Polarised imaging is suited to the inspection of carbon fibres because the fibres polarise light parallel to their direction
a fundamental property of light that describes the direction in which the electric field of light oscillates. While the majority of illumination sources emit unpolarised light, reflections from non-metallic or semi-transparent surfaces, such as glass, plastics, or water, can cause some of it to become polarised in a particular direction – depending on the surface characteristics of the material. Tis can also happen when light passes from one medium to another. Polarisation filters can be used, but the
equipment set-up can be complex, oſten requiring multiple filters oriented to different directions of polarisation. Companies have also positioned micro-polarising filters on top of off-the-shelf image sensors, but this is expensive to manufacture. Not only is the new Sony
With the
sensor more practical and more advanced than alternative polarised imaging solutions, Sony is able to produce the sensors at a much lower cost. Tis presents camera manufacturers with an opportunity. ‘With the significantly lower cost of Sony’s sensor, more companies will now be able to buy polarisation cameras and try them out, to see how they can augment their existing industrial inspection applications,’ remarked Jenson Chang, product marketing manager at Canadian company Lucid Vision Labs. Lucid Vision was among the first to deliver a
significantly lower cost of Sony’s sensor, more companies will now be able to buy polarisation cameras
customers] are combining polarisation with other imaging technologies,’ Chang said. ‘Tey can use high-performance standard cameras to inspect most of what they need, then polarisation is just used to improve their accuracy in certain areas – so they don’t really need a high frame rate.’ Customers are instead requesting higher resolution, he added. However, this is limited by the sensor technology itself, rather than the camera. Lucid Vision has plans to incorporate the IMX250MZR into other camera platforms in the future. In the meantime, the firm intends to release another version of the Phoenix camera featuring the IMX250MYR colour version of Sony’s polarised sensor in the coming months. Teledyne Dalsa is another
imaging firm that has identified the potentials of Sony’s polarised sensor, now offering the Genie Nano M2450 area scan polarisation camera. Te model joins the
camera incorporating Sony’s new monochrome sensor to the machine vision market. Te Phoenix polarisation 5.0 megapixel camera is supplied in a 24 x 24mm form factor, and can capture up to 24 frames per second via a GigE vision interface. ‘Most of the time they [Lucid Vision
www.imveurope.com @imveurope
company’s Piranha4 Polarization line scan camera, which was released towards the end of last year. Tis camera is based on a custom CMOS sensor that – similar to the Sony sensor, uses nanowire micro-polariser filters – but positioned in quad-linear architecture. Te Piranha4 camera offers a maximum line rate of 70kHz and can output independent images of 0°, 90° and 135° polarisation states, as well as an unfiltered channel, which captures the total intensity, equivalent to a conventional image. Te Genie Nano area camera incorporates
Sony’s monochrome sensor and comes in a 21.2 x 29 x 44mm format. Offering an augmented 35 frames per second via GigE Vision, the camera’s higher frame rate can be attributed
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