Device for measuring vibration amplitude
Patent 4218614 Issued on August 19, 1980. Estimated Expiration Date: 
June 8, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 8, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorAssigneeApplicationNo. 05/913774 filed on 06/08/1978US Classes:250/231.1, Actuated by dynamic external physical quantity73/655With light beam indicatorExaminersPrimary: Nelms, David C.Attorney, Agent or FirmInternational ClassG01H 9/00 (20060101)AbstractA device is provided for measuring the amplitude of vibration of a vibratory element. The vibratory element or reed has a vane attached to it extending between opposed fiber optics light guides. The vane has a mask portion which has slits forming alternating light-transmitting elements and opaque elements uniformly spaced in the direction of movement of the vane and lying in the path of light between the light guides. One of the light guides has a stationary mask with at least one slit corresponding in size and orientation to those of the vane. When light is transmitted from one of the light guides to the other while the vibratory member is vibrating, the light must pass through the slits of the masks and is alternately transmitted and cut off. By counting the number of minimum light transmissions, therefore, the amplitude of the vibration can be determined. | |
