Application of the Sagnac interferometer-based strain sensor to an earth movement detection system

1994 ◽  
Author(s):  
Eric Udd ◽  
Ronald G. Blom ◽  
David M. Tralli ◽  
Elric W. Saaski ◽  
Roy Dokka
Keyword(s):  
Detection System ◽  
Strain Sensor ◽  
Movement Detection ◽  
Sagnac Interferometer

Development of a Strain Transferring Sensor Housing for a Lumbar Spinal Fusion Detection System

2006 ◽  
Vol 1 (2) ◽  
pp. 159-164 ◽  
Author(s):  
J. W. Aebersold ◽  
W. P. Hnat ◽  
M. J. Voor ◽  
R. M. Puno ◽  
D. J. Jackson ◽  
...  
Keyword(s):  
Finite Element ◽  
Spinal Fusion ◽  
Detection System ◽  
Spinal Instrumentation ◽  
Strain Sensor ◽  
Internal Surface ◽  
Disc Disease ◽  
Bending Strain ◽  
Exploratory Surgery

Lumbar arthrodesis or spinal fusion is usually performed to relieve back pain, and regain functionality from degenerative disc disease, trauma, etc. Fusion is determined from radiographic images (X-ray) or computed tomography scans, yet these inspection procedures are subjective methods of review. As a result, exploratory surgery is performed if the presence of fusion cannot be confirmed. Therefore, a need exists to provide objective data to determine the presence of fusion that could avoid the cost, pain, and risk of exploratory surgery. One method to achieve this objective is to observe bending strain from spinal rods implanted during surgery. A system has been developed that will attach to the spinal instrumentation rods, transmit strain information wirelessly, and without the use of batteries. Major components of the system include a strain transferring sensor housing, a microelectromechanical (MEMS)-based strain sensor, telemetry circuitry, and antennae. Only discussed herein are the design, testing, and results of the housing without a cover and its ability to transfer strain from the rod to an internal surface where a foil strain gage is attached to characterize strain transfer efficiency. Strain gauges rather than the MEMS sensor were employed for housing characterization due cost and limited availability. Design constraints for the housing are long-term implantation, small size, greater than 95% transfer of bending strain from the spinal rods to the internal strain sensor, and ease of installation. ABAQUS finite element modeling software was employed to develop a working model that was fabricated using polyetheretherkeytone. The housing underwent cycle testing in a material testing system to simulate long-term implantation along with static testing to determine if creep was present. Both series of tests showed that the housing’s response did not degrade over a period of time and there was no indication of creep. The experimental results also validated the results of the ABAQUS finite element model.

A strain sensor based monitoring and damage detection system for a two-span beam bridge

2018 ◽  
pp. 1627-1634
Author(s):  
P. Waibel ◽  
O. Schneider ◽  
H.B. Keller ◽  
J. Müller ◽  
O. Schneider ◽  
...  
Keyword(s):  
Damage Detection ◽  
Detection System ◽  
Strain Sensor ◽  
Beam Bridge

Fiber laser strain sensor based in the measurement of a Sagnac interferometer optical power spectrum

2014 ◽  
Author(s):  
M. Durán Sánchez ◽  
R. I. Álvarez Tamayo ◽  
O. Pottiez ◽  
E. A. Kuzin ◽  
B. Ibarra-Escamilla ◽  
...  
Keyword(s):  
Power Spectrum ◽  
Fiber Laser ◽  
Strain Sensor ◽  
Optical Power ◽  
Sagnac Interferometer

Highly sensitive temperature and strain sensor based on fiber Sagnac interferometer with Vernier effect

2021 ◽  
pp. 127543
Author(s):  
Wujun Zhang ◽  
Xuqiang Wu ◽  
Cheng Zuo ◽  
Lei Gui ◽  
Jinhui Shi ◽  
...  
Keyword(s):  
Strain Sensor ◽  
Sagnac Interferometer ◽  
Highly Sensitive ◽  
Vernier Effect

Automated Clinical Research Mice Movement Detection System

2008 ◽  
Vol 4 (6) ◽  
pp. 63-76
Author(s):  
Emran Mohd Tamil ◽  
Ti Siang Tey ◽  
Mohd Rais Mustafa ◽  
Mohd Yamani Idna Idris ◽  
Mohd Hairul Nizam Md Nasir
Keyword(s):  
Clinical Research ◽  
Detection System ◽  
Movement Detection

Development And Clinical Application Of The Body Movement Detection System

2016 ◽  
Vol 48 ◽  
pp. 798
Author(s):  
Liang-Hsuan Lu ◽  
Female ◽  
Shang-Lin Chiang ◽  
Chueh-Ho Lin ◽  
Wen-Hsu Sung
Keyword(s):  
Clinical Application ◽  
Detection System ◽  
Body Movement ◽  
The Body ◽  
Movement Detection

Saturation in a wide-field, directionally selective movement detection system in fly vision

1984 ◽  
Vol 24 (10) ◽  
pp. 1341-1347 ◽  
Author(s):  
B.P.M. Lenting ◽  
H.A.K. Mastebroek ◽  
W.H. Zaagman
Keyword(s):  
Detection System ◽  
Wide Field ◽  
Movement Detection ◽  
Fly Vision
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