Abstract

This paper explains in a simple manner the mechanism of formation of pressure pulse inside a pneumatic detector due to incident ir radiation. The detector had been designed earlier at Trombay. Experimentally observed characteristics of the detector have been explained on the basis of the theory derived.

© 1978 Optical Society of America

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References

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  1. K. G. Vohra, R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, “A Condenser Microphone ir Detector for Use in Single Tube ir Gas Analyzer for Health and Safety Surveys,” Paper presented in the First Asian Regional Congress on Radiation Protection, Bombay (15–20 December 1974).
  2. D. P. Lucero, J. Phys. E 6, 281 (1973).
    [CrossRef]
  3. W. B. Brugel, An Introduction to Infrared Spectroscopy (Methuen, London, 1957).
  4. L. E. Kinsler, A. R. Frey, Fundamentals of Acoustics (Wiley, New York, 1964).
  5. S. Glasstone, Thermodynamics for Chemists (Van Nostrand, Princeton, N.J., 1964).
  6. P. Campani, C. S. Fang, H. W. Prengle, Appl. Spectrosc. 26, 372 (1972).
    [CrossRef]
  7. R. N. Sachdev, K. K. Rajan, A micro-barograph, BARC/AM/42, Bhabha Atomic Research Centre, Trombay Report (1968).
  8. R. N. Sachdev, J. Geophys. Res. 47, 5413 (1969).
    [CrossRef]
  9. R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, K. G. Vohra, Some Investigations on the Use of Infrared Technique for Gas Analysis, BARC I-463, Bhabha Atomic Research Centre, Trombay Report (1977).
  10. D. W. Hill, T. Powell, J. Sci. Instrum. 44, 731 (1967).
    [CrossRef]
  11. R. N. Sachdev, J. P. Gupta, K. G. Vohra, Chem. Eng. World 11, 53 (1976).
  12. L.-G. Rosengren, Appl. Opt. 14, 1960 (1975).
    [CrossRef] [PubMed]

1976

R. N. Sachdev, J. P. Gupta, K. G. Vohra, Chem. Eng. World 11, 53 (1976).

1975

1973

D. P. Lucero, J. Phys. E 6, 281 (1973).
[CrossRef]

1972

1969

R. N. Sachdev, J. Geophys. Res. 47, 5413 (1969).
[CrossRef]

1967

D. W. Hill, T. Powell, J. Sci. Instrum. 44, 731 (1967).
[CrossRef]

Brugel, W. B.

W. B. Brugel, An Introduction to Infrared Spectroscopy (Methuen, London, 1957).

Campani, P.

Fang, C. S.

Frey, A. R.

L. E. Kinsler, A. R. Frey, Fundamentals of Acoustics (Wiley, New York, 1964).

Glasstone, S.

S. Glasstone, Thermodynamics for Chemists (Van Nostrand, Princeton, N.J., 1964).

Gupta, J. P.

R. N. Sachdev, J. P. Gupta, K. G. Vohra, Chem. Eng. World 11, 53 (1976).

R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, K. G. Vohra, Some Investigations on the Use of Infrared Technique for Gas Analysis, BARC I-463, Bhabha Atomic Research Centre, Trombay Report (1977).

K. G. Vohra, R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, “A Condenser Microphone ir Detector for Use in Single Tube ir Gas Analyzer for Health and Safety Surveys,” Paper presented in the First Asian Regional Congress on Radiation Protection, Bombay (15–20 December 1974).

Hill, D. W.

D. W. Hill, T. Powell, J. Sci. Instrum. 44, 731 (1967).
[CrossRef]

Kinsler, L. E.

L. E. Kinsler, A. R. Frey, Fundamentals of Acoustics (Wiley, New York, 1964).

Lucero, D. P.

D. P. Lucero, J. Phys. E 6, 281 (1973).
[CrossRef]

Powell, T.

D. W. Hill, T. Powell, J. Sci. Instrum. 44, 731 (1967).
[CrossRef]

Prengle, H. W.

Rajan, K. K.

K. G. Vohra, R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, “A Condenser Microphone ir Detector for Use in Single Tube ir Gas Analyzer for Health and Safety Surveys,” Paper presented in the First Asian Regional Congress on Radiation Protection, Bombay (15–20 December 1974).

R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, K. G. Vohra, Some Investigations on the Use of Infrared Technique for Gas Analysis, BARC I-463, Bhabha Atomic Research Centre, Trombay Report (1977).

R. N. Sachdev, K. K. Rajan, A micro-barograph, BARC/AM/42, Bhabha Atomic Research Centre, Trombay Report (1968).

Rosengren, L.-G.

Sachdev, R. N.

R. N. Sachdev, J. P. Gupta, K. G. Vohra, Chem. Eng. World 11, 53 (1976).

R. N. Sachdev, J. Geophys. Res. 47, 5413 (1969).
[CrossRef]

R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, K. G. Vohra, Some Investigations on the Use of Infrared Technique for Gas Analysis, BARC I-463, Bhabha Atomic Research Centre, Trombay Report (1977).

R. N. Sachdev, K. K. Rajan, A micro-barograph, BARC/AM/42, Bhabha Atomic Research Centre, Trombay Report (1968).

K. G. Vohra, R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, “A Condenser Microphone ir Detector for Use in Single Tube ir Gas Analyzer for Health and Safety Surveys,” Paper presented in the First Asian Regional Congress on Radiation Protection, Bombay (15–20 December 1974).

Swarup, G.

K. G. Vohra, R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, “A Condenser Microphone ir Detector for Use in Single Tube ir Gas Analyzer for Health and Safety Surveys,” Paper presented in the First Asian Regional Congress on Radiation Protection, Bombay (15–20 December 1974).

R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, K. G. Vohra, Some Investigations on the Use of Infrared Technique for Gas Analysis, BARC I-463, Bhabha Atomic Research Centre, Trombay Report (1977).

Vohra, K. G.

R. N. Sachdev, J. P. Gupta, K. G. Vohra, Chem. Eng. World 11, 53 (1976).

R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, K. G. Vohra, Some Investigations on the Use of Infrared Technique for Gas Analysis, BARC I-463, Bhabha Atomic Research Centre, Trombay Report (1977).

K. G. Vohra, R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, “A Condenser Microphone ir Detector for Use in Single Tube ir Gas Analyzer for Health and Safety Surveys,” Paper presented in the First Asian Regional Congress on Radiation Protection, Bombay (15–20 December 1974).

Appl. Opt.

Appl. Spectrosc.

Chem. Eng. World

R. N. Sachdev, J. P. Gupta, K. G. Vohra, Chem. Eng. World 11, 53 (1976).

J. Geophys. Res.

R. N. Sachdev, J. Geophys. Res. 47, 5413 (1969).
[CrossRef]

J. Phys. E

D. P. Lucero, J. Phys. E 6, 281 (1973).
[CrossRef]

J. Sci. Instrum.

D. W. Hill, T. Powell, J. Sci. Instrum. 44, 731 (1967).
[CrossRef]

Other

K. G. Vohra, R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, “A Condenser Microphone ir Detector for Use in Single Tube ir Gas Analyzer for Health and Safety Surveys,” Paper presented in the First Asian Regional Congress on Radiation Protection, Bombay (15–20 December 1974).

R. N. Sachdev, G. Swarup, J. P. Gupta, K. K. Rajan, K. G. Vohra, Some Investigations on the Use of Infrared Technique for Gas Analysis, BARC I-463, Bhabha Atomic Research Centre, Trombay Report (1977).

W. B. Brugel, An Introduction to Infrared Spectroscopy (Methuen, London, 1957).

L. E. Kinsler, A. R. Frey, Fundamentals of Acoustics (Wiley, New York, 1964).

S. Glasstone, Thermodynamics for Chemists (Van Nostrand, Princeton, N.J., 1964).

R. N. Sachdev, K. K. Rajan, A micro-barograph, BARC/AM/42, Bhabha Atomic Research Centre, Trombay Report (1968).

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Figures (4)

Fig. 1
Fig. 1

Schematic of a pneumatic ir detector.

Fig. 2
Fig. 2

Block diagram showing two alternative methods for measuring capacitance variation of the pneumatic detector. The electronic circuit following the two alternatives is common to both methods for obtaining the integrated output from the detector.

Fig. 3
Fig. 3

Variation of output from a condenser-microphone CO detector with chopping frequency.

Fig. 4
Fig. 4

(a), (b) Variation of signal due to unattenuated beam with pressure of filter gas filling in the ir detector (c) variation of signal due to 300-ppm concentration of CO2 in the 20-cm sample tube.

Tables (1)

Tables Icon

Table I Variation of the Factor [1 − exp(−μ ν u)/{1 − exp(−μ ν w)}] with the Pressure of Filling in the Detector

Equations (17)

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I ν [ 1 exp ( μ ν P l ) ] ,
E = 0 T / 2 I ν [ 1 exp ( μ ν P l ) ] sin ω t d t = 2 I ν ω [ 1 exp ( μ ν P l ) ] .
θ ˆ = E / ( m C υ ) .
p = ( P / Ө ) θ ˆ ,
p = 2 P I ν [ 1 exp ( μ ν P l ) ] m C υ Ө ω = 2 P I ν [ 1 exp ( μ ν P l ) ] ρ V C υ Ө ω ,
d ¯ = ( p a 2 ) / ( 8 τ ) ,
Δ C = C 0 ( d ¯ / d ) .
Δ C = C 0 a 2 2 P I ν [ 1 exp ( μ ν P l ) ] 8 d τ ρ C υ V Ө ω = P C 0 a 2 I ν [ 1 exp ( μ ν P l ) ] 4 ρ d τ V C υ Ө ω .
Δ C = K I ν [ 1 exp ( μ ν w ) ] ,
Δ C = K I ν exp ( μ ν u ) [ 1 exp ( μ ν w ) ] ,
Δ C = K I ν { exp ( μ ν u ) exp [ μ ν ( u + w ) ] } .
Δ C = K I ν exp ( μ ν u ) .
δ C = ( Δ C Δ C ) = K I ν [ 1 exp ( μ ν w ) exp ( μ ν u ) ] .
ν 1 ν 2 δ C d ν = K ν 1 ν 2 I ν [ 1 exp ( μ ν w ) exp ( μ ν u ) ] d ν .
p = 2 P I ν [ 1 exp ( μ ν P l ) ] ρ V ω C υ Ө .
V R = i R L = E 0 Δ C · sin ( ω t + ϕ ) C [ ( 1 ω C o R L ) 2 + 1 ] 1 / 2 ,
δ C Δ C = 1 exp ( μ ν w ) exp ( μ ν u ) 1 exp ( μ ν w ) = 1 exp ( μ ν u ) 1 exp ( μ ν w ) .

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