Fiber Bragg Grating Tuner for String Instruments
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Solution Overview
Problem
Current tuning methods for stringed instruments are subjective and prone to errors due to background noise and electromagnetic interference, affecting the accuracy of pitch detection.
Innovation Solution
A fiber optic music tuner with a prewritten fiber Bragg grating connected to a light source and detector, which measures frequency changes in the string vibrations to provide objective and accurate tuning, minimizing the impact of noise and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic tuners are used to detect frequency, then frequency detection capability is improved, but the system becomes susceptible to background noise, distortion, and electromagnetic interference
Solution Approach 1:
The patent replaces electronic frequency detection systems with an optical measurement system using fiber Bragg grating sensors. The FBG sensor detects string vibration frequency through optical wavelength shifts caused by mechanical strain, eliminating susceptibility to electromagnetic interference while maintaining measurement precision.
Solution Approach 2:
The patent introduces an optical fiber with Bragg grating as an intermediary element between the string vibration and the detection system. This intermediary converts mechanical vibrations into optical wavelength changes, providing isolation from electromagnetic noise while preserving frequency information.
2Object-affected harmful factors
If tuning forks are used as frequency standards, then no electromagnetic interference is involved, but the method relies on subjective human ear discrimination which reduces measurement precision
Solution Approach 1:
The patent replaces subjective human ear discrimination with an optical measurement system. The FBG sensor objectively measures frequency by detecting wavelength shifts in reflected light, eliminating human subjectivity while maintaining immunity to electromagnetic interference.
Solution Approach 2:
The patent uses optical reflection from the Bragg grating to create a measurable copy of the vibration frequency information. The reflected light wavelength directly corresponds to the string frequency, providing an objective, measurable representation that eliminates subjective interpretation.
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 offers more precise instrument tuning by objectively measuring frequency changes, reducing errors caused by subjective listening and environmental interference, resulting in improved tuning accuracy.
Implementation Method 1
a fiber optic with a prewritten fiber Bragg grating... a reflector constructed in a short segment of optical fiber that reflects particular wavelengths of light and transmits all others
Data Source
AI summary
The present invention relates an instrument tuner possessing a fiber optic with a prewritten fiber Bragg grating. The tuner is suitable for providing more accurate instrument tuning, capable of not being subject to a tuner's subjectivity or distortions or electromagnetic interference.