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Figures (4)

Fig. 1
Fig. 1

Reflectance spectra of kaolinite, montmorillonite, and alunite are markedly different in the 2.0-to-2.4-μm range of wavelengths shown here.

Fig. 2
Fig. 2

Dual optical trains provide electrical signals representing the reflectance of an unknown mineral at two different wavelengths. Electronic circuitry computes and displays the ratio of the two reflectances.

Fig. 3
Fig. 3

Petallike panels unfold from a central fixed section to create an inner reflector dish. This reflector uses only one ring of panels. For clarity, the transmitter/receiver tripod assembly is not shown.

Fig. 4
Fig. 4

Pressurized paraboloidal solar concentrator would have high concentration ratio and would be easy to maintain. Gas pressure forces the reflecting film into contact with the paraboloidal substrate.

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