Avian Optics and
Spectroscopy Group

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Murakami Color Research Laboratory
GP-5 Goniophotometer

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Goniophotometric measurements are those where the incident and detection angles are varied, and typically many incident/detection pairs are measured to quantify some aspect of the appearance of a material or object. The GP-5 accomplishes these measurements by automatic and independent change of incident and receiving angles. This multi-angle measurement provides analysis of the intensity distribution of reflected or transmitted light as shown in the diagrams below. By providing this accurate intensity distribution the GP-5 is an indispensable instrument for the quantification of appearance. Included software performs complete instrument control as well as the datas processing and visualization of the results.
The beams from the light source are converged onto the pin hole through the condenser lens, and converted into parallel beams through the collimator lens. These beams reach the specimen plane through the beam iris. The beams reflected or transmitted from the specimen plane are fed to the receptor via a telescope lens and a receiving iris. Thus, the reflectance, transmittance and diffuse reflectance of the specimen can be obtained by measuring the light intensity.
Applications
  • Analysis of the properties of the transmitted light for plastics or glass
  • Measurement of the roughness of metals or painted plane by optical stylus
  • Analysis of the optical properties of materials with magnetic paints
  • Analysis of the properties of paper
  • Investigate the optical appearance of natural timbers and planted timbers
  • Evaluation of surface properties of high gloss materials
  • Investigate the optical appearance of textile or fabrics
Measurement Structure

1. Luminous Flux
2. Light Source
3. Receptor
4. Sample Optical system
The GP-5 is an ideal instrument for the Analysis and Quantification
of Appearance, Texture, and Luster on object and material surfaces.
Halogen Concave Diffraction Grating Silicon Measurement Capability Measuring Time Measuring Size Interface

As with all Murakami instruments, integrated control and data processing software
is included with the purchase of the GP-5.
Capabilities Training Services Representation &
Distribution		 Services &
Support		 Meet the People

Avian Optics and Spectroscopy Group