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Measurement solution of reflectance and transmittance for film, lens and glass

1.Test principle of transmittance and Haze

Due to light scattering, The interior or surface of transparent or translucent materials will produce cloudy or turbid appearances, and luminous transmittance and haze are important indices to measure the transparency of the material.

Luminous transmittance is the ratio of the luminous flux transmitted by a body to the flux incident upon it .

Haze is another important parameter describing the physical properties of transparent materials, which represents the scattering ability of materials to transmitted light. Haze refers to the percent of transmitted light that is scattered so that its direction deviates more than a specified angle from the direction of the the incident beam..


原理示意图


 Measurement solutions for different test requirements

For different types and sizes of materials, different spectral band testing requirements, EVERFINE can provide measurement solutions for different spectral range requirement,to meet higher requirements, as follows.


1.Reflection / transmission spatial distribution measurement solution:BBMS-2000 BRDF/BTDF Measurement System

BBMS-2000 BRDF/BTDF Measurement System can comprehensively analyze the reflection and transmission characteristics of the material surface. The measurable parameters include bidirectional transmission distribution function(BTDF), bidirectional reflectance distribution function(BRDF), reflectance ratio distribution, transmission ratio distribution, total  integrated reflection (TIR) and total integrated scatter(TIS). It can be applied in many fields, e.g. optical membrane, plastic, paper, textile, glass, coating, metal and so on, to characterize the optical appearance quantitatively.In addition, the BRDF/BTDF data can be imported into optical design software for optical system simulation design.

Measurement principle of BBMS-2000

 

BBMS-2000 BRDF/BTDF Measurement System


2.Full band inverse / transmission test scheme:TR-5000 US-VIS-IR Transmittance and Reflectance Test System for Materials

280nm-2500nm极宽的测量范围,满足GAT744-2013标准要求。

The visible light transmittance, ultraviolet transmittance, sunlight transmittance, visible light reflection ratio, and spectral transmittance / reflectance curves of various kinds of films, glass and lenses are measured, and the color characteristics of the materials are analyzed, and the measurement of 280nm-2500nm is very wide to meet the requirements of the GAT744-2013 standard.

 

TR-5000 US-VIS-IR Transmittance and Reflectance Test System for Materials


3.Measurement scheme for visible spectral transmittance and haze of materials:HAM-300 High Accuracy Spectral Haze Meter and HAM-200 Haze Meter

HAM-300 can be used to test and analyze the transmittance, haze and photochromatic properties of materials under specific light sources, such as total transmittance, spectral transmittance curves at different wavelengths, scattering transmittance, parallel light transmittance, fog, and optical color properties of materials under A, C and D65 light sources. It can be widely used in plastics, films, glass or LCD panels.

 

HAM-300 High Accuracy Spectral Haze Meter




HAM-200 adopts EVERFINE’s high accuracy photometry measurement detector technology, which is applied to measure total transmittance, diffuse transmittance, haze, and parallel transmittance of resin, plastics, glass film, cover glass of LCD and liquid etc.


 

HAM-200 Haze Meter