Impact measuring device e.g. optical microphone, has semiconductor-laser diode that is arranged in proximity to optical lens and sends light beam, diaphragm that reflects part of light beam and photodiode that detects part of reflected beam

摘要

The device has an active semiconductor-laser diode (102) that is arranged in proximity to an optical lens (105) and sends light beam. A diaphragm (107) reflects a part of the light beam and is arranged in an optical path of the light beam. A photodiode (103) detects a part of the reflected light beam. The diaphragm has a thickness ranging between 0.1 micrometer and 20 micrometer, and is made of plastic. A control unit is arranged such that it operates the active laser diode in a laser mode. An independent claim is also included for a method for measuring impact.