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D1471 – normal-beam dual-crystal transducer 4 MHz

D1471 – normal-beam dual-crystal transducer 4 MHz
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D1471 – normal-beam dual-crystal transducer 4 MHz - 1

Ultrasonic piezoelectric transducer D1471 DATA SHEET Main technical specifications Transducer type Nominal frequency Nominal echo pulse duration Nominal relative band width Nominal sensitivity Piezoelement diameter Coordinating inductance Nominal piezoelement capacity Connector type Operation temperature range Dimensions Weight contact straight beam double 4 MHz 0,8 µs 40 % minus 60 dB 12 mm absent 1500  150 pF 2 x LEMO 00.250 о from minus 30 to plus 50 С 36  24 mm 58 g Measurement conditions and used equipment Excitation Rectangular pulse with amplitude 20 V and duration 50 ns, equal to half-period of nominal frequency oscillations. Amplifier with 0,01-15,00 MHz bandwidth and 3,6 kΩ input impedance. Effective noise level, normalized to the amplifier input level, is less than 20 µV. Signals are pre-cleaned from low-frequency components using a digital bandpass filter with a bandwidth from 1 to 14 MHz. Damping resistor 200 Ω (connected in parallel to the transducer). Double LEMO-LEMO with wave resistance 50 Ω and 3 m length. Calibration blocks Standard parallel-sided steel samples, ultrasonic longitudinal wave velocity 5910 m/s, with thickness 0,7; 1,0; 1,5; 2,5; 10,0; 20,0; 30,0; 50,0; 100,0 mm. Measurement results Backwall echo pulse for 20 mm thickness and its

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D1471 – normal-beam dual-crystal transducer 4 MHz - 2

Reverberation noise characteristics (RNC) for the transducer without acoustic load and the curve of backwall echo signal level for steel samples of different The level of 0 dB corresponds to the excitation pulse amplitude. The time and thickness axes are marked minus the ultrasound delay time in the prisms. Calculated parameters and acceptance results Value Work frequency (mean of border spectrum frequencies), MHz Echo pulse duration (at minus 20 dB level from maximum), µs Relative spectrum bandwidth (at minus 6 dB level), % Sensitivity (bottom echo pulse and excitation pulse amplitudes’...

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