[Izumi, Sugimoto]
Super late report.
3/1 work.
We calibrated the IQ demodulators for RFPDs and RFQPDs on the REFL table.
If we asuume that demodulat the waves of frequency f +f' by I-phase and Q-phase of frequency f respectively, we should be obtain the waves of the same amplitude with a phase shifted by 90 degrees at frequency f'.
However, if f is RF, it is not necessarily.
Therefore, we carried out calibration.
We set f ' to 100 Hz.
The blank part is the part I forgot to take the data.
| Name | The gain befor calibration (The rate of Q/I) | The phase sift befor calibration [degrees] | The gain after calibration (The rate of Q/I) | The phase sift after calibration [degrees] | peak to peak voltage after calibration [V] |
| LSC-REFL-PDA1-RF17 | 1.05429 | -90.7219 | 0.995342 | -90.0145 | 3.50 |
| LSC-REFL-PDA2-RF51 | 0.991335 | -89.5919 | 1.00026 | -89.9793 | 2.10 |
| LSC-REFL-PDA2-RF135 | 0.73891 | -87.680 | 1.0015 | -90.0707 | |
| LSC-REFL-PDA1-RF45 | 1.00127 | -88.1976 | 0.999906 | -90.0016 | 3.50 |
| ASC-REFL-QPDA1-RF17 ch1 | 1.01807 | -89.6369 | 1.00018 | -89.9992 | 3.38 |
| ASC-REFL-QPDA1-RF17 ch2 | 0.979708 | -89.1382 | 0.999969 | -90.0025 | 3.44 |
| ASC-REFL-QPDA1-RF17 ch3 | 0.98467 | -89.481 | 1 | -89.9978 | 3.40 |
| ASC-REFL-QPDA1-RF17 ch4 | 1.03072 | -88.5935 | 1.00005 | -90.0008 | 3.38 |
| ASC-REFL-QPDA2-RF17 ch1 | 0.96561 | -89.4847 | 1.00002 | -89.9991 | 3.18 |
| ASC-REFL-QPDA2-RF17 ch2 | 0.967119 | -88.8967 | 1.00003 | -90 | 3.26 |
| ASC-REFL-QPDA2-RF17 ch3 | 0.944296 | -89.919 | 0.999972 | -90.0013 | 3.16 |
| ASC-REFL-QPDA2-RF17 ch4 | 0.975703 | -89.3181 | 0.999971 | 90 | 3.24 |
| ASC-REFL-QPDA1-RF45 ch1 | 1.02017 | -89.313 | 1.00001 | -90.0022 | 3.36 |
| ASC-REFL-QPDA1-RF45 ch2 | 1.01029 | -89.7181 | 1.00003 | -89.9978 | 3.30 |
| ASC-REFL-QPDA1-RF45 ch3 | 1.02415 | -90.6757 | 1.00001 | -89.9986 | 3.36 |
| ASC-REFL-QPDA1-RF45 ch4 | 1.01039 | -88.6579 | 0.999954 | -89.9981 | 3.32 |
| ASC-REFL-QPDA2-RF45 ch1 | 1.00845 | -89.4568 | 0.99997 | -90.0046 | 3.26 |
| ASC-REFL-QPDA2-RF45 ch2 | 1.01756 | -89.8436 | 1.00004 | -90.0047 | |
| ASC-REFL-QPDA2-RF45 ch3 | 1.01361 | -89.6703 | 1.00005 | -89.9988 | |
| ASC-REFL-QPDA2-RF45 ch4 | 1.02317 | -90.3244 | 0.9999 | -90.0025 |
However, if f is high, it is not necessarily.
Therefore, we carried out calibration.
If we asuume that demodulat the waves of frequency f +f' by I-phase and Q-phase of frequency f respectively, we should be obtain the waves of the same amplitude with a phase shifted by 90 degrees at frequency f'.
However, if f is high, it is not necessarily.
Therefore, we carried out calibration.
