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Fiber optic pressure sensor with temperature compensation and reference

  • US 4,487,206 A
  • Filed: 10/13/1982
  • Issued: 12/11/1984
  • Est. Priority Date: 10/13/1982
  • Status: Expired due to Term
First Claim
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1. An intravascular blood pressure catheter of the fiber optic type comprising:

  • a catheter member containing at least three optic fibers including a source fiber, a signal fiber and a reference fiber;

    a catheter sensing tip including a pressure deformable diaphragm with an inside face, the diaphragm having a reflecting surface finish on the inside face;

    means for directing a source of light through said source optic fiber toward said tip, said source of light being controlled in intensity;

    a transparent body fastened to an end of said fibers into which body light emanates from said source fiber, said body including light-collimating lens means for redirecting light emanating from the source fiber into a column toward said reflecting surface finish and for directing reflected light therefrom falling on said lens means towards said signal optic fiber, said body further including mirror means positioned to receive a portion of the light transmitted into said body from said source optic fiber and oriented to reflect said portion into said reference fiber;

    signal sensing means for detecting the intensity of reflected light being returned in said signal optic fiber, the amount of light collected by the signal fiber being a function of the pressure;

    reference sensing means for detecting the intensity of reflected light being returned in said reference fiber; and

    ,control means responsive to the output of said reference sensing means to control the intensity of said source of light.

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