrasonic echo and the other to continuously capture the difference in return echo zero crossing frequency doppler shift.

Air ultrasonic ceramic transducers 250st r160 specification 250st160 transmitter 250sr160 receiver center frequency 25 0 1 0khz bandwidth 6db 2 0khz transmitting sound pressure level at 25 0khz. The reflected sound is then received by the sensor. The purpose of this application note is to aid the user in the selection and application of the ultrasonic ceramic transducers. Design characteristics of transducers 4.

Advanced definitions and formulas 3. They are distinguished from the piezo ceramic. Ti top device pick. Receiving sensitivity at 25 0khz 0db 1 volt μbar 62db min.

When the wave pulse reaches an objec t the reflected wave called an echo is bounced back to the transducer. Basic ultrasonic principles 2. Sound waves are all around us as mechanical vibrations carried by a medium such as air or water.