scholarly journals Application of Sapphire-Fiber-Bragg-Grating-Based Multi-Point Temperature Sensor in Boilers at a Commercial Power Plant

Sensors ◽  
2019 ◽  
Vol 19 (14) ◽  
pp. 3211 ◽  
Author(s):  
Shuo Yang ◽  
Daniel Homa ◽  
Hanna Heyl ◽  
Logan Theis ◽  
John Beach ◽  
...  
Keyword(s):  
Power Plant ◽  
Temperature Sensor ◽  
Single Point ◽  
Temperature Limit ◽  
Measurement Range ◽  
Maximum Temperature ◽  
Test Duration ◽  
Point Temperature ◽  
Field Environment ◽  
Sapphire Fiber

Readily available temperature sensing in boilers is necessary to improve efficiencies, minimize downtime, and reduce toxic emissions for a power plant. The current techniques are typically deployed as a single-point measurement and are primarily used for detection and prevention of catastrophic events due to the harsh environment. In this work, a multi-point temperature sensor based on wavelength-multiplexed sapphire fiber Bragg gratings (SFBGs) were fabricated via the point-by-point method with a femtosecond laser. The sensor was packaged and calibrated in the lab, including thermally equilibrating at 1200 °C, followed by a 110-h, 1000 °C stability test. After laboratory testing, the sensor system was deployed in both a commercial coal-fired and a gas-fired boiler for 42 days and 48 days, respectively. The performance of the sensor was consistent during the entire test duration, over the course of which it measured temperatures up to 950 °C (with some excursions over 1000 °C), showing the survivability of the sensor in a field environment. The sensor has a demonstrated measurement range from room temperature to 1200 °C, but the maximum temperature limit is expected to be up to 1900 °C, based on previous work with other sapphire based temperature sensors.

Thermal Wellbore Failure Detection Case Studies: A High Temperature Multi-Finger Caliper Surveillance Approach

2021 ◽  
Author(s):  
Reza Khastoo ◽  
Sameer Mostafa ◽  
Alastair Fraser
Keyword(s):  
High Temperature ◽  
Empirical Studies ◽  
Failure Detection ◽  
Temperature Limit ◽  
Measurement Range ◽  
Maximum Temperature ◽  
Metal Loss ◽  
High Resolution Data ◽  
Vertical Well ◽  
Data Acquistion

Abstract Cooling of thermal wellbores such as steam assisted gravity drainage (SAGD) and cyclic steam stimulation (CSS) wells, is a common prerequistite to allow deployment of logging instruments due to the temperature limitation of imaging instruments’ electronics (<150°C). This paper presents a memory caliper technology housed in a thermoshield that can perform at up to 220°C, with the acquired data used to evaluate the integrity of tubulars and completion items (metal loss, deposition, deformation, and gap/hole damage), negating the need for cooling before deployment. Two cases are presented. One is a SAGD well with liner screens across the lateral section. The memory multi-finger caliper was deployed using coiled tubing and the data were successfully obtained across the lateral section with a maximum recorded temperature of 169°C. The second example is a vertical well in a steam flood field. Because of the uncertainty over the downhole temperature at the time of the well intervention, a temperature sensor was deployed in surface read-out mode above the caliper. This ensured the 220° temperature limit of the caliper would not be breached, and a maximum temperature of 208°C was recorded. The data confirm the feasibility of acquiring high accuracy/high resolution data from thermal wellbores without having to resort to manipulative cooling techniques to attain a temperature below 150°C. Enlargement of a limited entry perforation (LEP) was observed in the horizontal well and buckling was clearly detected in the vertical well. The broad measurement range of the caliper – 1.85" – 7.2" – enabled both the tubing and liner to be logged in a single well intervention, which facilitated a swift resumption of of steam injection activities. Ultimately, the high temperature MFC's ability to minimize deliberate cooling the thermal wellsbore before deployment, has time and cost saving implications throughout the life cycle of the well. Much of the existing literature examining downhole data acquistion in thermal wells, for the diagnosis of wellbore integrity issues, has relied on technologies that are unable to withstand temperatures much greater than 150°C. The ability to execute well interventions for data acquistion at higher temperatures offers the potential for empirical studies that compare the status and integrity of the wellbore completion in thermal and cooled conditions.

Remote detection of the swarming of honey bee colonies by single-point temperature monitoring

2016 ◽  
Vol 148 ◽  
pp. 76-80 ◽  
Author(s):  
Aleksejs Zacepins ◽  
Armands Kviesis ◽  
Egils Stalidzans ◽  
Marta Liepniece ◽  
Jurijs Meitalovs
Keyword(s):  
Honey Bee ◽  
Single Point ◽  
Temperature Monitoring ◽  
Remote Detection ◽  
Point Temperature ◽  
Bee Colonies

Blue light-emitting-diode-pumped point temperature sensor based on a fluorescence intensity ratio in Pr3+: ZBLAN glass

1997 ◽  
Vol 4 (1) ◽  
pp. A89-A91 ◽  
Author(s):  
Eric Maurice ◽  
Gerard Monnom ◽  
Greg W. Baxter ◽  
Scott A. Wade ◽  
Bill P. Petreski ◽  
...  
Keyword(s):  
Blue Light ◽  
Fluorescence Intensity ◽  
Temperature Sensor ◽  
Intensity Ratio ◽  
Light Emitting Diode ◽  
Fluorescence Intensity Ratio ◽  
Light Emitting ◽  
Point Temperature ◽  
Zblan Glass ◽  
Diode Pumped

scholarly journals Development of an Optical Sensor Head for Current and Temperature Measurements in Power Systems

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Fábio V. B. de Nazaré ◽  
Marcelo M. Werneck ◽  
Rodrigo P. de Oliveira ◽  
D. M. Santos ◽  
R. C. Allil ◽  
...  
Keyword(s):  
Power Systems ◽  
Transmission Lines ◽  
Laboratory Tests ◽  
Single Point ◽  
Physical Parameters ◽  
Measurement Reliability ◽  
Point Temperature ◽  
Sensor Head ◽  
Demodulation Method ◽  
A Current

The development of a current and temperature monitoring optical device intended to be used in high-voltage environments, particularly transmission lines, is presented. The system is intended to offer not only measurement reliability, but to be also practical and light weighted. Fiber Bragg gratings (FBGs) are employed in the measurement of both physical parameters: the current will be acquired using a hybrid sensor head setup—an FBG fixed on a magnetostrictive rod—while a single-point temperature information is provided by a dedicated grating. An inexpensive and outdoor-suitable demodulation method, such as the fixed filter technique, should be used in order to improve the instrumentation robustness, avoiding expensive and complex auxiliary electronics. The preliminary results for laboratory tests are also discussed.

Advanced fabrication and calibration of high-temperature sensor elements based on sapphire fiber Bragg gratings

2014 ◽  
Author(s):  
Tino Elsmann ◽  
Tobias Habisreuther ◽  
Manfred Rothhardt ◽  
Reinhardt Willsch ◽  
Hartmut Bartelt
Keyword(s):  
High Temperature ◽  
Temperature Sensor ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
High Temperature Sensor ◽  
Sapphire Fiber

Fabrication of a Miniaturized Thin-Film Temperature Sensor on a Sapphire Fiber Tip

2011 ◽  
Vol 11 (12) ◽  
pp. 3406-3408 ◽  
Author(s):  
Jiajun Wang ◽  
E. M. Lally ◽  
Bo Dong ◽  
Jianmin Gong ◽  
Anbo Wang
Keyword(s):  
Thin Film ◽  
Temperature Sensor ◽  
Sapphire Fiber
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