Air refractive index measurement using low-coherence interferometry

Tomáš Pikálek; Zdeněk Buchta

doi:10.1364/AO.54.005024

Applied Optics
Vol. 54,
Issue 16,
pp. 5024-5030
(2015)
•https://doi.org/10.1364/AO.54.005024

Air refractive index measurement using low-coherence interferometry

Tomáš Pikálek and Zdeněk Buchta

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Tomáš Pikálek and Zdeněk Buchta, "Air refractive index measurement using low-coherence interferometry," Appl. Opt. 54, 5024-5030 (2015)

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Table of Contents Category
- Interferometry
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About this Article
History
- Original Manuscript: February 9, 2015
- Revised Manuscript: May 5, 2015
- Manuscript Accepted: May 5, 2015
- Published: May 25, 2015
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Virtual Journal for Biomedical Optics Vol. 10, Iss. 6

Abstract

This paper presents a theoretical analysis and an experimental verification of a direct method for a refractive index of air measurement combining low-coherence interferometry and laser interferometry. The method is based on monitoring optical path changes in a measuring arm of the Michelson interferometer caused by the different optical environment in a double-spaced glass cell. This article presents a set of experimental results in comparison with the results obtained by a couple of reference techniques and proves the ability of the designed method to measure the refractive index of air with accuracy in the order of $10^{- 8}$ .

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Date of	Temperature	Pressure	Humidity	${CO}_{2}$	Refractive Index of Air			Edlén
Measurement	[°C]	[kPa]	[%]	[ppm]	New Method	Reference^a	Edlén [7]	Difference^b
21 April, 12:27	20.14	99.20	35.2	840	1.00,026,568	1.00,026,568	1.00,0265,68	$1 \times 10^{- 9}$
21 April, 12:37	20.23	99.20	35.7	880	1.00,026,565		1.00,026,562	$3 \times 10^{- 8}$
21 April, 13:12	20.24	99.15	35.8	930	1.00,026,547	1.00,026,547	1.00,026,549	$- 2 \times 10^{- 8}$
21 April, 13:21	20.25	99.14	36.1	920	1.00,026,543		1.00,026,545	$- 2 \times 10^{- 8}$
21 April, 14:53	20.22	99.03	33.4	850	1.000,265,15	1.000,265,15	1.000,265,17	$- 2 \times 10^{- 8}$
21 April, 15:03	20.27	99.01	33.8	910	1.00,026,505		1.00,026,509	$- 4 \times 10^{- 8}$
21 April, 15:51	20.33	98.96	32.8	880	1.00,026,489	1.00,026,489	1.00,026,490	$- 1 \times 10^{- 8}$
21 April, 16:01	20.38	98.96	33.0	910	1.00,02,6487		1.00,026,488	$- 9 \times 10^{- 9}$
22 April, 08:25	19.51	99.26	35.8	810	1.00,026,639	1.00,026,639	1.00,026,642	$- 3 \times 10^{- 8}$
22 April, 08:36	19.73	99.26	36.5	880	1.000,266,28		1.000,266,26	$2 \times 10^{- 8}$
22 April, 10:44	19.66	99.27	34.7	740	1.000,266,29	1.000,266,29	1.000,266,32	$- 3 \times 10^{- 8}$
22 April, 10:52	19.80	99.27	35.0	810	1.000,266,20		1.000,266,22	$- 2 \times 10^{- 8}$
22 April, 13:08	20.03	99.15	36.9	790	1.00,026,564	1.00,026,564	1.00,026,5,63	$3 \times 10^{- 9}$
22 April, 13:16	20.10	99.14	37.3	860	1.000,265,55		1.00,026,556	$- 6 \times 10^{- 9}$
22 April, 15:13	20.06	99.05	35.1	750	1.000,265,37	1.000,265,37	1.00,026,535	$2 \times 10^{- 8}$
April 22, 15:21	20.14	99.05	35.3	800	1.00,02,6531		1.00,026,529	$2 \times 10^{- 8}$

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