High distinguishability subnanosecond magnitude optical three-dimensional accelerometer

A high-resolution subnanomagnitude optical 3-D accelerometer is disclosed. The light source is separately connected with three fibre-optical couplers via a beam splitter; the three fibre-optical couplers are connected with the input end of the band filter via three light signal amplifiers, the three outputs of the band filter are connected with input of the digital signal processing board, the output of the digital signal processing board is connected with three inputs of the modulations of 3-D piezoelectric ceramic volume, the three mass blocks of accelerometers are separately connected with mechanical spring; three monomode fiber optics probes are mounted on the 3-D piezoelectric ceramic volume, and vertically neared to the reflection plane of reflector which is mounted on the mass blocks of accelerometers. The invention can improve the magnitude order of distinguishability of the accelerometer to above 109, the structure is simple, the accelerometers in three directions which are mutually perpendicular are integrated in one, the measuring velocity is fast, administration is real-time, the compatibility is good. It is fit for the occasion of high accuracy and high resolution.