Audio railway crossing detector

Details Audio railway crossing detector Audio railway crossing detector

1998-07-10

1999-06-08

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

367909, 367100, 367 89, G01S 1500

Patent

active

059109297

ABSTRACT:
The present invention, generally speaking, provides an acoustic railway crossing detector. The present invention provides a means of not only detecting the presence of a train, but it can determine speed and direction of travel. This allows a more adaptive control of the railway crossing gates and may reduce the nuisance factor of having the gate close too far in advance of the train reaching the crossing. It is also much less susceptible to false activation by natural causes or acts of vandalism. In accordance with one embodiment of the invention, an acoustic railway crossing detector includes at least one acoustic emitter; at least one acoustic detector; multiple reflectors arranged to reflect acoustic energy produced by an acoustic emitter toward an acoustic detector, and control circuitry coupled to an acoustic detector for producing an indication of whether or not a train is present.

REFERENCES:
patent: 3176126 (1965-03-01), Vineall
patent: 5774045 (1998-06-01), Helma et al.

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