科研之友
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摘要
In space science exploration, the electrostatic suspension accelerometer is usually used for non-conservative force measurement focusing on low-frequency quasi-steady-state microgravity signal, but it has a large volume and high cost. Quartz flexible accelerometer with small volume and mature technology can be used for microgravity signal measurement. However, insufficient suppression of high-frequency noise will lead to spectrum aliasing and influence the low-frequency measurement accuracy of microgravity. The high-precision quartz flexible accelerometer is transformed into a microgravity acceleration measurement system with a small range and high precision. The key parameters of the system are noise suppression and anti-aliasing performance. Through circuit modeling and simulation, the influence of spectrum aliasing on low-frequency microgravity measurement is demonstrated, and the effectiveness of the anti-aliasing filter and over-sampling technique is verified. The experiential results show that the low-frequency noise level of the acceleration measurement system can reach 10-7 g/(Formula presented), the resolution can reach (Formula presented) and the lowest frequency can reach 0.001 Hz, which shows the accuracy potential of the quartz flexible accelerometer for microgravity measurement.
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