Acoustic Detector Control via Power Spectrum Pattern Recognition
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Solution Overview
Problem
Current gas leak detectors in hazardous industrial environments face challenges with maintenance access, inconsistent magnetic switching, and electromagnetic interference, limiting their effectiveness in controlling operations remotely.
Innovation Solution
A control system for acoustic detectors that uses a memory to store a reference power spectrum, receives acoustic signals with tones and harmonics, and initiates operations based on pattern recognition through a normalized mean squared error comparison, allowing for remote and reliable control without line of sight or close proximity requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If magnetic switching with Hall Effect sensors is used to control acoustic detectors, then control operations can be performed without direct contact, but the switching becomes inconsistent due to ferrous components diverting magnetic flux and requiring close proximity to generate sufficient magnetic field
Solution Approach 1:
The patent replaces magnetic field-based control (mechanical/electromagnetic system) with acoustic wave-based control (acoustic system). The acoustic detector uses a microphone to receive acoustic waves, and the processor identifies control commands through pattern recognition of power spectrum characteristics. This substitution eliminates the problems of magnetic flux diversion by ferrous components and the requirement for close proximity, as acoustic waves can penetrate non-magnetic materials and travel longer distances without significant attenuation.
2Ease of operation
If optical technology is used to control acoustic detectors, then remote control is enabled, but line of sight to the detector is required which limits control flexibility
Solution Approach 1:
The patent replaces optical control (requiring line of sight) with acoustic wave control. Acoustic waves can diffract around obstacles and penetrate through non-magnetic materials, eliminating the line-of-sight requirement while maintaining remote control capability. This provides greater adaptability and versatility in controlling acoustic detectors in various installation environments.
3Ease of operation
If RF controls are used for remote operation of acoustic detectors in hazardous environments, then wireless control is achieved, but electromagnetic interference and radiated energy in combustible gas environments create safety challenges
Solution Approach 1:
The patent replaces RF electromagnetic control with acoustic wave control. Acoustic waves are mechanical vibrations that propagate through the air or other media, not electromagnetic waves. This substitution eliminates electromagnetic interference and radiated energy issues in hazardous environments, while still enabling wireless remote control operation. The acoustic waves used for control are at audible or ultrasonic frequencies that do not pose ignition risks in combustible gas environments.
4Reliability
If acoustic detectors are deployed high on bulkheads, framework, ceiling structures, or poles to optimize monitoring coverage, then detection coverage is improved, but maintenance and operation personnel must climb ladders or scaffolds creating safety risks
Solution Approach 1:
The patent replaces the need for physical access to the acoustic detector for control operations with acoustic wave-based remote control. The acoustic waves can be transmitted to the detector from a distance without requiring personnel to physically approach or touch the device. This allows detectors to be installed in optimal positions for detection coverage (high on bulkheads, framework, ceiling structures, or poles) while eliminating the safety risks associated with climbing ladders or scaffolds for maintenance and operation.
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
Enables reliable and safe remote control of acoustic detectors in hazardous environments by accurately recognizing control signals through unique acoustic patterns, reducing maintenance risks and electromagnetic interference issues.
Implementation Method 1
Gas leak detectors utilizing acoustic detection have been devised to measure the airborne sound pressure waves generated by the turbulent flow when a gas escapes from a high to a low pressure
Implementation Method 2
The acoustic detector initiates a control function based on valid pattern recognition of the acoustic power spectrum (or sound pressure level) generated by the unique tone or a multiplicity of tones and its harmonic components
Data Source
AI summary
A method of controlling a function of an acoustic detector includes storing a reference power spectrum of a reference acoustic signal, the reference power spectrum being associated with a mode of operation of the acoustic detector; receiving an acoustic sound signal, the acoustic sound signal including a tone and harmonic tones; generating a real-time acoustic power spectrum of the acoustic sound signal responsive to the receiving of the acoustic sound signal; and performing the mode of operation when a comparison of the real-time acoustic power spectrum with the reference acoustic power spectrum indicates that the acoustic sound signal is a control signal.