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Dispersive Comb-Spectrum Interferometer:

Dispersive Comb-Spectrum Interferometer:. Metrological Characterization. Wiroj Sudatham 48430402 Industrial Metrology Program KMUTT. 17/01/2006. Umberto Minoni, Luigi Rovati, M. Bonardi, and Franco Docchio (Owner).

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Dispersive Comb-Spectrum Interferometer:

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  1. Dispersive Comb-Spectrum Interferometer: Metrological Characterization Wiroj Sudatham 48430402 Industrial Metrology Program KMUTT 17/01/2006 Umberto Minoni, Luigi Rovati, M. Bonardi, and Franco Docchio (Owner) IEEE TRANSACTION ON INSTRUMENTATION AND MEASUREMENT, VOL. 48, NO. 6, DECEMBER 1999

  2. Objective & Scope • Modeling tools for nonincremental distance measurement • Low-cost implementation, using a commercial low-cost laser diode • Analytical uncertainty sources • Application for the development industrial sensors • Introduction toDSCI • Principle of measurement • Analytical of uncertainty sources • Experimental Results Seminar – S. Wiroj DSCI - Introduction

  3. Introduction Interferometer • Tools, widely used in nonincremental distance measurement • Many type (difference component) • Interference of light waves • Principle of superposition • Coherence light source • Light Sources (normally used laser) Seminar – S. Wiroj DSCI - Introduction

  4. Introduction Dispersive Comb Spectrum Interferometer - DCSI • Michelson’s Interferometer System • White Light (LD 670 nm) • Diffraction Grating • Littrow Configuration Seminar – S. Wiroj DSCI - Introduction

  5. Introduction Why DCSI ? • Easy to optical setup and mechanical moving parts • Robust and reliable configurations • high-accuracy • Using a commercial low cost laser diode as the light source Seminar – S. Wiroj DSCI - Introduction

  6. MM Principle Of Measurement Measurement Setup RM LD MM BS1 CCD CC TC BS2 L1 L2 Littrow Configuration DG Seminar – S. Wiroj DSCI – Principle Of Measurement

  7. Principle Of Measurement • The CCD Camera for the spectral component detection and transfer to computer • Littrow configuration exhibits adequate spectral resolution to study interference phenomena of each lasing modes Seminar – S. Wiroj DSCI – Principle Of Measurement

  8. Principle Of Measurement • Signal processing The interference signal before sampling Simulated signal at the output of the camera • The sampling frequency is given by the spectral frequency of the lasing modes • The distance to be measured S can be evaluated by gauging the period Tcos Seminar – S. Wiroj DSCI – Principle Of Measurement

  9. Light source and its controls • Line width of each lasing modes • The value of center frequency • Optical setup including the detection of the interference signal • Drift from the diffraction grating • Drift from the CCD detection Uncertainty Sources Two main cases Seminar – S. Wiroj DSCI – Uncertainty Sources

  10. not be easily calculated mapping optical freq onto the time scale of the camera signal Uncertainty Sources Uncertainty Model Where, Assuming a negligible change of air refractive index Seminar – S. Wiroj DSCI – Uncertainty Sources

  11. The best condition • Operating at 43 mA • Temperature in the range from 8 oC to 14 oC Experiment Results Laser Characterization Seminar – S. Wiroj DSCI – Experiment Results

  12. Fringes visibility Experiment Results Laser Characterization • if not, no aliasing phenomena are present • The range of measurement should be • Experiment result Seminar – S. Wiroj DSCI – Experiment Results

  13. = Uncertainty Components = Data be used The combined uncertainty of the measuring range 800 mm corresponding to about 1.4 mm Experimental Results Numerical Case • A numerical estimate of the measurement uncertainty • Used data from prototype implementation and • Laser source characterization Seminar – S. Wiroj DSCI – Experiment Results

  14. Operating at 8 oC • 42 mA • Environment 22 oC • SD of error is 1.3 mm Experiment Results Distance Measurements • Calibration a implementation of the system with • interferometer traced to international standard • The sensitivity to l0 , that the laser has a temperature coefficient of 0.39 nm/oC Seminar – S. Wiroj DSCI – Experiment Results

  15. Conclusion • Supportable both theory and experimental results • Suitable to carry out measurement over up to about 1 mm • Uncertainty of 0.18% • Low-cost commercial source • Application for the development of industrial sensors. Seminar – S. Wiroj DSCI – Conclusion

  16. THE END. Presentation by S. Wiroj Dispersive Come-Spectrum Interferometer: Metrological Characterization AND THANK YOU FOR ATTENTION. Umberto Minoni, Luigi Rovati, M. Bonardi, and Franco Docchio (Owner) IEEE TRANSACTION ON INSTRUMENTATION AND MEASUREMENT, VOL. 48, NO. 6, DECEMBER 1999

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