Method and apparatus for simultaneously measuring a plurality of spectral wavelengths present in electromagnetic radiation
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United States of America Patent
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Feb 27, 1990
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N/A
app pub date -
Jun 15, 1989
filing date -
Jun 2, 1988
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Abstract
An apparatus and method simultaneously measures a plurality of spectral wavelengths present in electromagnetic radiation. A modulatable birefringent optical element is employed to divide a polarized light beam into two components, thereby producing a phase difference in two resulting light beams such that the two beams can be made to interfere with one another when recombined, the interference pattern providing the wavelength information required for the analysis of the incident light. The interferometer thus created performs in a similar manner to a Michelson interferometer, but with no moving parts, and with a resolution dependent on the degree of phase shift introduced by the modulator.
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