Measuring and testing – Vibration – By mechanical waves
Patent
1988-12-09
1990-04-10
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
367903, G01N 2900
Patent
active
049149512
ABSTRACT:
An apparatus for remote distance measurement varies the decay time of an electronic transducer to measure the distance to objects that are close to the transducer. The decay time for the amplitude of the oscillations of the transducer is varied by changing the transmitting frequency of the transducer since the rate at which the transducer oscillations decay depends on the transmitting frequency. The frequency is changed using a circuit comprising an electroacoustic transducer, a generator, a receiving amplifier and a control circuit. The generator generates an oscillation signal having a constant transmitting frequency and constant amplitude for a given transmitting time that depends on the distance of the object from the transducer. The transmitting frequency is chosen to measure the distance to a close object so that the transducer amplitude decays so fast that the echo signal can be received and evaluated without interference. The circuit for the remote distance measurement apparatus has particular application in motor vehicles.
REFERENCES:
patent: 4156823 (1979-05-01), Suzuki
patent: 4597068 (1986-06-01), Miller
patent: 4701893 (1987-10-01), Muller et al.
patent: 4785664 (1988-11-01), Reebs
Standard Search Report RS 80400 DE 7/18/88.
Radio Fernsenhen Elektronik, vol. 29, No. 2, 1980, pp. 74-75.
Electrical Design News, vol. 31, No. 7, (Apr. 1986).
Forster Alfred
Koelpin Thomas
Arana Louis M.
Siemens Aktiengesellschaft
Williams Hezron E.
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