G - Physics – 01 – D
Patent
G - Physics
01
D
340/102, 73/168
G01D 21/02 (2006.01) G01D 1/10 (2006.01) G01K 3/08 (2006.01) G01K 7/16 (2006.01)
Patent
CA 1125407
BFN 6614 DIFFERENTIAL MEASURING SYSTEM Abstract of the Disclosure An apparatus for measuring the differential be- tween a plurality of physical quantities, such as tem- perature, includes transducers 10 and 12 each positioned to sense the physical quantity. The transducers are preferably of the resistive or nonreactive variety. A single, controlled current power source 15 is connected sequentially to the transducers through a switching cir- cuit 20. Each transducer is connected to the switching circuit and to an amplifier 40 through four-conductor cables 35, 45. The amplifier is therefore connected continuously to the transducers to sense both the volt- age developed thereacross when the transducer is con- nected to the source of current through the switching circuit and also to sense continuously any other voltages, such as those that might be produced by thermocouple ef- fects. The output of the amplifier 40 is applied to a linearizing circuit 50 whose output is used to control the magnitude of the output current of the current source 15 in response to the absolute resistance of each trans- ducer. The switching circuit 20 is controlled by a clock 30 the output of which also controls a synchronous de- modulator 55 which is connected to the output of the amplifier means for sampling the peak-to-peak output of the amplifier after all transients have decayed.
339757
Gowling Lafleur Henderson Llp
Yellow Springs Instrument Company Inc.
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