Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1994-12-01
1997-08-12
Bennett, G. Bradley
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
374110, G01K 716, G01K 736
Patent
active
056558406
ABSTRACT:
An elongate temperature sensor comprises two electrical conductors having temperature sensitive insulating material between them whose resistance and capacitance varies with temperature but according to respectively different known relationships. An alternating waveform is applied across the sensor through a known resistor. The amplitudes of the voltage waveforms developed across the known resistor and across the sensor are compared and the phase difference between them measured to determine the corresponding resistance and capacitance values of the sensor. The measured value of one parameter is then substituted into the respective known relationship to produce a corresponding temperature value for the sensor. This temperature value is then substituted into the relationship for the other parameter to calculate a notional value for that parameter. If that notional value differs from the measured value, this is used to produce an indication that the sensor is not being uniformly heated but has an overheated sectional part. By means of further processing, the length and position of the overheated section and its actual temperature can be determined.
REFERENCES:
patent: 3059229 (1962-10-01), Tava et al.
patent: 3064245 (1962-11-01), Lindberg, Jr.
patent: 3665766 (1972-05-01), Johnston
patent: 4361799 (1982-11-01), Lutz
patent: 4372693 (1983-02-01), Lutz
patent: 4763113 (1988-08-01), Sassier
patent: 5226729 (1993-07-01), Alford
patent: 5257864 (1993-11-01), Nomura
Bennett G. Bradley
Kidde Fire Protection Limited
LandOfFree
Temperature detecting methods and systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Temperature detecting methods and systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temperature detecting methods and systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-155876