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P.O. Box 716
Sunapee, NH 03782-0716
603-526-2420 (office), 603-526-2729 (fax)

Goniometric (spectral)

Goniometric (photometric)


Gloss and Reflectance

Haze and Clarity

Online Systems
  Glossmeter GR-2
  Glossmeter GR-4
  Color CMTS-5000
  Color CMTS-5000T
  Hazemeter HMS-3
  Transmittance TM-100M


The Murakami Team
Murakami Products
Avian Technologies LLC
Murakami Corporate


GCMS-2 and GCMS-4

Instrument alone:
GSP-2 Gonio-spectrophotometer

GCMS-4 Gonio-spectrophotometric
Color Measurement System
(includes computer and GPIB interface)


The GCMS-4 is the ideal measurement system for gonio-apparent materials. These are materials that change color appearance depending on the viewing and illumination angles. Examples are pearl-mica coating surfaces and interference pigments. For these types of materials, this gonio-spectrophotometric color measurement system can measure its color by measuring the spatial distribution of reflected (or transmitted) light at user-selectable angles of illumination and detection.

The basic operation and theory of the GCMS-4 is similar to the GCMS-3B. Read that page for general capabilities of these goniospectrophotometric systems. The GCMS-4 features increased angular resolution and control. One major exception to this is that the GSP-2/GCMS-4 can also measure transmittance, also as a function of angle in the same fashion as reflectance. Contact Avian Group representatives to discuss the configuration of your instrument.

Like the GCMS-3B, the GCMS-4 can make measurements of a wide variety of gonio-chromatic applications including:

  • Pearl-mica and metallic paints
  • Anodised and metallised coatings and inks
  • Hair treatments – colorants and conditioners
  • Coated Glass
  • Plastics
  • Retro-reflective, coated and pearl-effect textiles
  • Cosmetics
  • Liquid-crystal displays

To the best of our ability, these are correct at the time of publication. Please contact AvianGroupUSA if you have questions on how to relate these specifications to your measurement requirements.

Measuring SystemDual-Beam Optics with Reference Plate
Measuring GeometryAdjustable illumination and viewing angles
Light Source12V 100W Halogen Lamp
Lamp Life1000 hrs Nominal
Dispersing elementConcave Diffraction Grating
DetectorSilicon Photodiode Array
Wavelength Range390 – 730 nm
Wavelength Interval10 nm
Spectral Bandpassapprox. 10 nm
Wavelength Accuracy± 1 nm @ 560nm
Wavelength Repeatability± 0.1 nm
Incident Angle Range 9° to 180°
Angular Accuracywithin ± 0.5°
Angular Resolution0.1° (resolution of absolute encoder)
Viewed Areaapprox. 8 x 16 mm at 0° receiving angle
approx. 8 x 106 mm at 81° receiving angle
(both with flapping angle = 0°)
Source Aperture Angle ±2.1° in plane of measurement
±4.2° perpendicular to plane of measurement
Detector Aperture Angle ±1.6° in plane of measurement
±1.4° perpendicular to plane of measurement
Measurement Durationapprox. 3 seconds per angle increment
Measurement Accuracywithin ± 0.5%
Repeatability 0.06% SD ( white tile measured 45°/0° at 560nm)
Dimensions (mm) 760 (W) x 1156 (D) x 965 (H)
Power Requirements 220V AC ±10V, 4A
Computer InterfaceGP-IB (PC) F by Contec Ltd
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