The new autocollimation retro-reflective sensor FR 20 RLO from Sensopart sees perfectly in close-up range and can even look through bore holes. In contrast to standard light barriers, this sensor is ideal for the detection of objects at short distances as well as behind bore holes and apertures. Unlike “two-eyed“ retro-reflective sensors, the light beams transmitted and received are directed through the same lens with the autocollimation principle. A small bore hole or slit therefore suffices for autocollimation systems to detect objects moving behind them – the FR 20 RLO can therefore, for example, detect objects behind guide rails or look through the valve hole of a bicycle rim to position it for automatic spoking. As an autocollimation sensor is ideal for use in the close-up range, it can be positioned very close to the process.