Abstract
An acoustic emission automotive crash sensor arrangement which includes a continuous loop type wave guide welded at a number of locations to the vehicle structures likely to be deformed upon impact of the vehicle with an object. The ends of the loop are secured to a piezoelectric crystal, the output of which is digitized and compared in a microprocessor to preprogrammed threshholds for several different parameters of the acoustic emission event to determine whether an impact of sufficient severity has occurred to require actuation of an occupant restraint. In other embodiments: the ends of the wave guide may be secured to individual crystals; the loop type wave guide may be connected to all or certain of the vehicle structures by branch wave guides; and individual wave guides may be connected between the vehicle structures and the crystal.
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