Specular Reflectance is a technique for analyzing
transparent films which usually yield weak spectra by
ordinary transmission techniques. Applications include
surface coatings on reflecting substrates; film thickness
measurements by interference fringes and reflectivity
coefficient determinations of metals. The application is
the determining factor when deciding which angle of
incidence should be selected. A 30 degree angle of
incidence is normally chosen for more routine samples which
have coating thicknesses in the micrometer range. For very
thin coatings in the nanometer thickness range, an 80 degree
angle of incidence would be appropriate. When sample
thickness is unknown, the full range of specular reflectance
analysis can be performed conveniently with the VeeMax II,
Variable Angle 30 - 85 degree accessory. Simply move the
sliding lever on the graduated scale to the desired angle.
Each accessory provides a reference mirror to permit the
operator to acquire a background spectrum. Their designs
eliminate stray light and ensure minimum energy loss.
Sensitivity can be further enhanced with the use of a wire
The order details provide for an 80 degree Specular
Reflectance accessory only. The 30 degree and Variable
Angle Specular accessories remain as options and
can be ordered separately.