Abstract

An automatic slit drive has been constructed for a single-beam infrared spectrometer, using two helical potentiometers in a servosystem. The output of generator potentiometer is heavily loaded causing its output voltage function to curve sharply with displacement. This reduces the number of taps per prism to two. Evaluation of circuit parameters is described, and values are listed for prisms of calcium fluoride, sodium chloride, potassium bromide, and cesium bromide, used in double pass. A simple modification permits selection of several different energy levels. The resulting curves of spectrometer output vs frequency are constant.

© 1960 Optical Society of America

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References

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  1. W. E. Tolberg and H. M. Boyd, Anal. Chem. 24, 1836–9 (1952).
    [Crossref]
  2. W. Doner, Electronics 28, 136–41 (1955).
  3. M. D. Liston and J. U. White, J. Opt. Soc. Am. 40, 36–41 (1950).
    [Crossref]
  4. Greenwood, Holdam, and MacRae, Electronic Instruments (McGraw-Hill Book Company, Inc., New York, 1948), p. 95.

1955 (1)

W. Doner, Electronics 28, 136–41 (1955).

1952 (1)

W. E. Tolberg and H. M. Boyd, Anal. Chem. 24, 1836–9 (1952).
[Crossref]

1950 (1)

Boyd, H. M.

W. E. Tolberg and H. M. Boyd, Anal. Chem. 24, 1836–9 (1952).
[Crossref]

Doner, W.

W. Doner, Electronics 28, 136–41 (1955).

Greenwood,

Greenwood, Holdam, and MacRae, Electronic Instruments (McGraw-Hill Book Company, Inc., New York, 1948), p. 95.

Holdam,

Greenwood, Holdam, and MacRae, Electronic Instruments (McGraw-Hill Book Company, Inc., New York, 1948), p. 95.

Liston, M. D.

MacRae,

Greenwood, Holdam, and MacRae, Electronic Instruments (McGraw-Hill Book Company, Inc., New York, 1948), p. 95.

Tolberg, W. E.

W. E. Tolberg and H. M. Boyd, Anal. Chem. 24, 1836–9 (1952).
[Crossref]

White, J. U.

Anal. Chem. (1)

W. E. Tolberg and H. M. Boyd, Anal. Chem. 24, 1836–9 (1952).
[Crossref]

Electronics (1)

W. Doner, Electronics 28, 136–41 (1955).

J. Opt. Soc. Am. (1)

Other (1)

Greenwood, Holdam, and MacRae, Electronic Instruments (McGraw-Hill Book Company, Inc., New York, 1948), p. 95.

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Figures (3)

Fig. 1
Fig. 1

Slit-width necessary to maintain constant output energy vs drum position for prisms of CaF2, NaCl, and KBr used in a Perkin-Elmer single-beam double-pass monochromator with Globar source.

Fig. 2
Fig. 2

Circuit diagram; see text for explanation of symbols.

Fig. 3
Fig. 3

Relative output energy vs frequency, using the final working model of the slit-drive. Energy increases in downward direction (see text).

Tables (1)

Tables Icon

Table I Optimum values of circuit parameters for the various prisms. The units of H are “drum turns”; see text and Fig. 2 for K, U, and C.

Equations (4)

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E a E a = K ( α + U ) K ( U + 1 ) + ( α + U ) ( 1 - α ) ;             E b E b = β + C C + 1 .
E a = E b ,
β + C C + 1 = K ( α + U ) K ( U + 1 ) + ( α + U ) ( 1 - α ) · E a E b .
C + S / D 1 + C = K [ 1 + U + ( T 0 - T ) / H ] K ( 1 + U ) - [ U - 1 + ( T 0 - T ) / H ] [ ( T 0 - T ) / H ] · E a E b .