The polarization capabilities are derived from the sensor’s unique 4-way polarized filter array, which consists of four separate polarizing filters – angled at 0°, 45°, 90°, and 135° - that have been arranged in a regular pattern across the sensor. Thus, each block of four pixels can be used as a calculation block to determine the angle and intensity of light reflecting from objects, as well as several other calculations.
The use of polarization filters can not only mitigate reflections and hot spots, particularly when inspecting plastics, glass, and other shiny materials, but can also enable analysis of material thickness, stress points, and other potential defects not detectable using standard machine vision techniques.
The GO-5100MP-PGE has a full resolution of 2464 x 2056 pixels, though the 4-way polarization design of the sensor reduces the effective resolution of the output to approximately 1.25 megapixels. The camera delivers 8-bit full resolution output at 22.7 frames per second, with 10-bit and 12-bit output also supported. Pixel size is 3.45 µm x 3.45 µm for a 2/3” optical format.
In addition to being able to provide raw polarization output for all pixels, the camera includes a built-in function for pre-calculating AoLP (angle of linear polarization) – the angle of polarized light striking each 4-pixel block – and DoLP (degree of linear polarization) – which represents the strength of the polarized component relative to the total light falling on the block. By performing these initial calculations in the camera, host resources can be freed up to concentrate on other aspects of the application.
Other camera features include an ROI function, shading compensation, and gamma correction. The main camera body is a compact 29 x 29 x 41.5 mm, with a lens mount supporting standard C-mount lenses. Like other Go Series cameras, it is built to high standards for shock (80G) and vibration (10G) to enable it to perform in industrial environments with an MTBF rating of more than 150,000 hours.
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