Mr. Ramzi Ben Hassen Profile

Ramzi Ben Hassen

at Univ Libre de Bruxelles

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Proceedings Article | 1 April 2020 Presentation + Paper

FBGs temperature sensor for electrosurgical knife subject to high voltage and high-frequency current

Ramzi Ben Hassen, Christophe Caucheteur, Alain Delchambre

Proceedings Volume 11354, 1135423 (2020) https://doi.org/10.1117/12.2555013

KEYWORDS: Fiber Bragg gratings, Temperature metrology, Tissues, Calibration, Cameras, Temperature sensors, Resistance, Electrodes, Sensors, Endoscopy

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Fiber Bragg grating (FBG) based sensors are widely used in very diverse fields ranging from health structural monitoring in civil and aerospace areas to more recent medical applications in the field of diagnosis in different specialities such as cardiology and biomechanics, among others. Their intrinsic properties of strain and temperature sensitivity and their ease of use make FBGs high potential sensors for research purpose. The proposed study aims to evaluate and assess the temperature increase due to heating at the tip of an electrosurgical knife subject to current at high voltage and high frequency in different conditions and verify the feasibility of using FBGs as temperature sensor in this application. For this purpose, an electrosurgical knife composed of a metal conductor and a plastic shaft on top of which 3 FBGs are placed is used. The latter ones are situated and fixed on the circumference of the shaft equally distributed at 120° from each other. To avoid strain interference in the measurements of the shift in Bragg wavelength, the metal conductor is kept fixed. After calibrating the FBGs, different experiments are conducted where the knife is used to heat a specific biological material using a high voltage generator and a thermal camera for measurements verification. The tests showed promising results which demonstrate that FBGs are easy to calibrate in temperature and robust to measure variation of temperature in the surrounding of an electrosurgical knife.

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