Introduction of Visible Light Transmittance Meter

Introduction of Visible Light Transmittance Meter

The visible light transmittance meter is applicable to a wide range of visible light wavelengths. It is generally used to measure transparent or semi-transparent materials. This method has high measurement accuracy.

The visible light transmittance meter applications: automotive manufacturing and testing, glass products, aerospace and other field measurement, measurement of light transmittance of glasses, sunglasses, sun protection film, plastic products, transparent or semi-transparent materials. Now it has become a fashion to use colored glass as the windshield of the car. The car glass is pasted with sunscreen film. By using drtg-81 portable transmittance instrument, the visible light transmittance of colored glass can be simply and intuitively tested. Drtg-81 has the characteristics of small measurement error, high reliability, good stability and simple operation, etc., which is an indispensable testing instrument for the control and guarantee of product quality. It is widely used in the transparent or semi-transparent material manufacturing industry, commodity inspection and other testing fields.

Principle of visible light transmittance meter

When a parallel beam of light enters a certain medium (such as transparent plastic), it will change its direction (diffusion and deflection) due to the uneven optical properties of the material, surface defects, uneven internal organization, and the presence of bubbles and impurities, etc., resulting in some chaotic light called scattered light.

Internationally, the ratio between the scattering light flux and the transmitted light flux deviating from the direction of incident light through the sample is expressed as a percentage, which is called fog degree. A foggy sample will give a more ambiguous feeling. When the light passes through the sample, there will be a loss. That is, the transmitted light flux through the sample is always less than the incident light flux on the sample. The ratio of the two, expressed as a percentage, is internationally defined as light transmittance.