Abstract

The factors which limit the recording speed and the resolution of infra-red spectra are reviewed, and methods offering increased overall photometric efficiency are examined.

The attainment of greater efficiency by means of multi-slit arrangements is discussed and the experimental results are described.

© 1949 Optical Society of America

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Figures (4)

F. 1
F. 1

Block diagram of basic computer.

F. 2
F. 2

Block diagram of typical computer.

F. 3
F. 3

Rotating two-dimensionally patterned gratings mounted on infra-red spectrometer.

F. 4
F. 4

Tracing of ammonia spectrum record taken with rotating two-dimensionally patterned gratings. Wave number approximately 850 cm−1. Equivalent slit width 0.126 mm.

Tables (2)

Equations (2)

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0 1 f m ( t ) f n * ( t ) p ( t ) d t = δ m , n , δ m , n = 1 4 for m = n , δ m , n = 0 for m n ,
0 1 Σ m f m ( t ) f m + s * ( t ) sin 2 π t = 0 .