Ultrasonic piezoelectric transducer D1771 DATA SHEET Main technical specifications Transducer type: Nominal frequency: Nominal echo pulse duration: Nominal relative band width: Nominal sensitivity: Piezoelement diameter: Nominal echo pulse delay in protector: Nominal piezoelement capacity: Connector type: Operation temperature range: Dimensions: Weight: Contact straight beam double 4 MHz 0.6 µs 90 % -60 dB 12 mm 0.15 µs 1500 ± 150 pF LEMO 00.250 from -30 to +50 ◦ C 23×44×15 mm 22 g Measurement conditions and used equipment Excitation: Rectangular pulse with amplitude 20 V and duration 125 ns, equal to half-period of nominal frequency oscillations. Amplifier with 0.01-15 MHz bandwidth and 400 Ω input impedance. Effective noise level, normalized to the amplifier input level, is less than 20 µV. Damping resistor: 100 Ω (connected in parallel to the transducer). Single LEMO-LEMO with wave resistance 50 Ω and 1.2 m length. Calbration blocks: Standard parallel-sided steel samples, ultrasonic longitudinal wave velocity 5910 m/s, with thickness 100 mm, 50 mm, 30 mm, 20 mm, 10 mm, 2.5 mm, 1.5 mm, 1 mm, 0.7 mm. Measurement results Backwall echo pulse for 20 mm thickness and its

Reverberation noise characteristics (RNC) for the transducer without acoustic load and the curve of backwall echo signal level for steel samples of different thickness The level of 0 dB corresponds to the excitation pulse amplitude. Calculated parameters and acceptance results Parameter Work frequency (Mean of border spectrum frequencies) , MHz Echo pulse duration (at -20 dB level from maximum) , µs Relative spectrum bandwidth (at -6 dB level) , % Sensitivity (bottom echo pulse and excitation pulse amplitudes’ ratio), dB Echo pulse amplitude, mV Spectrum maximum frequency, MHz Lower spectrum...