| 摘要 |
<p>PURPOSE:To measure electricity quantity independently of variation in transmission loss and connection loss of optical fiber by employing an analyzer that analyzers first light that passes a light modulation element but does not analyze the second light and has characteristic of dependance on the wave length of light. CONSTITUTION:Lights 23 and 24 with different wave lengths and made one body by means of a light integrating device 25 are sent to light modulation section 27 via a light transmission section 26, and is subjected to straight polarization by a polarizer 29, and then gets into a Pockel's crystal 32. Then the light that is emitted with the phase difference between intrinsic polarizations in accordance with the voltage between electrodes 30 and 31 is transmitted to an analyzer 43 and the light is analyzed and the light 24 is not analyzed. The light 24 is sent out as it is. After lights 23 and 24 are separated by a light separator 36 through a light transmitting section 35, each of them is detected independently, and displayed at a display device 42 for the ratio of output light strength that is calculated at an arithmetric unit 41. With this arrangement high precision measurement can be carried out without lowering sensitivity even if wave lengths of the first and second lights are made close.</p> |
