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Temperature measuring device with thermocouple

  • US 4,588,308 A
  • Filed: 08/30/1984
  • Issued: 05/13/1986
  • Est. Priority Date: 09/02/1983
  • Status: Expired due to Fees
First Claim
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1. A temperature measuring device comprising:

  • a thermocouple (M1, M2) having a first output signal (V1) and a measuring point (A);

    reference contacts (C1, C2) connected to said thermocouple;

    a temperature detecting means (3), having a second output signal (V2), arranged in the vicinity of said reference contacts (C1, C2), for detecting the temperature variation of said reference contacts (C1, C2);

    a processing means for calculating the temperature at said measuring point (A), said processing means comprising;

    (i) a differential amplifier circuit (5), having a third output signal (V3), for amplifying said thermocouple output signal (V1);

    (ii) a linearization circuit, having a fourth output signal (V4), (6) for linearlizing said temperature detecting means output signal (V2);

    (iii) an amplifier circuit (7), having a fifth output signal (V5), for amplifying said linearized temperature detecting means fourth output signal (V4); and

    (iv) a buffer amplifier circuit (8) for amplifying a resultant voltage signal (V3 +V5) obtained by combining said differential amplifier third output signal (V3) and said amplifier circuit fifth output signal (V5) and outputting a sixth output signal (V6) which corresponds to the temperature at said measuring point (A); and

    transmission lead wires (M3, M'"'"'3) for connecting said reference contacts (C1, C2) with said processing means to transmit said thermocouple output signal (V1), and transmission lead wires (M6, M'"'"'6) for connecting said temperature detecting means (3) with said processing means to transmit said temperature detecting means output signal (V2).

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