B - Operations – Transporting – 61 – K
Patent
B - Operations, Transporting
61
K
340/155.2
B61K 9/06 (2006.01) G01J 5/34 (2006.01)
Patent
CA 1109543
ABSTRACT OF THE DISCLOSURE An apparatus for determining the temperature of rail- road car wheel journals (i.e., "hotbox" detector) includes a sensor means 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 sensing means exhibits a nonlinear gain response to different frequencies of input signals and comprensation is provided by coupling the out- put of the sensor means to a differentiating circuit which has a similar but relatively negative gain response. The output of the differentiating means 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 pre- determined value.
298840
Company General Electric
Eckersley Raymond A.
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