Omni-directional crash sensor
First Claim
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1. A stress wave sensor comprising a piezoelectric film and means therein for connection to sensor electronics.
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Abstract
A stress wave sensor comprising a piezoelectric film and means therein for connection to sensor electronics. The piezoelectric film preferably comprises polyvinylidene fluoride. Also a stress wave sensor system and methods employing one or more such stress wave sensors, preferably attached to a vehicle transparent component, most preferably to the vehicle windshield.
22 Citations
16 Claims
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1. A stress wave sensor comprising a piezoelectric film and means therein for connection to sensor electronics.
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2-3. -3. (canceled)
- 4. An impact detection system comprising a plurality of stress wave sensors each comprising a piezoelectric film, said system optionally comprising one or more accelerometers, wherein each stress wave sensor is attached to a vehicle skin, structural, or transparent component, and preferably to a transparent component.
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6. A method of characterizing a vehicle crash condition by reference to output from a plurality of sensors each comprising a piezoelectric film, the method comprising the steps of collecting output from the plurality of sensors;
- and analyzing one or more of the group consisting of;
one or both of amplitude and rise time of each sensor'"'"'s output;
each sensor'"'"'s output in a plurality of frequency bands, preferably from at least bands at approximately lkHz-2.5 kHz and 5 kHz-20 kHz; and
time differentiated outputs of the sensors. - View Dependent Claims (7, 8, 9, 16)
- and analyzing one or more of the group consisting of;
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10. A vehicle windshield comprising a crash sensing system comprising one or more piezoelectric stress wave sensors positioned in or on the vehicle windshield.
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11-15. -15. (canceled)
Specification