Interferometer Sources Fringe formation and data acquisition

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The interferometer light source controls fringe formation and data acquisition. Long coherence (laser) simultaneously creates fringes over all cavity lengths, from less than a micrometer to many hundreds of meters. Whereas a broadband, white light source creates fringes in a narrow micrometer wide region. The source wavelength, spectrum and variability control data acquisition: If fixed wavelength mechanical phase shifting is required, if variable wavelength or spectrally controlled, fixed cavity length acquisition is possible. One source type will not enable all applications. This paper will discuss various sources, associated data acquisition techniques and their application.