Abstract

A type of visible-absorbing, infra-red transmitting filter is described in which the absorbing units are produced from a plastic film that also serves as a supporting medium. Filters of this kind prepared from polyvinyl chloride and polyvinylidene chloride films are characterized by transmission bands between 1 and 3.3μ and between 3.5 and 5.8μ. Ways of isolating either of these bands are described. Such filters have obvious utility in connection with photoconductive cells.

© 1950 Optical Society of America

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References

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  1. E. R. Blout, W. F. Amon, R. G. Shepherd, A. Thomas, C. D. West, and E. H. Land, J. Opt. Soc. Am. 36, 460 (1946).
    [Crossref] [PubMed]
  2. J. H. Shenk, E. S. Hodge, R. J. Morris, E. E. Pickett, and W. R. Brode, J. Opt. Soc. Am. 36, 569 (1946).
    [Crossref] [PubMed]
  3. A. H. Pfund, Phys. Rev. 36, 71 (1930).
    [Crossref]
  4. R. L. Tousey and D. E. Mitchell, J. Opt. Soc. Am. 36, 362 (1946).

1946 (3)

1930 (1)

A. H. Pfund, Phys. Rev. 36, 71 (1930).
[Crossref]

Amon, W. F.

Blout, E. R.

Brode, W. R.

Hodge, E. S.

Land, E. H.

Mitchell, D. E.

R. L. Tousey and D. E. Mitchell, J. Opt. Soc. Am. 36, 362 (1946).

Morris, R. J.

Pfund, A. H.

A. H. Pfund, Phys. Rev. 36, 71 (1930).
[Crossref]

Pickett, E. E.

Shenk, J. H.

Shepherd, R. G.

Thomas, A.

Tousey, R. L.

R. L. Tousey and D. E. Mitchell, J. Opt. Soc. Am. 36, 362 (1946).

West, C. D.

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Figures (9)

Fig. 1
Fig. 1

Reactions of polyvinyl chloride and polyvinylidene chloride.

Fig. 2
Fig. 2

Spectra of polyvinyl chloride and dehydrohalogenated polyvinyl chloride films.

Fig. 3
Fig. 3

Spectra of polyvinylidene chloride and dehydrohalogenated polyvinylidene chloride films.

Fig. 4
Fig. 4

Spectrum of glass-laminated dehydrohalogenated polyvinyl chloride filter.

Fig. 5
Fig. 5

Spectrum of dehydrohalogenated polyvinyl chloride with magnesium oxide fumed on surface.

Fig. 6
Fig. 6

Spectra of zinc oxides and dehydrohalogenated polyvinyl chloride showing effect of particle size.

Fig. 7
Fig. 7

Extent of dehydrohalogenation of polyvinyl chloride as measured by KNIR shown as a function of time of heating. Circles indicate experimental points.

Fig. 8
Fig. 8

Near-infra-red transmission of various samples of dehydrohalogenated polyvinyl chloride showing effect of variation of extent of reaction on transmission.

Fig. 9
Fig. 9

Equipment used in preparation of filters and in measurement of KNIR. (A) Closely coiled tungsten filament source. (B) Iris diaphragm (to adjust zero). (C) Condensing lens. (D) Temperature-controlled oven, with Pyrex glass end plates, in which reaction occurs. (E) RCA No. 922 photo-tube covered with Wratten No. 87 filter. (F) Sample holder. (G) Voltmeter which reads KNIR directly.