Electromagnetic immune phosphor-tipped fibre-optic thermometers

Calibration traceability can be broken where there are significant, unquantified uncertainties. Thermometry in harsh environments using electrical sensors, such as thermocouples or resistance thermometers, can be unpredictably affected by electro-magnetic sources. For this application, phosphor based temperature sensors with fibre-optic connection have been made following two different approaches – phosphor decay time changes and phosphor emission spectral changes – and tested by bombardment with high energy electrons and by measurements in large magnetic fields. Both sets of tests showed good immunity to exposure, and with magnetic field tests significantly better than a thermocouple. Phosphor thermometry therefore has potential to retain traceability in situations where conventional sensors might fail.当存在显著且未量化的不确定度时，校准溯源性（calibration traceability）可能会断裂。在恶劣环境中使用热电偶（thermocouples）、电阻温度计（resistance thermometers）等电传感器进行温度测量时，其测量结果可能会受到电磁源（electro-magnetic sources）的不可预测干扰。针对该应用场景，研究人员通过两种不同技术路径开发了光纤连接式磷基温度传感器——分别基于磷光衰减时间变化与磷光发射光谱变化，并通过高能电子辐照以及强磁场环境下的测量完成了性能测试。两类测试均表明该传感器具备优异的抗干扰性能，且在强磁场测试中的表现显著优于热电偶。因此，在传统传感器可能失效的场景中，磷基测温技术具备维持校准溯源性的应用潜力。