| 摘要 |
PROBLEM TO BE SOLVED: To effectively suppress a measurement error by notching out all feedback torque in a lump with the driven frequency. SOLUTION: An acceleration input signals is inputted to a sensor 34, and a sensor output signal is inputted to a demodulator 36. The demodulator 36 demodulates the sensor output signal with the signal cos (wDt), where wD is the driving frequency, and (t) is time. The output signal of the demodulator 36 is inputted to a servo compensator 38, the servo compensator 38 generates the measured acceleration signal, and the measured acceleration signal is inputted to a feedback loop 40. The feedback loop 40 includes a torque remodulator 42 modulating the signal with cos(wDt). The output signal is inputted to the sensor 34 to complete the feedback loop 40. Demodulation occurs inside the feedback loop 40. This system is operated when all relative motion of the standard mass of the sensor 34 is completely suppressed from Coriolis acceleration and the necessary torque is measured. |
