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Opto-electronic detection device for remotely detecting a physical magnitude

  • US 4,867,565 A
  • Filed: 11/12/1987
  • Issued: 09/19/1989
  • Est. Priority Date: 03/13/1986
  • Status: Expired due to Fees
First Claim
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1. An opto-electronic detection device for remotely detecting a physical magnitude, the device comprising:

  • a source of incoherent light,an interferometric sensor subjecting the incoherent light from the source to a periodic or quasi-periodic modulation of its spectrum at a frequency which is a function of a magnitude to be measured,a first optical fiber connecting the source of light to the sensor with the corresponding optical path length difference in the sensor being greater than the coherence length of the source,a spectrum analyzing means including;

    a optical demodulation system essentially constituted by a set of birefringent elements placed between a polarizer and an analyzer which are parallel, for obtaining a birefringence gradient along a privileged optical direction x,a multipoint linear detector oriented parallel to the privileged optical direction and having a plurality of photosensitive elements, and electronic circuits for acquiring and processing the signals produced by the detector,the demodulation system performing a Fourier transform of the light modulated by the said magnitude in the sensor, permitting to determine the instantaneous path length difference in the sensor and thus the value of the physical magnitude to be measured, anda second optical fiber connecting the sensor to the spectrum analyzing means.

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