Ocean Optics RSS-VA User Manual
RSS-VA
Variable-angle Reflection
Sampling System
Installation and Operation Instructions
Description
The RSS-VA Variable-angle Reflection System is an optomechanical device that couples to
spectrometers and light sources to measure the specular reflection of optical substrates from 2001100 nm, at varying angles of incidence.
The RSS-VA features two SMA 905 Connectors – one to illuminate the sample and one to collect the
reflected light and transfer it to the spectrometer. It also features a 3-point surface mount that holds the
sample to be measured in a fixed position during the integration period.
Inside the black anodized chamber, the RSS-VA features optics mounted on a carrier that you can
manually adjust to set the angle of incidence from approximately 10
thumbscrew holds the optical assembly at the fixed angle.
When used with Ocean Optics spectroscopic systems and specular reflectance standards, the RSS-VA
is a versatile variable-angle device for characterizing a variety of optical substrates, such as those
featuring metallic and dielectric coatings.
° to 50°. Once adjusted, a
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RSS-VA Installation and Operation Instructions
How the RSS-VA Works
The RSS-VA features a unique internal design that enables it to obtain sample measurements at
varying Angles Of Incidence (AOI). The RSS-VA works as follows:
Light enters the RSS-VA via the SMA 905 input connector (1).
1. Light is reflected up onto the sample port (2) at the degree determined by the AOI setting on
the RSS-VA, where it interacts with the sample.
2. Sampled light is reflected back down through the RSS-VA.
3. Light exits the RSS-VA via the SMA 905 exit connector (3).
Assembling the Hardware
You must first configure your sampling hardware and the RSS-VA prior to measuring your sample.
► Procedure
Follow the steps below to set up the RSS-VA:
1. Connect a fiber from the light source to the SMA 905 input connector of the RSS-VA.
2. Connect a fiber from the SMA 905 output connector of the RSS-VA to the spectrometer.
3. Place a STAN-SSH standard on the sample port.
4. Start your spectrometer operating software. Once data acquisition begins, a typical bellshaped curve should be displayed in the graph area.
5. Adjust the position of the slide carrier on the RSS-VA until the pointer on the RSS-VA is at
the desired AOI.
6. Adjust the integration time in the software until the signal peaks at approximately 3500
counts.
You have now properly configured the RSS-VA hardware.
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