NAOJ GW Elog Logbook 3.2
According to the actuation calibration in elog1877, the driving of 5urad can be represented in the unit of counts.
The excitation is therefore decided to be the following table (at 2Hz).
| Input Yaw excitation | Input Pitch excitation | End Yaw excitation | End Pitch Excitation |
| 227 | 793 | 186 | 961 |
According to this excitation, the response (sensing matrix) is as the following table
| WFS1_p | WFS1_y | WFS2_p | WFS2_y | |
| Input_y_exc | 48 | 470 | 36 | 248 |
| Input_p_exc | 275 | 70 | 180 | 33 |
| End _y_exc | 66 | 180 | 73 | 161 |
| End_p_exc | 269 | 143 | 292 | 74 |
The offset of these signals is listed as the following table
| WFS1_p | WFS1_y | WFS2_p | WFS2_y | |
| offset | 31 | 20 | 29 | 13 |
Then subtracting the offset from the sensing matrix. The sensing matrix (after substracting) is used to decide the driving matrix index magnitude. The principle is that if the response is larger, the driving needs to be also larger. Without considering the coupling between pitch and yaw, the driving matrix is decided to be
| WFS1 | WFS2 | |
| input_p | 1.6 | -1 |
| end_p | 0.9 | 1 |
| input_y | -1.9 | 1 |
| end_y | -1.1 | 1 |
The sign of the above driving matrix is decided by the time-series measurement yesterday.