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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




Please refer to the gonio measurement overview page for general considerations of the various instrumentation.

The GP-200 the mid-level cost alternative of the Murakami goniophotometric product line. Like the GP-5, the GP-200 ulitilizes a manual incident angle adjustment and manual flop angle adjustment. However, to increase sensitivity of the measurement, the GP-200 is equipped with a photomultiplier tube (PMT) detector. This instrument is therefore suited for those applications where fewer incident angles are required, but very accurate measurement of small or dark samples is enabled by the PMT. Customers with requirements that the include extensive angular (and therefore automatically adjusted) measurements should consider the GP-700 which is equipped with automatic incident angle adjustment.

The GP-200 is suitable for a wide variety of applications including:

  • Analysis of the properties of the transmitted light for plastics or glass
  • Measurement of the roughness of metals or paints
  • Analysis of the optical properties of materials with magnetic paints
  • Analysis of the properties of paper
  • Analysis of the optical properties of hair
  • Investigation of the optical appearance of wood
  • Evaluation of surface properties of high gloss materials
  • Investigation of the optical appearance of textile or fabrics
  • Measurement of the properties of transmittance for diffuser, prism sheet and polarized film of LCD back light.

Operational Information

The beams from the light source converge onto the pin hole field stop through the condenser lens, and are then converted into parallel beams through the collimator lens. These beams reach the specimen plane through the beam iris. The beams are reflected from (or transmitted through) the specimen plane and then focused onto the detector via a final field stop, focusing lens, and receiving iris. Thus, the reflectance, transmittance and diffuse reflectance of the specimen can be obtained by measuring the light intensity relative to the reference standard.


Light source

Halogen 12V/50W



Source iris

2 to 20 mm diameter variable

Receptor aperture angle

0.5° to 2.9° variable

Receptor angular resolution

0.1°(Absolute encoder’s)

Incident angle


Specimen table inclination angle

0 to 20°manually-adjusted

Receptor rotation angle

180°±0.3° automatically-adjusted

Photometric accuracy




Sample size range

min 50 x 50 mm
max 130×110 mm

max thickness 10 mm

Power consumption

300W approx., 100V AC


(BODY) L 810× W 720×H 540 mm


L 210 ×W 510 ×H 150 mm


approx.80 kg


(Optical units) Polarization unit, laser, interference filter, others

(Sample stage)

Moving on X-axis sample rotation with inclination and table for hair measurement

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