Fiber-optic vibration sensor
AssigneeConsiglio Nazionale Delle Ricerche
InventorsGiuliano Conforti, Andrea A. Mencaglia, Mario Brenci, Anna G. Mignani
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Abstract
Vibrations of a body are measured by attaching a vibrating element to the body, directing a beam of electromagnetic energy onto the vibrating element and collecting reflected electromagnetic energy from the vibrating element. The magnitude of the reflected electromagnetic energy is processed to determine vibration and/or temperature of the body. The magnitude of the reflected light is preferably a function of second degree of the position of said vibrating element. Processing said magnitude of reflected electromagnetic energy is preferably done by a Fourier series up to a second harmonic.
Claims13
A method for measuring vibrations of a body, the method comprising the steps of:
- providing a vibratable element mechanically connected to the body;
- providing a diffusing screen on said vibratable element;
- directing a beam of electromagnetic energy onto said diffusing screen of said vibratable element;
- recording reflective portions of said beam of electromagnetic energy reflected from said vibratable element;
- determining a magnitude of said recorded reflected portions as a function of second degree of a position of said vibratable element;
- expanding said function into a Fourier series up to a second harmonic using a main vibration mode of the body as a fundamental frequency;
- and
- determining an amplitude of the vibrations of the body from harmonic components of said Fourier series.
A method for measuring vibrations of a body, the method comprising the steps of:
- providing a vibratable element mechanically connected to the body;
- providing a diffusing screen on said vibratable element;
- directing a beam of electromagnetic energy onto said diffusing screen of said vibratable element;
- recording diffusive portions of said beam of electromagnetic energy diffused from said vibratable element;
- determining a magnitude of said recorded diffused portions as a function of second degree of a position of said vibratable element;
- expanding said function into a Fourier series up to a second harmonic;
- using a main vibration mode of the body as a fundamental frequency and
- determining an amplitude of the vibrations of the body from harmonic components of said Fourier series.
A method for measuring vibrations of a body, the method comprising the steps of:
- providing a vibratable element mechanically connected to the body;
- providing a diffusing screen on said vibratable element;
- directing a beam of electromagnetic energy onto said diffusing screen of said vibratable element;
- recording portions of electromagnetic energy deffused from said diffusing screen of said vibratable element;
- determining a magnitude of said recorded portions as a function of second degree of a position of said vibratable element;
- expanding said function into a Fourier series up to a second harmonic using a main vibration mode of the body as a fundamental frequency;
- and
- determining an amplitude of the vibrations of the body from harmonic components of said Fourier series.
Dependencies are inferred from the claim text.