| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an electric field sensor wherein adjustment is easy so that reception of a weak electric field is possible and the sensor is excellent in reliability and durability. SOLUTION: The electric sensor includes a reception antenna 5 for receiving an input signal, a sensor head 1 structured so that incident light varies according to electric field strength of the input signal to be emitted, a coaxial cable 6 for connecting between the sensor head 1 and the reception antenna 5, a light source 7 of light incident to the sensor head 1, a light detector 8 for detecting the emitted light from the sensor head 1, an optic fiber connecting among the sensor head 1, the light source 7 and the light detector 8, and an impedance conversion circuit 4 between the coaxial cable 6 and the sensor head 1, wherein the impedance conversion circuit 4 and a modulation electrode of the sensor head 1 constitutes a series resonance circuit.</p> |
