| 摘要 |
<p>PURPOSE:To prevent occurrence of turbulence of a signal waveform by a method wherein a difference between first and second electric signals outputted from first and second light-sensing elements respectively is made to be an output of a magnetic field sensor. CONSTITUTION:Two lights emitted from first and second emission elements 3 and 3' and directed reversly to each other are made to enter a polarized light selecting means 2 provided with a pair of polarizers 10 and 11 having polarization axes intersecting each other, respectively, and with a Faraday element 6 formed of one magnetic garnet interposed between these polarizers 10 and 11. First and second electric signals generated from these two lights in a first light-sensing element 4 and a second light-sensing element 4' (these electric signals are disordered sine waves which have such reverse directions of oscillation and equal amplitudes as two sine waves of curves 19 and 20 when their components of normal sine waves due to a Faraday effect are compared with each other and, besides, signals of double cycles due to a Cotton- Mouton effect are equal completely in terms of both a phase and a strength.) are subjected to subtraction, and thereby only the electric signal due to the Faraday effect is detected.</p> |
