Fluorescence response of mineral oils: spectral yield vs absorption and decay time

Paolo Camagni; Angelo Colombo; Claudio Koechler; Nicoló Omenetto; Pan Qi; Guglielmo Rossi

doi:10.1364/AO.30.000026

Applied Optics
Vol. 30,
Issue 1,
pp. 26-35
(1991)
•https://doi.org/10.1364/AO.30.000026

Fluorescence response of mineral oils: spectral yield vs absorption and decay time

Paolo Camagni, Angelo Colombo, Claudio Koechler, Nicoló Omenetto, Pan Qi, and Guglielmo Rossi

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Paolo Camagni, Angelo Colombo, Claudio Koechler, Nicoló Omenetto, Pan Qi, and Guglielmo Rossi, "Fluorescence response of mineral oils: spectral yield vs absorption and decay time," Appl. Opt. 30, 26-35 (1991)

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Abstract

The fluorescent emission from film samples of representative oils has been investigated by means of two independent experiments: (i) time-resolved fluorosensing at a fixed excitation frequency, by which the spectral emission yield and the associated decay times, τ_λ, were determined, and (ii) monitoring of the integrated fluorescence in a fixed spectral band as a function of film thickness, from which extinction coefficients α_λ were derived at a number of excitation frequencies. After checking the good mutual consistency of corresponding emission data obtained in the two types of experiments, a unified analysis was elaborated in terms of a renormalized conversion efficiency, i.e., correcting the measured spectral yields for the ratio (τ/α). This quantity can be shown by an appropriate model to be typical of the emitting fluorophores but independent of absorption or quenching effects due to the complex oil medium. This was indeed found to be the case for a large variety of oils, in spite of extreme variations in their absolute emission yield.

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OIL	Centre of Spectral Band (nm)
	400		440		490		560		630
	ɛ (nm⁻¹⁾	τ (ns)	ɛ (nm⁻¹⁾	τ (ns)	ɛ (nm⁻¹⁾	τ (ns)	ɛ (nm⁻¹⁾	τ (ns)	ɛ (nm⁻¹⁾	τ (ns)
FORCADOS	2.3 10⁻⁴	9.5	7.9 10⁻⁴	11.0	8.4 10⁻⁴	11.5	4.2 10⁻⁴	11.9	9.8 10⁻⁵	11.9
PENNINGTON	2.5 10⁻⁴	9.1	7.0 10⁻⁴	10.0	6.3 10⁻⁴	10.6	3.1 10⁻⁴	11.1	7.6 10⁻⁵	11.1
EKOFISK	3.1 10⁻⁴	8.3	6.1 10⁻⁴	9.6	4.5 10⁻⁴	10.9	2.3 10⁻⁴	11.4	5.7 10⁻⁵	11.4
BRENT	7.1 10⁻⁵	6.7	2.6 10⁻⁴	8.2	3.2 10⁻⁴	8.7	2.1 10⁻⁴	8.9	6.3 10⁻⁵	9.1
ES SIDER	4.9 10⁻⁵	4.6	1.6 10⁻⁴	5.3	1.9 10⁻⁴	6.0	1.3 10⁻⁴	6.4	4.2 10⁻⁵	6.7
ARABIAN LIGHT	3.7 10⁻⁵	3.8	1.3 10⁻⁴	4.5	1.8 10⁻⁴	5.0	1.3 10⁻⁴	5.5	4.8 10⁻⁵	6.1
KIRKUK	3.6 10⁻⁵	2.3	1.3 10⁻⁴	3.2	1.8 10⁻⁴	3.7	1.2 10⁻⁴	4.1	4.4 10⁻⁵	5.0
ARABIAN MEDIUM	2.0 10⁻⁵	1.5	6.7 10⁻⁵	2.0	9.7 10⁻⁵	2.6	7.8 10⁻⁵	3.0	3.3 10⁻⁵	3.5
ARABIAN HEAVY	1.4 10⁻⁵	1.8	4.1 10⁻⁵	2.1	5.1 10⁻⁵	2.5	3.8 10⁻⁵	3.0	1.7 10⁻⁵	3.5
MAYA	5.0 10⁻⁶	1.8	1.5 10⁻⁵	1.8	2.0 10⁻⁵	2.0	1.5 10⁻⁵	2.3	6.0 10⁻⁶	2.7

Oil	α (µm⁻¹)					ΔS^∞ ^(a)
Oil	337	355 ^(b)	365	407	470	337	365	407	470
FORCADOS	0.07	0.14	0.11	0.04	0.03	849	2009	3000	2617
PENNINGTON	0.22	0.15	0.12	0.08	0.04	1141	1390	2263	1182
EKOFISK	0.14	0.09	0.07	-	-	437	868	-	-
BRENT	0.17	0.13	0.11	0.05	0.02	667	1603	2429	2500
ES SIDER	0.40	0.36	0.34	0.27	0.14	715	738	1450	581
ARABIAN LIGHT	0.66	0.57	0.52	0.27	0.22	440	411	328	683
KIRKUK	0.71	0.58	0.51	0.26	0.11	405	402	755	349
ARABIAN MEDIUM	0.69	0.58	0.51	0.28	0.11	250	555	460	482
ARABIAN HEAVY	1.18	0.69	0.52	0.25	0.17	140	331	346	357
MAYA	2.59	1.70	1.36	0.65	0.13	93	91	57	159

OIL	Centre of Spectral Band (nm)
OIL	400	440	490	560	630
1. FORCADOS	0.44	1.25	1.20	0.53	0.12
2. PENNINGTON	0.63	1.50	1.13	0.45	0.10
3. EKOFISK	0.45	0.70	0.37	0.18	0.05
4. BRENT	0.20	0.50	0.52	0.31	0.09
5. ES SIDER	0.68	1.65	1.50	0.73	0.23
6. ARABIAN LIGHT	0.50	1.27	1.50	0.92	0.31
7. KIRKUK	1.38	3.00	3.25	1.85	0.51
8. ARABIAN MEDIUM	1.10	2.18	2.20	1.45	0.50
9. ARABIAN HEAVY	0.55	1.20	1.20	0.72	0.27
10. MAYA	0.68	1.70	1.75	1.10	0.38

OIL	Centre of Spectral Band (nm)
	400		440		490		560		630
	ɛ (nm⁻¹⁾	τ (ns)	ɛ (nm⁻¹⁾	τ (ns)	ɛ (nm⁻¹⁾	τ (ns)	ɛ (nm⁻¹⁾	τ (ns)	ɛ (nm⁻¹⁾	τ (ns)
FORCADOS	2.3 10⁻⁴	9.5	7.9 10⁻⁴	11.0	8.4 10⁻⁴	11.5	4.2 10⁻⁴	11.9	9.8 10⁻⁵	11.9
PENNINGTON	2.5 10⁻⁴	9.1	7.0 10⁻⁴	10.0	6.3 10⁻⁴	10.6	3.1 10⁻⁴	11.1	7.6 10⁻⁵	11.1
EKOFISK	3.1 10⁻⁴	8.3	6.1 10⁻⁴	9.6	4.5 10⁻⁴	10.9	2.3 10⁻⁴	11.4	5.7 10⁻⁵	11.4
BRENT	7.1 10⁻⁵	6.7	2.6 10⁻⁴	8.2	3.2 10⁻⁴	8.7	2.1 10⁻⁴	8.9	6.3 10⁻⁵	9.1
ES SIDER	4.9 10⁻⁵	4.6	1.6 10⁻⁴	5.3	1.9 10⁻⁴	6.0	1.3 10⁻⁴	6.4	4.2 10⁻⁵	6.7
ARABIAN LIGHT	3.7 10⁻⁵	3.8	1.3 10⁻⁴	4.5	1.8 10⁻⁴	5.0	1.3 10⁻⁴	5.5	4.8 10⁻⁵	6.1
KIRKUK	3.6 10⁻⁵	2.3	1.3 10⁻⁴	3.2	1.8 10⁻⁴	3.7	1.2 10⁻⁴	4.1	4.4 10⁻⁵	5.0
ARABIAN MEDIUM	2.0 10⁻⁵	1.5	6.7 10⁻⁵	2.0	9.7 10⁻⁵	2.6	7.8 10⁻⁵	3.0	3.3 10⁻⁵	3.5
ARABIAN HEAVY	1.4 10⁻⁵	1.8	4.1 10⁻⁵	2.1	5.1 10⁻⁵	2.5	3.8 10⁻⁵	3.0	1.7 10⁻⁵	3.5
MAYA	5.0 10⁻⁶	1.8	1.5 10⁻⁵	1.8	2.0 10⁻⁵	2.0	1.5 10⁻⁵	2.3	6.0 10⁻⁶	2.7

Oil	α (µm⁻¹)					ΔS^∞ ^(a)
Oil	337	355 ^(b)	365	407	470	337	365	407	470
FORCADOS	0.07	0.14	0.11	0.04	0.03	849	2009	3000	2617
PENNINGTON	0.22	0.15	0.12	0.08	0.04	1141	1390	2263	1182
EKOFISK	0.14	0.09	0.07	-	-	437	868	-	-
BRENT	0.17	0.13	0.11	0.05	0.02	667	1603	2429	2500
ES SIDER	0.40	0.36	0.34	0.27	0.14	715	738	1450	581
ARABIAN LIGHT	0.66	0.57	0.52	0.27	0.22	440	411	328	683
KIRKUK	0.71	0.58	0.51	0.26	0.11	405	402	755	349
ARABIAN MEDIUM	0.69	0.58	0.51	0.28	0.11	250	555	460	482
ARABIAN HEAVY	1.18	0.69	0.52	0.25	0.17	140	331	346	357
MAYA	2.59	1.70	1.36	0.65	0.13	93	91	57	159

Abstract

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Figures (9)

Tables (3)

Equations (14)

Applied Optics