Reference Axis

55°

PHOTOCELLFOfl DETECTOR 2 \

*— PHOTOCELL FOR / DETECTOR t

Fig. 6-2. Orientation of Two Cosine Detectors To Provide Sun Angle Measurements Over a Wide Angular Range

Fig. 6-2. Orientation of Two Cosine Detectors To Provide Sun Angle Measurements Over a Wide Angular Range

each sensor; the solid line is the summed output

A second analog sensor type uses a bar or mask to shadow a portion of one or more photocells. Different configurations can yield a one-axis sensor (Fig. 6-4) or a two-axis sensor (Fig. 6-5) with varying FOVs and resolution. The two-axis sensor shown is similar to that flown on HEAO-1 [Gray, et al., 1976].

Fig. 6-4. One-Axis Mask Sun Detector [Koso and Kollodge, 1969]

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