Ocean Optics S1024DW Install - Manual (Page 44)

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Sampling Optics: 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. 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
Reflectance material: Spectralon
Reflectivity: >99%
Wavelength range: 200 nm - 2.5
µ
m*
Reflective area diameter: 1.25”
* With an Ocean Optics spectrometer, the use of the WS-1 is limited to 200-1100 nm.