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Optical-fiber frequency domain interferometer with nanometer resolution and centimeter measuring range
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Figures

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FIG. 1.

A sketch diagram of the new optical-fiber frequency domain interferometer.

Image of FIG. 2.

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FIG. 2.

The spectral line shape of the OFDI light source (a) and the error library of the OFDI system (b).

Image of FIG. 3.

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FIG. 3.

Data processing procedures: typical output of the new OFDI system (a), the initial result of the delay time by Fourier transforming to the raw output data (b), and the ultimate delay time by another Fourier transforming and subsequent Gaussian fitting to the extended output data (c). The peak value of the fitted curve shown in red circle is the measured delay time.

Image of FIG. 4.

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FIG. 4.

Measured single-step length of the translation stage.

Image of FIG. 5.

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FIG. 5.

A diagram of the OFDI system for online measurement of the thickness of gauge blocks.

Tables

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Table I.

The measurement result of the gauge blocks.

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/content/aip/journal/rsi/84/11/10.1063/1.4829615
2013-11-13
2014-04-21

Abstract

A new optical-fiber frequency domain interferometer (OFDI) device for accurate measurement of the absolute distance between two stationary objects, with centimeter measuring range and nanometer resolution, has been developed. Its working principle and on-line data processing method were elaborated. The new OFDI instrument was constructed all with currently available commercial communication products. It adopted the wide-spectrum amplified spontaneous emission light as the light source and optical-fiber tip as the test probe. Since this device consists of only fibers or fiber coupled components, it is very compact, convenient to operate, and easy to carry. By measuring the single-step length of a translation stage and the thickness of standard gauge blocks, its ability in implementing nanometer resolution and centimeter measuring range on-line measurements was validated.

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Scitation: Optical-fiber frequency domain interferometer with nanometer resolution and centimeter measuring range
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/11/10.1063/1.4829615
10.1063/1.4829615
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