Method of adjusting resonant frequency of a coupling resonator
First Claim
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1. A method of adjusting the resonant frequency of a resonator having a plurality of coupled vibrational modes which comprises the steps of:
- measuring the resonant frequency of the fundamental vibration at a plurality of different temperatures;
calculating a frequency-temperature coefficient of the first order α
by use of said different temperatures and respective resonant frequencies of the fundamental vibration;
adding weights to or removing weights from the vibrational portion of the resonator at a first predetermined portion thereof so as to adjust the first order temperature coefficient α
to almost zero; and
thereafter adding weights to or removing weights from the vibrational portion at a second predetermined portion thereof so as to adjust the resonant frequency of the fundamental vibration in such manner that the frequency-temperature coefficient of the first order α
hardly shifts.
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Abstract
Each resonant frequency of a coupling resonator is measured at a plurality of each different temperatures. From these values the first order temperature coefficient α is calculated. According to the value of α, it is accurately adjusted and finally the resonant frequency of a fundamental vibration is also adjusted to a nominal frequency.
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Citations
13 Claims
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1. A method of adjusting the resonant frequency of a resonator having a plurality of coupled vibrational modes which comprises the steps of:
- measuring the resonant frequency of the fundamental vibration at a plurality of different temperatures;
calculating a frequency-temperature coefficient of the first order α
by use of said different temperatures and respective resonant frequencies of the fundamental vibration;
adding weights to or removing weights from the vibrational portion of the resonator at a first predetermined portion thereof so as to adjust the first order temperature coefficient α
to almost zero; and
thereafter adding weights to or removing weights from the vibrational portion at a second predetermined portion thereof so as to adjust the resonant frequency of the fundamental vibration in such manner that the frequency-temperature coefficient of the first order α
hardly shifts. - View Dependent Claims (2, 3, 4, 5)
- measuring the resonant frequency of the fundamental vibration at a plurality of different temperatures;
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6. A method of adjusting the resonant frequency of a resonator having a plurality of vibrational modes which comprises the steps of:
- setting the resonator at an arbitrary temperature t1 ;
measuring the resonant frequency f1 of a fundamental vibration of the resonator at the arbitrary temperature t1 ;
thereafter setting the resonator at another temperature t2 ;
measuring the resonant frequency f2 of said fundamental vibration at the temperature t2 ;
calculating a frequency-temperature coefficient of the first order α
by use of the temperatures t1, t2 and the respective resonant frequencies f1, f2 ;
adding weights to or removing weights from the vibrational portion of the resonator at locations effective to adjust the first order temperature coefficient α
to almost zero; and
thereafter adding weights to or removing weights from the vibrational portion of the resonator at predetermined portions thereof effective to adjust the resonant frequency of the fundamental vibration in such manner that the frequency-temperature coefficient of the first order α
hardly shifts.
- setting the resonator at an arbitrary temperature t1 ;
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7. A method for adjusting the resonant frequency of a coupling resonator comprising the steps of:
- providing a coupling resonator having a resonant portion vibratable in at least two coupled together modes of vibration including a fundamental mode and a sub mode;
adjusting the first order frequency-temperature coefficient of the resonator to near zero by the addition of reduction of weights on the resonant portion; and
thereafter adjusting the resonant frequency of the fundamental mode of vibration by the addition or reduction of weights on the resonant portion without significantly disturbing the previously adjusted first order frequency-temperature coefficient. - View Dependent Claims (8, 9, 10, 11, 12, 13)
- providing a coupling resonator having a resonant portion vibratable in at least two coupled together modes of vibration including a fundamental mode and a sub mode;
Specification