Dual-Pulse Underwater Detection Device for Fish and Sediment Analysis
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Solution Overview
Problem
Conventional fish finders face difficulties in accurately detecting fish and discriminating sea bottom sediment types at deep depths due to the shorter transmission pulse width of ultrasonic waves, which results in reduced energy and detectable distance range.
Innovation Solution
A fish finder device that generates and transmits ultrasonic waves with different pulse widths for fish detection and sea bottom sediment discrimination, using a shorter pulse width for high-resolution fish detection and a longer pulse width for stronger energy and longer detection range, allowing both functions to be performed by a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a shorter transmission pulse width is used for fish detection, then distance resolution is improved, but ultrasonic wave energy decreases and detectable distance range shrinks
Solution Approach 1:
The patent divides the detection function into two separate systems: a first ultrasonic detection system with short pulse width for fish detection (high resolution) and a second ultrasonic detection system with long pulse width for bottom sediment discrimination (high energy). This segmentation allows each system to be optimized for its specific purpose without compromise.
Solution Approach 2:
The patent creates a multi-functional detection device that can perform both fish detection and bottom sediment discrimination using the same hardware platform but with different pulse width configurations. The device universally handles multiple detection tasks by switching between optimized pulse parameters.
2Measurement precision
If a shorter transmission pulse width is used for fish detection, then distance resolution is improved, but detectable distance range decreases
Solution Approach 1:
The patent segments the detection range into two specialized systems: the first system with short pulse width for close-range fish detection with high resolution, and the second system with long pulse width for long-range bottom sediment detection. This allows the device to achieve both high resolution at close range and long detection range through appropriate system selection.
3Use of energy by moving object
If a longer transmission pulse width is used for bottom sediment discrimination, then ultrasonic wave energy increases and detection range extends, but distance resolution decreases
Solution Approach 1:
The patent assigns the long pulse width configuration specifically to the bottom sediment discrimination function, accepting that distance resolution is not critical for this application. The first detection system uses short pulse width for fish detection where resolution matters, while the second system uses long pulse width for bottom sediment analysis where energy and range are more important.
4Device complexity
If a single transmission pulse width is used for both fish detection and bottom sediment discrimination, then device complexity is reduced, but detection accuracy for both functions deteriorates
Solution Approach 1:
The patent implements a dynamic configuration system where the transmission pulse width can be changed based on the detection task. The control unit dynamically switches between first and second transmission signals with different pulse widths, allowing optimal detection accuracy for each function while maintaining a unified device structure.
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 accurate detection of fish and discrimination of sea bottom sediment types at deeper depths with improved distance resolution and signal-to-noise ratio, extending the detectable range and enhancing the accuracy of both fish detection and sediment analysis.
Implementation Method 1
a transducer for transmitting underwater ultrasonic waves based on the first and second transmission signals, respectively
Implementation Method 2
receiving the reflection waves caused by the ultrasonic waves, respectively
Data Source
AI summary
This disclosure provides an underwater detection device, which includes a first generator for generating a first transmission signal, a second generator for generating a second transmission signal having a longer pulse width than that of the first transmission signal, an output unit for outputting the transmission signals generated by the first and second generators to a transducer for transmitting underwater ultrasonic waves based on the first and second transmission signals, respectively, receiving the reflection waves caused by the ultrasonic waves, respectively, and converting the reflection waves into a first reception signal and a second reception signal, respectively, an underwater detector for detecting at least one of a presence of a target object and a water bottom depth based on the first reception signal, and a bottom sediment discriminator for discriminating a water bottom sediment type based on the second reception signal.