Hotbox detector

Details Hotbox detector Hotbox detector

1977-04-28

1978-01-17

Blix, Trygve M.

Railway switches and signals

Cab signal or train control

Train defect

73355R, 116DIG38, 246DIG2, 250338, 340228R, 340231, 340269, B61K 906

Patent

active

040688119

ABSTRACT:
An apparatus for determining the temperature of railroad car wheel journals (i.e., "hotbox" detector) includes a sensor including a pyroelectric cell responsive to infrared radiation signals, which are focused onto the cell, to output voltage signals as a function of the radiation signals inputted thereto. The sensor exhibits a nonlinear gain response to different frequencies of input signals and compensation is provided by coupling the output of the sensor to a differentiating circuit which has a similar but relatively negative gain response. The output of the differentiating circuit is a substantial voltage replica of the infrared input signal and this voltage signal may be applied to a suitable utilization device such as one which records journal temperature and/or provides a suitable alarm when a sensed journal temperature exceeds a predetermined value.

REFERENCES:
patent: 2920485 (1960-01-01), Derganc
patent: 3303340 (1967-02-01), Hewett
patent: 3999069 (1976-12-01), Taylor

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