Airbags used in the Mars Exploration Rover mission must be strong enough to cushion the spacecraft if it lands on rocks or rough terrain, while allowing it to bounce across Mars' surface at freeway speeds after landing. To add to the complexity, the airbags must inflate seconds before touchdown and deflate once the craft is safely on the ground.
Miniature cable-type displacement sensors developed by SpaceAge Control, a sensor supplier that manufactures miniature, ruggedized alternatives to LVDTs and linear potentiometers, were used to test the airbag performance to ensure the airbag compressive stroke did not exceed its design requirements. The flexible displacement cable made for an easier installation process requiring no special fixturing.