电子信息工程外文资料翻译---压电式加速度传感器及其应用-电子信息(编辑修改稿)

电子信息工程外文资料翻译---压电式加速度传感器及其应用-电子信息(编辑修改稿)内容摘要：

erometer output voltage (mV) and are under the acceleration than。 The latter is accelerometer output charge and are under the ratio of acceleration. Acceleration unit for m/s2, but in vibration measurement often use standard gravity acceleration of units, 1 g g = m/s2. This is a kind of already accepted means, almost all vibration measurement instrument with g acceleration and in the instrument as a unit of the board face and manual drawings. For given for piezoelectric materials, with the increase of the quality of the sensitivity of the increase of piezoelectric element or increase. Generally, the greater the size of accelerometer, its inherent frequency is lower. So choose acceleration time should weigh sensitivity and structure size and the influence on the quality of additional and frequency response characteristics of the advantages and disadvantages between. Piezoelectric crystal accelerometer transverse sensitivity says it lateral (in vertical axis) accelerometer sensitive degree of transverse vibration, the sensitivity to the Lord sensitivity (that is often accelerometer voltage sensitivity or charge sensitivity) percentage said. In general on the shell marked by a red dot minimum horizontal direction, a good and the sensitivity of the accelerometer transverse sensitivity should be less than 3% of the Lord sensitivity. Therefore, the piezoelectric accelerometer test in the direction of the obvious. Five, the piezoelectric acceleration sensor error formation factors analysis Piezoelectric accelerometer preamplifier piezoelectric element stress the creation of charge after amount, this very weak charges boundary and then piezoelectric element on the boundary conductor charged to the voltage U = q/Ca (here is the accelerometer Ca in capacitance). To determine the charge so weak (or voltage) is the key to prevent wire, the measurement circuit and accelerometer itself of charge of the leakage. In other words, piezoelectric accelerometer used the preamplifier should have extremely high input impedance, the leakage reduced to the measurement accuracy required within the limits of the piezoelectric sensors, the preamplifier: voltage amplifier and charge amplifier. The voltage amplifier is high input impedance amplifier is the proportion of. The circuit is simple, but by connecting cables of output capacitance effects, used in general vibration measurement. A charge amplifier to be negative feedback, use of capacitance basic from the influence of the cable capacitance. In charge amplifier, usually with high quality yuan, devices, high input impedance, but the price is more expensive. From the piezoelectric sensor mechanics model of the look, it is low pass characteristics, the original extremely low frequency vibration measurement. But in fact because of low frequency especially small amplitude vibration acceleration, the sensitivity of the s。