Abstract

A design is presented for a double-beam infra-red analyzer that utilizes the chopped-light principle. The advantages of this instrument are low rate of drift at high sensitivities, freedom from the effects of ambient temperatures, and general ruggedness, all of which make the system adaptable to plant analytical and control problems. The receiving system consists of a thermistor bolometer and tuned amplifier. Performance data are given for the butadiene recycle impurity system of a GR-S synthetic rubber plant stream.

© 1948 Optical Society of America

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References

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  1. H. Schmick, U. S. Patent No. 1,758,088.
  2. N. Wright and L. W. Hercher, J. Opt. Soc. Am. 36, 198 (1946).
  3. W. G. Fastie and A. H. Pfund, J. Opt. Soc. Am. 37, 762 (1947).
    [CrossRef] [PubMed]
  4. National Bureau of Standards, June14, 1946.
  5. C. E. Mendenhall, Astrophys. J. 33, 91 (1911).
    [CrossRef]
  6. A. G. Worthing, Phys. Rev. 25, 846 (1925).
    [CrossRef]
  7. W. H. Brattain and J. A. Becker, “Thermistor bolometers,” presented at the Winter Meeting of the Optical Society of America, March 7–9, 1946, Cleveland, Ohio.
  8. L. W. Gildart, “An investigation of the comparative merits of the Thermistor-a.c. amplifier system and the thermocouple-galvanometer system,” Final report submitted by E. F. Barker, Technical Representative, N.D.R.C. Contract OEMsr-1132, University of Michigan, Ann Arbor, Michigan—PB 27342.

1947 (1)

1946 (1)

N. Wright and L. W. Hercher, J. Opt. Soc. Am. 36, 198 (1946).

1925 (1)

A. G. Worthing, Phys. Rev. 25, 846 (1925).
[CrossRef]

1911 (1)

C. E. Mendenhall, Astrophys. J. 33, 91 (1911).
[CrossRef]

Becker, J. A.

W. H. Brattain and J. A. Becker, “Thermistor bolometers,” presented at the Winter Meeting of the Optical Society of America, March 7–9, 1946, Cleveland, Ohio.

Brattain, W. H.

W. H. Brattain and J. A. Becker, “Thermistor bolometers,” presented at the Winter Meeting of the Optical Society of America, March 7–9, 1946, Cleveland, Ohio.

Fastie, W. G.

Gildart, L. W.

L. W. Gildart, “An investigation of the comparative merits of the Thermistor-a.c. amplifier system and the thermocouple-galvanometer system,” Final report submitted by E. F. Barker, Technical Representative, N.D.R.C. Contract OEMsr-1132, University of Michigan, Ann Arbor, Michigan—PB 27342.

Hercher, L. W.

N. Wright and L. W. Hercher, J. Opt. Soc. Am. 36, 198 (1946).

Mendenhall, C. E.

C. E. Mendenhall, Astrophys. J. 33, 91 (1911).
[CrossRef]

Pfund, A. H.

Schmick, H.

H. Schmick, U. S. Patent No. 1,758,088.

Worthing, A. G.

A. G. Worthing, Phys. Rev. 25, 846 (1925).
[CrossRef]

Wright, N.

N. Wright and L. W. Hercher, J. Opt. Soc. Am. 36, 198 (1946).

Astrophys. J. (1)

C. E. Mendenhall, Astrophys. J. 33, 91 (1911).
[CrossRef]

J. Opt. Soc. Am. (2)

N. Wright and L. W. Hercher, J. Opt. Soc. Am. 36, 198 (1946).

W. G. Fastie and A. H. Pfund, J. Opt. Soc. Am. 37, 762 (1947).
[CrossRef] [PubMed]

Phys. Rev. (1)

A. G. Worthing, Phys. Rev. 25, 846 (1925).
[CrossRef]

Other (4)

W. H. Brattain and J. A. Becker, “Thermistor bolometers,” presented at the Winter Meeting of the Optical Society of America, March 7–9, 1946, Cleveland, Ohio.

L. W. Gildart, “An investigation of the comparative merits of the Thermistor-a.c. amplifier system and the thermocouple-galvanometer system,” Final report submitted by E. F. Barker, Technical Representative, N.D.R.C. Contract OEMsr-1132, University of Michigan, Ann Arbor, Michigan—PB 27342.

National Bureau of Standards, June14, 1946.

H. Schmick, U. S. Patent No. 1,758,088.

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Figures (7)

Fig. 1
Fig. 1

Typical cell arrangements and the corresponding calibration curves.

Fig. 2
Fig. 2

Optical system of infra-red double-beam analyzer.

Fig. 3
Fig. 3

Over-all view of analyzer with top removed.

Fig. 4
Fig. 4

Band pass characteristic curve of the tuned amplifier.

Fig. 5
Fig. 5

Equivalent bolometer circuit.

Fig. 6
Fig. 6

Showing the relationship between average source temperature and the sensitivity (silver chloride windows).

Fig. 7
Fig. 7

Typical recorder charts of sensitivity drift studies.

Tables (1)

Tables Icon

Table I Comparison of silver chloride and quartz cell windows.* Source temperature 960°K.