Abstract

A dynamic interferometric system which can sequentially measure changes in an object at short intervals has been constructed. Holograms are recorded in a BSO crystal and the phase conjugated wave fronts are generated sequentially, so that only interferograms of changes in the adjoining intervals are obtained. From the detected interferogram the amount of change is calculated for the desired parameter and it is displayed on a CRT in 3-D. The construction of the device and some measurement results are given.

© 1983 Optical Society of America

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References

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  1. G. S. Ballard, J. Appl. Phys. 39, 4846 (1968).
    [CrossRef]
  2. J. P. Huignard, J. P. Herriau, Appl. Opt. 16, 1807 (1977).
    [CrossRef] [PubMed]
  3. T. Sato, T. Suzuki, P. J. Bryanston-Cross, O. Ikeda, T. Hatsuzawa, Appl. Opt. 22, 815 (1983).
    [CrossRef] [PubMed]

1983 (1)

1977 (1)

1968 (1)

G. S. Ballard, J. Appl. Phys. 39, 4846 (1968).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Dynamic interferometric measurement system. The operations of the three shutters S1, S2, and S3 are also shown: ATT, attenuator; L, lens; BS, beam splitter; and M, mirror.

Fig. 2
Fig. 2

Processing in the image processor in the measurement system, which transforms the fringe shifts in the observed interferogram from those in the basic interferogram into the phase change.

Fig. 3
Fig. 3

Experimental results for the moving air flow. (a) The basic fringe pattern of the system obtained when no object is in place, (b) and (c) observed dynamic interferograms, (d) and (e) 2-D distributions of the density change obtained from the interferograms (b) and (c), respectively, by comparison with the interferogram (a).

Fig. 4
Fig. 4

Experimental results for the convection of ethanol due to heating. The ethanol filled a transparent 10-mm thick cell and was heated from t = 0 sec to t = 4 sec. (a) Original fringes. (b)–(d) The sequentially observed dynamic interferograms, and (e)–(g) the corresponding 2-D distributions of the change in temperature over 2 sec.

Equations (5)

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h ( x , y ; t ) ( d / λ ) Δ n ( x , y ; t ) h 0 ,
Δ n ( x , y ; t ) = K Δ ρ ( x , y ; t ) ,
Δ ρ ( x , y ; t ) = ( λ / K d ) [ h ( x , y ; t ) / h 0 ] .
Δ n ( x , y ; t ) = A Δ T ( x , y ; t ) ,
Δ T ( x , y ; t ) = ( λ / A d ) [ h ( x , y ; t ) / h 0 ] .

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