Jennie Wright, Khanh Vu

This morning, July 22, we measured the input matrix of the wavefront sensors using step responses applied to the PZT and JM1. The collected data are attached below.

We turned on the offsets of the PZT and JM1 for both pitch and yaw, adjusted each offset, and measured the corresponding responses in the pitch and yaw channels of wavefront sensors A and B. For PZT yaw and pitch, we increased the offset by 400. We used smaller increments of 100 for JM1 yaw and 30 for JM1 pitch. The JM1 lock filters contained integrators and were not enabled in the actuator path, so we used the test filters to introduce the disturbances. After each measurement, we returned the offset to its original value so that the measurements were applied evenly.

The collected data matrix is attached below. The two values highlighted in red were obtained from noisy data and therefore have high uncertainty. However, both values are very close to zero.

We then calculated the inverse matrix. Because the measurements were made using different offset values, we normalized the data by first dividing each response by its corresponding offset value and then dividing all values by the largest resulting value.