## What is the difference between dispersive and Fourier transform spectroscopy?

## How do you convert an interferogram to a spectrum?

- The interferogram is converted to a spectrum by
**Fourier**transformation. This requires it to be stored in digital form as a series of values at equal intervals of the path difference between the two beams.

## What is phase shifting phase shifting interferometry?

**Fourier**-**Transform**Phase-Shifting Interferometry As surfaces are added to the**interferometer**cavity, the observed interferogram is a linear superposition of the interferograms from the combinatorial collec- tion of all possible elemental cavities.

## What is interpolation in laser interferogram analysis?

- Values of the interferogram at times corresponding to zero crossings of the laser signal are found by interpolation. The result of
**Fourier**transformation is a spectrum of the signal at a series of discrete wavelengths. The range of wavelengths that can be used in the calculation is limited by the separation of the data points in the interferogram.

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