Process and apparatus for absolute interferometric measurement of physical magnitudes utilizing a variable center frequency pass-band filter located downstream of a light beam source
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United States of America Patent
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Jul 26, 1994
Grant Date -
N/A
app pub date -
Feb 21, 1992
filing date -
Feb 27, 1991
priority date (Note) -
Expired
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Abstract
A superluminescent source emits a wide-band light beam, that is frequency modulated by a filter with a pass band centred on a frequency that is made to vary according to a predetermined law so as to frequency modulate the light beam. Means for splitting and recombining beams determine a mutual phase shift between two components of the beam that depends on the physical magnitude to be measured and is detected by a detector as an indication of the value of the magnitude itself.
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