The VW SRA is designed to measure the direct (specular) reflectance of light from smooth solid materials at near normal incidence. The term “VW” describes the light path through the accessory in the reference and measurement positions. The VW design features a kinematically mounted spherical mirror, which is used for both calibration and sample measurement. With the exception of the sample, the same optical elements are always in the light path, providing a truly absolute reflectance measurement. Absolute measurements remove any need to correct results against standard reference materials. The VW optical design also provides the functionality necessary for: • Real time comparison of coated and uncoated substrates • Reflectance, transmittance and absorptance measurements without touching the sample • Transmittance determination on highly transparent films using a double pass through the sample when in the “V” measurement position • Single bounce reflectance measurement configuration for extreme AR coatings (< 0.1 %R) AGILENT VW ABSOLUTE SPECULAR REFLECTANCE ACCESSORY FOR THE CARY 100/300/4000/5000/6000i UV-VIS-NIR SPECTROPHOTOMETERS Obtain high precision absolute specular reflectance measurements Optical diagram of the dual view Cary VW SRA accessory for the Cary 4000/5000/6000i 1. Incident light 2. Movable spherical mirror 3. Sample For more information: www.agilent.com/chem/uv 2 1 3 3 2 1 ect (specu ul la ar r) ) CU U U ULAR 0/5 5000/600 M ETERS ar reflectance measurements 00 i
2
Embed
AGILENT VW ABSOLUTE SPECULAR CULAR REFLECTANCE ACCESSORY … · 2016-10-04 · accessory in the reference and measurement positions. The VW design features a kinematically mounted
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
The VW SRA is designed to measure the direct (specular)
refl ectance of light from smooth solid materials at near normal
incidence. The term “VW” describes the light path through the
accessory in the reference and measurement positions. The VW
design features a kinematically mounted spherical mirror, which
is used for both calibration and sample measurement. With the
exception of the sample, the same optical elements are always in
the light path, providing a truly absolute refl ectance measurement.
Absolute measurements remove any need to correct results against
standard reference materials.
The VW optical design also provides the functionality necessary for:
• Real time comparison of coated and uncoated substrates• Refl ectance, transmittance and absorptance measurements without
touching the sample• Transmittance determination on highly transparent fi lms using a double
pass through the sample when in the “V” measurement position• Single bounce refl ectance measurement confi guration for extreme AR
ApplicationsThe VW SRA is ideal for the analysis of high or low refl ectance materials, and is also suitable for transmittance and absorptance measurements. It can be used for the characterization of laser mirrors, refractive index determinations, fi lm/coating thickness measurement and calculation of optical constants.
The accessory features a ‘VW’ confi guration, with one spherical mirror, and two toroidal mirrors. The movable mounting of the spherical mirror allows it to be used for both calibration and sample measurement ensuring the same optical components are in the light path during both calibration and measurement. When a sample is mounted, the only change in the system is due to the refl ectivity of the sample. An absolute value of the refl ectance is easily obtained.
Sample Example measurementThin fi lms Transmittance, refl ectance,