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Pressure sensor

  • US 5,450,853 A
  • Filed: 10/22/1993
  • Issued: 09/19/1995
  • Est. Priority Date: 10/22/1993
  • Status: Expired due to Term
First Claim
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1. A pressure sensor comprising:

  • a tubular member having a proximal end, a distal end and a window exposing the interior of the tubular member to the exterior of the tubular member wherein the proximal end of the tubular member is sealed;

    a column of ferrofluid partially filling the interior of the tubular member, the ferrofluid column capable of movement within the tubular member in response to external pressure exerted at the window of the tubular member;

    a gaseous column filling the remainder of the interior of the tubular member from the proximal end of the tubular member to the column of ferrofluid; and

    a transducer coupled to the tubular member for detecting the movement of the ferrofluid column in the tubular member and converting the detection to a signal proportional to the external pressure exerted at the window.

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