Low cost interrogation technique for a FBG sensor for combined transverse and longitudinal strain measurement

2008 ◽  
Author(s):  
Z. Brodzeli ◽  
G. W. Baxter ◽  
S. F. Collins ◽  
J. Canning ◽  
M. Stevenson ◽  
...  
Keyword(s):  
Strain Measurement ◽  
Longitudinal Strain ◽  
Low Cost ◽  
Fbg Sensor ◽  
Interrogation Technique

An Embedded FBG Sensor for Dynamic Strain Measurement for a Clamped-Clamped Composite Structure

2005 ◽  
Vol 295-296 ◽  
pp. 21-26 ◽  
Author(s):  
Hang Yin Ling ◽  
Alan Kin Tak Lau ◽  
Li Cheng ◽  
J. Wei ◽  
R.S. Thomson ◽  
...  
Keyword(s):  
Strain Gauge ◽  
Strain Measurement ◽  
Composite Structures ◽  
Longitudinal Strain ◽  
Mechanical Performance ◽  
Fibre Composite ◽  
Excitation Frequency ◽  
Vibration Monitoring ◽  
Dynamic Strain ◽  
Fbg Sensor

A comparison of strain measurement results, from an embedded fibre-optic Bragg grating (FBG) sensor and surface mounted strain gauge, at different vibration frequency ranges and using a clamped-clamped glass fibre composite beam, is presented. It is shown that the FBG sensor is able to precisely measure the peaks at the first-two natural frequency modes compared with the spectrum captured from the strain gauge. The results also demonstrate that the strains measured from the FBG sensor agreed well with the strain gauge at frequencies below 100 Hz. Beyond this value, the actual strain on the beam surface was less than 3µe, and the data extracted from the strain gauge are no longer valid. For a clamped-clamped structure, the longitudinal strain of the beam correlates to its vibration amplitude and excitation frequency. Increasing the frequency results in decreasing the longitudinal strain of the beam and erroneous measurements from the strain gauge resulted. This study provides important information on the feasibility of using embedded FBG sensors as vibration monitoring devices to measure mechanical performance of composite structures.

Strain measurement of steel structure using a novel FBG sensor packaged by titanium alloy slice

2005 ◽  
Author(s):  
Xiujuan Yu ◽  
Youlong Yu ◽  
Yanbiao Liao ◽  
Min Zhang ◽  
Shurong Lai
Keyword(s):  
Titanium Alloy ◽  
Strain Measurement ◽  
Steel Structure ◽  
Fbg Sensor

Design of SAW sensor for longitudinal strain measurement with improved sensitivity

2018 ◽  
Vol 25 (1) ◽  
pp. 351-359
Author(s):  
Juan Ren ◽  
Kanat Anurakparadorn ◽  
Hairong Gu ◽  
Minghui Zhao ◽  
Xueyong Wei
Keyword(s):  
Strain Measurement ◽  
Longitudinal Strain ◽  
Saw Sensor

Novel FBG triangular filter for interrogating a FBG sensor in dynamic strain measurement

2006 ◽  
Vol 2 (5) ◽  
pp. 336-338
Author(s):  
Li-yang Shao ◽  
Jian-fei Song ◽  
A-ping Zhang ◽  
Sai-ling He
Keyword(s):  
Strain Measurement ◽  
Dynamic Strain ◽  
Fbg Sensor

scholarly journals P1319 Speckle tracking echocardiography in patients with acute coronary syndrome: the added value

2020 ◽  
Vol 21 (Supplement_1) ◽  
Author(s):  
D Di Lisi ◽  
A Polizzi ◽  
R Bentivegna ◽  
C Nugara ◽  
M Lunetta ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Cardiac Dysfunction ◽  
Strain Measurement ◽  
Speckle Tracking ◽  
Longitudinal Strain ◽  
Speckle Tracking Echocardiography ◽  
Coronary Artery Stenosis ◽  
Left Ventricular ◽  
Artery Disease

Abstract Background Speckle tracking echocardiography with assessment of left ventricular global longitudinal strain (GLS) allows to identify early signs of cardiac dysfunction. The superiority of GLS in the prediction of all-cause mortality in the general population compared with LVEF is well known; in addiction GLS improves risk stratification and recognize early left ventricular dysfunction in several clinical setting. Purpose the aim of this study was to assess the diagnostic and prognostic role of global and segmental strain in the early identification of cardiac dysfunction in patients with myocardial infarction without persistent ST segment elevation (NSTEMI) and without obvious wall motion abnormalities and to assess the ability to predict the presence/extension of coronary artery disease in this population. Methods an observational study was carried out enrolling 56 patients (median age 66 ± 11,7 years) admitted for NSTEMI. Electrocardiogram, echocardiogram with global and segmental strain measurement (GE’s Automated Function Imaging) and coronary angiography were performed in all patients. In addition we measured territorial longitudinal strain (TLS) defined as the mean of peak systolic strain of the segments pertinent to the perfusion territories of each epicardial coronary arteries in a 17-segment LV model. Results mean LVEF was 53%. We found a significant relationship between GLS values and coronary artery disease extension: GLS -19,1 % ±5,7% in patients without significant coronary artery stenosis, -18,74% ±4,85% in patients with one coronary artery disease, -15,6% ±4,3% in patients with two coronary artery disease, -14,2% ±5,4% in patients with 3 coronary artery disease (p = 0,03). We also found a correlation between territorial strain value and corresponding coronary artery stenosis. TLS was significantly reduced in patients with significant coronary disease of the perfused territory for each artery (LAD TLS 15,1% ± 6,74 % vs -20,73± 4,47 p = 0,002; CX TLS -11,42 % ± 6,59 %,vs -17,06 ± 7,1, p = 0,0 05 , RCA -14,02 % ± 6,00 % vs-17,6 ± 5,21 p = 0,02). At ROC analysis we identified a TLS value of -16,9 % to identify patients with significant stenosis of LAD (sensibility 58,3% and specificity 89,4%, AUC = 0,74, P < 0,001), TLS -18,2% for circumflex artery (sensibility 86,2% and specificity 78,9%, AUC = 0,78, P < 0,001) TLS -18% for right coronary (sensibility 73,9% and specificity 56,2%, AUC = 0,67, P = 0,027) Conclusions global and segmental strain measurement in patients with NSTEMI help to identify the presence and extension of significant coronary artery disease.

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