Simultaneous two-dimensional endoscopic pulsed digital holography for evaluation of dynamic displacements.
An endoscope is used in pulsed digital holography to simultaneously evaluate in-plane and out- of-plane transient and harmonic displacements on a flat metallic plate. The plate is illuminated from two different directions. The optical path for each illumination direction is matched to its corresponding reference beam, but also in such a way that each object-reference beam pair optical path is mismatched such that they are incoherent and can be stored in a single CCD frame. As is typical in these types of interferometric arrangement, two digital holograms are needed to compare two different states of the plate. Each hologram is Fourier transformed and due to the incoherence introduced, two separate spectra are readily identified, each belonging to an object-reference beam pair. On comparing by subtraction the phase obtained from the two pulsed digital holograms, it is possible to gather quantitative in-plane and out-of- plane results from transient and harmonic displacements.
Saucedo A
Tonatiuh
T
Centro de Investigaciones en Optica, A.C., Loma del Bosque, Mexico. tsaucedo@cio.mx
Santoyo
Fernando Mendoza
FM
De la Torre Ibarra
Manuel
M
Pedrini
Giancarlo
G
Osten
Wolfgang
W
D019723:Endoscopes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D006696:Holography / Q000295:instrumentation* / Q000379:methods; D007089:Image Enhancement / Q000295:instrumentation*; D007834:Lasers; D009038:Motion; D019047:Phantoms, Imaging; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D018511:Systems Integration