Optical fiber interferometry for photoacoustic spectroscopy in liquids

D. P. Hand, S. Freeborn, P. Hodgson, Tom Carolan, K. M. Quan, H. A. MacKenzie, J. D C Jones

Research output: Contribution to journalArticle

Abstract

This paper presents the development of an optical fiber photoacoustic detector having a small-sized, sensitive and remote broadband probe which is calibrated absolutely and has all the properties of required for quantitative spectroscopic information, without the acoustic impedance-matching problems displayed by contact type transducers. The instrument also measures spectrally resolved displacement fields. A pressure sensitivity of 0.1 Pa/vHz is observed, and an increase in pressure by a factor of 3.5 is obtained in an elliptical cell used for focusing the photoacoustic waves. The calibration was validated by comparative measurements with a miniature piezoelectric hydrophone. Application of the fiber detection technique for measurement of oil in water concentrations, glucose in blood, and defect concentrations in semiconductor materials are proposed.

Original languageEnglish
Pages (from-to)213-215
Number of pages3
JournalOptics Letters
Volume20
Issue number2
Publication statusPublished - 1 Jan 1995

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    Hand, D. P., Freeborn, S., Hodgson, P., Carolan, T., Quan, K. M., MacKenzie, H. A., & Jones, J. D. C. (1995). Optical fiber interferometry for photoacoustic spectroscopy in liquids. Optics Letters, 20(2), 213-215.