Boots – shoes – and leggings
Patent
1992-02-10
1992-12-29
Teska, Kevin J.
Boots, shoes, and leggings
367127, G01S 0380
Patent
active
051756951
ABSTRACT:
An ultrasonic measuring apparatus comprising a master unit and a slave unit each having a respective transmitter circuit for transmitting towards the other unit a burst of ultrasound and each having a respective receiver circuit to detect the burst of ultrasound transmitted by the other unit. The slave unit is responsive to the detection of a burst transmitted by the master unit to transmit a return burst back to the master unit. The master unit includes control means for disabling its receiver circuit during transmission of the said burst to the slave unit and thereafter until the end of a first period of time which is sufficiently long to permit all echoes from the said burst to decay to a level where the master unit receiver circuit is not sensitive enough to detect them. The master unit further has means for determining the distance between the master and slave units as a function of the time elapsed between the end of the first period of time and the detection by the master unit of the return burst from the slave unit.
REFERENCES:
patent: 3076519 (1963-02-01), Alsabrook
patent: 4254478 (1981-03-01), Dumas
patent: 4455556 (1984-06-01), Koshio et al.
patent: 4894810 (1990-01-01), Jukkala
Cosimano Edward R.
Suparules Limited
Teska Kevin J.
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