title: Dielectric properties of blood: an investigation of temperature dependence.
abstract: We have investigated the temperature dependence of the electrical parameters (permittivity and conductivity) of blood. The measuring system, composed of an impedancemeter (HP 4291 A), an open-ended coaxial line and a temperature controlling set, was designed for dielectric measurement in the frequency range of 1 MHz to 1 GHz. Measurements were performed on ex vivo blood of humans and animals (cow and sheep). The results obtained show the weak sensibility and a change of sign of the temperature coefficient of the relative permittivity (about 0.3% degrees C(-1) at 1 MHz and -0.3% degrees C(-1) at 1 GHz). The conductivity presents a more significant variation (of the order of 1% degrees C(-1) over the whole operating frequency range.
authors.affiliation: Laboratoire d'Instrumentation Electronique de Nancy, Faculté des Sciences, Vandoeuvre les Nancy, France.
authors.forename: F
authors.initials: F
authors.lastname: Jaspard
authors.forename: M
authors.initials: M
authors.lastname: Nadi
mesh_terms: D000818:Animals; D001769:Blood; D002417:Cattle; D017097:Electric Impedance; D004574:Electromagnetic Fields; D008954:Models, Biological; D012756:Sheep; D013057:Spectrum Analysis / Q000295:instrumentation / Q000379:methods*; D013696:Temperature