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Absolute calibration #2
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To confirm this works: Mount camera on a translation stage. Obtain two measurements a known small distance apart (e.g. 200μm apart) and measure the phase change. Check that If all looks good, then it should be possible to use the above rig to derive a precise value for the sensor/diffuser distance. Once this is all nailed, then it should be possible to use a reference image that is associated with a known wavefront curvature. |
Not analysed carefully, but looks good so far. A good analysis would be to fit the recorded wavefronts and use that to estimate distance moved by the camera. |
Based on theoretical wavefronts we can determine distance sensor has moved to great accuracy: 9ddb5f6 |
The real differences in curvature are similar, but I've not turned these into distances from the sensor yet. |
Need to make calibration files which contain an image derived from a single-mode fibre at a known distance. We need a way of implementing that. We can then use this to get an absolute measure of wavefront.
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