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A micro thin-film thermal conductivity probe is developed to measure thermal conductivity of biological tissues based
on the principle of traditional hot-wire method. The design of this new micro probe consists of a resistive line heating
element on a substrate and a RTD based temperature sensor. The transient time response of the heating element depends
on the thermal conductivity of the surrounding medium and the substrate. A theoretical analysis of the transient
conduction for this configuration where the heater source is sandwiched between two materials (the substrate and the
surrounding medium) shows that the composite thermal conductivity calculated from the temperature versus time
response is simply the average of the thermal conductivity of the two materials. The experiments conducted to measure
thermal conductivity of Crisco and agar gel show a good match with the theoretical and numerical analyses. The
technique demonstrates the potential of the microprobe for in vivo measurements of thermal conductivity of biological
tissues.
Ming Yi,Hrishikesh V. Panchawagh,Ronald J. Podhajsky, andRoop L. Mahajan
"Micromachined hot-wire thermal conductivity probe for biomedical applications", Proc. SPIE 6440, Thermal Treatment of Tissue: Energy Delivery and Assessment IV, 64400O (10 February 2007); https://doi.org/10.1117/12.700814
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Ming Yi, Hrishikesh V. Panchawagh, Ronald J. Podhajsky, Roop L. Mahajan, "Micromachined hot-wire thermal conductivity probe for biomedical applications," Proc. SPIE 6440, Thermal Treatment of Tissue: Energy Delivery and Assessment IV, 64400O (10 February 2007); https://doi.org/10.1117/12.700814