Abstract

An infra-red spectrometer employing interchangeable 60°-prisms with faces 10 by 15 cm of potassium bromide, sodium chloride, and lithium fluoride in Wadsworth-Littrow mounting is briefly described. A one-meter 10° off-axis paraboloid is used for collimation. The radiation passing through the exit slit is focused on the thermocouple receiver by means of an ellipsoidal mirror with foci at distances 42 and 6 cm. The entrance slit has two sets of curved jaws, one set for the LiF prism and another for the NaCl and KBr prisms. When prisms are changed by push-button control the proper entrance slit automatically moves into position. The position of sharp bands can be determined to within ±0.005 micron at 5μ and ±0.002 micron at 10μ. The correction for stray radiation is less than 1 percent of full scale deflection below 13μ. With the potassium bromide prism, and lithium fluoride shutter, the correction for stray radiation is 5 percent of total deflection at 15μ and 10 percent at 18μ. When a sodium chloride shutter is used beyond 18μ the correction for stray radiation is negligible. The construction and performance of the instrument are illustrated by nine figures.

© 1947 Optical Society of America

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References

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Figures (9)

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