Resonator device
First Claim
1. A resonator device for a transducer, the resonator device comprising:
- a resonator provided on a diaphragm with a cap enclosing the resonator and forming an optical cavity between inside surface of the cap and the resonator, to form a hermetically sealed package,wherein the resonator is arranged to be excited by applying electromagnetic stimulation,wherein the resonator is provided with a target to receive the electromagnetic stimulation, andwherein a diameter of the target is larger than a diameter of a fibre which is used to apply the electromagnetic stimulation.
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Accused Products
Abstract
A resonator device 10 is disclosed. The resonator device may be used in a transducer or a sensor such as a pressure, force or acceleration sensor. The resonator device comprises a resonator 20 provided on a diaphragm 30. A cap 40 is provided which may be fusion bonded to the diaphragm 30 to enclose the resonator 20 and form a hermetically sealed package 10. The resonator device is excited by applying electromagnetic stimulation, such as infra-red or optical stimulation, which may be from a laser via a fiber 50. The resonator device may be interrogated by applying an electromagnetic signal into the optical cavity formed between the resonator 20 and the inside surface of the cap 40 to derive a frequency change of the resonator. As the resonator device incorporates a hermetically sealed package and is stimulated by electromagnetic radiation, it is robust and able to operate in harsh environments.
32 Citations
20 Claims
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1. A resonator device for a transducer, the resonator device comprising:
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a resonator provided on a diaphragm with a cap enclosing the resonator and forming an optical cavity between inside surface of the cap and the resonator, to form a hermetically sealed package, wherein the resonator is arranged to be excited by applying electromagnetic stimulation, wherein the resonator is provided with a target to receive the electromagnetic stimulation, and wherein a diameter of the target is larger than a diameter of a fibre which is used to apply the electromagnetic stimulation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of fabricating a resonator device, the method comprising:
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providing wafers comprising a diaphragm wafer, a resonator wafer and a cap wafer; forming an optical cavity between an inside surface of the cap wafer and the resonator wafer; bonding the wafers together to form a hermetically sealed package with the resonator wafer enclosed by the diaphragm wafer and the cap wafer; arranging the hermetically sealed package to apply an electromagnetic radiation to the hermetically sealed package; and positioning a target on a surface of the resonator to receive the electromagnetic radiation, wherein a diameter of the target is larger than a diameter of a fibre which is used to apply the electromagnetic radiation. - View Dependent Claims (16)
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17. A resonator device for a transducer, the resonator device comprising:
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a resonator positioned on a diaphragm, and a cap enclosing the resonator to form an optical cavity between an inside surface of the cap and the resonator, wherein the resonator is arranged to be excited by applying an electromagnetic radiation, and wherein an electromagnetic signal, having a different wavelength than the electromagnetic radiation, is applied into the optical cavity to derive a frequency change of the resonator. - View Dependent Claims (18, 19, 20)
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Specification