Intensity modulation type optical sensor and optical current / voltage sensor

摘要: An influence on a sensor output is suppressed to minimum degree even in the case when there ripple light source, thereby improving measurement accuracy. In an intensity modulation type optical sensor, from source 1 guided head 6, of modulated basis alternating current (AC) measured object (for example, i) changing with time, received receiving element 81 and converted into electrical signal, normalized signal Xs indicating acquired ratio AC component As DC Ds acquiring value object. Further this invention, reference Vr by separating part incident Xr Ar Dr subtracted Xs, reducing noises