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Electronic Speckle Pattern

Interferometer (ESPI)

Model: HO-AE-ESP18
User-friendly graphical interfaces
Automated Goniometer tool for Variable Angle Spectroscopy

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.


Specifications

    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.



Features

    Measurement under visible light is possible

    Non contact and full field measurements

    Object contour and displacement measurements

Fig. Scematic Diagram

Scope of Supply


    Optical Breadboard with Vibration Isolation Support

Model No: ED-INT-15-BBVS
Material
:
Stainless Steel
Dimensions
:
1200 mm x 900 mm
Quantity
:
1 no.
Optical Breadboard with Vibration Isolation Support

    Spacial Filter Assembly

Model No: ED-INT-15-SFA
Magnification
:
60 X
Pinhole Size
:
5 micron
Quantity
:
1 no.
Spacial Filter Assembly

    Beamsplitter Mount

Model No: ED-INT-15-BSM
Material
:
Black anodized Aluminum alloy
AdjustmentRange
:
+/-4 degrees
Diameter
:
50 mm
Quantity
:
1 no.
Beamsplitter Mount

    Mirror Mount

Model No: ED-INT-15-MM
Material
:
Black anodized Aluminum alloy
AdjustmentRange
:
+/-4 degrees
Diameter
:
25 mm
Quantity
:
1 no.
Mirror Mount

    Test Object Mechanical Loader

Model No: ED-INT-15-TOML
Material
:
Black anodized Aluminium alloy
Loading
:
Linearly Micrometer controlled
Quantity
:
1 no.
Test Object Mechanical Loader

    Glass plate Holder with Mount

Model No: ED-INT-15-GHM
Material
:
Black anodized Aluminium alloy
Slot width
:
2 mm
Quantity
:
1 no.
Glass plate Holder with Mount

    Diffuser Mount

Model No: ED-INT-15-DM
Material
:
Black anodized Aluminium alloy
Slot width
:
3 mm
Quantity
:
1 no.
Diffuser Mount

    Polarizer Rotator with Mount

Model No: ED-INT-15-PRM
Material
:
Sheet polarizer
Rotation
:
360 degree
Resolution
:
1 degree
Quantity
:
1 no.
Polarizer Rotator with Mount

    Camera Lens Assembly with Mount

Model No: ED-INT-15-CLAM
Quantity
:
1 no.
Camera Lens Assembly with Mount

    Beamsplitter

Model No: ED-INT-15-BS
Dimension
:
50 mm x 50 mm
Thickness
:
4 mm
R/T ratio
:
50 / 50
Material
:
N-BK7
Coating
:
Aluminium
Quantity
:
1 no.


Beamsplitter

    Mirror with Cell Supply

Model No: ED-INT-15-MC
Diameter
:
25 mm
Thickness
:
6 mm
Material
:
Borofloat
Coating
:
Aluminium
Quantity
:
1 no.


Mirror with Cell

    Glass Plate

Model No: ED-INT-15-GP
Dimension
:
75 mm x 25 mm
Thickness
:
1 mm
Material
:
Float
Quantity
:
2 nos.
Glass Plate

    Diffuser Plate

Model No: ED-INT-15-DP
Dimension
:
50 mm x 50 mm
Thickness
:
2 mm
Material
:
Float
Quantity
:
2 nos.
Diffuser Plate

    Helium Neon Laser

Model No: ED-INT-15-HNL
Wave length
:
632.8nm
Optical power
:
5 mW
Quantity
:
2 nos.
Helium Neon Laser

    CCD Camera with Mount

Model No: ED-INT-15-CCDM
Resolution
:
Selectable(320-1280 pixels)
Connectivity
:
USB 2.0
Quantity
:
1 no.
CCD Camera with Mount

    Heater with Control Unit

Model No: ED-INT-15-HCU
Output Power
:
200 Watts
Quantity
:
1 no.
Heater with Control Unit

    Accessories

User Manual
Allen keys
Thumb Screws
Software CD

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