| 摘要 |
<p>According to the instant invention, two input light transmitting lines or paths are used which transmit the wavelength input light of the same wavelength. A detecting portion modulates the two inputs according to the physical quantity to be measured and produces separate outputs along two output transmitting paths. A processing portion processes the two outputs and calculates the physical quantity to be measured. In the detecting portion, each of the inputs is split into two separate light signals each of which varies at a different rate due to the effects of the physical quantity. The two separated light signals follow a respective output transmitting paths. As a result, two output signals are produced along the output paths for each input light applied to the detecting portion. The processing portion calculates one intensity ratio corresponding to the ratio of the two output signals when one input light is supplied, and calculates another intensity ratio corresponding to the ratio of two output signals when the other input light is supplied. These intensity ratios are multiplied and the physical quantity is then calculated based on the resulting multiplied value.</p> |
