Inductive sensing system for sensing electromagnetic signals from a body

A physiological parameter inductive sensing system for sensing electromagnetic signals emitted from a body in response to electromagnetic excitation signals propagated into said body, the system comprising:

• a loop resonator for inductively coupling with said electromagnetic signals emitted from the body, the resonator comprising a loop antenna and an electrically coupled capacitor, the loop of the antenna having only a single turn of circumferential length l, and
• a signal generation means adapted to excite the resonator to generate the electromagnetic excitation signals having a radial frequency ω for propagating into said body,
• wherein a normalized radial frequency
• ω
• ^
• ≡
• ω
• ω
• ref
• of the electromagnetic excitation signals is from 0.025 to 0.50, where ωref=2πc/l and c=the speed of light;
• and
• a signal processing means configured to sense said electromagnetic signals emitted from the body based on detecting electrical changes in the loop antenna indicative of changes in a measurable inductance of the loop while the loop is generating said excitation signals.