Fiber-Optic Temperature and Pressure Sensors Applied to Radiofrequency Thermal Ablation in Liver Phantom: Methodology and Experimental Measurements

Figure 13

Principle of operation of DTS measurement. The chart shows data recorded during a RFA experiment. The upper chart shows the Rayleigh signature of the whole fiber span used in the measurement. The DTS connector at 0 m length is visible, as well as the not cleaved output connector at 3.75 m distance from the DTS output. The red part of the chart contains the Rayleigh backscattering acquired in the fiber portion including the parts of fiber enclosed in the measurement chamber as in Figure 12. This part of the trace is processed by the DTS to estimate the temperature variation (bottom chart); the 8 measurement radii are visible as 4 thermal peaks.