Optical Instrumentation for Tracking High Altitude Vapor Releases by Day

G. T. Best

doi:10.1364/AO.9.002666

Applied Optics
Vol. 9,
Issue 12,
pp. 2666-2672
(1970)
•https://doi.org/10.1364/AO.9.002666

Optical Instrumentation for Tracking High Altitude Vapor Releases by Day

G. T. Best

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G. T. Best, "Optical Instrumentation for Tracking High Altitude Vapor Releases by Day," Appl. Opt. 9, 2666-2672 (1970)

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Abstract

High altitude chemical vapor trails may not be photographed by day because of the intense background light of the sky. A comparison of several possible emission line detectors is given. An instrument incorporating an ultra-narrow interference filter in a differential radiometer is described and the results of a successful field test are given.

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Trail	Method	S/N Ratio
Li	λ/200 interferometer	185
Li	λ/50 interferometer	100
Li	2.5 Å interference filter	90
Na	Resonance cell, 20% efficiency	27
Na	2.5 Å interference filter	6.6
AlO	2.5 Å interference filter	0.8

	Filter No. 1			Filter No. 2

Angle of Incidence θ (deg)	Wavelength of peak transmission λ (Å)	Half-width $Δ λ_{\frac{1}{2}}$ (Å)	Transmission T_pk (%)	Wavelength of peak transmission λ (Å)	Half-width $Δ λ_{\frac{1}{2}}$ (Å)	Transmission T_pk (%)
0	6705.2	2.5	42	6708.9	1.8	31
1	6705.7	2.5	40	6708.5	2.65	30
2	6704.2	2.6	40	6706.9	2.8	30
3	6701.0	2.6	42	6704.8	2.8	29
4	6699.1	2.6	40	6701.2	2.85	29

Trail	Method	S/N Ratio
Li	λ/200 interferometer	185
Li	λ/50 interferometer	100
Li	2.5 Å interference filter	90
Na	Resonance cell, 20% efficiency	27
Na	2.5 Å interference filter	6.6
AlO	2.5 Å interference filter	0.8

	Filter No. 1			Filter No. 2

Angle of Incidence θ (deg)	Wavelength of peak transmission λ (Å)	Half-width $Δ λ_{\frac{1}{2}}$ (Å)	Transmission T_pk (%)	Wavelength of peak transmission λ (Å)	Half-width $Δ λ_{\frac{1}{2}}$ (Å)	Transmission T_pk (%)
0	6705.2	2.5	42	6708.9	1.8	31
1	6705.7	2.5	40	6708.5	2.65	30
2	6704.2	2.6	40	6706.9	2.8	30
3	6701.0	2.6	42	6704.8	2.8	29
4	6699.1	2.6	40	6701.2	2.85	29

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Equations (1)

Applied Optics