Abstract

A description is given of a mobile laboratory equipped with two spectrographs for radiance measurements of the sky and terrain between 1 and 20 μ. The laboratory has its own ac power supply and means for controlling its temperature. Procedures are described for calibrating the instrumentation and transforming the data into spectral radiance (in microwatts cm−2 steradian−1 micron−1) as a function of wavelength.

© 1960 Optical Society of America

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References

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  1. References to literature reporting instrumentation used by and data obtained by other researchers are included in the two other papers in this series, one of which is found elsewhere in this issue: E. Bell, L. Eisner, J. Young, and R. Oetjen, J. Opt. Soc. Am. 50, 1313 (1960).
    [Crossref]
  2. G. Hass and C. D. Salzberg, J. Opt. Soc. Am. 44, 181 (1954).
    [Crossref]

1960 (1)

1954 (1)

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Figures (4)

Fig. 1
Fig. 1

Shortwave Perkin-Elmer spectrographic system. The Saran cover encloses the base of the periscope but has been drawn away to give a clearer view of the optical components in front of the spectrograph.

Fig. 2
Fig. 2

Longwave Farrand spectrographic system showing the recorder and some of the controls.

Fig. 3
Fig. 3

View of the truck used as the mobile laboratory. Periscope tubes are directed near the zenith of the sky. Visual observation of the sky is afforded by the plastic dome seen between the periscopes.

Fig. 4
Fig. 4

Curves illustrating the steps used in transforming recorded deflections into spectral radiance.

Equations (9)

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[ N 473 ρ 4 + N m ( 1 - ρ ) ρ 3 + N m ( 1 - ρ ) ρ 2 + N m ( 1 - ρ ) ρ + N m ( 1 - ρ ) ] - [ N 310 ρ 3 + N m ( 1 - ρ ) ρ 2 + N m ( 1 - ρ ) ρ + N m ( 1 - ρ ) ] = K D h o ,
N 473 ρ 4 + N m ( 1 - ρ ) ρ 3 - N 310 ρ 3 = K D h o .
N 310 ρ 4 + N m ( 1 - ρ ) ρ 3 - N 473 ρ 3 = K D h i .
ρ = ( D h o - D h i ) N m + ( D h i N 310 - D h o N 473 ) D h i ( N 473 - N m ) - D h o ( N 310 - N m ) .
N S = K D S ρ 4 + N 310 ρ - N m ( 1 - ρ ) ρ .
ρ 2 = N 310 D h i - N 473 D h o ( N 473 D h i - N 310 D h o ) .
N 1160 - N 310 ρ = K D 1160
N S = K D S ρ 3 + N 310 ρ 2 - N m ( 1 - ρ 2 ) ρ 2 .
N S = K D S + N r e f ,