Dual mode quartz thermometric sensing device

Details Dual mode quartz thermometric sensing device Dual mode quartz thermometric sensing device

1983-04-20

1989-10-10

Steinberger, Brian S.

Thermal measuring and testing

Temperature measurement

By a vibratory effect

310318, 331116R, H01L 4110

Patent

active

048727652

ABSTRACT:
A circuit is shown for representing the internal temperature of a crystal, through a combination of certain harmonic frequencies excited in that crystal. By forming a signal which is equal to nF.sub.A -F.sub.B, i.e., n times a lower harmonic frequency minus F.sub.B, an nth harmonic frequency, or F.sub.A -1
F.sub.B, e.g., it is possible to have a signal which is near linearly dependent upon temperature which can be used in representing same. This composite signal is also seen to be highly sensitive to temperature changes yielding an improved thermometric system as compared to conventional systems.

REFERENCES:
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patent: 4079280 (1978-03-01), Kusters et al.
patent: 4159622 (1979-06-01), Akahane
patent: 4160183 (1979-07-01), Kusters et al.
patent: 4233843 (1980-11-01), Thompson et al.
patent: 4325036 (1982-04-01), Kuwabara
patent: 4345221 (1982-08-01), Zumsteg
patent: 4415870 (1983-11-01), Zumsteg
patent: 4468634 (1984-08-01), Takagi et al.
Bottom, Virgil E. Introduction to Quartz Crystal Unit Design Chapt. 8, Frency Constants . . . Van Nostrand Reinhold Company, pp. 134-137, 1982.

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