Laser vibrometer and vibration measurement method
The laser vibrometer addresses the complexity and cost issue of conventional systems by using a single frequency shifter with orthogonal polarizations for signal and reference light, enabling efficient and cost-effective multiple location measurements.
JP2025128971APending Publication Date: 2025-09-03OKI ELECTRIC INDUSTRY CO LTD
Patent Information
- Application Number
- JP2024026045
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-02-22
- Publication Date
- 2025-09-03
AI Technical Summary
Technical Problem
Conventional laser vibrometers require multiple frequency shifters for simultaneous measurements at multiple locations, leading to a complex system and high costs due to the need for separate optical paths for signal and reference light.
Method used
A laser vibrometer design that uses a single frequency shifter by arranging it before the optical fiber, with signal and reference light propagated with orthogonal polarizations, allowing for simultaneous measurements at multiple locations using a single shifter.
Benefits of technology
Mitigates disturbances and simplifies the system design while reducing costs by using a single frequency shifter for multiple location measurements, maintaining accurate vibration measurements.
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Smart Images
Figure 2025128971000001_ABST
Abstract
To allow disturbances to be alleviated with one frequency shifter even when measurements are taken at a plurality of locations.SOLUTION: A laser vibrometer includes: a light source unit that has a continuous light source that generates continuous light and generates combined light obtained by combining first light and second light that have different frequencies and orthogonal polarization directions; an optical fiber; a sensor head unit that branches the combined light received through the optical fiber into illumination light and reference light that have different frequencies and orthogonal polarization directions, irradiates a measurement object with the illumination light, receives return light that is formed by the illumination light being reflected or scattered by the measurement object, and combines the illumination light and the return light with the reference light to generate returned combined light; and a receiving unit that extracts polarization in a specific direction of the returned combined light, acquires the return light and the reference light, and acquires vibration information from interference light between the return light and the reference light.SELECTED DRAWING: Figure 1
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Citation Information
Patent Citations
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Vibration meter and vibration measuring method
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