Abstract

The Photoelectric Rotating Slit Elevation and Azimuth Sensor (perseas) measures the azimuth and elevation of the line of sight to a target reflecting or emitting radiation in the 0.4- to 1.1-μ portion of the spectrum. Angular field of view is 360° in azimuth and 30° in elevation. Eight stationary lenses are used with rotating fiber-optics slits and silicon photodiode detectors to produce electrical pulses which are time related to target angular coordinates. Data rate is one line-of-sight measurement per 2.5 msec. Accuracy is better than 1 mrad.

© 1966 Optical Society of America

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Figures (11)

Fig. 1
Fig. 1

perseas.

Fig. 2
Fig. 2

perseas optical system.

Fig. 3
Fig. 3

Rotating drum.

Fig. 4
Fig. 4

Fiber slits.

Fig. 5
Fig. 5

Fiber optics plate.

Fig. 6
Fig. 6

Diagram of lens, data frame, and sync slit orientation.

Fig. 7
Fig. 7

Geometrical diagram from which the azimuth equation is derived.

Fig. 8
Fig. 8

Slit configuration.

Fig. 9
Fig. 9

Spectral response of RCA 20–4–25–2.0 photodiode.

Fig. 10
Fig. 10

Amplifier output signals for different data frames and light levels.

Fig. 11
Fig. 11

Various waveforms using (a) moon and (b) Xenon lamp (orange = 4127 cm) as targets.

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