Abstract

Instrumentation is described with which it is possible to determine the spectral distribution of rapidly varying infrared sources as a function of time.

A ten channel infrared spectrometer utilizing a multiple arrangement of Golay pneumatic detectors provides information for a ten channel electronic switch which presents this information on a single oscilloscope screen. Silver tube “wave guides” are used to conduct radiation passing through ten separate exit slits to the corresponding detectors. This equipment was developed in connection with a project sponsored by Evans Signal Laboratory, Signal Corps, Department of the Army, Belmar, N. J.

© 1951 Optical Society of America

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References

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  1. Bullock and Silverman, J. Opt. Soc. Am. 40, 608 (1950).
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1950 (1)

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Figures (9)

Fig. 1
Fig. 1

Optical system of infrared spectrograph (plan view). M1, M4, parabolic mirrors; M2, M3, plane mirrors; BS, beam splitting mirrors; P1, P2, NaCl prisms; S1, entrance slit; S2, exit slits; W, wave guides; PD, photo-thermal detectors; A, adjustable angle; O, pivot point for Wadsworth mounting and second prism; R, incoming radiation.

Fig. 2
Fig. 2

Beam splitting mirrors (elevation), P2, NaCl prism; BS, beam splitting mirrors; M3, plane mirrors; R, radiation.

Fig. 3
Fig. 3

Arrangement of exit slits and wave guides. (Scale: 2×.)

Fig. 4
Fig. 4

Arrangement of wave guides and detectors.

Fig. 5
Fig. 5

View of spectrograph showing prism tables and exit slits.

Fig. 6
Fig. 6

View of spectrograph showing beam splitter, large parabolic focusing mirror, and support for detectors.

Fig. 7
Fig. 7

Block diagram of electronic switch.

Fig. 8
Fig. 8

Methods of presenting information.

Fig. 9
Fig. 9

Typical oscilloscope trace.

Tables (1)

Tables Icon

Table I Relative intensity of various channels.