ApplicationNo. 05/913774 filed on 06/08/1978
US Classes:250/231.1, Actuated by dynamic external physical quantity73/655With light beam indicator
ExaminersPrimary: Nelms, David C.
Attorney, Agent or Firm
International 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.