| abstract |
Distance measuring device comprising a transmitter and a receiver, said transmitter being arranged to produce a magnetic field by means of a resonant circuit having a resonant frequency, said receiver being arranged to capture at said resonance frequency of the magnetic field emitted by the transmitter and converting the intensity of the sensed magnetic field to a first signal having an energy value, said transmitter is arranged to produce said magnetic field intermittently, each emission having a predetermined energy, said receiver being connected to a detector arranged to determine, by correlating said first signal with a second predetermined signal having a waveform representative of a signal to be picked up by the receiver, a distance measurement signal representing the distance between the transmitter and the receiver. The device finds application in detectors for sleep disorders or other forms of disease. |