Novel optical vibration sensor using external cavity feedback

Christine Mignosi, Roger P. Griffiths, Michal Bordovsky, Christopher N. Morgan, Ian H. White, Nicholas A J Lieven

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

A novel low cost, non-contact optical vibration sensor requiring only a single optoelectronic component has been developed. It consists of a CW semiconductor laser operating with external optical feedback. The laser beam reflected from a target generates a series of lasing modes set by the external cavity length. Beating of the modes produces an RF signal and this signal is detected as a variation in the junction voltage. Any change in the external cavity length induces corresponding beat frequency variations in the RF signal, which are transformed into amplitude variations using a simple edge-detection filter system. Using this sensor, low amplitude vibrations have been measured at frequencies of up to 600 Hz. Successful results have been achieved with target reflectivities lower than 5%. When calibrated, the sensor demonstrates satisfactory output for submicron vibration amplitudes. Maximum amplitudes of 1 mm have been measured with an accuracy of 0.2%.

Original languageEnglish
Pages (from-to)14-22
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3626
Publication statusPublished - 1 Jan 1999
EventProceedings of the 1999 Testing, Packaging, Reliability, and Applications of Semiconductor Lasers IV - San Jose, CA, USA
Duration: 28 Jan 199928 Jan 1999

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Mignosi, C., Griffiths, R. P., Bordovsky, M., Morgan, C. N., White, I. H., & Lieven, N. A. J. (1999). Novel optical vibration sensor using external cavity feedback. Proceedings of SPIE - The International Society for Optical Engineering, 3626, 14-22.

Novel optical vibration sensor using external cavity feedback. / Mignosi, Christine; Griffiths, Roger P.; Bordovsky, Michal; Morgan, Christopher N.; White, Ian H.; Lieven, Nicholas A J.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 3626, 01.01.1999, p. 14-22.

Research output: Contribution to journalConference article

Mignosi, C, Griffiths, RP, Bordovsky, M, Morgan, CN, White, IH & Lieven, NAJ 1999, 'Novel optical vibration sensor using external cavity feedback', Proceedings of SPIE - The International Society for Optical Engineering, vol. 3626, pp. 14-22.
Mignosi, Christine ; Griffiths, Roger P. ; Bordovsky, Michal ; Morgan, Christopher N. ; White, Ian H. ; Lieven, Nicholas A J. / Novel optical vibration sensor using external cavity feedback. In: Proceedings of SPIE - The International Society for Optical Engineering. 1999 ; Vol. 3626. pp. 14-22.
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