Abstract

A comparison has been made between a calibrated thermopile and an argon ionization chamber as absolute detectors of radiant flux of wavelengths 584 Å and 735 Å. Corrections were applied to the data in order to account for the absorption due to gases in the monochromator, the energy carried away from the thermopile by photoejected electrons, nonuniformity of response across the surface of the thermopile, and uneven illumination of the thermopile by the flux from the monochromator. The two detectors were found to agree within the 3% estimated probable error in the measurements.

© 1967 Optical Society of America

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References

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  1. J. A. R. Samson, J. Opt. Soc. Am. 54, 6 (1964).
    [CrossRef]
  2. F. J. Matsunaga, R. S. Jackson, K. Watanabe, J. Quant. Spectry. Radiative Transfer 5, 329 (1965).
    [CrossRef]
  3. R. G. Johnston, R. P. Madden, Appl. Opt. 4, 1574 (1965).
    [CrossRef]

1965 (2)

F. J. Matsunaga, R. S. Jackson, K. Watanabe, J. Quant. Spectry. Radiative Transfer 5, 329 (1965).
[CrossRef]

R. G. Johnston, R. P. Madden, Appl. Opt. 4, 1574 (1965).
[CrossRef]

1964 (1)

Jackson, R. S.

F. J. Matsunaga, R. S. Jackson, K. Watanabe, J. Quant. Spectry. Radiative Transfer 5, 329 (1965).
[CrossRef]

Johnston, R. G.

Madden, R. P.

Matsunaga, F. J.

F. J. Matsunaga, R. S. Jackson, K. Watanabe, J. Quant. Spectry. Radiative Transfer 5, 329 (1965).
[CrossRef]

Samson, J. A. R.

Watanabe, K.

F. J. Matsunaga, R. S. Jackson, K. Watanabe, J. Quant. Spectry. Radiative Transfer 5, 329 (1965).
[CrossRef]

Appl. Opt. (1)

J. Opt. Soc. Am. (1)

J. Quant. Spectry. Radiative Transfer (1)

F. J. Matsunaga, R. S. Jackson, K. Watanabe, J. Quant. Spectry. Radiative Transfer 5, 329 (1965).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Schematic diagram of the apparatus used to compare the ionization chamber and thermopile as absolute detectors.

Fig. 2
Fig. 2

Schematic of detector chamber, showing thermopile and ion chamber modes of operation.

Fig. 3
Fig. 3

Sensitivity profile of the thermopile when kinematically mounted to the mask and scanned lengthwise across a narrow light beam.

Fig. 4
Fig. 4

Vertical intensity distribution of the 584-Å line. The ionization chamber was used as the detector and a horizontal slit scanned at the mask.

Tables (1)

Tables Icon

Table I Comparison of Absolute Flux Levels Measured by Ion Chamber and Thermopile

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