The 191F Reflectance Measurement Heads are available in fixed angle of incidence configurations ranging from 0 to 45º.  A handheld unit with variable angle of incidence is also available, please contact us for further details.  The models are capable of first surface or total specular reflection on glass, plastic, metal or polished substrates, and can be used with sample sizes as thin as 0.15 mm. The spectral range is from 365nm to 1100 nm.

Highly Accurate & Repeatable Reflection Measurements

  • Nondestructively capture complete spectral and colorimetric properties with scan times as short as 300 msec per measurement point
  • Isolated first-surface measurement of thin glass substrates down to 0.15mm in thickness without requiring second-surface masking
  • Measure total reflectance or isolate internal optical interfaces
  • Test capability for first surface and specular surfaces
  • Configuration options including handheld, semi-automatic and fully automatic rotary systems with robotic loading

In addition to our exceptional technical and functional capabilities, Gamma Scientific is ISO/IEC 17025 accredited by NVLAP (NVLAP lab code 200823-0).

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