Phantom Image Captures
Table of Contents
Phantom Image Captures: Zoom Extreme Experiment
May 7th, 2009
Using the prototype system, phantom images were captured at the zoom extremes of the system as a means to test the range of spatial frequencies which can be generated by the prototype using the Computar lens.
Four different configurations were tested as the image distance and the zoom of the lens was adjusted. The lens can be finely zoomed between 'near' and 'far', and it was set between the maximum near setting and the maximum far setting for this experiment. The configurations used are summarized in the table below.
|Configuration||Lens Setting||Image Distance|
Constants for the experiment include:
- Projection angle was ~30 degrees down from the platen, the steepest the system can provide
- #96 Lime Green sheets were used
- The phantom block remained stationary on the platen
- A blue excitation filter and a green emission filter were used
- Grid voltages (per fine calibration 050609) of 20, 48.45, and 74.22 were used for phase shifting
- Protection optics were unshielded during testing
- The Computar C lens was used
- 40 pixels per mm zoom
- Camera Settings (see below)
Optigrid Warm Up Routine
The Optigrid was warmed up per the routine used in previous experimentation and documented in the Calibration Routine Document v2.
We were able to achieve spatial frequencies of 1.06 lines/mm in the MAX NEAR - SHORTEST configuration and 0.8 lines per mm in the MAX FAR - NOT CLOSE configuration. Downloadable Images in raw TIF format can be found below.
MAX NEAR - SHORTEST
MAX FAR - SHORTEST
MAX NEAR - LONGEST
MAX FAR - LONGEST