Interferometry
This device is similar to Newton's Rings apparatus, except that an arrangement for loading the test piece is provided for carrying out Cornus interference studies. The objective of this experiment is to determine Poisson's ratio and Young's Modulus for different materials (glass, Perspex etc) using interference method. Weights are positioned at both ends of the bar, causing it to bend longitudinally downward. A glass plate is placed on the bar to produce an interference pattern. By examining the interference pattern, extent of longitudinal and lateral bending can be determined. Thus, Poisson ratio and Young's modulus of the bar can be deduced.
When a plano-convex lens rests on a uniformly bent glass bar, an air film is formed between the two surfaces. Without adding any mass in the weight hanger we get circular rings. But as we uniformly add mass on the weight hangers, the beam bends and we get elliptical fringes.
Experiment
To study the elastic constants of glass by Cornus interference methods,
i. Hyperbolic fringes
When a rectangular glass plate rests on a uniformly bent glass beam, an air film is formed between the two glass surfaces. On illuminating the air film with monochromatic light, two conjugate systems of hyperbolic fringes (longitudinal and transverse) around the point of contact of the glass plates are obtained.
By measuring the longitudinal and transverse curvature, Young’s modulus (Y) and Poisson’s ratio (σ) can be determined.
ii. Elliptical fringes
When a plano-convex lens rests on a uniformly bent glass bar, an air film is formed between the two surfaces. On illuminating the air film with monochromatic light, a system of elliptical fringes (longitudinal and transverse) around the point of contact of the glass bar is obtained.
By measuring the longitudinal and transverse curvature, Young’s modulus (Y) and Poisson’s ratio (σ) can be determined.
Scope of Supply
Model No: ED-INT-02-TMRB
Magnification : 30 x
Micrometer Travel : 25 mm
Least Count : 0.01 mm
Quantity : 1 no.
Model No: ED-INT-02-KERB
Height : 180 mm
Material : Anodized Aluminum Alloy & SS
Quantity : 1 no.
Model No: ED-INT-02-LEDM
Height : 225 mm
Material : Anodized Aluminum Alloy & SS
Quantity : 1 no.
Model No: ED-INT-02-WHC
Length : 5 mm
Material : Anodized Aluminium Alloy
Quantity : 2 nos.
Model No: ED-INT-02-WHW
Material : Brass
Weights : 100 gm & 50 gm
Quantity : 2 Sets each
Model No: ED-INT-02-PCL1000
Material : Borofloat
Diameter : 50 mm
Focal Length : 1000 mm
Quantity : 1 no.
Model No: ED-INT-02-PCL750
Material : Borofloat
Diameter : 50 mm
Focal Length : 750 mm
Quantity : 1 no.
Model No: ED-INT-02-OF
Material : Borofloat
Diameter : 50 mm
Quantity : 1 no.
Model No: ED-INT-02-BSP
Material : Borofloat
Diameter : 45 x 45 mm
Quantity : 1 no.
Model No: ED-INT-02-SLPS
Output Power : 35 W
Quantity : 1 no.
Model No: ED-INT-02-LEDP
Colours : Red, Blue, Green, Yellow
Output : 5V, 800 mA
Quantity : 1 no. each
Model No: ED-INT-02-TS
Material : Borofloat glass, PMMA
Diameter : 300 x 40 x 2 mm
Quantity : 1 no. each
Dust Protective cover
Instruction Manual
Established in 1993, Holmarc Opto-Mechatronics Ltd manufactures variety of scientific and engineering instruments for research, industry and education.
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