videostroboscope

The observation and measurement of fast events is typically done with expensive high speed cameras. At periodic events a flashing strobe light can be used alternatively to visualize the motion. The expression Videostroboskopy origins from the diagnostic research of vocal cords. Here the movement of voting lips is observed with camera, endiscope and stroboscopic illumination.

Out innovative system is based on the precise synchronization of a digital camera with the periodoc event. The illumination is done with time constant LED lights. The synchronization of the digital camera requires a periodic voltage signal (COLA) from the test unit (frequency generator, shaker, rotation encoder, etc.) Our mikroprocessor controller trigger unit (PhaseTriggerLS) analyses the input  signal (Frequency, phase) and generates a precisely phase synchronised trigger signal for the camera. The vibration frequency can be much faster (factor x1000) than the recording rate of the digital camera.

Example: If the camera records with max. 30Hz and the vibration frequenc is 100Hz then the trigger nit generates a trigger signal for the camera every 3rd. period. The following diagramm demonstrates the temporal order of events:

The triggering with constant phase relation to the input signal frezes the motion of the object in the camera image ("still image"):
Phasentrigger

Videostroboskop still image 

 

The triggering with temporal varied phase (phase sweep) shows the object movement in slow motion. The sweep velocity can be varied
Phasensweep
 videostroboskop phase sweep


Our light sensitive, low noise and high resolution industrial cameras show more image details in contrast to a high speed camera.