Railway switches and signals – Cab signal or train control – Train defect
Patent
1989-09-29
1991-10-29
Graham, Matthew C.
Railway switches and signals
Cab signal or train control
Train defect
250342, 340682, 340600, 340584, B61K 906
Patent
active
050608908
ABSTRACT:
Overheated railroad journal bearings, wheels, and other wheel components on a moving or stationary railroad train are detected by amplifying the current signal from an infrared radiation sensor comprising a pyroelectric cell. A reference temperature is sensed by chopping the incident infrared radiation with an asynchronous shutter that momentarily closes at successive time spacings of shorter duration than the scanning period of the sensor. The amplified signal is converted to a digital signal and processed by a microcontroller and associated hardware and software. The detector automatically and periodically calibrates itself and compensates the temperature signals for any temperature difference between the ambient external temperature and the temperature inside the detector housing. The output signal may be digital or analog.
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patent: 3733499 (1973-05-01), Deis et al.
patent: 4068811 (1978-01-01), Caulier
patent: 4765413 (1988-08-01), Spector et al.
patent: 4813003 (1989-03-01), Cox et al.
patent: 4928910 (1990-05-01), Utterback et al.
Mecca Randall S.
Utterback Jeffrey J.
Chase D. A. N.
Graham Matthew C.
Harmon Industries, Inc.
Le Mark T.
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