Incremental rotary encoders promise greater signal generation efficiency

10 July 2017

Pepperl+Fuch’s BlueBeam technology for incremental rotary encoders with optical sensing principle is said to increase efficiency when generating signals. Specially developed blue emitter LEDs, combined with finely structured sensing chips, allow a more energetic penetration depth of the blue light in the chip. The result is a higher resolution, a significantly improved signal amplitude, and a improved signal quality.

With the new ENI58IL rotary encoders, Pepperl+Fuchs provides standard solutions for high rotational speeds, wherever requirements for dynamics are increasing.

BlueBeam is, essentially, a specially developed blue-light LEDs, which offer performance features that have traditionally only been possible in high-performance special solutions. 

The blue light from the new emitter LEDs exhibits a decreased diffraction compared to a longer-wave infrared light of the same gap width which allows it to depict sharper images. Combined with sensing chips that have finer and thinner structures, the penetration depth of the blue light into the chip is shorter or more energy rich. This increases the efficiency factor of the light source so that the sensing chip can generate sharper contours. The result is a higher resolution, improved signal amplitude, and reduced edge jitter. 

Tolerances of the phase position A to B are reduced to below 10 %, which is said to be double the signal quality compared to values that are otherwise common on the market and achievable with infrared technology. 

The more reliable scan rate also results in a higher resolution, enabling the ENI58IL rotary encoders to offer absolute accuracy, even in ranges of up to 12,000 rpm. Maximum output frequency is 400 kHz—up to 50% higher than standard rotary encoder variants. 

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