Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1986-04-21
1987-10-13
Yasich, Daniel M.
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
307310, 374144, G01K 716, G01K 1302
Patent
active
046995200
ABSTRACT:
A temperature measuring device for recording large changes in temperature, especially for recording the temperatures in an internal combustion engine. An NTC resistor is connected with a constant source of voltage via a dropping resistor and the drop in voltage across the NTC resistor is a gauge for the temperature. Because of the characteristics of the NTC resistor, measurement of low temperatures is possible with a high ohmic dropping resistor but accurate measurement of high temperatures is not possible. The opposite is true when using a low ohmic dropping resistor. In one embodiment of the disclosed device, it is possible to switch at a predetermined frequency the resistance of the dropping resistor circuit between a high ohmic and a low ohmic value, whereby the correspondingly produced output signal indicates the recorded temperature over the whole temperature range with a satisfactory degree of accuracy. Alternatively, the recorded temperature output signal may be fed to a comparer computer together with a control frequency to produce an output voltage with a probe ratio which is synchronized with the average recorded temperature thereby obtaining a greater gradient at the high and low temperature portions of the voltage versus temperature curve and more accurate measurement of high and low temperatures.
REFERENCES:
patent: 3106645 (1963-10-01), Kaufman
patent: 3538771 (1970-11-01), Akeley
patent: 3587318 (1971-06-01), Belugou et al.
patent: 3987318 (1976-10-01), Meijer
patent: 4297851 (1981-11-01), Padlock et al.
Kloeckner-Humboldt-Deutz AG
Schwab Charles L.
Yasich Daniel M.
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