Comprehensive Urban Underground Space Detection Solution Using JPMG Proton Magnetometer

Description

FAQ

Get A Quote

Description

1. Introduction

In urban environments, the complexity and diversity of underground spaces present significant challenges for infrastructure development and maintenance. As urbanization accelerates, the development and utilization of underground spaces have become an essential part of urban growth. Understanding the distribution of underground structures, buried objects, and cavities is crucial for municipal construction, infrastructure maintenance, and environmental protection. Traditional underground detection methods often involve invasiveness, high costs, and low efficiency. Therefore, utilizing efficient, non-invasive geophysical exploration techniques becomes an effective solution to these problems.

The proton magnetometer, as a high-precision geophysical exploration tool, provides accurate underground magnetic field data, helping to quickly identify underground structures and anomalies. The urban underground space detection solution based on the JPMG proton magnetometer presented in this paper can effectively address a series of challenges in urban underground space exploration, offering a high-efficiency, safe, and precise detection method.

Proton Magnetometer-4 — Proton Magnetometer

2. Solution Overview

The JPMG proton magnetometer is a tool used for detecting underground spaces by measuring the magnetic field in high precision. It detects underground objects or structures by measuring the intensity, variation, and gradient of the magnetic field. The instrument offers exceptionally high sensitivity and accuracy, making it ideal for urban environments where underground spaces are complex.

Why Choose Proton Magnetometry?

High Sensitivity: The JPMG proton magnetometer has a magnetic field measurement accuracy of ±0.1nT and a resolution as high as 0.01nT, enabling the detection of minute magnetic anomalies.
Versatility: It works effectively in complex urban environments, adapting to various natural or man-made magnetic field interferences in underground spaces.
Real-Time Data Collection and Analysis: The instrument allows for real-time data collection and direct transmission to computers or other storage devices, making it easy to analyze data on-site.

3. Key Features of the JPMG Proton Magnetometer

The JPMG proton magnetometer offers various measurement modes and incorporates several advanced technologies that provide strong support for urban underground space exploration.

3.1 High Precision and Sensitivity

The JPMG proton magnetometer can measure magnetic fields with extreme precision, with a sensitivity of up to 0.05nT. It is capable of detecting subtle magnetic anomalies, enabling the identification of buried objects or structures.

3.2 Multiple Measurement Modes

Mobile Mode: Suitable for large-scale geophysical surveys where operators can walk along measurement lines, simultaneously collecting magnetic field data and generating continuous magnetic profiles.
Base Station Mode: Ideal for long-term, stable magnetic field observation. This mode allows for continuous measurement in fixed locations, offering valuable data for diurnal corrections and long-term monitoring.
Gradient Mode: This mode measures the difference between two magnetic field readings, providing high precision for detecting underground structures. It is especially useful for identifying tunnels, pipelines, and other underground anomalies.

3.3 High-Precision GPS Integration

The JPMG proton magnetometer is equipped with high-precision GPS, allowing accurate positioning for each measurement point. This feature is crucial for data accuracy and traceability, particularly in urban environments.

3.4 Real-Time Data Transmission and Processing

The instrument supports data transmission via USB or RS-232 interfaces, enabling fast analysis and decision-making. This ensures timely access to the collected data for processing and interpretation.

4. Methodology

4.1 Survey Planning

Urban underground space exploration begins with selecting the measurement areas, focusing on known underground structures or unexplored zones. Preliminary planning can utilize existing building plans, utility maps, and other relevant documents to help identify areas of interest.

After selecting the survey areas, deploy several base stations to conduct long-term magnetic field observations, providing real-time correction values for data accuracy. Then, use the mobile measurement mode to cover the target areas and ensure comprehensive data coverage.

4.2 Data Collection

In Walking Mag (mobile) mode, operators can collect magnetic field data while walking, enabling large-scale continuous measurements. Each measurement point records the time, geographic location, magnetic field value, and signal quality, ensuring data accuracy and validity.

In specific areas, gradient mode can be used for higher precision, measuring the magnetic field variations between two distinct points, which helps identify the precise shape and distribution of underground structures.

4.3 Data Processing and Analysis

The collected data undergoes preliminary processing on-site to remove interference signals and perform diurnal corrections. Magnetic anomalies are analyzed to identify potential underground features, such as tunnels, pipelines, or voids.

Data can be further analyzed on computers, integrated with GIS (Geographic Information Systems) for spatial data visualization. This results in magnetic anomaly maps of the underground space, assisting decision-makers in understanding the distribution and structure of the underground environment.

5. Applications

5.1 Underground Utility Detection

The proton magnetometer helps identify underground infrastructure such as water pipes, gas lines, and electrical cables. It is crucial for ensuring the safety of urban construction and operation, as it allows municipal authorities to monitor and maintain utilities more effectively.

5.2 Tunnel and Void Detection

The proton magnetometer is effective in detecting underground voids, tunnels, or mine shafts. This is essential for urban underground space development, especially when constructing new buildings and infrastructure.

5.3 Archaeological Exploration

During urban construction, the proton magnetometer can be used for archaeological excavations, helping to locate buried historical structures or artifacts and prevent accidental damage to important cultural heritage sites.

5.4 Environmental Monitoring

The proton magnetometer is also valuable for monitoring changes in the urban underground environment, such as shifts in magnetic fields caused by groundwater flow or geological activity.

6. Solution Advantages

6.1 Non-Invasive and Safe

The proton magnetometer operates without disrupting the underground environment. Its non-invasive measurement method allows for precise exploration without the need for excavation or other forms of disturbance. This is especially important in urban environments where underground infrastructure is dense.

6.2 Efficiency and Large-Scale Coverage

The JPMG proton magnetometer can cover large areas rapidly, making it ideal for urban environments with complex underground structures. Its real-time data transmission and analysis allow for quick decision-making, reducing exploration time and costs.

6.3 Accurate and Reliable Data

The combination of high-precision magnetic field measurements and GPS positioning ensures reliable and accurate data. This makes the JPMG proton magnetometer an ideal tool for urban underground space exploration, capable of accurately mapping the location and distribution of underground structures.

7. Conclusion

As urbanization continues to accelerate, the development and management of underground spaces face increasing challenges. The JPMG proton magnetometer-based urban underground space detection solution offers an effective response to these challenges with its high precision, efficiency, and non-invasive capabilities. Through real-time monitoring, precise detection, and comprehensive data analysis, the proton magnetometer provides strong technical support for urban underground space exploration. With the advancement of technology, proton magnetometry will play an even more critical role in urban underground space detection in the future.

FAQ

What is the main difference between a single tap and a double tap?

What is the principle of high-density electrical prospecting?

High-density apparent resistivity method is an array prospecting method, also known as automatic apparent resistivity system, which is developed from direct current method. Its function is equivalent to the combination of quadrupole sounding and electrical profiling method. The artificial electric field is formed by supplying electricity to the underground through electrodes. The distribution of the electric field is closely related to the distribution of the resistivity of the underground rock and soil medium. By measuring the artificial electric field at different parts of the surface, the distribution of the apparent resistivity of the underground medium is understood, and the underground geological structure is inferred and interpreted based on the distribution of the apparent resistivity of the rock and soil medium.

What are the advantages of high-density electrical method?

The principle of high-density electrical method is the same as that of traditional resistivity method. It is a combination method of multiple devices and multiple pole distances that integrates electrical depth sounding and electrical profiling method, which can obtain the conductivity characteristics of two-dimensional underground media. It has the characteristics of multi-device data acquisition in one pole arrangement, and highlighting abnormal information by obtaining ratio parameters, which greatly increases the amount of collected data, improves work efficiency, and ensures the accuracy and reliability of the pole running process.

This method is particularly sensitive to the water content of the surrounding rock. If the surrounding rock is broken and contains water, its apparent resistivity is significantly reduced. The apparent resistivity of intact and hard rock and soil is significantly higher than that of the surrounding rock in the fault zone or broken zone and water-rich zone. This method has a clear principle and intuitive images. It is a geophysical method with high resolution. In recent years, with the improvement of computer data acquisition technology, the exploration efficiency has been greatly improved, the coverage area and detection depth of the profile have been increased, reliable data can be obtained in a strong interference environment, the signal-to-noise ratio has been greatly improved, and the geological body can be accurately detected. This method has been widely and successfully applied in engineering and hydrogeological exploration and exploration of mineral and water resources.

In what fields is the high-density electrical method generally used?

(1) Application in coalfield and mine goaf detection

(2) Non-destructive detection of termite nests in dam foundations

(3) Karst and foundation surveys of railways, roads and tunnels

(4) Delineation of stratum lithology boundaries

(5) Survey of the leakage range of landfills

(6) Ancient tomb surveys

(7) Detection of sewage pipes

(8) Non-destructive testing of leakage in reservoirs and river dams

(9) Detection of bedrock fracture zones

(10) Soil salinity and water quality surveys

(11) Detection of ancient tunnels, air-raid shelters, metal burial sites, etc.

What are the application characteristics of high-density electrical method?

（1）The high-density resistivity method is based on the resistivity method, so it is suitable for all underground explorations with obvious conductivity differences;

（2）Any medium underground will have a weak polarization potential at the moment of power on and off, which will affect our measurement of the true potential difference. When the electrode distance is small, the loop current is large, which has little effect on the measurement results; when the electrode distance is too large, the interference potential is close to the effective potential, which has a greater impact on the measurement results. Therefore, due to the influence of the power supply electrode distance, the exploration depth cannot be too large, generally within 100m. When the conductivity of the soil medium is good, it can be appropriately increased, and the exploration depth in the soil medium with poor conductivity is appropriately smaller;

（3）It is generally less used in cities, near large transmission lines, etc. due to site restrictions and industrial stray current interference; 4. In areas such as concrete pavements and exposed bedrock surfaces, it is also less used due to the difficulty of electrode layout.