Ultrasonic transmitter or receiver

Details Ultrasonic transmitter or receiver Ultrasonic transmitter or receiver

1975-04-29

1977-08-02

Farley, Richard A.

Communications: electrical

Selective

310330, 310335, G01S 966, H04R 120, H04R 1710

Patent

active

040399982

ABSTRACT:
A directional ultrasonic vibrator has at least one resonant reed, at least one ultrasonic transducer secured to the reed for producing bending moments in the reed along its longitudinal axis, all adapted to perform an operation selected from the group consisting of transmission and reception by the transducer in response to an input electrical signal applied thereto predetermined dimensions and material being employed to permit resonant longitudinal bending vibrations in the reed at a predetermined frequency of said input electrical signal. The parameters are selected with respect to the material and medium in which it is immersed. A blade of two reeds may be employed for symmetrical directional transmission. As an aid to the blind the latter device is used in air with one reed connected as receptor and the device is of a size readily directed in the path of the unsighted for giving an audible warning of approach to potential obstacles while gripped by the unsighted wearer to whose person a box may be strapped containing a power pack and parts of the above equipment.

REFERENCES:
patent: 2875353 (1959-02-01), Cavalieri, Jr. et al.
patent: 3525884 (1970-08-01), Onoe et al.
patent: 3614485 (1971-10-01), Cosman et al.
patent: 3846779 (1974-11-01), Martner
Sunthankar, The Radio and Electronic Engineer, vol. 42, No. 12, Dec. 1972, pp. 531-536.
Sunthankar, IEEE Trans. Sonics and Ultrasonics, vol. SU-20, No. 3, July 1973, pp. 274-278.

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