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Ask Mike asked How do elevators know to keep the doors open when somebody sticks their arm in between them?
I'd love specifics on how the "sensors" work. Have they ever failed and injured someone?
And got the following answer:
there are a number of ways to sense a obstruction. The most common are strain gauges, capacitive proximity switches, and of course beam interrupt photo diodes. 1) The strain gauge is a contact one, once a small amount of force is applied a small electrical voltage is changed, and thru various op-amps and relays, triacs, etc.. the door is triggered to open. strain gauges can be sensitive to just a few inch pounds of force. This is most common in the safety systems of garage door openers. 2) proximity switches work by detecting a change in a known oscillation with just a the addition of a capacitive object, we homo sapiens are incredibly capacitive. So the oscillator circuit is increased or decreased by the application of more inductive capacitance ( body ). This is designed into a negative switching or positive switching signal ( depending on design ) and with various op amps, relays, triacs, etc.. the door is triggered. 3) beam interrupt, this is real simple a beam of infrared light is interrupted and a op amp comparator ( or similar circuit) creates a switching action and thru relays, triacs, etc.. the door is triggered. As far as failing to work the most common tactic in this form of design is to use redundancy. You will see several types of sensor used in most applications. Elevators are most often regulated to have regular inspections, and have a regular service interval. With this approach the elevator is by far incredibly safe. The odds of multiple system failures with just three redundancies is almost astronomical. Be safe.