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Resonator temperature transducer

  • US 4,592,663 A
  • Filed: 05/10/1984
  • Issued: 06/03/1986
  • Est. Priority Date: 05/10/1984
  • Status: Expired due to Term
First Claim
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1. A resonator temperature transducer comprisinga pair of elongate, spaced-apart, generally parallel bars coupled together at one end, said bars each having a thickness t and width w, with the distance from the location at which the bars are coupled together to the free ends of the bars being m, and said bars being made of a material so that when the bars are caused to vibrate in the torsional mode, the frequency of vibration varies as a function of temperature,an enlarged mounting section formed integral with the bars at said one end, with the distance from the mounting section to the free ends of the bar being L,means for causing said bars to vibrate in the torsional mode 180°

  • out of phase at a frequency fT, andwherein t, w, m and L are selected so that ##EQU5## where Aan =3.05, 18.99, 51.92 for n=1, 2 and 3Abn =8.57, 41.82, 96.97 for n=1, 2 and 3Apn =3.91, 22.12, 59.09, 114.1, 189.9, 281.8 for n=1, 2, 3, 4, 5 and 6Awn =4.96, 30.91, 71.82, 89.80, 143.4, 180.8 for n=1, 2, 3, 4, 5 and 6 ##EQU6## fan, fpn, fbn and fwn are the frequencies of vibration of spurious modes of the transducer, where n is the order of the mode, P is the density of the material and S55 and S66 are shear compliances and E is Young'"'"'s Modulus of the material.

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