Infrared gas-filter correlation instrument for in situ measurement of gaseous pollutant concentrations

W. F. Herget; J. A. Jahnke; D. E. Burch; D. A. Gryvnak

doi:10.1364/AO.15.001222

Applied Optics
Vol. 15,
Issue 5,
pp. 1222-1228
(1976)
•https://doi.org/10.1364/AO.15.001222

Infrared gas-filter correlation instrument for in situ measurement of gaseous pollutant concentrations

W. F. Herget, J. A. Jahnke, D. E. Burch, and D. A. Gryvnak

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W. F. Herget, J. A. Jahnke, D. E. Burch, and D. A. Gryvnak, "Infrared gas-filter correlation instrument for in situ measurement of gaseous pollutant concentrations," Appl. Opt. 15, 1222-1228 (1976)

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Abstract

An ir analyzer employing gas-filter correlation techniques has been designed and constructed to measure the concentrations of CO, NO, SO₂, HCL, and HF in the stacks or ducts of stationary pollutant sources. Use of a retroreflector allows the stack to be double passed, and no sample is extracted. For each gas, small interchangeable fixed-position grating polychromators are used as narrow (~1.5-cm⁻¹) multiband spectral filters with the bands corresponding to locations of selected absorption lines. The approximate useful ranges (in parts per million-meters) over which this analyzer operates are 10–4000 for NO, 10–1500 for CO, 50–40,000 for SO₂ 10–2000 for HCl, and 5–200 for HF. The discrimination against other gases and particulates is excellent. The analyzer has been tested in the laboratory and on a variety of pollutant sources.

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Species	Spectral bandpass	Correlation cell^a	NEAT^b (atm cm)	Interfering species^c
NO	Six intervals, each centered on a pair of NO lines near 1900 cm⁻¹	L = 2 cm	InSb	DR = 10,000: for H₂O at 400 K
NO		P = 0.414 atm	0.0006	DR = 10,000: for H₂O at 400 K
CO	Eleven intervals, each centered on a CO line between 2150 cm⁻¹ and 2200 cm⁻¹	L = 2 cm	InSb	DR > 200,000:1 for CO₂ at 400 K
CO		P = 0.461 atm	0.0001	DR ≃ −50,000:1 for H₂O at 400 K
SO₂	Two intervals near 2538 cm⁻¹ and 2513 cm⁻¹	L = 5 cm	PbS	No significant interference by gases common to coal-burning plants
SO₂	Two intervals near 2538 cm⁻¹ and 2513 cm⁻¹	P = 2 atm	0.004
HCL	Four intervals, each includes isotopic pair, between 2750 cm⁻¹ and 2850 cm⁻¹	L = 1 cm	PbS	No significant interference by gases common to coal-burning plants
HCL		P = 0.539 atm	0.0005
HF	Three intervals, each centered on a line between 3995 cm⁻¹ and 4080 cm⁻¹	L = 1 cm	PbS	DR ≃ 50,000:1 for H₂O at 400 k
HF		P = 0.164 atm	0.0001	DR ≃ 50,000:1 for H₂O at 400 k

Span gas^a (ppm)	GFC		TECO^d		Reference method 6
Span gas^a (ppm)	(ppm)	(% error)^b,^c	(ppm)	(% error)^b	(ppm)	(% error)^b
990	1047	+5.8	965	−2.5	947	−4.3
980	1007	+2.8	915	−6.6	761	−22
520	530	+1.9	520	—	508	−2.1
471	495	+5.1	490	+4.0	390	−17

Species	Spectral bandpass	Correlation cell^a	NEAT^b (atm cm)	Interfering species^c
NO	Six intervals, each centered on a pair of NO lines near 1900 cm⁻¹	L = 2 cm	InSb	DR = 10,000: for H₂O at 400 K
NO		P = 0.414 atm	0.0006	DR = 10,000: for H₂O at 400 K
CO	Eleven intervals, each centered on a CO line between 2150 cm⁻¹ and 2200 cm⁻¹	L = 2 cm	InSb	DR > 200,000:1 for CO₂ at 400 K
CO		P = 0.461 atm	0.0001	DR ≃ −50,000:1 for H₂O at 400 K
SO₂	Two intervals near 2538 cm⁻¹ and 2513 cm⁻¹	L = 5 cm	PbS	No significant interference by gases common to coal-burning plants
SO₂	Two intervals near 2538 cm⁻¹ and 2513 cm⁻¹	P = 2 atm	0.004
HCL	Four intervals, each includes isotopic pair, between 2750 cm⁻¹ and 2850 cm⁻¹	L = 1 cm	PbS	No significant interference by gases common to coal-burning plants
HCL		P = 0.539 atm	0.0005
HF	Three intervals, each centered on a line between 3995 cm⁻¹ and 4080 cm⁻¹	L = 1 cm	PbS	DR ≃ 50,000:1 for H₂O at 400 k
HF		P = 0.164 atm	0.0001	DR ≃ 50,000:1 for H₂O at 400 k

Span gas^a (ppm)	GFC		TECO^d		Reference method 6
Span gas^a (ppm)	(ppm)	(% error)^b,^c	(ppm)	(% error)^b	(ppm)	(% error)^b
990	1047	+5.8	965	−2.5	947	−4.3
980	1007	+2.8	915	−6.6	761	−22
520	530	+1.9	520	—	508	−2.1
471	495	+5.1	490	+4.0	390	−17

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Applied Optics