In-Pipe Acoustic Communication Using Log Detector Amplifiers
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Solution Overview
Problem
Existing systems for monitoring the condition of mediums like water, oil, and gas in pipelines face challenges such as low sensitivity, strong pipe effects, and poor wireless communication due to the harsh environment, leading to limited transmission range and reliability.
Innovation Solution
An in-medium communication system that uses a modulated base band signal transmitted through the medium via acoustic signals, allowing sensors to be installed within the infrastructure, which can withstand pressure waves and propagate signals longitudinally, enabling reliable and efficient data transmission to a receiver for demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sensors are attached to the outside of the infrastructure (pipe), then installation is simple and cost-effective, but received sensitivity is low and transmission range is limited
Solution Approach 1:
The patent replaces electromagnetic wave-based wireless communication with acoustic wave-based communication through the medium. Acoustic waves propagate efficiently through the fluid medium itself, eliminating the need for RF signals to penetrate pipe walls and surrounding infrastructure. This substitution enables sensors to be installed within the infrastructure while achieving both high sensitivity and extended transmission range.
Solution Approach 2:
The patent utilizes the fluid medium (water, oil, gas) as the transmission channel for acoustic signals. By coupling sensors to the fluid medium and transmitting data through acoustic waves in the fluid, the system leverages the hydraulic/pneumatic properties of the medium to achieve reliable communication over long distances while maintaining sensor installation within the infrastructure.
2Ease of operation
If sensors measure vibrations transverse to the pipe, then installation is straightforward, but pipe effects (self-resonance convolution) strongly interfere with measurements
Solution Approach 1:
The patent transitions from transverse vibration measurement to longitudinal acoustic wave propagation along the pipe axis. By measuring acoustic pressure waves traveling through the fluid medium in the longitudinal direction, the system eliminates interference from transverse pipe self-resonance while maintaining simple sensor installation within the infrastructure.
3Reliability
If wireless communication is attempted through the harsh environment (submerged in water, surrounded by concrete, metal lid), then sensor protection is good, but RF propagation loss is severe (6-25 dB)
Solution Approach 1:
The patent introduces the fluid medium as an intermediary transmission channel. Instead of attempting RF propagation through pipe walls and surrounding infrastructure, acoustic waves are transmitted through the fluid medium itself, which serves as an efficient carrier for data communication. This intermediary approach eliminates severe RF propagation losses while maintaining sensor protection within the infrastructure.
4Loss of energy
If antenna is placed outside the pit above the lid, then RF transmission is improved, but antenna becomes susceptible to environmental damage, vandalism, and theft
Solution Approach 1:
The patent replaces the external RF antenna system with an acoustic communication system where sensors transmit data through acoustic waves in the fluid medium. This eliminates the need for vulnerable external antennas while achieving reliable communication, as the acoustic transmission occurs within the protected infrastructure environment.
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 solution provides an accurate, reliable, and cost-effective communication network for monitoring pipelines, improving sensitivity and range while minimizing environmental impact, allowing for efficient leak detection, flow monitoring, and pressure measurement.
Implementation Method 1
transmitting a base band signal modulated in the transmitter with the sensor received data that is then sent via an acoustic signal thru the medium
Implementation Method 2
a receiver that receives the modulated signal and demodulates the modulated signal to extract the sensor data
Data Source
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AI summary
An in-medium monitoring system for monitoring material carried within a pipe. The system includes an acoustic device installed within the pipe that generates voltage signals indicative of changes in the material, such as flow rate or leaks, a hardware unit that includes a detector module and a communication module, a switch for switching the voltage signals to and communication signals from the hardware unit. The hardware unit and a power source are attached to the pipe. The acoustic device may be detector or a sensor. The communication module may communicate date through the sensor in the medium or outside of the pipe to a fixed network. The hardware unit may include a log detection amplifier for generating an amplified pulsed output signal without voltage gain and without significantly adding noise.