1. Carousel Interferometer for Metrological Applications
Ghazanfar Hussain
(Sensors Group, NILOP)
National Institute of Lasers and Optronics
4/30/2018

2. Carousel Interferometer for Metrological Applications
LASER
Mirror
Interference Fringes
Beamsplitter
4/30/2018

3. Carousel Interferometer for Metrological Applications
Prism
LASER
Interference Fringes
Beamsplitter
4/30/2018
National Institute of Lasers and Optronics, Islamabad

4. Carousel Interferometer for Metrological Applications
Metrology - Backbone of Manufacturing and Services Industries and hence Economy of a Country
Metrology of Optical and Mechanical Components and Systems
Dimensional Metrology
Thickness and Length Measurements
Angle Measurement
Axis of Rotation
Simultaneous Measurement of Angle and Axis of Rotation and Slip
Calibration of Gyroscopes and the Wheels
Vibration Detection
Calibration of Optical Sources
Optical Surface Characterization
Many Others
4/30/2018
National Institute of Lasers and Optronics, Islamabad

5. Carousel Interferometer for Metrological Applications
Two Right-angle Prism & Compensator Glass Plate Assembly
Rotation introduce Individual and Relative Optical Path Differences (OPDs) in the two Arms
One and Three Outputs in different Setups
Determines Angle and Axis of Rotation
Error in retrieved Angle and Axis of Rotation is in the Range
4/30/2018

6. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

7. National Institute of Lasers and Optronics
1 March 2010 / Vol. 49, No. 7 / APPLIED OPTICS
4/30/2018
National Institute of Lasers and Optronics

8. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

9. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics
Carousel Interferometer and it Metrological Applications

10. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

11. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

12. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

13. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics
Carousel Interferometer and it Metrological Applications

14. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

15. Carousel Interferometer for Metrological Applications
Optimized Parameters and Given Values
Given Parameters
λ = 632.8nm
no =
ns =
ψ = 15.5° to 15.6°
α = 0° to 360°
R1 = mm
Optimized Parameters
Δxo = mm
Δyo = mm
do = mm
4/30/2018
National Institute of Lasers and Optronics

16. Precision Measurement of Angle and Axis of Rotation
4/30/2018
National Institute of Lasers and Optronics

17. Precision Measurement of Angle and Axis of Rotation
4/30/2018
National Institute of Lasers and Optronics

18. Precision Measurement of Angle and Axis of Rotation
4/30/2018
National Institute of Lasers and Optronics

19. Precision Measurement of Angle and Axis of Rotation
Radius of Rotation and Error
Quantity
Actual Radius = mm
-15o
-10o
-5o 0o 5o
10o
15o
Radius (1.0e+003 ×)
Millimeter
NaN
Error in Radius (1.0e-004×)
4/30/2018
National Institute of Lasers and Optronics

20. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

21. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics
Carousel Interferometer and it Metrological Applications

22. Carousel Interferometer for Metrological Applications
Parallel Plate Carousel Interferometer
(OPTICS LETTERS / Vol. 29, No. 16 / August 15, 2004)
Compact
Rugged
Inherently Nonlinear
Optimization for Linearity
4/30/2018
National Institute of Lasers and Optronics
Carousel Interferometer and it Metrological Applications

23. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics
Carousel Interferometer and it Metrological Applications

24. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

25. Carousel Interferometer for Metrological Applications
Error from a straight line after optimizing the glass plate thickness.
4/30/2018
National Institute of Lasers and Optronics

26. Carousel Interferometer for Metrological Applications2β a3 θr a2 2β
M 4
M 2 a1 θ2 y M1
M 3
GP2 x
GP1
O(x,y) θ1 θ1 a4 BS α
Detection after Interference α
Incident Beam a5 M5 M6
4/30/2018
National Institute of Lasers and Optronics

27. Carousel Interferometer for Metrological Applications
Given Parameters λ
a1a3
a1a5
632.8х10-6 mm
200 mm
160 mm ns θ1
45ᴼ θ2
110ᴼ α
80ᴼ
4/30/2018

28. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

29. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

30. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

31. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

32. Carousel Interferometer for Metrological Applications
Figure 3. Plot of residual OPD at optimized value without glass plates as a function of angle of rotation; a, b, c, & d represent
rotation ranges of ±5ᴼ, ±10ᴼ, ±15ᴼ, and ±20ᴼ respectively.
4/30/2018
National Institute of Lasers and Optronics

33. Carousel Interferometer for Metrological Applications
Figure 4. Plot of residual OPD at optimized value with glass plate as a function of angle of rotation; a, b, c, & d represent
rotation ranges of ±5ᴼ, ±10ᴼ, ±15ᴼ, and ±20ᴼ respectively.
4/30/2018
National Institute of Lasers and Optronics

34. Carousel Interferometer for Metrological Applications
Range of rotation
Maximum residual OPD (fringes)
Maximum nonlinearity
Without glass plates
With glass plates
-5ᴼ to +5ᴼ 37
0.018
7.7 х10-4
5.40 х10-7
-10ᴼ to +10ᴼ
295
0.58
6.20 х10-3
8.53 х10-6
-15ᴼ to +15ᴼ
991
4.20
7.02 х10-3
4.18 х10-5
-20ᴼto +20ᴼ
2335
16.56
1.25 х10-2
1.26 х10-4
4/30/2018
National Institute of Lasers and Optronics

35. Carousel Interferometer for Metrological Applications
4/30/2018
National Institute of Lasers and Optronics

36. Carousel Interferometer for Metrological Applications
Simultaneous Measurement of Angle and Axis of Rotation while it Slips at the same time.
National Institute of Lasers and Optronics, Islamabad
4/30/2018

37. Simultaneous Measurement of Rotation of an Object and Rotation of its Axis
4/30/2018

38. Sagging of a Axially Symmetric Body
4/30/2018
Carousel Interferometer and it Metrological Applications

39. Carousel Interferometer and its Metrological Applications
4/30/2018
Carousel Interferometer for Metrological Applications
Future Challenging Directions
Detection by using Interferometry:
Continuous and Full Circle Rotation in either Direction (± 2n)
Eccentricity and Precession in the Axis of Rotation probably simultaneously
Design of Totally Linear Technique for Angle, Axis and Slip in Axis of Rotation
4/30/2018
National Institute of Lasers and Optronics