Photography by Infrared: Its Principles and Applications

By Walter Clark | Go to book overview

PAINTS AND PIGMENTS. The infrared characteristics of a variety of paints and pigments are also described in Chapters VIII, XII, and XIII.

VARIOUS MATERIALS. Diffuse reflecting powers of various materials obtained by Coblentz10 are shown in Table XXXI.


TABLE XXXII
SNOW, SAND, ETC.
Wavelength
in A
Maine
Sand
Florida
Sand
Crushed
Quartz
SnowPlaster
of
Paris
White
Paper
Sodium
Carbon-
ate
Sodium
Chloride
White
Cotton
Cloth
3,000-4,000 8 15 40 35 40 8 14 38 36
4,000-8,000 25 40 50 40 53 30 28 49 42
8,000-26,000 33 50 53 15 60 30 35 54 40
26,000-70,000 31 30 28 18 63 15 18 55 20
70,000 48 . . . . 26 . . . . . . . . . .

These reflectivity data were published by Hulburt:40

Diffuse reflecting powers in relative units.

Maine sand, yellow-white, made up of grains of many colors from sea­ shore.

Florida sand, very white, containing quartz with some black specks, from two miles inland from sea.

Crushed quartz, made by grinding clear optical quartz in mortar.

Snow, untouched surface, freshly fallen.

Plaster of Paris, in powder form.

Paper, very slightly yellowish.

Sodium carbonate, anhydrous.

White cotton cloth, old cotton handkerchief, freshly washed and ironed.


BIBLIOGRAPHY

1. ASKANIA-WERKE A.-G., Siemens und A.-G Halske.

2. BARNES R. B., and BONNER L. G., "Filters for the Infrared," J. Optical Soc. Am., 1936, 26, 428-33.

3. "The Christiansen Filter Effect in the Infrared," Phys. Rev., 1936, 49, 732-40.

4. BAUSCHE AND LOMB OPTICAL CO., Colored Glass Filters, Rochester, N. Y., 1940.

5. BECKETT H. E., "The. Reflecting Powers of Rough Surfaces at Solar Wavelengths," Proc. Phys. Soc., 1931, 43, 227-41.

6. BERTLING H., "Gasentladungslampen als Dunkelkammerbeleuchtung, insbesondere bei Verarbeitung infrarotsensibilisierter Schichten," Phot. Ind., 1934, 32, 389-90, 415-17.

-440-

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