| 摘要 |
<p>A device and method for detecting pressure changes in a pressurized vessel (10), such as a gas storage bottle of an inflator of a vehicle restraint system. At least two reference marks (12) are positioned on an outside surface (14) of the vessel for indicating the pressure in the vessel. The marks are spaced apart on the surface by a predetermined distance. The predetermined distance can be measured at intervals, and correlated to determine changes in the pressure of the vessel. The references marks can be physical, i.e., paint or scratch marks, or magnetic, such as a magnetic bar or stripe. The physical marks can be read by an optical laser and the magnetic marks by a magnetic head, such as a floppy or hard disk drive, or a CD-ROM. <IMAGE></p> |
