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Decoating Optical Components
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Decoating Optical Components (cont) - TM-9-254_289
TM 9-254 9-9. Coating Optical Components - Continued NOTE Coating  is  a  thin  film  of  magnesium  fluoride  applied  to  the  surface  of  optical  elements  at  a thickness of one-quarter wavelength of light (550 to 600 millimicrons). b. Identifying Coated Optics.  To identify coated optical elements, hold the element at an angle to a light source. Observe  the  reflection  of  the  light  source  on  the  surface  of  the  lens.    The  reflection  of  the  light  will  have  a  purplish  or bluish-purple tint if the element is coated properly. c. Preparation for Coating.  The procedure for cleaning optical elements is as follows: (1) Mix a solution of 1/2 teaspoon of Duponol Me Dry and 1 quart  of  luke-warm  water  in  a  stainless  steel tray.  Place a pad of cheesecloth in the bottom of the tray to protect element surfaces. (2) Carefully place lens elements in the tray and allow to soak from 1 to 2 minutes.  Then wash each lens element with a piece of cheesecloth in the cleaning solution. (3) Remove  one  element  at  a  time  and  dry  the  element  with  a  piece  of  cheesecloth  (fig.  9-28).    Inspect element for foreign matter such as dirt and lint.  If the element is not clean repeat steps (1) through (3) above. (4) Place clean lens elements on holding fixture as described in paragraph d. Figure 9-28.  Proper Method of Holding a Lens d. Holding  Fixture  Setup  (fig.  9-29).    The  holding  fixture  is  designed  with  adjustable  rails  to  hold  any  size  or shape of optical element.  The procedure for setting up the fixture is as follows: Change 2  9-26

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