Temperature Calibration at High Pressure Based on Johnson Noise Thermometry

9526392获得这笔赠款将提供136 670美元，用于资助开发一种技术，在科罗拉多大学最近开发的气体活塞式钢瓶装置中测量高压下地质材料的绝对温度。具体地说，这项名为约翰逊噪声测温的技术测量了高温下电阻(热电偶)中产生的电噪声。由于在气体活塞式钢瓶中产生的化学惰性和静压环境，可以在钢瓶中使用精密而复杂的仪器来修正压力对热电偶电势的影响，从而能够测量与压力无关的温度。这一发展将显著扩大可进行校准热电偶温度测量的压力范围(最高可达6 Gpa)。***

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. ***