Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Patent
1993-08-16
1994-08-23
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Distance or direction finding
367138, 367116, G01S 1500
Patent
active
053413466
ABSTRACT:
A small "flashlight" size pointing device for use as a sonar obstacle avoidance system for the blind. The apparatus comprises a bundle of small diameter tubes mounted in front of and perpendicular to the plane of a transducer. The transducer transmits sonic or ultrasonic pulses down the tubes which then spread out as a wave. Reflected waves, returning from obstacles are only detected by the transducer if they originate in a certain spatial beam area. This spatial beam area is controlled by the length and diameter of the tubes and by the transducer amplifier gain when used as a detector of reflected waves. Suitable values for the control variables result in reflections from obstacles only being detected in a spatial beam which can have a constant cross section independant of the distance of the reflecting object. For use as an obstacle avoidance system, repeated pulses are transmitted by the transducer and the delays between the transmitted pulse and the reception of the reflected wave are converted to audio tones.
REFERENCES:
patent: 3321737 (1967-05-01), Russell
patent: 4310903 (1982-01-01), Kay
patent: 4894806 (1990-01-01), Jen et al.
patent: 4933915 (1990-06-01), Bostrom
patent: 4937796 (1990-06-01), Tendler
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