Accession Number : AD0475269

Title :   THEORY OF A LINEAR SEMICONDUCTOR THERMOMETER.

Descriptive Note : Report on SUBIC program,

Corporate Author : GENERAL DYNAMICS GROTON CT ELECTRIC BOAT DIV

Personal Author(s) : Melehy, Mahmoud A.

Report Date : SEP 1965

Pagination or Media Count : 28

Abstract : A theory is presented for a linear thermometer employing a semiconductor thermistor and one linear resistance. The cost of this combination at current prices would not exceed approximately $3.00. The linearity of the device is accurate to within 0.5 C in the temperature range -2 C to 38 C. The center of the linear range may be chosen anywhere within the useful reliable range of the thermistor. It is expected that the width of the linear range will be wider the higher its center is above 18 C. Experimental temperature and time responses are included. It was found that thermistors having a listed time constant of one second responded faster if submerged in water moving at a velocity of a few inches per second. Specifically, the rise and fall times of such thermistors are found to be 376 milliseconds. It is expected that this figure may be further reduced by proper mounting and by using smaller thermistors. (Author)

Descriptors :   *SEMICONDUCTOR DEVICES), (*THERMOMETERS, (*THERMISTORS, THERMOMETERS), RESISTORS, COSTS, LINEAR SYSTEMS, ELECTRICAL RESISTANCE, SEMICONDUCTORS, ELECTRICAL CONDUCTIVITY, RESPONSE, WATER.

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE