Set of ultrasonic probeheads for measurements of times of flight of ultrasonic pulses

PCT No. PCT/PL92/00009 Sec. 371 Date Mar. 28, 1994 Sec. 102(e) Date Mar. 28, 1994 PCT Filed Jul. 22, 1992 PCT Pub. No. WO93/03361 PCT Pub. Date Feb. 18, 1993A set of ultrasonic probes for measurement of time of flight of ultrasonic pulses includes a housing (20), two transmitting ultrasonic probes (1, 2) and two identical receiving ultrasonic probes (9, 10) attached to the housing (20). The receiving ultrasonic probes (9, 10) are disposed between the transmitting ultrasonic probes (1, 2) and are disposed along one line with the transmitting ultrasonic probes (1, 2). Time tL of flight of wave pulse in the workpiece along the distance L between the receiving ultrasonic probes (9, 10) is calculated based on propagation time of a ultrasonic wave (7) transmitted by the transmitting ultrasonic probe (1) and received by the receiving ultrasonic probeheads (9, 10) and on propagation time of a ultrasonic wave (8) transmitted by the transmitting ultrasonic probehead (2) and received by the receiving ultrasonic probeheads (9, 10).