Hi Barry -- It isn't an integrator since the piezo device is a capacitor. The combination of the capacitive input and capacitive feedback make it flat with frequency (above the cutoff of the resistor and C1). Below this cutoff, it's actually a derivative function. Looking at a couple of articles about piezoelectricity, it appears it is a change in electric polarization with change in applied stress. On the surface, I think this would imply it is an acceleration device. Is there more to the story? Karl At 07:59 PM 1/30/2000 -0800, you wrote: >Karl > It sounds suspiciously like an integrator. If this is the case then maybe >the output of the short period piezo sensor would be acceleration. I'll have to >pull the sensor out of the dust and see if it will work again. >Regards >Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>