Ultrasonic transducer S1844 DATA SHEET Intended use A general-purpose low-frequency dry-point-contact (DPC) transducer S1844 for transmitting or receiving shear-horizontal ultrasonic waves in highly scattering materials (concrete, wood, stones etc.) can be used in ready-made housing with the Lemo00 plug or non-wired for self-tailored applications, e.g. for customization of transducer arrays by the customer. Main technical specifications Type of transducer: Type of generated wave mode: Nominal frequency: Electric capacity of the piezoelectric element: Maximum excitation pulse voltage: Delay time in transducer protector: Connector type: Overall dimensions: Weight: Operating temperature range: Dry point contact for couplant free operation Shear horizontal 50 kHz 5000±500 pF 400 V 0.9 µs LEMO 00.250 46x 15 mm 10 g -20 to +50 ◦ C Measurement conditions and equipment used The measurement of the tested DPC transducer characteristics occurs in combination with the reference DPC transducer, whereby both transducers are connected by their tips with the nip force of 2 N. The tested transducer operates as a transmitter and the reference transducer operates as a receiver of ultrasonic waves. The double conversion ratio AFCmaximum Srel is determined as a ratio value between the received signal amplitude on the reference transducer and excitation pulse amplitude on the tested transducer. Excitation signal: square pulse with the amplitude 200 V, duration 10 µs, equal to half period of the nominal frequency. Reciever parameters: integrating amplifier with the bandwidth 1kHz – 15 MHz, input resistance 4 kΩ, equivalent input noise voltage 10 µV. Environmental conditions: Measured characteristics Amplitude-frequency response Shape of the measured pulse Echo pulse duration: Absolute transmission bandwidth P : Relative transmission bandwidth Bw :