Buried Metal Detection via Wireless Sync Signal Segmentation
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Solution Overview
Problem
Current methods for detecting buried metals, such as the CD wave and synchronous detection methods, face limitations in frequency band usage, leading to interference, waveform distortion, and reduced detection efficiency, especially for buried metal tubes with curved or branched configurations and low conductivity materials like gas or water pipes.
Innovation Solution
The method employs a synchronous detection system where a standard signal is divided to create a transmitting signal and a synchronizing signal, with the synchronizing signal transmitted via radio, allowing for higher frequency usage beyond conventional radio frequency limitations, enabling longer detection distances and improved accuracy by processing the amplitude and phase of the magnetic field generated by the transmitting signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the frequency of the transmitting signal is increased to improve detection distance and efficiency, then detection distance and efficiency are improved, but radio frequency limitations and interference occur
Solution Approach 1:
The frequency band is segmented into two distinct components: a low-frequency radio-transmittable synchronizing signal (300-3000 Hz) for reliable wireless transmission, and a high-frequency transmitting signal (above limited frequency band) for enhanced detection performance. This segmentation allows each signal to operate in its optimal frequency range without mutual interference.
Solution Approach 2:
The synchronizing signal acts as an intermediary that carries frequency information from the transmitting side to the receiving side via radio. The receiving device uses this intermediary signal to generate a reference signal that matches the transmitting signal's frequency characteristics, enabling coherent detection without direct high-frequency radio transmission.
2Measurement precision
If the synchronous detection method is used to improve detection accuracy, then detection accuracy is improved, but the frequency band is limited by radio transmission constraints
Solution Approach 1:
The system dynamically changes the frequency parameter of the transmitting signal beyond conventional radio limits while maintaining synchronizing signal transmission within standard radio bands. The receiving device adapts its reference signal frequency based on the synchronizing signal, enabling accurate detection across extended frequency ranges.
3Productivity
If the transmitting signal frequency is raised above the limited frequency band to detect low conductivity materials, then detection efficiency for low conductivity materials is improved, but radio transmission becomes unreliable
Solution Approach 1:
The signal transmission is segmented into two functional parts: the synchronizing signal transmitted via reliable radio channels at low frequencies, and the high-frequency transmitting signal applied to the buried metal. This allows the system to achieve high detection efficiency for low conductivity materials while maintaining reliable communication through the separate low-frequency synchronizing channel.
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 approach extends detection distance, reduces the need for physical connections between transmission and reception points, and maintains high detection efficiency even for buried metal tubes with low conductivity, allowing for flexible frequency settings to optimize damping and phase characteristics.
Implementation Method 1
The detection principle of this pipe locator is as follows. As shown in FIGS. 5(a)-(c), if an alternating current is passed through metal tubes 51 currently buried underground 50, the magnetic field (magnetic field H) of the shape of a concentric circle centering on this metal tube 51 will occur
Implementation Method 2
This magnetic field H is detected with magnetic sensor 52a of the receiver which is on the ground
Implementation Method 3
transmitting this synchronizing signal from the transmitting side device by radio
Implementation Method 4
m multiplying this received synchronizing signal to convert it to the standard signal, n dividing this converted standard signal to convert it to a reference signal of frequency f/n
Data Source
AI summary
To provide a method and device for detecting buried metal, whereby it is possible to radio (wirelessly) transmit a synchronizing signal, and, when the frequency band of the transmission signal is restricted, to problem synchronous detection using a reference signal having a frequency equal to or greater than the frequency band. A method for detecting buried metal using synchronous detection method having a transmitting side device that transmits a transmitting signal (alternating current) to a buried metal for detection and transmits a synchronizing signal for synchronous detection, and a receiving side device for measuring the position and burial depth of the buried metal by detecting a magnetic field generated by the transmitting signal flowing in the buried metal with a magnetic sensor and processing amplitude and phase of the magnetic field, the method including: generating a standard signal of frequency f in the transmitting side device, and n dividing this standard signal to convert it to a transmitting signal of frequency f/n, transmitting this transmitting signal to the buried metal, m dividing the standard signal to convert it to a synchronizing signal of frequency f/m, transmitting this synchronizing signal from the transmitting side device by radio. Receiving the synchronizing signal by the receiving side device, m multiplying this received synchronizing signal to convert it to the standard signal. N dividing this converted standard signal to convert it to a reference signal of frequency f/n. Detecting a magnetic field generated by the transmitting signal flowing in the buried metal and synchronously detecting with the reference signal.