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Thermometer calibration

  • US 7,507,019 B2
  • Filed: 05/19/2006
  • Issued: 03/24/2009
  • Est. Priority Date: 05/19/2006
  • Status: Active Grant
First Claim
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1. A method for calibrating a thermometer, said thermometer comprising a primary temperature sensor and a reference temperature sensor, said reference temperature sensor being positioned proximate to the primary temperature sensor and being responsive to an extraneous temperature affecting the primary temperature sensor, said method comprising:

  • controlling the temperature of the reference temperature sensor to a first temperature value;

    measuring a characteristic of the reference temperature sensor at said first temperature value;

    repeating the controlling and measuring for at least one other temperature value different than the first temperature value;

    utilizing the temperature values and the measured characteristics to solve a calibration equation, said calibration equation relating temperature and measured characteristic of the reference temperature sensor wherein said repeating comprises;

    controlling the temperature of the reference temperature sensor to a second temperature value;

    measuring a characteristic of the reference temperature sensor at said second temperature value;

    controlling the temperature of the reference temperature sensor to a third temperature value; and

    measuring a characteristic of the reference temperature sensor at said third temperature value;

    wherein said utilizing comprises utilizing the first, second, and third temperature values and the three corresponding measured characteristics to solve the following calibration equation for a, b, and c;

    T s = a + b R + c R 2 where Ts is the temperature of the reference temperature sensor, R is the measured characteristic of the reference temperature sensor, and a, b, and c are calibration coefficients of the reference temperature sensor calculated based upon the three temperature values end the three corresponding measured characteristics; and

    using the calibrated reference temperature sensor to calibrate the primary temperature sensor.

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