Dual signal frequency motion monitor and broken rail detector

Details Dual signal frequency motion monitor and broken rail detector Dual signal frequency motion monitor and broken rail detector

1980-06-24

1981-12-22

Groody, James J.

Railway switches and signals

Electric automatic highway signals, mine doors, and gates

246 34R, 246 34CT, 246 34A, 246 28C, 246121, B61L 120, B61L 2932

Patent

active

043066941

ABSTRACT:
A highway crossing warning system for monitoring the motion and predicting the time of arrival of an approaching train at the highway crossing and for detecting the presence of a broken rail in the approach zone by feeding dual frequency signals into the track rails and measuring the track impedances at the two frequencies and the phase angle of the lower of the two frequencies.

REFERENCES:
patent: 3610920 (1971-10-01), Frielinghaus
patent: 3614418 (1971-10-01), Peel
patent: 3696243 (1972-10-01), Risely
patent: 3777139 (1973-12-01), Peel
patent: 3944173 (1976-03-01), Moe et al.
patent: 3974991 (1976-08-01), Geiger
patent: 3977634 (1976-08-01), Smith
patent: 3987989 (1976-10-01), Geiger

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