| 摘要 |
PURPOSE:To grasp correctly the pickup time on the vibration mode by indicating the varying state on a time axis of a subject and the radiation timing of a laser beam on the same picture. CONSTITUTION:In a holography pickup device 10, the object illuminating light A of the beams from the laser light source 11 is radiated upon a subject 20 and the reflected ray thereof reaches a recording medium 14, while the reference light B is radiated to the recording medium 14 to record an interfence stripe on the medium 14. In a double-pulsed system, the holography pickup is pulsewise twise performed while the timing thereof is decided basing on the signals from a vibration detector 25. On a display picture of a cathode ray tube oscillograph device 31 the signals A obtainable from the vibration detector 25 is indicated on a time axis, while further the laser radiation is indicated like B1, B2 and C1, C2. B1 and B2 are the signals detected from the driving pulses of the laser light source, while C1 and C2 are the timing signals to detect and indicate the laser light through a photoelectric detector 2. |
