PIV measurements in IC engines, turbo machinery or pumps usually require the manufacturing of expensive prototypes with large glass windows. Endoscopic PIV utilises endoscopes for the camera and the laser so that a small hole is the only access needed.

The noticable field curvature caused by an endoscope is automatically corrected for by software.
Camera and laser endoscopes for visible and UV range are applied in order to study combustion and flow field phenomina with minmum optical access under real machine conditions.