Electronic Speckle Pattern interferometry (ESPI) is a non-destructive optical method for studying surface deformations. It relies on the interference between diffusely reflected light from the test object and a reference beam.
This is one of the most sensitive interferometric technique, so that we can measure sub-micron level displacements either in plane or out of plane. The images before and after deformation are recorded by a CCD camera and analysed using an image analysis software. Deformation causes variations in the fringe pattern.These variations can be analized with the help of the software provided to find the deformations.
As this interferometer is highly sensitive to vibrational noises, Holmarc's ESPI comes with a Vibration isolation optical breadboard. A linearly polarized 632.8nm He-Ne laser with 5mW output power is used as the light source. A beam splitter splits the laser beam into two. The transmitted beam illuminates the test object uniformly via a spatial filter assembly while the reflected beam falls on a CCD as reference beam. The image of the illuminated test object is captured by zoom lens and CCD.
Our ESPI system allows the user to perform the Electronic Speckle Shearographic interferometry in the same system without disturbing the optical set ups and alignments. Holmarc’s camera application software helps to capture and analyze the images.
Laser : He-Ne 5mW @ 632.8nm.
Beam expander : 20X microscope objective with pinhole.
Zoom lens : Nikon®
Camera : 1/2.5“ 5 MPC MOS Color
Software : Holmarc camera application software & image analysis software.
Optical Breadboard : 1200mm x 900 mm size with vibration isolation support.
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Product warranty: Our warranty for all our mechanical components and systems are ONE year from the date of shipment. Repair or replacement will be made free of charge for products with defects in material and workmanship during this period. For our optical components, our warranty is 30 days from the date of shipment. Defective items will be replaced free of cost. The customer must notify any defect in optical components within 48 hours of receipt. For all warranty replacement, a written statement with an authorized signature indicating the reason for rejection attaching test reports are requested to accompany the returned parts. All defective items must be returned in their original shipping container within 10 days of the date of shipment.
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