Self-calibrating hot wheel detector for railroads

Details Self-calibrating hot wheel detector for railroads Self-calibrating hot wheel detector for railroads

1990-12-12

1992-03-31

Cuchlinski, Jr., William A.

Thermal measuring and testing

Thermal calibration system

By thermal radiation emitting device

374121, 374128, G01K 1500

Patent

active

051002434

ABSTRACT:
This invention relates to a device for monitoring the temperature of the wheels of passing railroad cars. More particularly, this device includes a self-calibration function wherein a predetermined heat source is attached to the device, a fixed amplifier amplifies the resulting electric signal so as to generate a signal comparable in magnitude to that generated by a passing train, a variable gain amplifier further amplifies the signal, and the resulting signal is converted to a digital signal. The digital signal is used as a signal to the feedback input of a variable gain amplifier. In response to the digital signal, the variable gain amplifier adjusts its gain until the feedback signal reaches a predetermined value.

REFERENCES:
patent: 3151827 (1964-10-01), Gallagher et al.
patent: 3303340 (1967-02-01), Hewett et al.
patent: 3451254 (1969-06-01), Maley
patent: 3461284 (1969-08-01), Joy
patent: 3998549 (1976-12-01), Pusch et al.
patent: 4283934 (1981-08-01), Seiss
patent: 4820057 (1989-04-01), Berndt

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