cheryl.vorvick@LIGO.ORG - posted 13:25, Friday 09 September 2016 - last comment - 07:36, Monday 12 September 2016(29571)
consistancy of pitch and yaw qpd signals downstream of the IMC - a second look
After finding that the ISS 2nd loop pitch and yaw signals are swapped, and inverted wrt im4 trans (my first look at qpds downstream of the IMC, alog 29542), I've looked at four qpds downstream of the IMC for signal consistancy - IM4 Trans, ISS 2nd Loop, POPA, and POPB.
What I found:
- plot 1: im4 trans yaw, iss2 pitch (inverted), popa yaw, and popb yaw - consistant
- plot 2: im4 trans pitch (doubled), iss2 yaw (inverted), popa pitch (inverted), and popb pitch - first 3 consistant, popb pitch is not a good match
- plot3: im4 trans pitch (doubled), iss2 yaw (inverted), popa pitch (inverted), and popb pitch (inverted) - first 3 consistant, popb pitch (inverted) is closer, but still not a good match
- plot4: im4 trans yaw, iss2 pitch (inverted), popa yaw, popb yaw, and popb pitch - popb pitch is a pretty good fit for yaw
Images attached to this report
Comments related to this report
chart showing the current orientations:
| pitch | yaw | |
| IM4 Trans | 1 | 1 |
| ISS 2nd loop | -yaw | -pitch |
| POPA | -1 | 1 |
| POPB | ? | 1 |