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Practical lengths are remotely measured by excess fraction method using a tandem low-coherence interferometer through optical fiber networks. Interference fringes of high S/N are generated when the path difference between two interferometers is equal.
The group refractive index of BK-7 glass material is accurately measured using a tandem low-coherence interferometer, which is composed of a Mychelson interferometer and a Fizeau interferometer, within a combined standard uncertainty of 8.4ppm. The experimental results are compared with the value calculated from the conventional data base on the phase refractive index, within a difference of about...
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