This test method covers the measurement of the effective surface
roughness of an opaque
reflecting surface as determined by the total integrated light
This test method is particularly applicable to metal mirrors or
smooth dielectrics covered
with an opaque reflecting surface.
This test method is applicable to specimens ranging in size from
5 mm in diameter to as large
as the supporting components will accommodate. The sampling area is
approximately 1 mm in diameter.
Limitations - This test method is limited to specimens with
optical surfaces that are flat or
that are spherical with a radius of curvature greater than 10 m.
This test method determines the integrated scattering from an
angle approximately 2.5° from
the surface normal to an angle approximately 70° from the surface
The test method is performed with a helium-neon laser operating at
the wavelength 632.8 nm.
Repeated use of this test method on different areas of the
specimen permits mapping of the
This test method is nondestructive.
The maintenance of a control chart to monitor the stability of the
measurement process is
discussed in Annex A1.
This standard does not purport to address all of the safety
concerns, if any, associated with
its use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. For
specific hazard statements see Section 8.
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