Birefringence unevenness inspection of transparent resin molded products

Inspection of transparent resin molded products

Our birefringence measurement products, like PA series, WPA series, including WPA-KAMAKIRI, are widely used for visualization and quantitative evaluation of residual stress distribution, which can cause cracking or degradation of optical performance such as MTF and transmittance degradation.

Internal Stress in Molded Product

Phase difference distribution sensitively reflects differences in molding conditions, making it ideal for process control. Good products (above) and defective products (below) can be compared and quantitatively judged as good or bad.

Visualization of resin flow

During plastic lens molding, when gate distortion extends to the effective diameter, resolving power of the final lens is degraded. Quantitative evaluation enables determination of low distortion molding conditions in a short period of time.

Quality control of processing

Defective drilling of molded products increases residual stress and causes cracks and other defects.
The inspection can be performed in a short time (approx. 1 minute) for quality control of residual stress after processing.

related product

PA-300-MT

High-speed, high-resolution measurement of birefringence/retardation targeting the low measurement range (0～130nm), for example glass, optical lens, etc.Separable light source which can be incorporated into inline and measurement stage.

PA/WPA-NIR Series

By using the near-infrared band for the measurement wavelength, this system can measure birefringence/phase difference distribution even for materials that are opaque to the naked eye. Suitable for measurement targets that transmit near-infrared wavelengths, like chalcogenide lenses, LiDAR automotive components, etc.

WPA-micro

A series that expands the measurement range of phase difference from 0 to 3,500 nm by measuring the distribution of birefringence/phase difference over 3 waves. Predict with FOV of microscope. The included microscope can be selected either Olympus or Nikon.

WPA-KAMAKIRI

This product is very effective if evaluation with high spatial resolution is essential.With the WPA series, it is possible to measure a phase difference of about 3000 nm by selecting three different wave lengths and comparing and calculating the phase difference at each wave length.

#Birefringence & stress strain measurement solutions
#2-D Birefringence Measurement System
#Birefringence Measurement System

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