| 摘要 |
An anti-theft device 8 comprises an accelerometer unit 4, calculating means which may be a microprocessor unit 2 and an emitted medium which may be a charge of a pyrotechnic composition 9 containing a dyestuff 10. The microprocessor unit is programmed to use data from the accelerometer unit to calculate a distance travelled by the device from a rest position, and possibly the total acceleration experienced thereby. When the distance exceeds a preselected distance or when the total acceleration experienced exceeds a preset threshold limit, the microprocessor unit sets off the pyrotechnic composition. The device may be concealed within a bundle of real or imitation banknotes. The device may be activated when the accelerometer unit detects that the orientation of the device has changed by 45{ or more. The accelerometer may detect the orientation of the device with respect to a gravitational field. |
