| 摘要 |
<p>A light emitted from a light source is input to a sensor that generates an optical path difference in an input light according to the physical quantity of an object of measuring, an optical path difference-generated light output in response to the input is input to another sensor that generates an optical path difference in an input light according to the physical quantity of an object of measuring, and an optical path difference-generated light output in response to the input is branched into two to generate an interference fringe. The presence of two lights - a light having its optical path length changed at a first sensor to be input to a sensor in the next stage and transmitted without having its optical path length changed there, and a light without having its optical path length changed at a first sensor to be input to a sensor in the next stage and transmitted having its optical path length changed there - can generate an interference fringe having a fringe in a position according to the differential value of the physical quantity of an object of measuring, whereby the differential value of a physical quantity is measured by detecting this position.</p> |
