Abstract

An optical multilayer detection array for ultrasonic measurements is presented. The probe comprises a dielectric interference filter structure that is evaporated onto a glass plate. An incident acoustic pressure signal deforms the layer system, and the induced modulation of the optical reflectance is determined by a simple optical detection scheme. The principle of measurement is demonstrated by a line scan through the focus of a broadband transducer and can be applied to rapid two-dimensional characterization of ultrasonic fields. The high temporal and spatial resolution of the measurements is combined with high sensitivity and durability of the probe, and, in contrast with fiber-tip multilayer hydrophones, the multilayer detection array provides signals that are not influenced by acoustic resonances and diffraction phenomena.

© 1999 Optical Society of America

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References

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  1. Ch. Koch, Ultrasonics 34, 687 (1996).
    [CrossRef]
  2. V. Wilkens and Ch. Koch, Ultrasonics 37, 45 (1999).
    [CrossRef]
  3. J. D. Hamilton and M. O’Donnell, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 45, 216 (1998).
    [CrossRef]
  4. F. S. Foster, L. K. Ryan, and D. H. Turnbull, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 38, 446 (1991).
    [CrossRef]
  5. Ch. Koch, G. Ludwig, and W. Molkenstruck, Ultrasonics 35, 297 (1997).
    [CrossRef]

1999

V. Wilkens and Ch. Koch, Ultrasonics 37, 45 (1999).
[CrossRef]

1998

J. D. Hamilton and M. O’Donnell, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 45, 216 (1998).
[CrossRef]

1997

Ch. Koch, G. Ludwig, and W. Molkenstruck, Ultrasonics 35, 297 (1997).
[CrossRef]

1996

Ch. Koch, Ultrasonics 34, 687 (1996).
[CrossRef]

1991

F. S. Foster, L. K. Ryan, and D. H. Turnbull, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 38, 446 (1991).
[CrossRef]

Foster, F. S.

F. S. Foster, L. K. Ryan, and D. H. Turnbull, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 38, 446 (1991).
[CrossRef]

Hamilton, J. D.

J. D. Hamilton and M. O’Donnell, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 45, 216 (1998).
[CrossRef]

Koch, Ch.

V. Wilkens and Ch. Koch, Ultrasonics 37, 45 (1999).
[CrossRef]

Ch. Koch, G. Ludwig, and W. Molkenstruck, Ultrasonics 35, 297 (1997).
[CrossRef]

Ch. Koch, Ultrasonics 34, 687 (1996).
[CrossRef]

Ludwig, G.

Ch. Koch, G. Ludwig, and W. Molkenstruck, Ultrasonics 35, 297 (1997).
[CrossRef]

Molkenstruck, W.

Ch. Koch, G. Ludwig, and W. Molkenstruck, Ultrasonics 35, 297 (1997).
[CrossRef]

O’Donnell, M.

J. D. Hamilton and M. O’Donnell, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 45, 216 (1998).
[CrossRef]

Ryan, L. K.

F. S. Foster, L. K. Ryan, and D. H. Turnbull, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 38, 446 (1991).
[CrossRef]

Turnbull, D. H.

F. S. Foster, L. K. Ryan, and D. H. Turnbull, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 38, 446 (1991).
[CrossRef]

Wilkens, V.

V. Wilkens and Ch. Koch, Ultrasonics 37, 45 (1999).
[CrossRef]

IEEE Trans. Ultrason. Ferroelectr. Freq. Control

J. D. Hamilton and M. O’Donnell, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 45, 216 (1998).
[CrossRef]

F. S. Foster, L. K. Ryan, and D. H. Turnbull, IEEE Trans. Ultrason. Ferroelectr. Freq. Control 38, 446 (1991).
[CrossRef]

Ultrasonics

Ch. Koch, G. Ludwig, and W. Molkenstruck, Ultrasonics 35, 297 (1997).
[CrossRef]

Ch. Koch, Ultrasonics 34, 687 (1996).
[CrossRef]

V. Wilkens and Ch. Koch, Ultrasonics 37, 45 (1999).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Experimental setup for ultrasonic pressure measurement with a multilayer detection array and (inset) a magnified schematic of the multilayer structure: LD, laser diode; ISO, optical isolator; BS, beam splitter; PD, photodiode; A, transimpedance amplifier; SCOPE, oscilloscope; OSM, optical scanning mechanism; BBT, broadband transducer; PG, pulse generator; H’s, high-index λ/4 layers; L’s, low-index λ/4 layers.

Fig. 2
Fig. 2

Acoustic pressure p versus time t, measured with the multilayer detection array, a polyvinylidene fluoride membrane hydrophone, and a fiber-optic multilayer hydrophone.

Fig. 3
Fig. 3

Line scan in the focal plane of the transducer: normalized pressure signal p/pmax versus time t at different positions x.

Fig. 4
Fig. 4

Optical arrangement for the parallel acquisition of the spatial ultrasound pressure field: PDA, photo-diode array; MLA, microlens array; other abbreviations as in Fig. 1.

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