Communications – electrical: acoustic wave systems and devices – Echo systems
Patent
1985-10-29
1987-03-31
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
367138, G01S 752
Patent
active
046548335
ABSTRACT:
A method for measuring the running time of a signal transmitted by a transmitter and received by a receiver is devised, where the signal is transmitted and received by the same transducer. For transmitting the transmitter is driven by an electrical pulse train, and in receiving the received signal is converted back into an electrical signal. In receiving triggering is done on the trailing edge of the envelope of the received signal. At the transmitting side the transducer after its incitement is driven by a pulse train being in phase opposition to the original inciting signal and having a larger amplitude than the original inciting signal which results in a higher steepness of the envelope. At the receiving side the maximum amplitude is measured, and the triggering point of time is determined when the actually measured value of the envelope falls below a certain percentage value of the maximum value.
REFERENCES:
patent: 3109154 (1963-10-01), Grada et al.
patent: 3449710 (1969-06-01), Moss, Jr.
Ultrasonics, by Winter et al, May 1975, pp. 110-112.
IEEE Trans. on Instrumentation and Measurement, by Chande et al, Jun. 1984, pp. 128,129.
Blinn Clyde C.
Farley Richard A.
Honeywell GmbH
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