An interesting type of non-contact safety sensors are the capacitative proximity sensors.
This type of sensor creates an invisible electric field around it and can detect the presence of vehicles, motorcycles, bicycles, people and objects made of various material in their vicinity. The sensor can be installed along the edge of a moving leaf or beam thus offering protection in areas that are difficult to cover with conventional sensors.
The sensor has a limited detection field (a few tens of centimeters - depends on size of object) but this is still a marked improvement over contact sensors (ie safety edges).
One manufacturer of such gate safety sensors is Invisa, Inc.. Be sure to view their Invisa, Inc. on YouTube to get an idea of how this sensor works.
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