Ocean Optics Specular Reflectance Standards User Manual

Specular Reflectance Standards

Operating Instructions

Ocean Optics offers three specular reflectance standards for use as references when measuring the
reflection of surfaces with high or low specular reflectivity:

 STAN-SSH: Used to measure high-reflectance surfaces of optical substrates and coatings,

machined metals and semiconductor materials. Values are calculated for any angle from 0 to 45º.

 STAN-SSH-NIST: This is a calibrated version of the STAN-SSH. Values are calibrated at a 6º

angle traceable to NIST and are included with the standard in a calibration file on CD. A periodic
recalibration is recommended. Check with Ocean Optics for recalibration services and costs.

 STAN-SSL: This is a low-reflectance specular reflectance standard.

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 STAN-SSH.

If you are using the STAN-SSH-NIST, load the CD that came with your reflectance standard and store the
calibration files to a location that you will browse to later.

Operating Using OOIBase32 Software

► Procedure

1. Make sure you are in Scope mode, by either clicking the Scope Mode icon on the toolbar, or
selecting
the light path going to your reference. Place the reflection probe over the reflection standard.
Keep the reflection probe at an angle between 0 and 45

2. Click the Store Reference spectrum icon on the toolbar or select Spectrum | Store Reference

from the menu bar to store the reference. This command merely stores a reference spectrum in
memory. You must select
spectrum to disk.

STAN-00000-000-01-201106 1

View | Scope Mode. Take a reference spectrum by first making sure nothing is blocking

.

File | Save | Reference from the menu bar to permanently save the

Specular Reflectance Standards Operation Instructions

3. Block the light path to the spectrometer. Then, take a dark spectrum by clicking the Store Dark
Spectrum

command merely stores a dark spectrum in memory. You must select

icon on the toolbar or by selecting Spectrum | Store Dark from the menu bar. This

File | Save | Dark from the

menu to permanently save the spectrum to disk.

You must take a dark spectrum before measuring transmission.

4. Put the sample is in place and ensure that the light path is clear. Then, take a reflection
measurement by clicking on the

Transmission Mode

from the menu bar (since the mathematical calculations used to calculate
transmission and reflection are identical). To save the spectrum to disk, click the
toolbar or select

File | Save | Processed from the menu bar.

Transmission Mode icon on the toolbar or selecting Spectrum |

Save icon on the

Operating Using SpectraSuite Software

► Procedure

1. Place SpectraSuite in Scope mode by clicking the Scope ( ) icon in the Experiment mode
toolbar or selecting

2. Ensure that the entire signal is on scale. The intensity of the reference signal’s peak differs
depending on the device being used. If necessary, adjust the integration time until the intensity is
appropriate for your device. Ensure that the entire signal is on scale.

Processing | Processing Mode | Scope from the menu.

3. Select

File | New | Reflection Measurement. Use the Reflection Measurement wizard to take a
reference spectrum (with the reference standard) and a dark spectrum. You must take a reference
and a dark spectrum before measuring reflection.

4. Put the sample in place and ensure that the light path is clear. Then, take a reflection
measurement.

5. If you received calibration file with your reference standard, click the Non-unity Correction icon

) on the toolbar. The Select Reference File screen appears.

(

6. Browse to the location where you stored your reflectivity standard files. Then click the
button.

The reference information appears on the

Select Reference File screen.

Specifications

Specification STAN-SSH STAN-SSH-NIST STAN-SSL

Substrate dimensions 31.75 mm outer diameter x 6.35 mm height

Housing dimensions 38 mm outer diameter x 19 mm height

Weight 40 g

Reflectance material Front surface-protected

aluminum mirror on fused
silica substrate

Front surface-protected
aluminum mirror on
fused silica substrate

Schott ND9 glass

Apply

Reflectivity

2 STAN-00000-000-01-201106

200 – 1000 nm: ~87 – 93%

1000 – 2050 nm: ~93 – 98%

200 – 950 nm: ~5%

950 – 2500 nm: ~4%