Distance measuring device for acoustically measuring distance

Details Distance measuring device for acoustically measuring distance Distance measuring device for acoustically measuring distance

2007-08-28

2007-08-28

Lobo, Ian J. (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

C367S902000, C073S649000, C073S629000

Reexamination Certificate

active

11262968

ABSTRACT:
A distance measuring device includes a transmitter for transmitting an acoustic signal at a distant object, an acoustic signal receiver for receiving a reflected acoustic signal reflected from the distant object, a temperature sensor detecting air temperature, a humidity sensor detecting air humidity, an amplifier amplifying the reflected acoustic signal, a comparator coupled to the amplifier comparing the amplified reflected acoustic signal with a reference and generating a comparator output when the level of the amplified reflected acoustic signal exceeds the reference, a gain controller increasing the gain from transmitting an acoustic signal until the comparator output is generated, a threshold generator providing the reference to the comparator and decreasing the reference at an exponential rate from transmitting the acoustic signal until the comparator output is generated, and a controller determining use of only the air temperature, velocity of the acoustic signal, and distance traveled from transmitting the acoustic signal until the comparator output is generated.

REFERENCES:
patent: 4581726 (1986-04-01), Makino et al.
patent: 4608674 (1986-08-01), Guscott
patent: 4719605 (1988-01-01), Eder et al.
patent: 4910717 (1990-03-01), Terry
patent: 5442592 (1995-08-01), Toda et al.
patent: 6304179 (2001-10-01), Lotito et al.

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