Abstract

A Comparator Microphotometer of new design is described. An optical system has been developed in which all of the available light flux is used for both viewing the spectrum and measuring the transmission of selected spectral lines. Besides high viewing screen intensity and great sensitivity, a unique electronic system is employed. The advantages of this null-ratio system include: reduced drift and noise, independence of individual vacuum tube characteristics, and freedom from the logarithmic damping response characteristic of galvanometers and meters.

© 1957 Optical Society of America

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References

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  1. K. Schwarzschild and W. Villiger, Astrophys. J. 23, 287 (1906).

1906 (1)

K. Schwarzschild and W. Villiger, Astrophys. J. 23, 287 (1906).

Schwarzschild, K.

K. Schwarzschild and W. Villiger, Astrophys. J. 23, 287 (1906).

Villiger, W.

K. Schwarzschild and W. Villiger, Astrophys. J. 23, 287 (1906).

Astrophys. J. (1)

K. Schwarzschild and W. Villiger, Astrophys. J. 23, 287 (1906).

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Figures (6)

Fig. 1
Fig. 1

The Jarrell-Ash Console Comparator Microphotometer.

Fig. 2
Fig. 2

Diagram of the measuring and projection optics.

Fig. 3
Fig. 3

Viewing screen.

Fig. 4
Fig. 4

Mechanical construction of the measuring optics.

Fig. 5
Fig. 5

Resolution of the “doublet” in the 3100 iron “triplet.”

Fig. 6
Fig. 6

Indicator servo-mechanism.