| 单词 | resistance thermometer |
| 释义 | resistance thermometer(resistance pyrometer) A thermometer that relies on the increase of electrical resistance of a metal wire with rising temperature, according to the approximate relationship R = R0(1 + aT + bT2) , where R is the resistance of the wire at temperature T and R0 is the resistance of the wire at a reference temperature, usually 0°C; a and b are constants characteristic of the metal of the wire. The metal most frequently used is platinum and the platinum resistance coil is usually incorporated into one arm of a Wheatstone bridge. The effect of the temperature change on the leads carrying current to the platinum coil is compensated by including a pair of dummy leads within the casing carrying the coil. See also thermistor |
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