Optics of Searchlight Illumination

E. O. Hulburt

doi:10.1364/JOSA.36.000483

Journal of the Optical Society of America
Vol. 36,
Issue 8,
pp. 483-491
(1946)
•https://doi.org/10.1364/JOSA.36.000483

Optics of Searchlight Illumination

E. O. Hulburt

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E. O. Hulburt, "Optics of Searchlight Illumination," J. Opt. Soc. Am. 36, 483-491 (1946)

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Weather, amount of haze	Visual range υ, sea miles	Attenuation β sea mile⁻¹	Transmission α per sea mile
Exceptionally clear	37.3	0.105	0.9
	14.4	0.273	0.8
Clear	11.0	0.356	0.7
	7.67	0.511	0.6
	5.65	0.693	0.5
	4.28	0.916	0.4
Light haze	3.25	1.204	0.3
	2.44	1.608	0.2
	1.70	2.303	0.1
Thin fog	1.31	2.997	0.05

	Amperes	Volts	Kilowatts	Max. beam candlepower without shutter	Lumens per watt
Army-60 inch	150	78	11.7	400,000,000	6.2
Navy-36 inch	195	90	17.5	340,000,000	7.2

Weather, amount of haze	Visual range υ, sea miles	Attenuation β sea mile⁻¹	Transmission α per sea mile
Exceptionally clear	37.3	0.105	0.9
	14.4	0.273	0.8
Clear	11.0	0.356	0.7
	7.67	0.511	0.6
	5.65	0.693	0.5
	4.28	0.916	0.4
Light haze	3.25	1.204	0.3
	2.44	1.608	0.2
	1.70	2.303	0.1
Thin fog	1.31	2.997	0.05

	Amperes	Volts	Kilowatts	Max. beam candlepower without shutter	Lumens per watt
Army-60 inch	150	78	11.7	400,000,000	6.2
Navy-36 inch	195	90	17.5	340,000,000	7.2

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Equations (21)

Journal of the Optical Society of America