Relative Spectral Attenuation Coefficients of Water

L. F. Drummeter; G. L. Knestrick

doi:10.1364/AO.6.002101

Applied Optics
Vol. 6,
Issue 12,
pp. 2101-2103
(1967)
•https://doi.org/10.1364/AO.6.002101

Relative Spectral Attenuation Coefficients of Water

L. F. Drummeter and G. L. Knestrick

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L. F. Drummeter and G. L. Knestrick, "Relative Spectral Attenuation Coefficients of Water," Appl. Opt. 6, 2101-2103 (1967)

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Abstract

The relative variation of attenuation coefficient with wavelength has been studied in the laboratory for distilled water and seawater. The study was for the purpose of locating any very fine structure in the attenuation vs wavelength curve. The spectral region from 3750 Å to 6850 Å was examined with 0.2 Å resolution; water paths were 9.7 m and 19.5 m. Studies of the microphotometer traces show no discernible very fine structure in either distilled water or seawater. The limit of detection was set by plate grain and corresponded to a variation of 0.1 × 10⁴/cm in the attenuation coefficient. Curves of relative coefficients vs wavelength show very shallow unstructured peaks at about 4700 Å, 5150 Å, and 5500 Å, but these are relatively broad (~50 Å).

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λ(Å)	(ΔD)_n	D₁	(ΔI)_nt	I₁t	(ΔI)_n/I₁

		0 Plates

4000	0.005	0.04	0.6	3.5	0.17
	0.005	0.012	5.0	2.7	1.8
4200	0.008	0.33	0.10	7.5	0.013
	0.007	0.218	0.08	6.3	0.013
4400	0.015	1.08	0.18	16.1	0.011
	0.01	1.08	0.12	16.1	0.007
4600	0.02	1.70	0.33	24.5	0.013
	0.017	2.03	0.32	30.2	0.011
4800	0.015	1.37	0.30	31.5	0.009
	0.02	2.0	0.40	44.2	0.009
5000	0.01	0.30	0.20	11.7	0.017
	0.01	0.68	0.18	19.0	0.009
		F Plates

5200	0.01	0.64	0.36	31.5	0.011
	0.01	0.86	0.32	38.5	0.008
5400	0.015	1.18	0.37	48	0.008
	0.015	1.66	0.45	60	0.008
5600	0.02	1.49	0.60	56	0.011
	0.015	2.2	0.55	77	0.007
5800	0.03	1.70	0.90	62	0.014
	0.03	2.6	1.2	92	0.013
6000	0.01	0.44	0.24	24.2	0.010
	0.02	0.85	0.65	37	0.017
6200	0.005	0.16	0.10	9.9	0.010
	0.01	0.59	0.23	19	0.012
6400	0.005	0.20	0.11	10.9	0.010
	0.01	0.72	0.26	21.8	0.012
6600	0.003	0.035	0.12	6.8	0.018
	0.008	0.25	0.18	10.8	0.017

λ(Å)	ΔT/T	Δβ/cm(10⁻⁴)	β/cm(10⁻⁴)^a
4000	0.17	2.0	1.0– 9.0
4200	0.013	0.1	0.9– 7.4
4400	0.007	0.1	0.8– 4.6
4600	0.011	0.1	0.6– 3.6
4800	0.009	0.1	0.5– 3.6
5000	0.009	0.1	1.0– 3.8
5200	0.008	0.1	1.0– 4.1
5400	0.008	0.1	0.9– 4.8
5600	0.007	0.1	2.0– 6.2
5800	0.013	0.1	2.6– 7.8
6000	0.010	0.1	12 –25
6200	0.010	0.1	17 –29
6400	0.010	0.1	20 –32
6600	0.017	0.2	28 –37

λ(Å)	(ΔD)_n	D₁	(ΔI)_nt	I₁t	(ΔI)_n/I₁

		0 Plates

4000	0.005	0.04	0.6	3.5	0.17
	0.005	0.012	5.0	2.7	1.8
4200	0.008	0.33	0.10	7.5	0.013
	0.007	0.218	0.08	6.3	0.013
4400	0.015	1.08	0.18	16.1	0.011
	0.01	1.08	0.12	16.1	0.007
4600	0.02	1.70	0.33	24.5	0.013
	0.017	2.03	0.32	30.2	0.011
4800	0.015	1.37	0.30	31.5	0.009
	0.02	2.0	0.40	44.2	0.009
5000	0.01	0.30	0.20	11.7	0.017
	0.01	0.68	0.18	19.0	0.009
		F Plates

5200	0.01	0.64	0.36	31.5	0.011
	0.01	0.86	0.32	38.5	0.008
5400	0.015	1.18	0.37	48	0.008
	0.015	1.66	0.45	60	0.008
5600	0.02	1.49	0.60	56	0.011
	0.015	2.2	0.55	77	0.007
5800	0.03	1.70	0.90	62	0.014
	0.03	2.6	1.2	92	0.013
6000	0.01	0.44	0.24	24.2	0.010
	0.02	0.85	0.65	37	0.017
6200	0.005	0.16	0.10	9.9	0.010
	0.01	0.59	0.23	19	0.012
6400	0.005	0.20	0.11	10.9	0.010
	0.01	0.72	0.26	21.8	0.012
6600	0.003	0.035	0.12	6.8	0.018
	0.008	0.25	0.18	10.8	0.017

λ(Å)	ΔT/T	Δβ/cm(10⁻⁴)	β/cm(10⁻⁴)^a
4000	0.17	2.0	1.0– 9.0
4200	0.013	0.1	0.9– 7.4
4400	0.007	0.1	0.8– 4.6
4600	0.011	0.1	0.6– 3.6
4800	0.009	0.1	0.5– 3.6
5000	0.009	0.1	1.0– 3.8
5200	0.008	0.1	1.0– 4.1
5400	0.008	0.1	0.9– 4.8
5600	0.007	0.1	2.0– 6.2
5800	0.013	0.1	2.6– 7.8
6000	0.010	0.1	12 –25
6200	0.010	0.1	17 –29
6400	0.010	0.1	20 –32
6600	0.017	0.2	28 –37

Abstract

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Tables (2)

Equations (6)

Applied Optics