Reflectance/Transmission Measurement Equipment

reflectance measurement

Complete your inspections faster, and achieve higher standards of quality with accurate, repeatable reflectance and transmission measurement systems from Gamma Scientific.

Controlled optical geometry and industry leading spectroradiometer performance offer quick, accurate reflection/transmission measurements for any glass or polished transmissive element.

When measuring reflectance, Gamma Scientific’s unique technology allows manufacturers to perform single sided inspection on the first surface while excluding the second surface.

With handheld, semi-automatic and fully automated options, Gamma Scientific reflectometers have tremendous flexibility and can be used for R&D, QA and production line testing.

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GS-191SA-1045 Semi-Automated Dual Angle Reflectance Measurement Systems

GS-191FA-1045 Rotary Reflectance Measurement Systems

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Specular and Diffuse Measurement Systems for Measuring Virtually Any Sample

Gamma Scientific provides a unique, high performance option for reflectance and transmission testing. These systems capture complete spectral and colorimetric properties of thin film coatings with scan times typically less than one second.

Multi-layer film thickness and sample flatness can also be monitored in parallel.

Reflectance and Transmission test systems from Gamma Scientific are available in several configurations. Depending on the sample type and desired measurement result, a variety of system configurations are available for testing either polished (specular) or rough (diffuse) samples. A production selection guide is included in this brochure to help in configuring the best system for your needs.

These systems are ideal for manufacturers who need to obtain fast and accurate measurements of flat panel display glass, anti-reflection coating inspection, photovoltaic (solar cell) coatings, optical filters, lens coatings, paint samples, diffuse plastics and more.

Regardless of the sample, Gamma Scientific offers a solution for your reflectance or transmission measurement needs.

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
reflectance
reflectance

Gamma Semi-Automatic Anti-Reflectance Measurement (GSAARMeas) Software

  • Programmable, Multi-Location Reflectance Measurement
  • Real-Time Color Charts
  • Binning and Pass/Fail Compatibility
  • Automated Calibration
  • Simultaneous 10° and 45° Measurements
  • Multi-Layer Film Thickness, n & k Characterization
  • Sample Flatness Measurement
  • Bar Code Reader (optional)

Selection Guide

 

Reflectance and Transmission Measurement System Specifications

 

GS-191SA-1045 Semi-Automated Dual Angle Reflectance Measurement Systems
191 Optical Head10 Degree Optics45 Degree Optics
Measurement TypeFirst Surface Specular ReflectionFirst Surface Specular Reflection
Sample TypesGlassGlass
Illumination Angle10°45°
Viewing Angle10°45°
Minimum Sample Thickness
(First Surface Reflectance Only)
0.5mm (transparent samples)0.25mm (transparent samples)
Maximum Sample Thickness6mm6mm
Maximum Sample Size325mm x 225mm Panel325mm x 225mm Panel
Spectral Range360nm-830nm360nm-830nm
Illumination Spot Size
(Area of Analysis)
1mm x 10µm1mm x 10µm
Measurement Speed
(Sample Dependent)
<1500ms<1500ms
Calibration Reference StandardBuilt in BK-7 Polished GlassBuilt in BK-7 Polished Glass
Semi-Auto System Specifications
191 Optical Head191F-1045 Dual Angle Optics
Measurement Program TypesFive selectable program types, individually configurable
for up to five different panel sizes:

  • Five Point Cross (all points 10° & 45°)
    Five Point Cross (45° on center point only)
  • Three Point Diagonal (all points 10° & 45°),
    25 Point Grid (all points 10° & 45°),
    40 Point Grid (all points 10° & 45°)
Measurement Locations
  • Position coordinates can be individually set for
    five different panel sizes with 1mm resolution
  • Default settings have a grid starting 10mm in from each
    edge, with equal spacing between the corner locations
Cycle TimeProgram dependent, each measurement point takes ~1500ms
System DimensionsHeight: 1.25m
Width: 1.0m
Depth: 1.0m
Weight: approx. 300kg
Measurement Accuracy
Spectral Reflectance± 0.5%± 0.5%
Tristimulus
(CIE 1931 X, Y, Z)
± 0.05± 0.10
Chromaticity
(CIE 1931 x,y)
± 0.005± 0.005
LAB Color
(CIE 1976 L*, a*, b*)
L* ± 2.0 a*, b* ± 0.8L* ± 2.0 a*, b* ± 0.8
Average Reflectance± 0.2± 0.2
Reported Parameters
Spectral DataReflectance as a function of wavelength
Colorimetric DataCIE Tristimulus X, Y, Z, with 2° or 10° View Angle, (L*, a*, b*), (x, y), (u’, v’), and other parameters

 

 

GS-191FA-1045 Rotary Reflectance Measurement Systems
191 Optical Head10 Degree Optics45 Degree Optics
Measurement TypeFirst Surface Specular ReflectionFirst Surface Specular Reflection
Sample TypesGlassGlass
Illumination Angle10°45°
Viewing Angle10°45°
Minimum Sample Thickness
(First Surface Reflectance Only)
0.5mm (transparent samples)0.25mm (transparent samples)
Maximum Sample Thickness6mm6mm
Sample SizeCustomer Defined
One Machine Can Support
Three Different Panel Sizes
Customer Defined
One Machine Can Support
Three Different Panel Sizes
Spectral Range360nm-830nm360nm-830nm
Illumination Spot Size
(Area of Analysis)
1mm x 10µm1mm x 10µm
Measurement Speed
(Sample Dependent)
<1500ms<1500ms
Calibration Reference StandardBuilt in BK-7 Polished GlassBuilt in BK-7 Polished Glass
Rotary System Specifications
191 Optical Head191F-1045 Dual Angle Optics
Measurement Locations Per PanelThree measurement locations standard
Configurable up to five locations
Configurable for 10 and 45 degree
measurement at any location
Glass StationsEight glass stations
Three for loading/unloading
and five for measurement optics
Cycle Time<6 seconds per panel,
3 seconds maximum for loading and unloading
(cycle time increases if load/unload exceeds 3 seconds)
System DimensionsHeight: 1.75m
Width: 1.6m
Depth: 1.6m
Weight: approx. 1000kg
Measurement Accuracy
Spectral Reflectance± 0.5%± 0.5%
Tristimulus
(CIE 1931 X, Y, Z)
± 0.05± 0.10
Chromaticity
(CIE 1931 x,y)
± 0.005± 0.005
LAB Color
(CIE 1976 L*, a*, b*)
L* ± 2.0 a*, b* ± 0.8L* ± 2.0 a*, b* ± 0.8
Average Reflectance± 0.2± 0.2
Reported Parameters
Spectral DataReflectance as a function of wavelength
Colorimetric DataCIE Tristimulus X, Y, Z, with 2° or 10° View Angle, (L*, a*, b*), (x, y), (u’, v’), and other parameters

 

 

191F Reflectance Measurement Systems
191 Optical Head191F-0191F-10191F-20191F-45
Measurement TypeTotal Specular ReflectionFirst Surface or Total
Specular Reflection
First Surface or Total
Specular Reflection
First Surface or Total
Specular Reflection
Sample TypesGlass, Plastic, Metal,
Polished Substrates
Glass, Plastic, Metal,
Polished Substrates
Glass, Plastic, Metal,
Polished Substrates
Glass, Plastic, Metal,
Polished Substrates
Illumination Angle10°20°45°
Viewing Angle10°20°45°
Minimum Sample ThicknessNone (transparent samples)
None (opaque samples)
0.5mm (transparent samples)
None (opaque samples)
0.35mm (transparent samples)
None (opaque samples)
0.15mm (transparent samples)
None (opaque samples)
Maximum Sample ThicknessNoneNoneNoneNone
Minimum Sample SizeNone2.0″ (50mm) diameter
or 1.75″ x 1.75″
(45 x 45mm) square
2.0″ (50mm) diameter
or 1.75″ x 1.75″
(45 x 45mm) square
2.0″ (50mm) diameter
or 1.75″ x 1.75″
(45 x 45mm) square
Maximum Sample SizeMaximum 3.0in (75mm)
diameter
NoneNoneNone
Spectral Range365nm-1100nm365nm-1100nm365nm-1100nm365nm-1100nm
Illumination Spot Size
(Area of Analysis)
Ø 0.5mm1mm x 10µm1mm x 10µm1mm x 10µm
Measurement Speed
(Sample Dependent)
≈500-10000ms≈300-3000ms≈300-3000ms≈300-3000ms
Calibration Reference Standard1″ (25mm) BK-7 .
Polished Glass
6″ (150mm) BK-7
Polished Glass
6″ (150mm) BK-7
Polished Glass
6″ (150mm) BK-7
Polished Glass
Optical Head DimensionsHeight: 375mm (15″)
Width: 300mm (12″)
Depth: 300mm (12″)
Weight: 2.25kg (5lbs)
Height: 230mm (9″)
Width: 150mm (6″)
Depth: 150mm (6″)
Weight: 1.6kg (3.5lbs)
Height: 230mm (9″)
Width: 150mm (6″)
Depth: 150mm (6″)
Weight: 1.6kg (3.5lbs)
Height: 230mm (9″)
Width: 150mm (6″)
Depth: 150mm (6″)
Weight: 1.6kg (3.5lbs)
Accuracy
Spectral Reflectance± 0.2%± 0.2%± 0.2%± 0.2%
Tristimulus
(CIE 1931 X, Y, Z)
± 0.05± 0.05± 0.05± 0.05
Chromaticity
(CIE 1931 x,y)
± 0.002± 0.002± 0.002± 0.002
LAB Color
(CIE 1976 L*, a*, b*)
L* ± 1.0 a*, b* ± 0.8L* ± 1.0 a*, b* ± 0.8L* ± 1.0 a*, b* ± 0.8L* ± 1.0 a*, b* ± 0.8
Average Reflectance± 0.1± 0.1± 0.1± 0.1
Reported Parameters
Spectral DataReflectance as a function of wavelength
Colorimetric DataCIE Tristimulus X, Y, Z, with 2° or 10° View Angle, (L*, a*, b*), (x, y), (u’, v’), and other parameters
Illuminant WeightingIlluminant A, Illuminant B, Illuminant C, Illuminant D65, or User Specified Custom Illuminant

 

 

191T Transmission Measurement Systems
191 Optical Head191T
Measurement TypeTotal Transmission
Sample TypesGlass or any polished transmissive element
Illumination Angle
Viewing Angle2π (180°)
Minimum Sample ThicknessNone
Maximum Sample Thickness15mm
Minimum Sample SizeØ 10mm
Maximum Sample Size200mm x 200mm Panel
Illumination Spot Size
(Area of Analysis)
Ø 1mm, Ø 2mm, or Ø 3mm (user selectable at time of purchase)
Measurement Speed
(Sample Dependent)
≈300-3000ms
Calibration Reference StandardBK-7 Polished Glass
Optical Head DimensionsHeight: 350mm (13.75″)
Width: 205mm (8.0″)
Depth: 225mm (8.85″)
Weight: approx. 3.5kg (7.75lbs)
Measurement Accuracy
Spectral Transmission± 0.5%
Tristimulus
(CIE 1931 X, Y, Z)
± 0.05
Chromaticity
(CIE 1931 x,y)
± 0.005
LAB Color
(CIE 1976 L*, a*, b*)
L* ± 2.0 a*, b* ± 0.8
Average Transmission± 0.2
Reported Parameters
Spectral DataTransmission as a function of wavelength
Colorimetric DataCIE Tristimulus X, Y, Z, with 2° or 10° View Angle, (L*, a*, b*), (x, y), (u’, v’), and other parameters
Illuminant WeightingIlluminant A, Illuminant B, Illuminant C, Illuminant D65, or User Specified Custom Illuminant

 

 

191 Series Optical Heads
191 Series Optical Heads191F191T191C191DR
Measurement TypeSpecular Reflection
or Total Reflection
Total TransmissionSpecular ReflectionDiffuse Reflection
Sample TypesGlass, Plastic, Metal,
Polished Substrates
Glass, Plastic,
Transmissive Elements
Glass, Plastic, Metal,
Polished Substrates
Opaque Materials,
Matte Surfaces,
Rough Substrates
Illumination AngleFixed Angle at
0°, 10°, 20°, or 45° or
Dual Angle 10° & 45°
10° to 45° Variable45°
Viewing AngleMatches Selected Illumination
Angle
2π (180°)10° to 45° Variable45°
System ConfigurationHandheld, Tabletop,
Semi-Automatic, Fully Automated
TabletopHandheldTabletop (Sphere Based)
Minimum Sample ThicknessDependent on Angle
(transparent samples)
None
(transparent samples)
1.5mm (transparent samples)
None (opaque samples)
None (opaque samples)
Spectral Range365nm-900nm (default)
UV / IR Options
Available
365nm-900nm (default)
UV / IR Options Available
365nm-900nm365nm-900nm
UV / IR Options Available
Illumination Spot Size
(Area of Analyis)
1mm x 10µmØ 1mm, Ø 2mm, or
Ø 3mm
1mm x 65µmØ 1mm, Ø 2mm, or
Ø 3mm
Typical Measurement Speed
(Sample Dependent)
≈500-1000ms≈1000-3000ms≈2000-15000ms≈1000-3000ms
Optical Head DimensionsVaries 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* ± 0.8L* ± 2.0 a*, b* ± 0.8L* ± 2.0 a*, b* ± 0.8L* ± 2.0 a*, b* ± 0.8
Reported Parameters
Spectral DataReflectance/Transmission as a function of wavelength
Colorimetric DataCIE Tristimulus X, Y, Z, with 2° or 10° View Angle, (L*, a*, b*), (x, y), (u’, v’), and other parameters
Illuminant WeightingIlluminant A, Illuminant B, Illuminant C, Illuminant D65, or User Specified Custom Illuminant

 

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