The PA2 is a visual inspection tool used to check the polarization axis of individual, unmounted lenses—a crucial step in quality control before assembly.
The device is equipped with individually mounted split-field polarizers, illuminated from behind. By adjusting the side levers, the operator can rotate the polarizers to measure how much the lens’s polarization axis deviates from the reference point, shown in degrees.
To perform the check, the lens is placed on dedicated supports. The operator then moves the lever until the two halves of the illuminated field appear evenly lit. A pointer moves along a degree-calibrated scale, providing a clear and accurate reading of the deviation.
The PA2 also includes a calibration plate to ensure proper alignment of the polarizers.
It’s a practical and reliable tool, ideal for lens production companies, where early-stage precision and compliance are essential.
The polarization axis of a lens is the direction along which its polarizing filter lets light pass. This is a key element in the design of polarized lenses, which are usually oriented vertically—about 90° from the horizontal.
This vertical alignment helps block reflected light from flat surfaces like water, snow, or wet roads, significantly reducing glare.
According to ISO 12312-1:2022, the declared polarization axis must not deviate more than ±5° from the vertical (or from a specified direction, if different). The alignment between the left and right lenses in a pair of polarized glasses must not differ by more than 6°.
Our polarization axis testing tools help manufacturers ensuring their lenses meet international standards with precision and ease.
TECHNICAL DATA
- Power supply: 230 single phase
- Electric Power: 3W
- Dimensions: 11x22x13 cm
- Weight: 1,7 Kg
