Multi-beam Sonar Acoustic Index Detection in Anechoic Tank
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Solution Overview
Problem
Current methods lack standardized and effective laboratory measurement techniques for multi-beam sonar apparatuses, leading to inaccuracies and credibility issues in hydrographic surveying and oceanographic research.
Innovation Solution
A device and method utilizing an anechoic tank with a rotating device and lifting gear to detect main acoustic indexes of multi-beam sonar, employing pulse sound technique to separate direct and reflected sound waves, and calculating key parameters like frequency, source level, and beam angle using specific formulas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an anechoic tank with silencers is used to eliminate sound reflections, then the acoustic measurement environment is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the harmful reflected sound waves from the measurement environment by using an anechoic tank with silencers on all surfaces. This removes the interference of reflections from sidewalls, bottom, and water surface, creating a clean free field acoustic environment for accurate multi-beam sonar measurements.
Solution Approach 2:
The anechoic tank is designed and prepared in advance with proper silencer materials and configurations before measurements are conducted. The tank dimensions and silencer placements are predetermined to ensure free field and far field conditions are met, eliminating the need for complex real-time adjustments during measurement.
2Measurement precision
If pulse sound technique is used to separate direct and reflected sound waves, then measurement accuracy is improved, but the detection time and complexity increase
Solution Approach 1:
The patent employs pulse sound technique where the multi-beam sonar emits periodic pulse signals rather than continuous waves. By controlling the pulse timing and duration, direct sound waves and reflected sound waves are separated in time domain, allowing accurate measurement of acoustic parameters without interference from reflections.
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
Ensures reliable, accurate, and credible data measurement by simulating an open water acoustic field, improving the precision and credibility of multi-beam sonar data and serving as a reference for other hydrographic instruments.
Implementation Method 1
all the surfaces of which are fully paved with silencers following the requirements of the acoustic absorption coefficient and frequency band, to eliminate the reflection of sidewall, the bottom of the tank and water surface to the incident sound wave
Implementation Method 2
the multi-beam transducer has its rotating plane perpendicular to the direction of track line and transmits signals (e.g., sound waves) along the horizontal direction
Implementation Method 3
a standard hydrophone is equipped at the bottom of the lifting gear and is connected with a signal collector for recording real time open-circuit voltage values
Data Source
AI summary
A device and a method for detecting main acoustic indexes of multi-beam sonar pertaining to the field of hydrographic surveying and charting technology. The device includes a rotating device and a lifting gear installed in an anechoic tank. The bottom of the rotating device is equipped with a multi-beam sonar that has its rotating plane perpendicular to the direction of track line and transmits signals along the horizontal direction. A standard hydrophone is equipped at the bottom of the lifting gear, and is connected with a signal collector. The device utilizes the standard hydrophone to receive the pulse signals transmitted by the multi-beam sonar and employs the multi-beam sonar to receive the standard sound source signals, designs the detection process for data collection for analysis and research, thereby achieving the detection of the frequency, source level and beam angle of multi-beam sonar.