Abstract

A multiplex technique is described that can be used in photoelectric observations of dispersed spectra. The encoding pattern is a set of pseudo-random binary sequences. The data processing requires a minimum possible number of operations. A special purpose device could give the spectral intensity distribution on-line. An application at the solar eclipse (Mexico, 1970) is described.

© 1970 Optical Society of America

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References

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  1. J. Houtgast, O. Namba, R. J. Rutten, Th. de Graauw, Nature 226, 1144 (1970).
    [CrossRef] [PubMed]
  2. N. J. A. Sloane, T. Fine, P. G. Phillips, M. Harwit, Appl. Opt. 8, 2103 (1969).
    [CrossRef] [PubMed]
  3. D. Everett, G. E. C. J. Sci. Technol., London 33, 115 (1966).
  4. P. A. N. Briggs, K. R. Godfrey, P. H. Hammond, IFAC Symp. on the Problems of Identification in Automatic Control Systems (Twente Inst. of Technology, Einchede, Netherlands, 1968), Vol. II, 3.10.
  5. B. P. Veltman, Proc. of the NATO Advanced Study Institute on Signal Processing with Emphasis on Underwater Acoustics (Enschede, Netherlands, 1968), 8.1.
  6. W. W. Peterson, Error Correcting Codes (Wiley, New York, 1966).

1970 (1)

J. Houtgast, O. Namba, R. J. Rutten, Th. de Graauw, Nature 226, 1144 (1970).
[CrossRef] [PubMed]

1969 (1)

1966 (1)

D. Everett, G. E. C. J. Sci. Technol., London 33, 115 (1966).

Briggs, P. A. N.

P. A. N. Briggs, K. R. Godfrey, P. H. Hammond, IFAC Symp. on the Problems of Identification in Automatic Control Systems (Twente Inst. of Technology, Einchede, Netherlands, 1968), Vol. II, 3.10.

de Graauw, Th.

J. Houtgast, O. Namba, R. J. Rutten, Th. de Graauw, Nature 226, 1144 (1970).
[CrossRef] [PubMed]

Everett, D.

D. Everett, G. E. C. J. Sci. Technol., London 33, 115 (1966).

Fine, T.

Godfrey, K. R.

P. A. N. Briggs, K. R. Godfrey, P. H. Hammond, IFAC Symp. on the Problems of Identification in Automatic Control Systems (Twente Inst. of Technology, Einchede, Netherlands, 1968), Vol. II, 3.10.

Hammond, P. H.

P. A. N. Briggs, K. R. Godfrey, P. H. Hammond, IFAC Symp. on the Problems of Identification in Automatic Control Systems (Twente Inst. of Technology, Einchede, Netherlands, 1968), Vol. II, 3.10.

Harwit, M.

Houtgast, J.

J. Houtgast, O. Namba, R. J. Rutten, Th. de Graauw, Nature 226, 1144 (1970).
[CrossRef] [PubMed]

Namba, O.

J. Houtgast, O. Namba, R. J. Rutten, Th. de Graauw, Nature 226, 1144 (1970).
[CrossRef] [PubMed]

Peterson, W. W.

W. W. Peterson, Error Correcting Codes (Wiley, New York, 1966).

Phillips, P. G.

Rutten, R. J.

J. Houtgast, O. Namba, R. J. Rutten, Th. de Graauw, Nature 226, 1144 (1970).
[CrossRef] [PubMed]

Sloane, N. J. A.

Veltman, B. P.

B. P. Veltman, Proc. of the NATO Advanced Study Institute on Signal Processing with Emphasis on Underwater Acoustics (Enschede, Netherlands, 1968), 8.1.

Appl. Opt. (1)

G. E. C. J. Sci. Technol., London (1)

D. Everett, G. E. C. J. Sci. Technol., London 33, 115 (1966).

Nature (1)

J. Houtgast, O. Namba, R. J. Rutten, Th. de Graauw, Nature 226, 1144 (1970).
[CrossRef] [PubMed]

Other (3)

P. A. N. Briggs, K. R. Godfrey, P. H. Hammond, IFAC Symp. on the Problems of Identification in Automatic Control Systems (Twente Inst. of Technology, Einchede, Netherlands, 1968), Vol. II, 3.10.

B. P. Veltman, Proc. of the NATO Advanced Study Institute on Signal Processing with Emphasis on Underwater Acoustics (Enschede, Netherlands, 1968), 8.1.

W. W. Peterson, Error Correcting Codes (Wiley, New York, 1966).

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Figures (6)

Fig. 1
Fig. 1

Autocorrelation function of a pseudo-random binary sequence of period N · Δt.

Fig. 2
Fig. 2

Cross correlation function between two the same pseudo-random binary sequences, one of them l · Δt shifted in time.

Fig. 3
Fig. 3

Block diagram for spectrum reconstruction.

Fig. 4
Fig. 4

Part of the encoding mask of 255 × 255 elements, which is seen by the second slit during four clock pulses. Full width is shown. Enlargement ≈5×. Dispersion direction is given by a. The motion of the mask is in direction b. The width of the second slit is given by d.

Fig. 5
Fig. 5

Shift register circuit for generation of a maximum length sequence with a period of fifteen clock pulses.

Fig. 6
Fig. 6

Fifteen-bit maximum length sequence generated by the system of Fig. 5.

Equations (1)

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φ i i ( τ ) = 1 N r = 1 N a ( r + τ ) a ( r ) ,

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