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Technique for optically measuring the temperature of an ultrasonically heated object

  • US 4,626,110 A
  • Filed: 05/03/1985
  • Issued: 12/02/1986
  • Est. Priority Date: 05/03/1985
  • Status: Expired due to Term
First Claim
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1. A method of monitoring the temperature of a volume of material that is being heated by absorption of ultrasonic energy being directed into said volume of material from its outside, comprising the steps of:

  • implanting within said material one end of an optical fiber transmission medium which carries an optical temperature sensor, said sensor and optical transmission medium adjacent said sensor being characterized by being made substantially entirely of non-compressible material and having an outer diameter that is substantially equal to or less than a wavelength of said ultrasonic energy in said material divided by the mathematical constant pi, andmonitoring the temperature of said sensor through connection with another end of said optical fiber transmission medium;

    whereby temperature artifacts that tend to be caused by ultrasonic energy interaction with the temperature sensor are minimized.

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