Ring Laser Resonator with Phase-Shifted Fiber Bragg Grating for Vibration Detection
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Solution Overview
Problem
Existing vibration detection techniques face challenges in achieving a good Signal-to-Noise-Ratio (SNR) for detecting vibrations, ultrasound, and acoustic emissions.
Innovation Solution
A vibration detection apparatus and method utilizing a ring laser resonator and a phase-shifted fiber Bragg grating (PS-FBG) that generates a laser beam propagating a ring-shaped light path, where the PS-FBG's transmittance distribution changes with object vibrations, allowing for effective detection of vibrations based on the transmitted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional vibration detection techniques are used, then the detection system can identify vibrations, but the Signal-to-Noise-Ratio (SNR) is insufficient
Solution Approach 1:
The patent utilizes mechanical vibration principles by employing a ring laser resonator that generates a laser beam propagating in a ring-shaped light path. The fiber Bragg grating is positioned to interact with this laser beam, and its transmittance distribution changes in response to vibrations of the object being measured. This mechanical vibration interaction enables high-precision detection with improved SNR.
Solution Approach 2:
The invention applies parameter changes by using a fiber Bragg grating whose transmittance distribution characteristic in the wavelength direction dynamically changes according to the vibration of the object. This parameter change (transmittance distribution) is directly correlated with the vibration amplitude and frequency, enabling precise measurement of vibration characteristics with high SNR.
2Productivity
If conventional detection methods are used, then vibrations can be detected, but the measurement time and number of measurements required are excessive
Solution Approach 1:
The ring laser resonator continuously generates a laser beam that propagates in a ring-shaped light path, creating a continuous optical field for vibration detection. The fiber Bragg grating continuously modulates the transmittance distribution in response to object vibrations, enabling continuous measurement without interruption. This continuous action allows for rapid data acquisition with high measurement efficiency while maintaining detection accuracy.
3Measurement precision
If conventional techniques are used, then general vibrations can be detected, but low-energy vibrations such as acoustic emissions in composite materials cannot be detected
Solution Approach 1:
The ring laser resonator generates a stable, high-intensity laser beam that continuously interacts with the fiber Bragg grating. This mechanical vibration system is highly sensitive to even minimal vibrations, enabling detection of low-energy events such as acoustic emissions in composite materials. The resonant nature of the ring laser amplifies the interaction between the light and the grating, lowering the energy threshold for detectable vibrations.
Solution Approach 2:
The fiber Bragg grating exhibits dynamic changes in its transmittance distribution characteristic in the wavelength direction in direct response to vibration. This parameter change is highly sensitive to even minute vibrations, allowing the system to detect low-energy vibrations such as acoustic emissions. The transmittance modulation provides a direct, sensitive measure of vibration amplitude and frequency with excellent detection sensitivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides high accuracy and sensitivity in detecting vibrations with improved SNR, reducing measurement time and number of measurements, and is capable of detecting low-energy vibrations, such as those from acoustic emissions in composite materials.
Implementation Method 1
a ring laser resonator which generates a laser beam propagating a ring-shaped light path
Implementation Method 2
ring laser resonator generates a laser beam propagating a ring-shaped light path
Implementation Method 3
a fiber Bragg grating which has a transmittance distribution characteristic of transmitted light in a wavelength direction, and changes in accordance with vibration of an object
Data Source
AI summary
A vibration detection apparatus includes a ring laser resonator, a fiber Bragg grating and a detection system. The ring laser resonator generates a laser beam propagating a ring shaped optical path. The fiber Bragg grating is disposed in the ring laser resonator such that the laser beam enters the grating, and has a transmittance distribution characteristic of transmitted light in a wavelength direction, which changes in accordance with vibration of an object. The detection system detects the vibration based on the transmitted light through the fiber Bragg grating.