Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7135261 | Sensors and Actuators A: Physical | 2016 | 5 Pages |
Abstract
An optical temperature sensor (OTS) based on the fluorescence intensity ratio (FIR) method of Eu3+ in LiNbO3 (LN) single crystal has been developed, and this OTS can effectively avoid the fluorescence measurement disturbance due to the low scattering factor of the host LN single crystal. The sensitivity achieved here is as high as 3916/T2 (4%Â Kâ1 at 303Â K) in the temperature range of 303-723Â K by using FIRs between 5D0-7F2 (625Â nm) and 5D1-7F1 (541Â nm), and it is significantly superior compared with using the FIRs between 5D1-7F1 and 5D0-7F1 of traditional thermally coupled levels (TCLs). Because of the high fluorescence efficiency of this sample, strong fluorescence intensity with high signal to noise ratio (SNR) is achieved under a low excitation power density of only 0.2Â W/cm2. In our OTS system the average acquisition time of temperature is less than 2Â s and the resolution is as high as 0.3Â K at 573Â K.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Zhang Liang, Feng Qin, Yangdong Zheng, Zhiguo Zhang, Wenwu Cao,