Abstract

An electromechanical shutter has been developed which will modulate the light flux from a variety of sources in response to an electrical input at frequencies up to 100 cps. Feedback assures a linearity of 0.6% and, in addition, maintains a constant output in spite of fluctuations in source intensity.

© 1965 Optical Society of America

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References

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  1. C. Enroth-Cugell and R. W. Jones, Science 134, 1884 (1961).
    [Crossref] [PubMed]
  2. H. Bornschein, Pflügers Archiv. 275, 478 (1962).
    [Crossref]
  3. H. Bornschein, Pflügers Archiv. 272, 582 (1961).
    [Crossref]
  4. H. Bornschein and R. Gunkel, Am. J. Ophthalmol. 42, 239 (1956).
    [PubMed]
  5. L. Ronchi and J. D. Moreland, Opt. Acta 4, 31 (1957).
    [Crossref]
  6. H. E. Ives, J. Opt. Soc. Am. 6, 254 (1922).
    [Crossref]
  7. H. de Lange, “Attenuation Characteristics and Phase-Shift Characteristics of the Human Fovea–Cortex Systems in Relation to Flicker-fusion Phenomena,” thesis, Rotterdam (1957).
  8. R. Carpenter, J. Opt. Soc. Am. 40, 225 (1950).
    [Crossref]
  9. “A Note on the Use of Glow Modulator Lamp for Studies of Vision,” Memorandum, Bell Laboratories (19October1960).
  10. J. J. van der Gon, J. Strackee, and L. H. van der Tweel, Phys. Med. Biol. 3, 164 (1958).
    [Crossref]
  11. Bausch & Lomb Optical Company, Rochester, New York, f/2.1, 3.5-in. E.F., 1.6-in. back focal length.

1962 (1)

H. Bornschein, Pflügers Archiv. 275, 478 (1962).
[Crossref]

1961 (2)

H. Bornschein, Pflügers Archiv. 272, 582 (1961).
[Crossref]

C. Enroth-Cugell and R. W. Jones, Science 134, 1884 (1961).
[Crossref] [PubMed]

1958 (1)

J. J. van der Gon, J. Strackee, and L. H. van der Tweel, Phys. Med. Biol. 3, 164 (1958).
[Crossref]

1957 (1)

L. Ronchi and J. D. Moreland, Opt. Acta 4, 31 (1957).
[Crossref]

1956 (1)

H. Bornschein and R. Gunkel, Am. J. Ophthalmol. 42, 239 (1956).
[PubMed]

1950 (1)

1922 (1)

Bornschein, H.

H. Bornschein, Pflügers Archiv. 275, 478 (1962).
[Crossref]

H. Bornschein, Pflügers Archiv. 272, 582 (1961).
[Crossref]

H. Bornschein and R. Gunkel, Am. J. Ophthalmol. 42, 239 (1956).
[PubMed]

Carpenter, R.

de Lange, H.

H. de Lange, “Attenuation Characteristics and Phase-Shift Characteristics of the Human Fovea–Cortex Systems in Relation to Flicker-fusion Phenomena,” thesis, Rotterdam (1957).

Enroth-Cugell, C.

C. Enroth-Cugell and R. W. Jones, Science 134, 1884 (1961).
[Crossref] [PubMed]

Gunkel, R.

H. Bornschein and R. Gunkel, Am. J. Ophthalmol. 42, 239 (1956).
[PubMed]

Ives, H. E.

Jones, R. W.

C. Enroth-Cugell and R. W. Jones, Science 134, 1884 (1961).
[Crossref] [PubMed]

Moreland, J. D.

L. Ronchi and J. D. Moreland, Opt. Acta 4, 31 (1957).
[Crossref]

Ronchi, L.

L. Ronchi and J. D. Moreland, Opt. Acta 4, 31 (1957).
[Crossref]

Strackee, J.

J. J. van der Gon, J. Strackee, and L. H. van der Tweel, Phys. Med. Biol. 3, 164 (1958).
[Crossref]

van der Gon, J. J.

J. J. van der Gon, J. Strackee, and L. H. van der Tweel, Phys. Med. Biol. 3, 164 (1958).
[Crossref]

van der Tweel, L. H.

J. J. van der Gon, J. Strackee, and L. H. van der Tweel, Phys. Med. Biol. 3, 164 (1958).
[Crossref]

Am. J. Ophthalmol. (1)

H. Bornschein and R. Gunkel, Am. J. Ophthalmol. 42, 239 (1956).
[PubMed]

J. Opt. Soc. Am. (2)

Opt. Acta (1)

L. Ronchi and J. D. Moreland, Opt. Acta 4, 31 (1957).
[Crossref]

Pflügers Archiv. (2)

H. Bornschein, Pflügers Archiv. 275, 478 (1962).
[Crossref]

H. Bornschein, Pflügers Archiv. 272, 582 (1961).
[Crossref]

Phys. Med. Biol. (1)

J. J. van der Gon, J. Strackee, and L. H. van der Tweel, Phys. Med. Biol. 3, 164 (1958).
[Crossref]

Science (1)

C. Enroth-Cugell and R. W. Jones, Science 134, 1884 (1961).
[Crossref] [PubMed]

Other (3)

Bausch & Lomb Optical Company, Rochester, New York, f/2.1, 3.5-in. E.F., 1.6-in. back focal length.

“A Note on the Use of Glow Modulator Lamp for Studies of Vision,” Memorandum, Bell Laboratories (19October1960).

H. de Lange, “Attenuation Characteristics and Phase-Shift Characteristics of the Human Fovea–Cortex Systems in Relation to Flicker-fusion Phenomena,” thesis, Rotterdam (1957).

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Figures (4)

Fig. 1
Fig. 1

Details of variable area aperture.

Fig. 2
Fig. 2

Block diagram of modulator.

Fig. 3
Fig. 3

Circuit diagram of light modulator. Power supply is Philbrick model R100-B.

Fig. 4
Fig. 4

(a) Illuminance output for 1-cps triangular wave input; range is 40:1. (b) Illuminance change for voltage step input; time scale, 1 msec/div.