Railway switches and signals – Cab signal or train control – Train defect
Patent
1988-10-11
1990-05-29
Kashnikow, Andres
Railway switches and signals
Cab signal or train control
Train defect
250342, 340682, 340600, 340584, B61K 906
Patent
active
049289101
ABSTRACT:
Overheated railroad journal bearings, wheels, and 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 software comprises a free-running loop Main Program which is subject to several interrupts. The output signal may be digital or analog and is transmitted to remote signal processing equipment for further processing.
REFERENCES:
patent: 3303340 (1967-02-01), Hewett et al.
patent: 3545005 (1970-12-01), Gallagher
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.
Mecca Randall S.
Utterback Jeffery J.
Chase D. A. N.
Harmon Industries, Inc.
Herman Joan Optican
Kashnikow Andres
Le Mark T.
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