Ultrasonic sensor

Details Ultrasonic sensor Ultrasonic sensor

1984-04-20

1985-07-16

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73628, 310335, 310800, 367 93, 367151, G01N 2900

Patent

active

045288534

ABSTRACT:
An ultrasonic sensor for determining objects in air or other gaseous media is disclosed. The sensor comprises a first ultrasonic transducer having a piezoelectric transmitter. A reflector is provided having a concave surface facing the first ultrasonic transducer which forms a segment of an ellipsoid. The reflector has two focal points, the first of which is closer to the reflector and the second of which is near the object to be detected. Between the first ultrasonic transducer and the reflector, a second ultrasonic transducer is provided which is arranged at the first focal point of the reflector. Preferably, the surface of the second ultrasonic transducer facing the reflector forms a spherical segment. By this arrangement, an increase of the receiving aperture is achieved, and objects can be determined which have a normal to the reflection surface inclined with respect to the axis of the sound lobe by an object position angle which is substantially larger than .+-.3.degree.. Additionally, objects with a curved reflection surface can be determined unambiguously.

REFERENCES:
patent: 3106839 (1963-10-01), Sansom
patent: 3163784 (1964-12-01), Renaut
patent: 3912954 (1975-10-01), Baird
patent: 4440983 (1984-04-01), Facoetti et al.

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