Anti-reflection coatings improve accuracy for high performance cameras

Posted by Gretchen Alper on Thu, Mar 3, 2011

Custom anti-reflection coatings with Adimec cameras

Reflection in the optical path can limit the performance of a vision application significantly. A sensor with anti-reflection coating on the cover glass reduces the reflections within the optics-sensors combination. For optimal results application specific anti-reflection coatings can be used. These coatings are optimized to eliminate reflections in a certain wavelength. Custom coatings make an excellent fit to applications where precision is critical.

example of the effect of anti-reflective coating:

Figure 1: General example of the effect of anti-reflective coating:  The spectral reflectivity of a single-layer, quarter-wave MgF2 coating, compared with the reflectivity of uncoated glass.  The solid curves are for glass of index 1.69 and the dashed lines are for an index of 1.517.

For Adimec’s QUARTZ camera series, enhanced Anti-Reflection Coating (ARC) options are now available. The new offerings can significantly improve the quality and accuracy of its cameras by reducing reflection to as little as 0.25% of the light beams processed by the sensor. While standard ARC’s delivered with off-the-shelf sensors typically provides protection levels of 2% of light at bandwidth ranges of 400 – 700nm, the Adimec solutions can consistently achieve sub- 0.5% protection at bandwidths of 400nm up to 900nm.cameras are available off-the-shelf without anti reflection coating or with a general coating.

The Adimec ARC options are available in single and multilayer configurations, with protection levels ranging from 2% to 0.25% depending on bandwidth required. The company also offers custom ARC solutions to provide a specific level of protection to meet individual product requirements. The custom solutions allow further optimization that takes into account the spectral characteristics of the intended application, determined by factors such as illumination, lenses and mirrors.

Example of effects on transmittance for various layers of anti-reflective coating

Figure 2: Example of effects on transmittance for various layers of anti-reflective coating

Adimec has a proven expertise in applying custom ARC to high-performance cameras. It utilizes its state-of-the art facility to ensure unmatched levels of cleanliness in the application process, as well as using the premium quality glass in its cameras. The result is the industry’s highest level of ARC protection available.

The Adimec ARC options enhance the sensitivity of the sensor being key in many applications. In machine vision applications, too much reflection on the sensor (i.e. more than 2%) interferes with the light reflected by the device under test. This causes measurement errors. By offering protection levels that result in as little as 0.25% reflection, the Adimec solutions greatly improve the accuracy that can be achieved with their cameras.

Want to know more about the Adimec QUARTZ series?

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Topics: Vision System Optimization, Optical Enhancements