Accelerometer based online reconstruction of fast telescope vibrations from delayed measurements
A feedforward vibration cancellation system can be used to compensate for fast wind induced telescope vibrations. Crucial is the position reconstructors ability to provide the compensation mirror with an accurate online estimate of the vibrational displacement. The authors have developed and presented a position reconstructor based on adaptive resonators. However, network data transmission of the acceleration signals introduces a time delay into the measurement chain. Any feedforward compensation setup can only function well if a delay free estimate of the disturbance signal is provided. Three delay compensating extensions of the developed position reconstructor are presented and analyzed.
Astronomical Telescopes Instrumentation