Abstract

A compact, large-aperture spectrograph utilizing commercially available optical components has been designed and constructed. Light is admitted through an adjustable bilateral slit and is collimated by a 300-mm f/4.5 telephoto camera lens. The dispersive element is a 102 × 102 mm, 600-lines per mm plane reflection grating with a first-order blaze at 1.0 μ. The spectrum is photographed with a single-lens reflex 35-mm camera equipped with a 75-mm f/1.5 lens. One frame covers a spectral range of approximately 8000 A with a dispersion of about 200 A/mm in the first order.

© 1959 Optical Society of America

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References

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  1. E. M. Reeves and R. W. Nicholls, J. Opt. Soc. Am. 48, 358 (1958).
    [Crossref]

1958 (1)

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Figures (6)

F. 1
F. 1

Schematic diagram of the arrangement of the optical components.

F. 2
F. 2

Top view of the assembled spectrograph with: A—base plate, B—8-in. diam housing, C—slit, D—collimator (telephoto) lens (f/4.5, 300 mm), E—grating in mount, F—camera lens (f/1.5, 75 mm) G—camera body.

F. 3
F. 3

House gas+oxygen flame (slightly fuel rich) showing the sodium D lines second order, 25-μ slit, microfile film; exposure 2 min (Hg 1/100 sec).

F. 4
F. 4

House gas+oxygen flame (slightly fuel rich) showing CH 4315-A band. Conditions as in Fig. 3; exposure 3 min.

F. 5
F. 5

House gas+oxygen flame (slightly fuel rich) showing C2 Swan bands at 5165 A and 5635 A. Conditions as in Fig. 3; exposure 30 sec.

F. 6
F. 6

Electrodeless discharge in nitrogen at 2-mm pressure. Second order, 25-μ slit, 103 a-F film, exposure 1 5 sec.

Tables (1)

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Table I Comparison of dispersions of several spectrographs.

Equations (6)

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sin α sin β = n λ / d
α β = 2 θ .
cos ( γ / 2 ) = n λ / 2 d sin θ .
θ sin 1 ( n λ / 2 d ) .
E = cos α / cos β = [ cos ( γ / 2 + θ ) ] / [ cos ( γ / 2 θ ) ] .
x = 1 2 ( D + d cos γ ) / sin γ .