Temperature measurements using a microoptical sensor based on whispering gallery modes
Temperature measurements using a microoptical sensor based on whispering gallery modes
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DOI：
10.2514/1.20910
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发表时间：
2006-10-01
期刊：
影响因子：
2.5
通讯作者：
Otugen, M. V.
中科院分区：
文献类型：
--
作者：
Guan, G.;Arnold, S.;Otugen, M. V.
温度测量是使用一种新型的微光学传感器的基础上的电介质微球，激发耦合光从光纤。该技术利用了通常被称为回音壁模式的谐振频率的形态依赖性偏移。微球温度的变化导致球体的尺寸和折射率的变化，这导致谐振频率的偏移。通过监测这种变化，可以确定球体周围环境的温度。回音壁模式的变化是通过扫描耦合到光纤一端的可调谐二极管激光器，并通过另一端的光电二极管监测透射光谱来观察的。当微球与光纤的裸露部分接触时，光学模式被观察为通过光纤传输的光的强度的下降。使用这种新技术在空气和水中进行了温度测量。将微光学传感器的测量结果与热电偶的测量结果进行了比较，两组结果之间具有良好的一致性
Temperature measurements were made using a novel microoptical sensor based on dielectric microspheres that are excited by coupling light from optical fibers. The technique exploits the morphology-dependent shifts in resonant frequencies that are commonly referred to as the whispering gallery modes. A change in the temperature of the microsphere leads to a change in both the size and the index of refraction of the sphere which results in a shift of the resonant frequency. By monitoring this shift, the temperature of the environment surrounding the sphere can be determined. The whispering gallery mode shifts are observed by scanning a tunable diode laser that is coupled into the optical fiber on one end and monitoring the transmission spectrum by a photodiode on the other. When the microsphere is in contact with a bare section of the fiber, the optical modes are observed as dips in the intensity of the light transmitted through the fiber. Temperature measurements were made in both air and water using this novel technique. Measurements by the microoptical sensor were compared to those by thermocouples with good agreement between the two sets of results