Diffuse Reflectance Spectroscopy Instruments for Measuring Virtually Any Sample
Gamma Scientific provides unique, high-performance solutions for reflectance and transmission testing. These reflectivity measurement devices and light transmission testing systems capture complete spectral and colorimetric properties of thin film coatings with scan times typically less than one second. Uniquely, the 191F Specular Reflectometer can non-destructively measure first-surface reflectance on transparent substrates up to 0.3mm thick, with 100% exclusion of backside reflectance and no backside preparation or additional interference. Second-surface or second layer intermediate reflectance can also be characterized on intermediate surfaces by excluding reflectance from other surfaces within the substrate.
Our diffuse reflectance spectroscopy instruments are available in several configurations, optimized for the sample type and desired measurement result, including either polished (specular) or rough (diffuse) samples. The below product selection guide will help you configure the best system to fit your needs.
Applications
- Anti-reflectance coating characterization
- Flat-panel display glass testing
- Touchscreen display glass testing
- Optical filter / lens testing
- Pyrolytic glass coating test & characterization
- Characterization of flat panel displays, photovoltaic coatings, low-E architectural coatings, paint samples and diffuse plastics
The vast majority of our Display Measurement Solutions are custom-configured.
Installation and commissioning is option, though for the automated systems, highly recommended.
191F Series models are available in handheld, tabletop, semi-automatic and fully automatic configurations.
191F Series models have a fixed AOI as indicated above. A handheld unit with 10-45º variable AOI is available under model number 191C.
191 T and 191 DR Series units are available in tabletop models only.
191 Series Optical Heads Specification Comparison Table | ||||
---|---|---|---|---|
191 Series Optical Heads | 191F | 191T | 191C | 191DR |
Measurement Type | Specular Reflection or Total Reflection | Total Transmission | Specular Reflection | Diffuse Reflection |
Sample Types | Glass, Plastic, Metal, Polished Substrates | Glass, Plastic, Transmissive Elements | Glass, Plastic, Metal, Polished Substrates | Opaque Materials, Matte Surfaces, Rough Substrates |
Illumination Angle | Fixed Angle at 0°, 10°, 20°, or 45° or Dual Angle 10° & 45° | 0° | 10° to 45° Variable | 45° |
Viewing Angle | Matches Selected Illumination Angle | 2π (180°) | 10° to 45° Variable | 45° |
System Configuration | Handheld, Tabletop, Semi-Automatic, Fully Automated | Tabletop | Handheld | Tabletop (Sphere Based) |
Minimum Sample Thickness | Dependent on Angle (transparent samples) | None (transparent samples) | 1.5mm (transparent samples) None (opaque samples) | None (opaque samples) |
Spectral Range | 365nm-900nm (default) UV / IR Options Available | 365nm-900nm (default) UV / IR Options Available | 365nm-900nm | 365nm-900nm UV / IR Options Available |
Illumination Spot Size (Area of Analyis) | 1mm x 10µm | Ø 1mm, Ø 2mm, or Ø 3mm | 1mm x 65µm | Ø 1mm, Ø 2mm, or Ø 3mm |
Typical Measurement Speed (Sample Dependent) | ≈500-1000ms | ≈1000-3000ms | ≈2000-15000ms | ≈1000-3000ms |
Optical Head Dimensions | Varies Depending on Model/Angle | Height: 350mm (13.75″) Width: 205mm (8.0″) Depth: 225mm (8.85″) Weight: 3.5kg (7.75lbs) | Height: 230mm (9″) Width: 150mm (6″) Depth: 150mm (6″) Weight: 1.6kg (3.5lbs) | Height: 300mm (12″) Width: 1000mm (40″) Depth: 300mm (12″) Weight: 12kg (25lbs) |
Accuracy | ||||
Spectral Reflectance/ Spectral Transmission | ± 0.2% | ± 0.5% | ± 0.5% | ± 0.5% |
Tristimulus (CIE 1931 X, Y, Z) | ± 0.05 | ± 0.05 | ± 0.05 | ± 0.05 |
Chromaticity (CIE 1931 x,y) | ± 0.002 | ± 0.005 | ± 0.005 | ± 0.005 |
LAB Color (CIE 1976 L*, a*, b*) | L* ± 1.0 a*, b* ± 0.8 | L* ± 2.0 a*, b* ± 0.8 | L* ± 2.0 a*, b* ± 0.8 | L* ± 2.0 a*, b* ± 0.8 |
Reported Parameters | ||||
Spectral Data | Reflectance/Transmission as a function of wavelength | |||
Colorimetric Data | CIE Tristimulus X, Y, Z, with 2° or 10° View Angle, (L*, a*, b*), (x, y), (u’, v’), and other parameters | |||
Illuminant Weighting | Illuminant A, Illuminant B, Illuminant C, Illuminant D65, or User Specified Custom Illuminant | |||
Specifications are subject to change without notice. |
Technology
- Gamma Scientific Model 191 Series Reflectometer Heads isolate the first surface reflection
- The second surface is completely eliminated in a non-destructive manner
- Light reflecting off each surface will be slightly offset
- This offset is used to mechanically block light reflected off lower surfaces