Temperature Calibration at High Pressure Based on Johnson Noise Thermometry

小行星9526392 这笔赠款提供了136 670美元，用于资助科罗拉多大学开发一种技术，在最近开发的气体活塞气缸装置中测量地质材料在高压下的绝对温度。 具体而言，该技术，题为约翰逊噪声测温测量电阻器（热电偶）在高温下产生的电噪声。 由于氩气活塞气缸中产生的化学惰性和流体静力学环境，可以在气缸中使用精密和复杂的仪器来校正压力对热电偶电动势的影响，从而能够测量与压力无关的温度。 这一发展将显著扩大压力范围（高达6 GPa），可进行校准热电偶温度测量。 ***

9526392 Getting This grant provides $136,670 in support of the costs of developing a technique to measure the absolute temperature of geological materials at high-pressures in a recently developed gas-piston cylinder apparatus at the University of Colorado. Specifically, the technique, entitled Johnson noise thermometry measures the electrical noise generated in a resistor (thermocouple) at elevated temperature. Due to the chemically inert and hydrostatic environment generated in the argon gas- piston cylinder, delicate and complex instumentation can be used in the cylinder to make corrections for the effect of pressure on thermocouple emf thus enabling measurement of temperature that is independent of the pressure. This development will significantly expand the range of pressure (up to 6 GPa) for which calibrated thermocouple temperature measurements can be made. ***