A novel phase modulation accelerometer based on self-mixing effect is presented. A quartz pendulous reed suspended by dual flexible beam is used as the first step sensing unit, which translates the acceleration signal to the displacement of quartz pendulous reed. The laser self-mixing interferometer reads out the displacement of quartz pendulous reed while the sensor experience acceleration. All-phase spectrum analysis is applied to detect the phase of self-mixing interference signals to reconstruct the acceleration. Finally, performances of the novel phase modulation accelerometer are measured by experiments. Experimental results indicate that the resolution of the acceleration sensor based on laser self-mixing interference can achieve sub micro-g. The phase modulation accelerometer has the potential to achieve high-precision, compact accelerometers.

To solve the coupling problems cause by flexible structure of Dynamic Tuned Gyroscope (DTG), solutions was proposed through the combination of loop control and decoupling within Individual Channel Design (ICD) framework during the DTG lock loop design. Firstly, theoretical model of DTG and its actual coupling property were presented. Then, the diagonal controller was designed for the diagonal elements and counter-diagonal elements of DTG transfer function matrix under the framework of ICD. The stability and coupling relationship of individual channel were also analyzed for both two cases. Finally, a validation experiment was carried out for a certain type of DTG when it works in tuned state and mistuned state with 20% perturbation of tuned speed. The experimental results show that the diagonal controller for both two cases can stabilize the loop. But in mistuned state, the coupling degree of diagonal elements case grows up to 15%.This shows that the controller robustness for counter-diagonal elements is greater.