Collision testing simulators are highly complex machines which incorporate sophisticated damping systems as well as integrated acceleration sensors. One of the real challenges when designing these simulators is to safeguard those in close proximity to the machine when it is in operation.
Multiple light beam safety devices from Leuze have been selected for many collision testing simulators, the latest of which is being developed in the measurement and sensor laboratory of the Institute for Natural Sciences and Mathematics at the University of Applied Sciences in Constance, Germany.
The structure of most collision simulators is essentially the same with a seat mounted on a guide block being driven at a defined acceleration and speed against a shock absorber, thereby simulating a vehicle collision. Various sensors record different parameters being measured during the event.
A Leuze multiple light beam safety device has been used to provide protection around the entire collision simulator while still allowing access while it is not operational. The three-beam Leuze COMPACTlaser system which is a type 4 system and certified to IEC/EN 61496 was selected for this application.
The sensor is mounted with the lowest beam positioned at a height of 300 mm with a total protective field height of 1100 mm being achieved at a beam distance of 400 mm. In this configuration, it is not possible for anyone to crawl under, run through or jump over the protective field.
This safety system consists of a transmitter and a receiver, and three deflecting mirrors which are used to safeguard the entire collision simulator from all four accessible sides. Special spring elements in the base of the free-standing deflecting mirror columns facilitate automatic resetting to the correct position after mechanical impacts.
To minimise set up time and allow optimum alignment quality, the device features an integrated red-light alignment laser on each axis. With the visible laser spot, system set up and alignment is a simple operation. The system is connected to the control of the collision simulator via a potential-free relay.
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