A highly sensitive thermal sensor is disclosed which uses a thermally isolated, thermometer cut quartz microresonator that is configured to be exposed to a radiant energy source. |
Citations|
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Claims1. A highly sensitive radiant energy sensor comprising: - a microresonator having an orientation and cut such that the microresonator has a frequency versus temperature characteristic which has a steep slope and is monotonic, wherein at least one major face of the microresonator is exposed to radiant energy;
- means to electrically excite the microresonator to produce an output frequency such that changes in radiant energy incident to the microresonator vary the output frequency; and
- means to thermally isolate the microresonator, wherein the means to thermally isolate the microresonator includes a plurality of concentric low thermal conductance rings and a plurality of sets of bridges each set of bridges connecting and supporting a selected pair of concentric rings.
2. The radiant energy sensor of claim 1 wherein each set of bridges includes three bridges which are spaced apart by approximately 120.degree.. 3. A highly sensitive radiant energy sensor comprising: - a microresonator having an orientation and cut such that the microresonator has a frequency versus temperature characteristic which has a steep slope and is monotonic, wherein at least one major face of the microresonator is exposed to radiant energy; and
- means to electrically excite the microresonator to produce an output frequency such that changes in radiant energy incident to the microresonator vary the output frequency, wherein the means to excite the microresonator includes thickness field electrodes in the shape of separated concentric rings which are disposed around the microresonator with interconnecting conductors electrically connecting and supporting the concentric rings.
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