Resonator temperature transducer

Details Resonator temperature transducer Resonator temperature transducer

1984-05-10

1986-06-03

Smith, Robert I.

Thermal measuring and testing

Temperature measurement

By a vibratory effect

310370, G01K 1122

Patent

active

045926638

ABSTRACT:
A vibratory temperature transducer includes a pair of elongate, generally parallel bars coupled together at one end in a type of tuning fork arrangement. The bars each have a thickness of t, a width of w and a length between free and fixed ends of L. The distance between the free end and the point where the bars are coupled together is m. Apparatus is provided to cause the bars to vibrate in torsional opposition, where the frequency of vibration is generally a function of temperature. Apparatus is also provided for determining the frequency of vibration of the bars so that when the bars are subjected to a change in temperature, the temperature can be readily determined by simply determining the magnitude of the frequency change. By careful determination of the dimensions L, m, t and w, spurious modes of oscillation of the transducer, which cause a reduction in the mechanical Q and thus an erroneous reading of temperature, are avoided.

REFERENCES:
patent: 3946257 (1976-03-01), Kawamura
patent: 4069434 (1978-01-01), Kawai et al.
patent: 4377765 (1983-03-01), Kogure et al.
patent: 4379244 (1983-04-01), Dinger
patent: 4437773 (1984-03-01), Dinger et al.
patent: 4453105 (1984-06-01), Kogure
patent: 4459042 (1984-07-01), Paros
patent: 4472655 (1984-09-01), Kawashima
patent: 4503353 (1985-03-01), Hermann

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