GP-200 Goniophotometer

Goniophotometric measurements are those where the incident and detection angles are varied. Typically many incident/detection pairs are measured to quantify some aspect of the appearance of a material or object. The GP-200 accomplishes these measurements by independent change of illumination and receiving angles. This multi-angle measurement provides analysis of the intensity distribution of reflected or transmitted light. By providing this accurate intensity distribution the GP-200 is an indispensable instrument for the quantification of appearance. Included software performs complete instrument control as well as the data processing and visualization of the results.

Several optional sample holders are available, including automatic rotation, automatic translation, manual flop adjustment, and a specially designed holder for hair measurements. The optical properties of the GP-200 Goniophotometer are designed to set the incident light and receiving angles appropriate for each material to be measured. Therefore these instruments permit the study of the structure of polymeric materials, and the control of optical density and surface properties.

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.

For all of these applications, the GP-200 will provide unrivaled insight into your materials properties and process results. Its unique measurement capabilities make this instrument one that will be able to deliver critical information for your products and systems. GP-200 robustness and flexibility will allow you to trust that your future measurement requirements will be met.

Operational Information

The beams from the light source converge onto the pin hole through the condenser lens, and then 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 focused onto 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.

Specifications