Introduction to Piezoelectric Pressure Sensors（介绍压电式压力传感器）.pdfVIP

Introduction to Piezoelectric Pressure Sensors LIVM PRESSURE SENSORS As with all LIVM instruments, the voltage generated by the crystals is fed to the gate terminal of the FET input stage of an impedance converting IC amplifier Dynamic pressure sensors are designed to measure pressure changes in liquids which drops the impedance level 10 orders of magnitude. This allows these and gasses such as in shock tube studies, in-cylinder pressure measurements, instruments to drive long cables with little effect on frequency response. field blast tests, pressure pump perturbations, and in other pneumatic and hydraulic processes. Their high rigidity and small size give them excellent high Referring to figure 1a and 1b, series 2300V contains an integral accelerometer frequency response with accompanying rapid rise time capability. Acceleration built into the crystal stack. This accelerometer, consisting of one quartz crystal compensation makes them virtually unresponsive to mechanical motion, i.e., and a seismic mass, produces a signal of opposite polarity (to that produced by shock and vibration. pressure on the diaphragm) when acted upon by vibration or shock. This sig- nal cancels the signal produced by vibration or shock acting upon the Figures 1a and 1b are representative cross sections of Dytran Model Series diaphragm and end piece, negating the effects of mechanical motion on the 2300V LIVM (Low Impedance Voltage Mod