Temperature Calibration at High Pressure Based on Johnson Noise Thermometry

基于约翰逊噪声测温法的高压温度校准

• 批准号: 9526392
• 负责人: Ivan Getting
• 金额: $ 13.67万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-01 至 1999-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526392&HistoricalAwards=false
• 关键词: Temperature; Calibration; Pressure; Based; Johnson

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. ***

这项拨款提供了136,670美元，用于支持科罗拉多大学最近开发的一种气体活塞瓶装置，用于测量高压下地质材料的绝对温度。具体来说，这项名为约翰逊噪声测温的技术测量了电阻（热电偶）在高温下产生的电噪声。由于氩气活塞缸中产生的化学惰性和流体静力环境，可以在气缸中使用精密复杂的仪器来校正压力对热电偶电动势的影响，从而实现与压力无关的温度测量。这一发展将显著扩大压力范围（高达6 GPa），校准热电偶温度测量可以进行。＊＊＊