Device for improved response when measuring vibration frequency of a vibrating object
AssigneeSondero AB
InventorCarl Tyren
Life of this patent
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Abstract
A device for measuring a vibration frequency of a mechanically vibrating string or rod, comprising a microwave transmitter for directing microwaves towards the vibrating string and a microwave receiver for receiving the microwaves amplitude modulated by the frequency of mechanical vibration. A member is arranged close to a vibration maximum of the vibrating string. The member is arranged on one side of the vibrating object and the microwave receiver is arranged on the other side thereof. The device is used for measuring temperature, pressure, torque, force or identity.
Claims19
A device for measuring a vibration frequency of a mechanically vibrating object, such as a string or rod, of an electrically conducting material, comprising
- a microwave transmitter for directing microwaves towards the vibrating object and a microwave receiver for receiving said microwaves amplitude modulated by said frequency of vibration,
- characterized by
- a member of an electrically conducting material arranged adjacent a vibration maximum of said vibrating object, in order to increase said amplitude modulation;
- said member being arranged at a distance which is smaller than about 3%, such as smaller than about 1%, for example smaller than 0.3% of the wavelength of the microwaves.
Dependencies are inferred from the claim text.