Coloured SEM of micro-accelerometer and pencil tip

Coloured SEM of micro-accelerometer and pencil tip

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Credit: VOLKER STEGER/SCIENCE PHOTO LIBRARY

Caption: Car air bag sensor. Coloured scanning electron micrograph (SEM) of the surface of a micro- accelerometer from a car's air bag. A pencil tip is shown for scale. The mauve squares are tiny pressure sensors which detect the rapid deceleration which occurs in a crash. They trigger a circuit which starts the rapid inflation of a plastic bag with air or nitrogen gas. The air bag deploys between the driver and the steering wheel in about one fifth of a second, preventing injury as the driver is thrown forward. Magnification: x10 at 7x4.5cm size.

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Keywords: accelerometer, air bag, air bag sensor, car, car safety, crash safety, mechanical, micro, micro-accelerometer, micromechanical, micromechanics, nano, nanotechnology, pencil, pressure sensor, safety systems, sem, sensor, technology

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