Novel high spatial resolution strain and temperature sensor using chirped Moiré fibre gratings

1999 ◽  
Author(s):  
Karen E. Chisholm ◽  
Ian Bennion ◽  
Kate Sugden
Keyword(s):  
Spatial Resolution ◽  
Temperature Sensor ◽  
High Spatial Resolution

Spatial Resolution Improvement of Distributed Optical Fiber Raman Temperature Sensor System by Using Amplitude Modification Algorithm

2013 ◽  
Vol 552 ◽  
pp. 393-397
Author(s):  
Zhong Xie Jin ◽  
Hai Peng Zhu
Keyword(s):  
Optical Fiber ◽  
Spatial Resolution ◽  
Temperature Sensor ◽  
High Spatial Resolution ◽  
Sensor System ◽  
Fiber Axis ◽  
Temperature Changes ◽  
Amplitude Coefficient ◽  
Resolution Improvement ◽  
Distributed Optical Fiber

Spatial resolution is an important parameter in distributed optical fiber Raman temperature sensor system (DOFRTS). In this paper, a 10 kilometers long DOFRTS with spatial resolution of about 6 meters is constructed. The spatial resolution is limited by electrical bandwidth of the photodetector circuit and the data acquisition part. The abrupt temperature changes along the fiber axis are treated as temporal pulse signals, and a linear amplitude coefficient modification algorithm is used to improve the spatial resolution. The experimental results show that the temperature amplitudes from 3 meters region to 6 meters can be modified accurately. Therefore, a DOFRTS of high spatial resolution but low system cost could be successfully constructed.

Polysilicon-based flexible temperature sensor for brain monitoring with high spatial resolution

2016 ◽  
Vol 27 (2) ◽  
pp. 025001 ◽  
Author(s):  
Zhizhen Wu ◽  
Chunyan Li ◽  
Jed Hartings ◽  
Sthitodhi Ghosh ◽  
Raj Narayan ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Temperature Sensor ◽  
High Spatial Resolution ◽  
Brain Monitoring

A fast high-spatial-resolution Raman distributed temperature sensor

2014 ◽  
Author(s):  
Y. Chen ◽  
A. H. Hartog ◽  
R. J. Marsh ◽  
I. M. Hilton ◽  
M. R. Hadley ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Temperature Sensor ◽  
High Spatial Resolution ◽  
Distributed Temperature Sensor

High spatial resolution AEM observations of yttrium segregation in chromia scales grown on Co-45%Cr

1986 ◽  
Vol 44 ◽  
pp. 518-519
Author(s):  
K. Przybylski ◽  
A. J. Garratt-Reed ◽  
G. J. Yurek
Keyword(s):  
Spatial Resolution ◽  
Outer Surface ◽  
Maximum Concentration ◽  
High Spatial Resolution ◽  
Reactive Elements ◽  
Chromia Scales

The addition of so-called “reactive” elements such as yttrium to alloys is known to enhance the protective nature of Cr2O3 or Al2O3 scales. However, the mechanism by which this enhancement is achieved remains unclear. An A.E.M. study has been performed of scales grown at 1000°C for 25 hr. in pure O2 on Co-45%Cr implanted at 70 keV with 2x1016 atoms/cm2 of yttrium. In the unoxidized alloys it was calculated that the maximum concentration of Y was 13.9 wt% at a depth of about 17 nm. SIMS results showed that in the scale the yttrium remained near the outer surface.

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