Optical Fiber Acceleration Sensor Probe Resonance Suppression
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Solution Overview
Problem
Current optical-fiber-acceleration-sensor probes face challenges in simultaneously achieving high sensitivity and broad frequency bandwidth due to resonance issues, which distort microseismic signals and limit their effectiveness in monitoring wide-frequency-domain events.
Innovation Solution
The optical-fiber-acceleration-sensor probe incorporates a simple structure with a high damping elastomer, mass block, optical fiber interferometer, and high damping vibration absorbers, along with a nut and washer, to suppress resonance and enhance damping, allowing for accurate transient response and broad frequency bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resonance suppression is achieved by injecting silicone oil, then the resonance is suppressed, but the sealing requirement becomes high and the structure becomes complex
Solution Approach 1:
The patent extracts the silicone oil damping medium from the sensor probe structure and replaces it with a damping layer formed directly on the proof mass surface. This eliminates the need for complex sealing structures while maintaining resonance suppression functionality, directly resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The damping layer is merged with the proof mass structure, forming an integrated configuration where the damping function is built into the proof mass itself rather than being a separate component. This merging simplifies the overall structure while maintaining the resonance suppression effect.
2Measurement precision
If the damping of the probes is controlled to ensure high sensitivity, then the sensitivity is improved, but the working frequency bandwidth becomes narrow
Solution Approach 1:
The patent changes the damping parameter by using a damping layer with specific material properties (loss factor between 0.05-0.5) and controlled thickness (0.1-10 times the proof mass dimension). This optimized parameter selection allows the system to achieve high sensitivity while maintaining a broad working frequency bandwidth, resolving the contradiction between measurement precision and adaptability.
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
This configuration ensures high sensitivity and broad frequency bandwidth, enabling accurate hypocenter location and energy measurement for microseismic events, suitable for diverse rock-soil environments and mine dynamic disaster monitoring.
Implementation Method 1
an optical fiber interferometer arranged in the mass block, and the optical fiber interferometer including a sensing arm and a reference arm, where the sensing arm is wound around the high damping elastomer, and the reference arm is wound around the mass block
Implementation Method 2
a high damping elastomer sleeved on the double-end stud; a mass block sleeved on the double-end stud and located on the high damping elastomer
Implementation Method 3
high damping vibration absorbers located on the mass block
Data Source
AI summary
An optical-fiber-acceleration-sensor probe is provided, which includes a probe shell having a threaded hole at a bottom thereof and an optical-fiber entry and exit hole on a side thereof; a double-end stud in the probe shell, an end of the double-end stud being connected to the threaded hole; a high damping elastomer sleeved on the double-end stud; a mass block sleeved on the double-end stud and located on the high damping elastomer; an optical fiber interferometer located in the mass block and including a sensing arm and a reference arm, where the sensing arm is wound around the high damping elastomer, and the reference arm is wound around the mass block; high damping vibration absorbers on the mass block; and a nut located at another end of the double-end stud, and on the high damping vibration absorbers, where a washer is between the nut and the high damping vibration absorbers.