Abstract

A dual beam bidirectional reflectance attachment, which permits the sample plane to be tilted to plus or minus 45°, is described. No restriction is placed on the type of sample which can be investigated because the incident light impinges on the sample from above. Reflectance spectra of a variety of materials are shown, as well as an indicatrix for a specular and a diffuse reflector. The use of this attachment provides spectra of the kind necessary for interpreting terrestrial and planetary remote sensing data.

© 1967 Optical Society of America

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References

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  1. June issue of Appl. Opt. 5(1966) featuring Aerial Reconnaissance.
  2. Instruction Manual for Cary Recording Spectrophotometer Model 14. Applied Physics Corp., Monrovia, Calif.
  3. R. N. Colwell et al., Photogrammetric Engr. 19, 761 (1963).

1966

June issue of Appl. Opt. 5(1966) featuring Aerial Reconnaissance.

1963

R. N. Colwell et al., Photogrammetric Engr. 19, 761 (1963).

Colwell, R. N.

R. N. Colwell et al., Photogrammetric Engr. 19, 761 (1963).

Appl. Opt.

June issue of Appl. Opt. 5(1966) featuring Aerial Reconnaissance.

Photogrammetric Engr.

R. N. Colwell et al., Photogrammetric Engr. 19, 761 (1963).

Other

Instruction Manual for Cary Recording Spectrophotometer Model 14. Applied Physics Corp., Monrovia, Calif.

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Figures (4)

Fig. 1
Fig. 1

Bidirectional reflectance attachment for Cary 14 spectrophotometer.

Fig. 2
Fig. 2

Optical diagram in three orthogonal views.

Fig. 3
Fig. 3

Bidirectional reflectance spectra of various sample types recorded at 0° surface tilt. (a) Limonite spectra vs MgO (1) 0–5 μ, (2) 0–74 μ, (3) 74–250 μ, (4) unpolished (sawed plate), (5) 250–1200 μ, (6) poorly polished plate vs aluminum mirror. (b) Fresh vegetation spectra vs MgO. (1) coarse grass, (2) clover, (3) pine needles. (c) Other materials vs MgO (1) weathered lava, (2) pumice, (3) moist humus soil, (4) unweathered lava.

Fig. 4
Fig. 4

Indicatrices of (1) aluminum mirror, (2) MgO at 0.60 μ. Curve (3) is a cosine θ curve included for comparison.

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