Reflectance/Transmission Measurement Equipment

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.

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

##### GS-191FA-1045 Rotary Reflectance Measurement Systems

## Download Data Sheet (PDF)

## 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

### 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 Head | 10 Degree Optics | 45 Degree Optics |

Measurement Type | First Surface Specular Reflection | First Surface Specular Reflection |

Sample Types | Glass | Glass |

Illumination Angle | 10° | 45° |

Viewing Angle | 10° | 45° |

Minimum Sample Thickness (First Surface Reflectance Only) | 0.5mm (transparent samples) | 0.25mm (transparent samples) |

Maximum Sample Thickness | 6mm | 6mm |

Maximum Sample Size | 325mm x 225mm Panel | 325mm x 225mm Panel |

Spectral Range | 360nm-830nm | 360nm-830nm |

Illumination Spot Size (Area of Analysis) | 1mm x 10µm | 1mm x 10µm |

Measurement Speed (Sample Dependent) | <1500ms | <1500ms |

Calibration Reference Standard | Built in BK-7 Polished Glass | Built in BK-7 Polished Glass |

Semi-Auto System Specifications | ||

191 Optical Head | 191F-1045 Dual Angle Optics | |

Measurement Program Types | Five 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 Time | Program dependent, each measurement point takes ~1500ms | |

System Dimensions | Height: 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* ± 0.8 | L* ± 2.0 a*, b* ± 0.8 |

Average Reflectance | ± 0.2 | ± 0.2 |

Reported Parameters | ||

Spectral Data | Reflectance 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 |

GS-191FA-1045 Rotary Reflectance Measurement Systems | ||
---|---|---|

191 Optical Head | 10 Degree Optics | 45 Degree Optics |

Measurement Type | First Surface Specular Reflection | First Surface Specular Reflection |

Sample Types | Glass | Glass |

Illumination Angle | 10° | 45° |

Viewing Angle | 10° | 45° |

Minimum Sample Thickness (First Surface Reflectance Only) | 0.5mm (transparent samples) | 0.25mm (transparent samples) |

Maximum Sample Thickness | 6mm | 6mm |

Sample Size | Customer Defined One Machine Can Support Three Different Panel Sizes | Customer Defined One Machine Can Support Three Different Panel Sizes |

Spectral Range | 360nm-830nm | 360nm-830nm |

Illumination Spot Size (Area of Analysis) | 1mm x 10µm | 1mm x 10µm |

Measurement Speed (Sample Dependent) | <1500ms | <1500ms |

Calibration Reference Standard | Built in BK-7 Polished Glass | Built in BK-7 Polished Glass |

Rotary System Specifications | ||

191 Optical Head | 191F-1045 Dual Angle Optics | |

Measurement Locations Per Panel | Three measurement locations standard Configurable up to five locations Configurable for 10 and 45 degree measurement at any location | |

Glass Stations | Eight 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 Dimensions | Height: 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* ± 0.8 | L* ± 2.0 a*, b* ± 0.8 |

Average Reflectance | ± 0.2 | ± 0.2 |

Reported Parameters | ||

Spectral Data | Reflectance 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 |

191F Reflectance Measurement Systems | ||||
---|---|---|---|---|

191 Optical Head | 191F-0 | 191F-10 | 191F-20 | 191F-45 |

Measurement Type | Total Specular Reflection | First Surface or Total Specular Reflection | First Surface or Total Specular Reflection | First Surface or Total Specular Reflection |

Sample Types | Glass, Plastic, Metal, Polished Substrates | Glass, Plastic, Metal, Polished Substrates | Glass, Plastic, Metal, Polished Substrates | Glass, Plastic, Metal, Polished Substrates |

Illumination Angle | 0° | 10° | 20° | 45° |

Viewing Angle | 0° | 10° | 20° | 45° |

Minimum Sample Thickness | None (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 Thickness | None | None | None | None |

Minimum Sample Size | None | 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 | 2.0″ (50mm) diameter or 1.75″ x 1.75″ (45 x 45mm) square |

Maximum Sample Size | Maximum 3.0in (75mm) diameter | None | None | None |

Spectral Range | 365nm-1100nm | 365nm-1100nm | 365nm-1100nm | 365nm-1100nm |

Illumination Spot Size (Area of Analysis) | Ø 0.5mm | 1mm x 10µm | 1mm x 10µm | 1mm x 10µm |

Measurement Speed (Sample Dependent) | ≈500-10000ms | ≈300-3000ms | ≈300-3000ms | ≈300-3000ms |

Calibration Reference Standard | 1″ (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 Dimensions | Height: 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* ± 0.8 | L* ± 1.0 a*, b* ± 0.8 | L* ± 1.0 a*, b* ± 0.8 | L* ± 1.0 a*, b* ± 0.8 |

Average Reflectance | ± 0.1 | ± 0.1 | ± 0.1 | ± 0.1 |

Reported Parameters | ||||

Spectral Data | Reflectance 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 |

191T Transmission Measurement Systems | ||
---|---|---|

191 Optical Head | 191T | |

Measurement Type | Total Transmission | |

Sample Types | Glass or any polished transmissive element | |

Illumination Angle | 0° | |

Viewing Angle | 2π (180°) | |

Minimum Sample Thickness | None | |

Maximum Sample Thickness | 15mm | |

Minimum Sample Size | Ø 10mm | |

Maximum Sample Size | 200mm 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 Standard | BK-7 Polished Glass | |

Optical Head Dimensions | Height: 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 Data | Transmission as a function of wavelength | |

Colorimetric Data | ||

Illuminant Weighting | Illuminant A, Illuminant B, Illuminant C, Illuminant D65, or User Specified Custom Illuminant |

191 Series Optical Heads | ||||
---|---|---|---|---|

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 | ||||

Illuminant Weighting | Illuminant A, Illuminant B, Illuminant C, Illuminant D65, or User Specified Custom Illuminant |