| 摘要 |
Apparatus and a method for producing Fourier spectra for a test object utilizing a plurality of laser interference signals each having a period corresponding to a wavelength of a laser beam and being out of phase by 1/n of the wavelength of the laser beam, n being a positive integer above 1. An infrared interference signal representing the test object after the test object is irradiated with an infrared light beam is sampled at a time interval corresponding to 1/n of the wavelength of the at least one laser interference signal and n sets of sampled data corresponding to the infrared interference signal are produced. Each set of sampled data is Fourier-transformed independently from the other to generate a Fourier spectrum corresponding to each set. All of the independently generated Fourier spectra are later combined to produce a Fourier spectrum corresponding to the infrared interference signal.
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