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.
|Number of pages||3|
|Publication status||Published - 1 Jan 1995|