Ocean Optics S2000 - Manual (Page 80)

WS-1 Diffuse Reflectance Standard
The WS-1 D IFFUSE R EFLECTANCE S TANDARD is a compact physical standard for use in performing diffuse
reflectance measurements, especially color analysis. The reflectance material that comprises the WS-1 is
Spectralon, a highly lambertian thermoplastic substance that provides a nearly 100% diffuse reflective surface for
applications from 200 nm to 2.5
µ m. (With an Ocean Optics spectrometer, the practical use of the WS-1 is limited
to 200-1100 nm.) The reflective area of the WS-1 is 1.25" in diameter. The diffusing material is encased in a small,
black receptacle with a screw-on top.
Operation
Reflection is the return of radiation by a surface, without change in wavelength. Reflection is expressed as a
percentage relative to the reflection from a standard substance, such as the WS-1 white reference material. The
WS-1 is mostly used in a setup with a reflection probe and reflection probe holder for diffuse reflection
measurements or with the ISP-REF Integrating Sphere. To use the WS-1 as a reference in a diffuse reflection
measurement:
1.
Make sure you are in Scope Mode, by either clicking the Scope Mode icon on the toolbar, or selecting View |
Scope Mode. Take a reference spectrum by first making sure nothing is blocking the light path going to your
reference. Place the reflection probe over the WS-1. For best results, use our Reflection Probe Holder to keep
the reflection probe firmly at a 45
°
angle.
2. Take the reference reading by clicking the Store Reference Spectrum icon on the toolbar or selecting File |
Store Reference Spectrum.
Specifications
Sampling Optics: WS-1
- 80 -
Reflectance material: Spectralon
Reflectivity: >99%
Wavelength range: 200 nm - 2.5
µ
m*
Reflective area diameter: 1.25"
* Though the product can be used to 2.5
µ
m, it can be configured to "see" only to 1100 nm with our S2000
spectrometer.