Moiré interferometry with single normal incident beam——Moiré camera & moiré microscope

The background of the moiré interferometry with single normal incident beam is based upon the Fouries optical analysis of the relation between inclined and normal incident beam on a zero thickness grating. The new optical-path system not only carries forward the traditional advantages as well as the same sensitivity and the same wave-front interference but also the simplifying and compacting optical-path can collect total necessary components together from laser source to CCD imager system in an apparatus. Since the moiré tests don't need to work on the holographic platform in dark room with a lot of separated components. The designed moiré camera (f=300～2400 lines/mm) and moiré microscope (f=12000 lines/mm or sensitivity=83.3 nm/lines) accomplish the instrumentalize of moiré tests. As stated in the final section, the grating just like a fine scale for measurement of deformation. However, the scale can't measure an object with same order of magnitude because the deformed information of all the higher frequencies would be transformed into decaying waves arrested by the grating. According to the recent data concerned, the nanon grating and UV moiré will be a powerful tool for the research of micro fracture mechanics in the new century.