Ultrasonic transducer S1808 DATA SHEET Intended use A general-purpose low-frequency transducer S1808 for the dry-point-contact (DPC) excitation or acquiring 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: Special properties: Nominal frequency: Electric capacity of the piezoelectric element: Maximum excitation pulse voltage, V: Delay time in transducer protector: Connector type: Overall dimensions: Weight: Operating temperature range: Dry-point-contact Shear-horizontal Couplant-free operation 250 kHz 980 ± 100 pF 400 V 0.9 s LEMO00.250 11x22.6 mm 14 gr from -20 to +50 ◦C Measurement conditions and equipment used Temperature 25ºC, rel. humidity 43% Generator transmitting signal: square pulse with 200 V amplitude, duration 10 s Receiving path parameters: integrating amplifier bandwidth 0.001 – 40 MHz, noise 0.7 V / Hz, input resistance 4 kΩ. Calibration sample: 3D box UCB500, plexiglass, thickness 175 mm, longitudinal wave velocity 2700 m/s, transversal waves velocity 1300 m/s. Measured characteristics Amplitude frequency response Shape of the measured pulse Time, µs Pulse duration: Maximum AFR frequency fp: Lower AFR frequency fl: Upper AFR frequency fu: Frequency, Hz Operating AFR frequency fc: Nominal double conversion ratio Srel: Absolute band width P: Relative band width Bw: