scholarly journals Temperature and rhodamine B sensing based on fluorescence intensity ratio of Er3+ upconversion emissions

RSC Advances ◽  
2017 ◽  
Vol 7 (76) ◽  
pp. 48494-48500 ◽  
Author(s):  
Jin L. Wu ◽  
Bao S. Cao ◽  
Luis Rino ◽  
Yang Y. He ◽  
Zhi Q. Feng ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Rhodamine B ◽  
Intensity Ratio ◽  
Fluorescence Intensity Ratio ◽  
Upconversion Emissions

Fluorescence intensity ratio technique of upconversion emissions of Er3+ can be used for both temperature and RhB concentration sensing.

Strain-independent temperature measurement by use of a fluorescence intensity ratio technique in optical fiber

2000 ◽  
Vol 39 (18) ◽  
pp. 3050 ◽  
Author(s):  
Scott A. Wade ◽  
Stephen F. Collins ◽  
Kenneth T. V. Grattan ◽  
Gregory W. Baxter
Keyword(s):  
Optical Fiber ◽  
Temperature Measurement ◽  
Fluorescence Intensity ◽  
Intensity Ratio ◽  
Fluorescence Intensity Ratio

scholarly journals Detecting Variable Resistance by Fluorescence Intensity Ratio Technology

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2400 ◽  
Author(s):  
Wanjun Sheng ◽  
Xiangfu Wang ◽  
Yong Tao ◽  
Xiaohong Yan
Keyword(s):  
Fluorescence Intensity ◽  
Intensity Ratio ◽  
Negative Temperature ◽  
Relative Sensitivity ◽  
New Method ◽  
Fluorescence Intensity Ratio ◽  
Time Intervals ◽  
Variable Resistance ◽  
Reduced Graphene ◽  
Short Time

We report a new method for detecting variable resistance during short time intervals by using an optical method. A novel variable-resistance sensor composed of up-conversion nanoparticles (NaYF4:Yb3+,Er3+) and reduced graphene oxide (RGO) is designed based on characteristics of a negative temperature coefficient (NTC) resistive element. The fluorescence intensity ratio (FIR) technology based on green and red emissions is used to detect variable resistance. Combining the Boltzmann distributing law with Steinhart–Hart equation, the FIR and relative sensitivity SR as a function of resistance can be defined. The maximum value of SR is 1.039 × 10−3/Ω. This work reports a new method for measuring variable resistance based on the experimental data from fluorescence spectrum.

Enhanced up-conversion and temperature-sensing behaviour of Er3+ and Yb3+ co-doped Y2Ti2O7 by incorporation of Li+ ions

2014 ◽  
Vol 16 (41) ◽  
pp. 22665-22676 ◽  
Author(s):  
B. P. Singh ◽  
A. K. Parchur ◽  
R. S. Ningthoujam ◽  
P. V. Ramakrishna ◽  
S. Singh ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Intensity Ratio ◽  
Graphical Representation ◽  
Temperature Sensing ◽  
Fluorescence Intensity Ratio ◽  
Sensing Applications ◽  
Co Doped

Graphical representation of Li+ co-doped Y2Ti2O7:Er3+/Yb3+ phosphor showing up-conversion of green and red bands and probing the fluorescence intensity ratio (FIR) for temperature sensing applications.

Measurement of Fluid Temperature Across Micro-Scale Gap Using 2-Color Ratiometric LIF Technique in Combination With Confocal Microscopy

2007 ◽  
Author(s):  
Dong Woon Jeong ◽  
Chi Young Lee ◽  
Sang Yong Lee
Keyword(s):  
Temperature Distribution ◽  
Confocal Microscopy ◽  
Fluorescence Intensity ◽  
Rhodamine B ◽  
Intensity Ratio ◽  
Substantial Reduction ◽  
Fluid Temperature ◽  
External Disturbances ◽  
Measuring Point ◽  
Linear Temperature

In the present work, for non-invasive measurement of the liquid temperature in microchannels the 2-color ratiometric Laser-Induced Fluorescence (LIF) technique was improved by adopting the confocal microscopy. By using this technique, the fluorescent light from the tiny volume around a focusing spot can be selectively detected, and it enables us to measure the local liquid temperatures even at the close vicinity of the walls. To check the general performance of this method, as the preliminary stage, a test section consists of two horizontal plates in different temperatures, separated by a narrow gap filled with a mixture of Rhodamine B (a temperature-sensitive dye) and methanol was made, and the temperature distribution was examined. Based on the relationship between the fluorescence intensity and the temperature, a linear temperature distribution across the gap (by conduction heat transfer) could be confirmed. However, the measured results were subject to external disturbances such as excitation laser intensity fluctuation and irregular reflection of light from the glossy walls. Therefore, in the second stage, to eliminate those external disturbances, another fluorescent dye, Rhodamine 110 (a temperature-insensitive dye), having a different emission spectrum peak (525 nm) from the Rhodamine B (575 nm) was added. In principle, the external disturbance effects cancel out each other if the intensity ratio between Rhodamine B and Rhodamine 110 is used (instead of using Rhodamine B only). To compensate substantial reduction of fluorescence intensity by re-absorption of the fluorescence light emission from Rhodamine 110, which is inherent in the present 2-color thermometry, dependency of the intensity ratio on the depth of the measuring point also has been examined. In summary, the 2-color ratiometric confocal-LIF thermometry was found to be very useful tool to measure the local temperatures of the liquid flow field in micro-fluidic devices.

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