La Corporation De L'ecole Polytechnique

Max C Robinson

The thermometer consists of an operational amplifier ratio bridge which is made up of at least one arm having a 3-terminal high impedance temperature sensor one of whose leads being connected to the output of an operational amplifier whose gain has been stabilized and whose output impedance has been rendered negligible by negative feedback. The other lead being connected to the input of an operational amplifier whose gain has been stabilized and whose input impedance has been rendered negligible by negative feedback. Standard arms, comprising standard resistors and capacitors and operational amplifiers whose gain has been stabilized by negative feedback may be connected in parallel with the first arm. A voltage source is connected to the input of the parallel arrangement and a meter measures the output of the parallel arrangement which may be partially or completely balanced by adjusting the values of the standard capacitors and/or resistors and/or by adjusting the relative gainss of the operational amplifiers. The temperature of the 3-terminal high impedance center is calculated from the ratio of output to input voltage measured by the meter and the values of the standard capacitors and resistors and from the relative gain of the operational amplifiers. The operational amplifier ratio bridge may be combined with a transformer bridge.

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Cumana, Venezuela

Max C Robinson