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Size: 1189
Comment:
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Size: 1398
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 11: | Line 11: |
| The yoke should be set so that the double and single LVDT coils are symmetrically aligned when the keystone is at nominal height. It is convenient to set this in terms of the amount the PEEK coil former sticks out above the filter baseplate: | The yoke should be set so that the double and single LVDT coils are symmetrically aligned when the keystone is at nominal height. It is convenient to set this in terms of the amount the PEEK coil former sticks out above the filter baseplate. === Bottom Filter (BS and SRx) === Note that the CAD is wrong for the bottom filter yoke: |
| Line 15: | Line 19: |
| === Standard Filter (BS and SRx) === {{attachment:YokeHeightExampleSF.png| |width=400}} === Summary === |
KAGRA VIS Operations Manual - LVDT
LVDTs are used for vertical sensing and actuation in all the GAS filters and for horizontal sensing and actuation in all the IP stages.
See LVDT Signal Conditioning for useful background on LVDT demodulation.
See JGW-T1201255 for description of the Nikhef-supplied cards, and JGW-T1604798 for more information on how to tune the demodulation circuit.
Summary of LVDTs Calibration Procedure(JGW-E1707287). Here: LVDT Calibration Procedure.
Yoke Height Settings
The yoke should be set so that the double and single LVDT coils are symmetrically aligned when the keystone is at nominal height. It is convenient to set this in terms of the amount the PEEK coil former sticks out above the filter baseplate.
Bottom Filter (BS and SRx)
Note that the CAD is wrong for the bottom filter yoke:
Standard Filter (BS and SRx)
Summary
GAS Filter |
Yoke Height |
Keystone Height |
SR BF |
3.5 mm |
65.5 mm |