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Putting this in the beam and rotating it will produce a separation-dependent motion of sources. The tile difference is calculable. Also this leading order index perturbation, a wedge of index produces no observable differential image motion signal in our system, although it does produce common mode motion.
Feb 5 2023.
Crude calibration device:
Procured the following items from Amazon:
| Item | link | |
|---|---|---|
| 14 inch plexiglass disk 1.4 in ch thick | https://www.amazon.com/dp/B085ZQT2F8?psc=1&ref=ppx_yo2ov_dt_b_product_details |
|
| 30 rpm geared DC motor, 12V | https://www.amazon.com/dp/B071GTTX4D?psc=1&ref=ppx_yo2ov_dt_b_product_details |
|
| 12V power supply, fixed voltage | ||
| Motor mount | https://www.amazon.com/dp/B07BHDZH7Y?psc=1&ref=ppx_yo2ov_dt_b_product_details |
|
| Shaft-mount flange | https://www.amazon.com/dp/B00B887FX8?ref=ppx_yo2ov_dt_b_product_details&th=1&psc=1 |
|
Motor mount holes are M3. Flange threads are 4-40.
Placed the plexiglass disk in the oven at home at 320F, which softens it enough to bend and mould. Rolled and mushed it to introduce surface variations and index changes.
Mounted the shaft flange onto it.
Motor then turns it so variations move across the beam.
To-do:
1) improve set screw connection to shaft of motor. Set screw kit ordered.
2) drill out motor mount plate to allow mounting to a tripod, with 1/4-20 hardware.
3) test it out in lab.