Accession Number : ADD001811

Title :   Temperature Measuring System Having Sensor Time Constant Compensation.

Descriptive Note : Patent,


Personal Author(s) : Brown,Neil L

Report Date : 01 Jul 1975

Pagination or Media Count : 7

Abstract : The patent relates to a device whereby the temperature of a fluid medium is measured by a platinum resistance temperature sensor which is in one arm of a first AC excited bridge and by a thermistor which is in one arm of a second similarly excited bridge. The output of the second bridge is processed so as to provide a correction signal whose amplitude varies as the response of a simple high-pass RC filter to a step DC input. This correction signal has the same time constant as the platinum resistor and is combined with the output of the first bridge to yield a composite temperature signal which has the stability of the platinum resistor and the speed of response of the thermistor. An application of the patent is to make precise and accurate seawater temperature measurements at a high data rate.

Descriptors :   *Temperature measuring instruments, *Patents, *Oceanographic equipment, Thermistors, Electric bridges, Resistance thermometers, Signal processing

Subject Categories : Physical and Dynamic Oceanography
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE