I�ve done holography (before there were systems) they do have some limitations.
As the Newton rings (the white and dark interference bands) represent one wavelength of the light source, typically 632nm (nanometers) there is a limit to being able to measure very large displacements. Primarily these systems are used for non-destructive tests in �hard� objects like metal skins, seals and tires. (you can inflate a tire � add a small additional amount of air and see an bulges forming from weaknesses in the structure without actually inflating the tire to failure) They look at aircraft by pressurize the fuselage and looking for bulges or deformities which are only a few tens of microns to find minute weaknesses in the structure. If the muscle is moving on the several to tens of millimeters range � or moving very rapidly � the system will be unable to count the changes (rings). Also the object needs to be pretty stationary relative to the light source and camera. I would consult the company suggested and see what they have to say. An interesting solution though. Jack Hamilton Hamilton Design [EMAIL PROTECTED] www.Labuseful.com 714-839-6375 Office
