Method for measuring oscillation frequency and oscillation frequency measuring device

Abstract

The invention provides a method for measuring oscillation frequency. The method comprises: the change of scattered light is transmitted to a photomuitplier specially used for photon counting through optical fiber when objects vibrate, the photomuitplier transforms optical signals into electrical signals, and then the electrical signals are transmitted to a photoelectric pulse counter; data output by the photoelectric pulse counter is transmitted to a data processing computer, and the data processing computer utilizes a photon correlation method to process the data; after that, the data is transformed by Fourier, so that power spectrum image and data of oscillation frequency distribution can be obtained.

Description

Technical field: [0001] The invention relates to a measuring method, especially a method for measuring vibration frequency. Background technique: [0002] In the prior art, the known technology is Patent No. 02103972.0 authorized by the Patent Office of the State Intellectual Property Office, which discloses a technical solution of "vibration measuring device with optical fiber detector". The working principle of this scheme is that when the optical fiber is subjected to external vibrations, the refractive index gradient inside the optical fiber changes, resulting in changes in the reflection and diffraction of the light beam in the optical fiber, resulting in changes in the light intensity passing through the optical fiber. Vibration data can be measured by detecting changes in this light intensity. Utilizing this principle, the scheme adopts the method of winding the optical fiber on an inductive object, the laser is injected at the light-incoming end of the optical fiber...

AI Technical Summary

Problems solved by technology

Utilizing this principle, the scheme adopts the method of winding the optical fiber on an inductive object, the laser is injected at the light-incoming end of the optical fiber, and the light-emitting end of the optical fiber is received by a photosensitive diode, which is output after current and voltage conversion and amplification, while The sensing object is placed on the vibrating object. Therefore, this solution is a contact measurement method, and one of the problems in the contact measurement is that the detection device should be fixed on the vibrating object, which is difficult for smaller objects. It will change its mechanical properties, and the measured vibration data will be distorted, so this scheme is only suitable for large objects, not for the measurement of vibration of smaller objects, which is the deficiency of the existing technology

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