Passive frequency stabilization in an acoustic resonator
OwnerSteven L. Garrettinventor
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Abstract
The resonance frequency of a gas-filled acoustic resonator (12) is stabilized against changes in frequency due to changes in the temperature of the gas and resonator (12) by placing a gas mixture and an adsorbent (16) within the resonator (12). If the temperature dependence of the adsorbency is different for the different species comprising the gas mixture, then it is shown that the proper amount of adsorbent (16) can maintain the acoustic resonant frequency of the gas mixture within resonator (12) very nearly equal to a constant frequency.
Claims12
An apparatus having a temperature stabilized acoustic resonant frequency at a first and a second temperature, the apparatus comprising:
- an acoustic resonator having a cavity;
- a mixture of two or more gases contained within said cavity;
- and
- an adsorbent material in fluid contact with said gases, the adsorbency of said adsorbent material having a temperature dependence which is a different function of temperature for each of said two or more gases.
A method for providing an acoustic resonator having a temperature stabilized acoustic resonant frequency at a first and a second temperature, the method comprising the steps of:
- a. providing an acoustic resonator having a cavity;
- b. disposing a mixture of two or more gases within said cavity;
- c. disposing an adsorbent material in fluid contact with said gases, the adsorbency of said adsorbent material having a temperature dependence which is a different function of temperature for each of said two or more gases.
Dependencies are inferred from the claim text.