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Old 2nd March 2011
  #30
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johndykstra's Avatar
 

From what I can gather by visual and deductive (roughly 2' period, N13 with equal slat to slot ratio), It would seem the slat faces of the "air transparent" combo amplitude/phase gratings are approx 1". Would this imply that the diffusive return of such a device would only be composed of roughly 8k and up?
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