| 摘要 |
<p>PURPOSE:To achieve a simultaneous measurement of the electric field and the magnetic field with light by employing an optical material both having a Pockels effect and a Faraday effect. CONSTITUTION:Light 1 is turned to a linear polarized light with a light detecting element 2 and to a circular polarized light through a lambda/4 wavelength plate 3. Then, as passing through a monocrystal 4 of bismuth silicon oxide, it is modulated in the phase due to a Pockels effect by an electric field 6 which is applied vertical to the monocrystaline plate 4. The light is detected with a light detector through a light detecting element 5 set at 45 deg. to the optical axis in the bearing to extract an a.c. component whereby an output proportional to the electric field is obtained. On the other hand, when the light 8 passes through the monocrystal 4 once turned into a linear polarized light with a polaroid element 9, the polarization direction of the light turns by an external magnetic field 12 due to Faraday effect. The light is detected with a photo detector through a light detecting element 11 at 45 deg. to the polaroid element 9 in the angle of bearing to extract an a.c. component. Thus, an output proportional to the magnetic field can be obtained.</p> |
