Abstract

A new porous glass optical fiber has been developed for use as a sensor for the detection of ammonia vapors at low concentrations. The porous structure that remains after selective heat treatment, phase separation, and chemical leaching of a borosilicate glass imparts a high surface area to the fiber core. Ammonia vapors permeating into the porous zone, which is pretreated with a reversible pH dye indicator, produce a spectral change in transmission. The resulting pH change is measured by in-line optical absorbance and is proportional to the ambient-ammonia concentration. Ammonia-vapor concentrations as low as 0.7 part in 106 have been detected.

© 1988 Optical Society of America

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References

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  1. M. Maseini, C. Cremisini, Anal. Chim. Acta 92, 277 (1977).
    [CrossRef]
  2. W. N. Opdycke, S. J. Parks, M. E. Meyerhoff, Anal. Chim. Acta 155, 11 (1983).
    [CrossRef]
  3. Y. Fraticelli, M. E. Meyerhoff, Anal. Chem. 53, 992 (1981).
    [CrossRef]
  4. D. J. David, M. C. Wilson, D. S. Ruffin, Anal. Lett. 9, 38 (1976).
    [CrossRef]
  5. T. A. Orofino, D. J. Dand, E. E. Hardy, presented at the Fourth Joint Conference on Sensing Environmental Pollutants, New Orleans, La., 1977.
  6. J. F. Giuliani, H. Wohltjen, N. L. Jarvis, Opt. Lett. 8, 54 (1983).
    [CrossRef] [PubMed]

1983 (2)

W. N. Opdycke, S. J. Parks, M. E. Meyerhoff, Anal. Chim. Acta 155, 11 (1983).
[CrossRef]

J. F. Giuliani, H. Wohltjen, N. L. Jarvis, Opt. Lett. 8, 54 (1983).
[CrossRef] [PubMed]

1981 (1)

Y. Fraticelli, M. E. Meyerhoff, Anal. Chem. 53, 992 (1981).
[CrossRef]

1977 (1)

M. Maseini, C. Cremisini, Anal. Chim. Acta 92, 277 (1977).
[CrossRef]

1976 (1)

D. J. David, M. C. Wilson, D. S. Ruffin, Anal. Lett. 9, 38 (1976).
[CrossRef]

Cremisini, C.

M. Maseini, C. Cremisini, Anal. Chim. Acta 92, 277 (1977).
[CrossRef]

Dand, D. J.

T. A. Orofino, D. J. Dand, E. E. Hardy, presented at the Fourth Joint Conference on Sensing Environmental Pollutants, New Orleans, La., 1977.

David, D. J.

D. J. David, M. C. Wilson, D. S. Ruffin, Anal. Lett. 9, 38 (1976).
[CrossRef]

Fraticelli, Y.

Y. Fraticelli, M. E. Meyerhoff, Anal. Chem. 53, 992 (1981).
[CrossRef]

Giuliani, J. F.

Hardy, E. E.

T. A. Orofino, D. J. Dand, E. E. Hardy, presented at the Fourth Joint Conference on Sensing Environmental Pollutants, New Orleans, La., 1977.

Jarvis, N. L.

Maseini, M.

M. Maseini, C. Cremisini, Anal. Chim. Acta 92, 277 (1977).
[CrossRef]

Meyerhoff, M. E.

W. N. Opdycke, S. J. Parks, M. E. Meyerhoff, Anal. Chim. Acta 155, 11 (1983).
[CrossRef]

Y. Fraticelli, M. E. Meyerhoff, Anal. Chem. 53, 992 (1981).
[CrossRef]

Opdycke, W. N.

W. N. Opdycke, S. J. Parks, M. E. Meyerhoff, Anal. Chim. Acta 155, 11 (1983).
[CrossRef]

Orofino, T. A.

T. A. Orofino, D. J. Dand, E. E. Hardy, presented at the Fourth Joint Conference on Sensing Environmental Pollutants, New Orleans, La., 1977.

Parks, S. J.

W. N. Opdycke, S. J. Parks, M. E. Meyerhoff, Anal. Chim. Acta 155, 11 (1983).
[CrossRef]

Ruffin, D. S.

D. J. David, M. C. Wilson, D. S. Ruffin, Anal. Lett. 9, 38 (1976).
[CrossRef]

Wilson, M. C.

D. J. David, M. C. Wilson, D. S. Ruffin, Anal. Lett. 9, 38 (1976).
[CrossRef]

Wohltjen, H.

Anal. Chem. (1)

Y. Fraticelli, M. E. Meyerhoff, Anal. Chem. 53, 992 (1981).
[CrossRef]

Anal. Chim. Acta (2)

M. Maseini, C. Cremisini, Anal. Chim. Acta 92, 277 (1977).
[CrossRef]

W. N. Opdycke, S. J. Parks, M. E. Meyerhoff, Anal. Chim. Acta 155, 11 (1983).
[CrossRef]

Anal. Lett. (1)

D. J. David, M. C. Wilson, D. S. Ruffin, Anal. Lett. 9, 38 (1976).
[CrossRef]

Opt. Lett. (1)

Other (1)

T. A. Orofino, D. J. Dand, E. E. Hardy, presented at the Fourth Joint Conference on Sensing Environmental Pollutants, New Orleans, La., 1977.

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Figures (5)

Fig. 1
Fig. 1

SEM’s of a fractured surface of a porous fiber.

Fig. 2
Fig. 2

Absorption spectra of the diluted dye in water before (A) and after (B) the addition of ammonia hydroxide.

Fig. 3
Fig. 3

Schematic diagram of optical sensor evaluation system.

Fig. 4
Fig. 4

Typical porous sensor response curves at different ammonia concentrations.

Fig. 5
Fig. 5

Equilibrium absorbance versus ammonia concentration calibration curve for the porous fiber sensor.

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