BIOELECTRIC POTENTIAL DETECTOR AND TRANSCEIVER

PROBLEM TO BE SOLVED: To detect a bioelectric potential in a natural state without being affected by the potential of the ground and to convert the potential to data to be transmitted. SOLUTION: A field of intensity corresponding to the potential of a region to be measured with the potential of the hands of a patient as reference is applied to the electrooptic crystal EO of an optical modulator LC1. The electrooptic crystal EO polarizes and modulates circularly polarized light from a 1/4 waveform plate QWP to elliptically polarized light having ovality corresponding to the intensity of the electric field. The elliptically polarized light is made incident on a polarizing plate POL to transmit only specific linear polarized component, and the component is converted to intensity-modulated light and is emitted to a photodetector PD. The photodetector PD converts the intensity-modulated light to current having a magnitude corresponding to the intensity. An I/O circuit 102 converts an electric signal obtained by being amplified by a signal processing circuit 101 to data and stores it in a data storage part 103. A signal generator 104 generates the electric signal corresponding to the data stored in the data storage part 103 and applies it to an electrode P1. COPYRIGHT: (C)2007,JPO&INPIT