Underwater Communication Device Using Field Effect Transistor
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Solution Overview
Problem
Existing underwater communication methods face challenges with high directivity of laser signals, making them difficult to apply to mobile communication due to the need for precise alignment between transmitters and receivers.
Innovation Solution
An underwater communication device utilizing a field effect transistor with a channel region in contact with water and a drive circuit to generate a potential difference between the source and drain regions, allowing for isotropic signal dispersion and reception without precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If laser is used for underwater communication, then transmission distance is improved, but alignment precision requirement increases
Solution Approach 1:
The patent changes the fundamental parameter of signal propagation from directional (laser) to isotropic (electric field), allowing the receiver to detect signals from any direction without requiring precise alignment while maintaining effective transmission distance through the water medium
2Loss of information
If laser is used for underwater communication, then transmission capacity is improved, but ease of operation deteriorates
Solution Approach 1:
The patent transitions from optical signal detection to electrical field detection, fundamentally changing the operational mechanism. The electric field signal disperses isotropically in water, enabling mobile communication operations without complex alignment procedures while maintaining transmission capacity through the water medium
3Length of stationary object
If sound waves are used for underwater communication, then transmission distance is improved, but transmission speed deteriorates
Solution Approach 1:
The patent replaces the mechanical wave propagation mechanism (sound waves) with an electrical field-based signal transmission mechanism. Electric field signals propagate through water at speeds much closer to the speed of light while maintaining the ability to transmit over distance through the conductive water medium
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 effective and mobile underwater communication by minimizing signal attenuation and allowing for accurate signal reception over distances, even when the transmitter and receiver are not aligned, thus facilitating communication with moving objects.
Implementation Method 1
a transmitter configured to transmit an electric signal; and a receiver arranged away from the transmitter via water and configured to receive the electric signal
Data Source
AI summary
The invention is to provide an underwater communication device and an underwater communication method that can be applied to mobile communication in water. An underwater communication device 10 includes: a transmitter 12 configured to transmit an electric signal; and a receiver 14 arranged away from the transmitter 12 via water and configured to receive the electric signal, in which the receiver 14 includes an field effect transistor 23 having a channel region 39 provided at a position in contact with the water, and a drive circuit 26 configured to generate a potential difference between a source region 31 and a drain region 33 of the field effect transistor 23.