MEMS piezoresistive sensor based design of low-power consuming and high-overloaded testing system
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摘要: 为了检验弹体在高冲击环境下的工作情况，提出了一种基于压阻传感器的高过载、低功耗的测试系统设计方案。该系统可承受2×105g的过载冲击测试，且具有采样率高、体积小、功耗低的特点。通过打靶实验验证：在过载测试过程中该系统具有承受高冲击的能力，并能精确地采集到信号微弱变化，保证了弹体在飞行中记录数据的准确性。Abstract: To investigate the working conditions of a missile in a high-impact environment, this paper presents a design scheme for low-power consuming and high-overload testing system based on an MEMS apiezoresistive sensor. The system is capable of withstanding tests with a 2×105g overloaded impact and possesses such characteristics as a high sampling rate, a small volume, and a low-power consumption. As validated by our targeting experiments, the system was able not only to withstand a high overloaded impact but also to accurately capture the slight variations of a weak signal, which ensures the accuracy of the data recorded by the missile in flight.
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图 3 压阻式微加速度计结构受力模型
Figure 3. Structural force model of piezoresistive micro accelerometer
图 4 加速度计应力应变ANSYS模拟图
Figure 4. ANSYS simulation diagram of accelerometer stress and strain
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