Structural Health Monitoring using Apodized Pi-Phase Shifted FBG: Decoupling Strain and Temperature Effects

Kouhrangiha, Farinaz; Kahrizi, Mojtaba; Khorasani, K.

doi:10.1109/sensors43011.2019.8956638

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…It effectively verifies the feasibility of the model for calibrating and decoupling non-linear effects in the designed sensor. Non-linear calibration methods have as well been studied for FBG sensors [37][38][39], but the calibration processes were obtained via back-propagation method in the studies. The neural network, introduced as decoupling algorithm, in our study derives its theoretical induction model better in the working broadband that the linear calibration methods that are based on traditional least squares and back-propagation fitting methods.…”

Section: Discussionmentioning

confidence: 99%

Development of a Fiber Bragg Grating-Based Force Sensor for Minimally Invasive Surgery–Case Study of Ex-Vivo Tissue Palpation

Gan

Duan

Akinyemi

et al. 2023

IEEE Trans. Instrum. Meas.

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In this paper, a one-dimensional distal force sensor design is proposed for minimally invasive surgery based on fiber Bragg grating (FBG) sensing principle. The sensor is made with a miniaturized force-sensitive flexure within which an optical fiber is embedded. The former includes a spiral elastomer utilized for high axial force sensitivity, while the fiber includes dual FBGs that are tightly suspended around the distal parts of the flexure and along elastomer's centerline, respectively. Theoretical model of the flexure was derived based on its components and a design approach for decoupling strain and temperature cross-effects during sensor usage. In addition, design parameters of the flexure were analyzed on physics-based model optimization using fmincon function, while the static and dynamic properties were analyzed in-silico using finite element method. Further experiments were also carried out to analyze the sensor's performance, and the data obtained was used for calibration study. The latter was done by training a feed-forward neural network designed for predicting the force vs. wavelength-shift relationship. The experimental results show the designed force sensor design can sense force values in a range of 1N with an average relative error less than 2% of full scale. Ex-vivo tissue palpation experiments were further done on pig liver organs to verify the effectiveness and applicability of the proposed sensor design in minimally invasive surgery.

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Section: Discussionmentioning

confidence: 99%

Development of a Fiber Bragg Grating-Based Force Sensor for Minimally Invasive Surgery–Case Study of Ex-Vivo Tissue Palpation

Gan

Duan

Akinyemi

et al. 2023

IEEE Trans. Instrum. Meas.

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“…The proposed techniques fall into three categories. In the rst category, more than one uniform FBG is used [19][20][21] and in the second category, only one special (nonuniform) FBG is adopted for simultaneous measurement [22][23][24][25][26]. Both categories have disadvantages such as the use of more than one uniform FBG, complicated setup and fabrication of special FBGs, excessive use of spectral sources, and di cult accessibility.…”

Section: Introductionmentioning

confidence: 99%

Comparison of FWHM and peak power of FBG spectrum for simultaneous measurement of strain and temperature based on tilted cantilever beam

Mansoursamaei

Gholampour

Malakzadeh

2022

Preprint

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Among the optical fiber sensors, fiber Bragg grating (FBG) has found remarkable attraction and many applications due to its ability to measure all environmental parameters, high accuracy and sensitivity, easy installation, and low price. The sensor's ability to simultaneous measurement of two environmental (physical) parameters, especially strain and temperature, has made it even more demanding. Recently, two techniques based on FWHM and peak power changes of FBG spectrum have been proposed for simultaneous measurement of temperature and strain that use a uniform FBG on a tilted cantilever beam. In this article, we evaluate and compare both techniques and demonstrate that both are equivalent and have almost similar behaviour but do not have the same applications. We find that at the low strain range the peak power technique is more accurate while at the high strain range the FWHM technique has better accuracy. Therefore, in applications such as monitoring civil structures that have a high strain range, it is better to use the FWHM technique and in some delicate industrial applications with a low strain range, the peak power technique is used.

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Comparison of FWHM and peak power techniques for simultaneous measurement of strain and temperature in FBG sensors

2022

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Structural Health Monitoring using Apodized Pi-Phase Shifted FBG: Decoupling Strain and Temperature Effects

Cited by 7 publications

References 12 publications

Development of a Fiber Bragg Grating-Based Force Sensor for Minimally Invasive Surgery–Case Study of Ex-Vivo Tissue Palpation

Development of a Fiber Bragg Grating-Based Force Sensor for Minimally Invasive Surgery–Case Study of Ex-Vivo Tissue Palpation

Comparison of FWHM and peak power of FBG spectrum for simultaneous measurement of strain and temperature based on tilted cantilever beam

Comparison of FWHM and peak power techniques for simultaneous measurement of strain and temperature in FBG sensors

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