Abstract

A mechanical device is described that performs automatically the laborious task of reducing a microphotometer spectrum trace to a spectral intensity curve. In performing the conversion the microphotometer trace, divided into sections, is contact printed onto sensitized material using a narrow slit light source and moving the trace and photographic material at different rates of speed past the slit. The slit is parallel to the wavelength axis and, in effect, scans along the density axis. The photographic material moves at constant speed, while the motion of the trace is controlled by a cam whose shape is essentially the photographic characteristic curve. The density curve is converted to a curve of log intensity in one step, and a second step is used to convert to linear intensity. Other uses of the device are suggested.

© 1954 Optical Society of America

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References

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  1. C. S. Beals, J. Roy. Astron. Soc. Can. 38, 65 (1944).
  2. Weissler, Einarsson, and McClelland, Rev. Sci. Instr. 23, 209 (1952).
    [Crossref]
  3. R. C. Williams and A. Hiltner, Publ. Am. Astron. Soc. 10, 33 (1939).
  4. M. Minnaert and J. Houtgast, Z. Astrophys. 15, 354 (1938).
  5. W. N. Brown and W. B. Birtley, Rev. Sci. Instr. 22, 67 (1951).
    [Crossref]
  6. Wilson, Tousey, Purcell, Johnson, and Moore, Astrophys. J. 119, 590 (1954).
    [Crossref]
  7. Johnson, Purcell, and Tousey, J. Geophys. Research 56, 583 (1951).
    [Crossref]

1954 (1)

Wilson, Tousey, Purcell, Johnson, and Moore, Astrophys. J. 119, 590 (1954).
[Crossref]

1952 (1)

Weissler, Einarsson, and McClelland, Rev. Sci. Instr. 23, 209 (1952).
[Crossref]

1951 (2)

W. N. Brown and W. B. Birtley, Rev. Sci. Instr. 22, 67 (1951).
[Crossref]

Johnson, Purcell, and Tousey, J. Geophys. Research 56, 583 (1951).
[Crossref]

1944 (1)

C. S. Beals, J. Roy. Astron. Soc. Can. 38, 65 (1944).

1939 (1)

R. C. Williams and A. Hiltner, Publ. Am. Astron. Soc. 10, 33 (1939).

1938 (1)

M. Minnaert and J. Houtgast, Z. Astrophys. 15, 354 (1938).

Beals, C. S.

C. S. Beals, J. Roy. Astron. Soc. Can. 38, 65 (1944).

Birtley, W. B.

W. N. Brown and W. B. Birtley, Rev. Sci. Instr. 22, 67 (1951).
[Crossref]

Brown, W. N.

W. N. Brown and W. B. Birtley, Rev. Sci. Instr. 22, 67 (1951).
[Crossref]

Einarsson,

Weissler, Einarsson, and McClelland, Rev. Sci. Instr. 23, 209 (1952).
[Crossref]

Hiltner, A.

R. C. Williams and A. Hiltner, Publ. Am. Astron. Soc. 10, 33 (1939).

Houtgast, J.

M. Minnaert and J. Houtgast, Z. Astrophys. 15, 354 (1938).

Johnson,

Wilson, Tousey, Purcell, Johnson, and Moore, Astrophys. J. 119, 590 (1954).
[Crossref]

Johnson, Purcell, and Tousey, J. Geophys. Research 56, 583 (1951).
[Crossref]

McClelland,

Weissler, Einarsson, and McClelland, Rev. Sci. Instr. 23, 209 (1952).
[Crossref]

Minnaert, M.

M. Minnaert and J. Houtgast, Z. Astrophys. 15, 354 (1938).

Moore,

Wilson, Tousey, Purcell, Johnson, and Moore, Astrophys. J. 119, 590 (1954).
[Crossref]

Purcell,

Wilson, Tousey, Purcell, Johnson, and Moore, Astrophys. J. 119, 590 (1954).
[Crossref]

Johnson, Purcell, and Tousey, J. Geophys. Research 56, 583 (1951).
[Crossref]

Tousey,

Wilson, Tousey, Purcell, Johnson, and Moore, Astrophys. J. 119, 590 (1954).
[Crossref]

Johnson, Purcell, and Tousey, J. Geophys. Research 56, 583 (1951).
[Crossref]

Weissler,

Weissler, Einarsson, and McClelland, Rev. Sci. Instr. 23, 209 (1952).
[Crossref]

Williams, R. C.

R. C. Williams and A. Hiltner, Publ. Am. Astron. Soc. 10, 33 (1939).

Wilson,

Wilson, Tousey, Purcell, Johnson, and Moore, Astrophys. J. 119, 590 (1954).
[Crossref]

Astrophys. J. (1)

Wilson, Tousey, Purcell, Johnson, and Moore, Astrophys. J. 119, 590 (1954).
[Crossref]

J. Geophys. Research (1)

Johnson, Purcell, and Tousey, J. Geophys. Research 56, 583 (1951).
[Crossref]

J. Roy. Astron. Soc. Can. (1)

C. S. Beals, J. Roy. Astron. Soc. Can. 38, 65 (1944).

Publ. Am. Astron. Soc. (1)

R. C. Williams and A. Hiltner, Publ. Am. Astron. Soc. 10, 33 (1939).

Rev. Sci. Instr. (2)

Weissler, Einarsson, and McClelland, Rev. Sci. Instr. 23, 209 (1952).
[Crossref]

W. N. Brown and W. B. Birtley, Rev. Sci. Instr. 22, 67 (1951).
[Crossref]

Z. Astrophys. (1)

M. Minnaert and J. Houtgast, Z. Astrophys. 15, 354 (1938).

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Figures (5)

F. 1
F. 1

Layout of instrument for converting microphotometer traces to curves of intensity.

F. 2
F. 2

The cams for converting from density to log intensity.

F. 3
F. 3

The cams for converting from log intensity to linear intensity.

F. 4
F. 4

A sample trace of the solar ultraviolet spectrum, together with the log intensity and linear intensity traces produced by means of the instrument.

F. 5
F. 5

A modified form of the instrument for introducing spectral attenuation into a spectrum. The attenuation function described by cam G is added to the logarithmic spectral intensity trace.

Equations (1)

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log 10 I = log 10 I 0 K λ p .