Nanometer-scale displacement sensing using self-mixing interferometry with a correlation-based signal processing technique

• Autorzy: Hast J. , Okkonen M. , Heikkinen H. , Krehut L. , Myllylä R.
• Języki publikacji: EN

Abstrakty

EN

A self-mixing interferometer is proposed to measure nanometre-scale optical path length changes in the interferometer's external cavity. As light source, the developed technique uses a blue emitting GaN laser diode. An external reflector, a silicon mirror, driven by a piezo nanopositioner is used to produce an interference signal which is detected with the monitor photodiode of the laser diode. Changing the optical path length of the external cavity introduces a phase difference to the interference signal. This phase difference is detected using a signal processing algorithm based on Pearson's correlation coefficient and cubic spline interpolation techniques. The results show that the average deviation between the measured and actual displacements of the silicon mirror is 3.1 nm in the 0-110 nm displacement range. Moreover, the measured displacements follow linearly the actual displacement of the silicon mirror. Finally, the paper considers the effects produced by the temperature and current stability of the laser diode as well as dispersion effects in the external cavity of the interferometer. These reduce the sensor's measurement accuracy especially in long-term measurements.

Słowa kluczowe

EN

self-mixing interferometry; laser diode; external cavity; Pearson's correlation coefficient; cubic spline interpolation

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2006
• Tom: Vol. 14, No. 2
• Strony: 129--134
• Opis fizyczny: Bibliogr. 16 poz., wykr.

Twórcy

autor

Hast J.

autor

Okkonen M.

autor

Heikkinen H.

autor

Krehut L.

autor

Myllylä R.

• Optoelectronicss and Measurement Techniques Laboratory, Infotech Oulu, University of Oulu, 90014 Oulu, Finland,

Bibliografia

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