Field testing of a fiber-optic rotor temperature monitor for power generators

1991 ◽  
Author(s):  
S. K. Brown
Keyword(s):  
Fiber Optic ◽  
Field Testing ◽  
Power Generators ◽  
Temperature Monitor

Design and field testing of a fiber optic pressure sensor for underground water level monitoring

2019 ◽  
Author(s):  
Luca Schenato ◽  
Juan Pablo Aguilar López ◽  
Andrea Galtarossa ◽  
Alessandro Pasuto ◽  
Thom Bogaard ◽  
...  
Keyword(s):  
Water Level ◽  
Pressure Sensor ◽  
Fiber Optic ◽  
Field Testing ◽  
Underground Water ◽  
Underground Water Level ◽  
Level Monitoring ◽  
Water Level Monitoring

scholarly journals Moving Load Identification with Long Gauge Fiber Optic Strain Sensing

2021 ◽  
Vol 16 (3) ◽  
pp. 131-158
Author(s):  
Qingqing Zhang ◽  
Wenju Zhao ◽  
Jian Zhang
Keyword(s):  
Fiber Optic ◽  
Moving Load ◽  
Field Testing ◽  
Maximum Strain ◽  
Load Identification ◽  
Moving Vehicle ◽  
Moving Vehicles ◽  
Structural Responses ◽  
Vehicle Loads ◽  
Moving Load Identification

Moving load identification has been researched with regard to the analysis of structural responses, taking into consideration that the structural responses would be affected by the axle parameters, which in its turn would complicate obtaining the values of moving vehicle loads. In this research, a method that identifies the loads of moving vehicles using the modified maximum strain value considering the long-gauge fiber optic strain responses is proposed. The method is based on the assumption that the modified maximum strain value caused only by the axle loads may be easily used to identify the load of moving vehicles by eliminating the influence of these axle parameters from the peak value, which is not limited to a specific type of bridges and can be applied in conditions, where there are multiple moving vehicles on the bridge. Numerical simulations demonstrate that the gross vehicle weights (GVWs) and axle weights are estimated with high accuracy under complex vehicle loads. The effectiveness of the proposed method was verified through field testing of a continuous girder bridge. The identified axle weights and gross vehicle weights are comparable with the static measurements obtained by the static weighing.

scholarly journals Field Applications of Fiber-Optic Sensors. Part I: Temperature Measurements in a Geothermal Well

1989 ◽  
Vol 43 (3) ◽  
pp. 430-435 ◽  
Author(s):  
S. M. Angel ◽  
D. G. Garvis ◽  
S. K. Sharma ◽  
A. Seki
Keyword(s):  
Fiber Optics ◽  
Fiber Optic ◽  
Field Testing ◽  
Hot Water ◽  
Fiber Optic Sensor ◽  
Geothermal Well ◽  
In Situ Conditions ◽  
Geothermal Wells ◽  
Physical And Chemical

We have initiated a program for developing and field testing fiber-optics-based sensors to monitor in situ physical and chemical parameters in highly corrosive environments, such as geothermal wells, oil wells, and hot-water boiler reactors. Inability to sample hot geothermal wells or to measure the chemical composition of hot brines limits our understanding of in situ conditions in geothermal fields. In this communication, we report preliminary results obtained with a temperature optrode to profile the temperature in a geothermal steam well. To our best knowledge, this is the first time in situ geothermal well measurements have been made with the use of a fiber-optic sensor.

Field testing of fiber-optic distributed acoustic sensing (DAS) for subsurface seismic monitoring

2013 ◽  
Vol 32 (6) ◽  
pp. 699-706 ◽  
Author(s):  
Thomas M. Daley ◽  
Barry M. Freifeld ◽  
Jonathan Ajo-Franklin ◽  
Shan Dou ◽  
Roman Pevzner ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Field Testing ◽  
Seismic Monitoring ◽  
Acoustic Sensing ◽  
Distributed Acoustic Sensing

scholarly journals Advanced Deepwater Monitoring System

2013 ◽  
Author(s):  
David Brower ◽  
John D. Hedengren ◽  
Reza Asgharzadeh Shishivan ◽  
Alexis Brower
Keyword(s):  
Shear Strength ◽  
Adhesive Bonding ◽  
Fiber Optic ◽  
Tensile Load ◽  
Field Testing ◽  
Alloy Coating ◽  
Structural Testing ◽  
Fiber Optic Sensor ◽  
Coupling Methods ◽  
Optic Sensor

This study investigates new methods to improve deepwater monitoring and addresses installation of advanced sensors on “already deployed” risers, flowlines, trees, and other deepwater devices. A major shortcoming of post installed monitoring systems in subsea is poor coupling between the sensor and structure. This study provided methods to overcome this problem. Both field testing in subsea environments and laboratory testing were performed. Test articles included actual flowline pipe and steel catenary risers up to twenty-four inches in diameter. A monitoring device resulting from this study can be installed in-situ on underwater structures and could enhance productivity and improve safety of offshore operations. This paper details the test results to determine coupling methods for attaching fiber optic sensor systems to deepwater structures that have already been deployed. Subsea attachment methods were evaluated in a forty foot deep pool by divers. Afterword, structural testing was conducted on the systems at the NASA Johnson Space Center. Additionally a 7,000 foot deep sensor station was attached to a flowline with the aid of a remote operated vehicle. Various sensor to pipe coupling methods were tested to measure tensile load, shear strength and coupling capability. Several adhesive bonding methods in a subsea environment were investigated and subsea testing yielded exceptionally good results. Tensile and shear properties of subsea application were approximately 80 percent of those values obtained in dry conditions. Additionally, a carbide alloy coating was found to increase the shear strength of metal to metal clamping interface by up to 46 percent. This study provides valuable data for assessing the feasibility of developing the next generation fiber optic sensor system that could be retrofitted onto existing subsea pipeline structures.

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