Fiber optic temperature sensor for use in experimental microwave hyperthermia

Temperature sensing in microwave heating of concrete using fibre Bragg grating sensors

“…The use of optical fibres as temperature sensors has been investigated by many researchers in different fields (Hirayama and Sano, 2000;Huang et al, 2003;Jung et al, 1998;Kersey and Berkoff, 1992;Kisaka et al, 2004;Lagakos et al, 1981;Pennisi et al, 2002;Protopopov et al, 2000;Ramesh and Wong, 1999;Seo and Kim, 1999;Silva et al, 2004;Wang et al, 2001;Lin et al, 2004;Zhan et al, 2004Zhan et al, , 2005. Several researchers developed optical-fibre-based temperature sensors by replacing a length of the optical fibre's cladding with a material that has a temperature-dependent refractive index (Pennisi et al, 2002).…”

“…Several researchers developed optical-fibre-based temperature sensors by replacing a length of the optical fibre's cladding with a material that has a temperature-dependent refractive index (Pennisi et al, 2002). Variation of the refractive index may lead to variation of the optical power transmitted along the fibre, which can be related to temperature change.…”

“…The main reasons for this are electromagnetic interference caused by induced currents and voltages in metallic conductors and local heating of the sensor due to electromagnetic induction (Pennisi et al, 2002). In order to reduce or eliminate errors due to such effects, temperature sensors based on optical fibres have been studied.…”

“…Optical fibre sensors are one of the well-known sensors that are virtually immune to electromagnetic fields (Degamber and Fernando, 2003;McSheny et al, 2004;Pennisi et al, 2002;Schmaup et al, 1995). Because of their glass-based nature, optical fibres do not interact with the electromagnetic field and hence maintain their accuracy in the presence of microwaves.…”

Fiber Optics for Thermometry in Hyperthermia Therapy

“…The experiments are carried out inside an anechoic chamber to avoid the external electromagnetic interferences and at the liberation of the energy radiation to the environment. The thermometry system that is described is part of this automated laboratory (Pennisi et al, 2002). This system measures the temperature inside the phantom, which is heated through the electromagnetic and ultrasonic fields radiations that are being carried out.…”