A novel simultaneous sampling technique and its application to multipoint optical fibre sensor accelerometers

摘要

Monitoring large hydroelectric rotating machines requires a multichannel system. Simultaneous sampling of several input channels is needed to avoid the propagation of initial measurement errors. However, this is usually not guaranteed by the acquisition hardware, due to the additional expense involved. The alternative is to correct the error caused by non-simultaneous sampling using digital signal processing techniques. A novel method for real-time, software-based simultaneous sampling using low-order Lagrange interpolation filters is presented. This technique has been implemented in the optoelectronic unit of an optical multipoint accelerometer.