By Lionel R. Baker
This e-book provides the optical part and platforms fashion designer, and caliber coverage engineers and executives with the definitions, dimension rules, and conventional metrics used to signify top of the range specular surfaces. the writer covers either the conventional visible tools in addition to more moderen (but now not inevitably higher) computer-aided strategies and describes the metrics followed by way of the recent ISO standards, together with the surroundings of shape and end tolerances. Key problems with are raised, to assist stimulate study and improvement of recent equipment and criteria that mix the simplest of the outdated and new ways to floor assessment. Read more...
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Extra info for Metrics for high-quality specular surfaces
9 RMS asymmetry (RMSa ) This is the RMS value of the difference between the irregularity function and the approximating aspheric surface shown as (e) in Fig. 12. This parameter has optical significance in terms of the amount of radiation removed from the imaging rays. 10 Form indication on drawings Three versions of indications are possible as follows: 3/A(B/C) or 3/A(B/C) RMSt,i, or a < D or 3/--RMSt,i, or a < D, where 3 is the code number for the surface form tolerance; A is either the maximum sagitta error or (−), indicating the total radius of curvature tolerance as given in the radius of curvature dimension and not specified here; B is either the maximum permissible value of irregularity or (--), indicating no irregularity is given; C is the permissible rotationally symmetric irregularity tolerance, if given; and D is the maximum permissible value of the RMS quantity of the type specified by one of the letters t, i, or a.
Vol. 1, pp. 1–14 (1999). 7. J. Kumler and R. , pp. 104–110 (2002). 8. B. Wang and M. , pp. 62–68 (2002). 9. ISO 10110-5:1996, Optics and optical instruments—Preparation of drawings for optical elements and systems—Part 5. Surface form tolerances. 10. M. Bray, “Ensuring quality: Standards point the way to performance,” The Photonics Design and Applications Handbook, Laurin Publishing, Pittsfield, MA, pp. 395–398 (2001). 11. D. , Interferogram Analysis for Optical Testing, Marcel Dekker, New York (1998).
Since each spatial frequency component diffracts radiation at a particular angle, the method is appropriate for studying the angular distribution of radiation scattered by a surface. Microdefects with their P values may also be required. 6 Chapter Conclusions Roughness is due to random surface height variations. It is a part of texture and extends over the whole surface. 8 Surface roughness indications in drawings. pits left by the form generator. Measurement can be by deterministic (analytical) or parametric (functional) methods.