The micro mine directional sensor is a core component for achieving high-precision spatial positioning and attitude measurement in mining engineering. By integrating sensing technology and intelligent algorithms, it provides critical data support for mine exploration, mining, support, and equipment navigation. Taking the DS550LT-A micro directional sensor developed by ZITN as an example, this paper elaborates on its working principle, technical characteristics, and industry applications from three aspects.
Working Principle: Multi-sensor Fusion and Spatial Calculation
The core measurement principle of this type of sensor is based on the "magnetic direction finding + acceleration attitude determination" fusion method, which relies on the collaborative operation of the built-in three-axis magnetic sensor (fluxgate) and three-axis MEMS acceleration sensor:
Magnetic Sensor: Measures the components of the Earth's magnetic field on each axis to determine the sensor's direction relative to magnetic north.
Acceleration Sensor: Measures the components of gravitational acceleration on each axis to determine the sensor's tilt attitude (inclination angle and tool face angle).
Real-time calculation is performed using the following mathematical models:
1.Tool Face Angle (TF) and Magnetic Tool Face Angle (MF)
Based on the Gy and Gz components output by the accelerometer or the Hy and Hz components output by the magnetic sensor, the current tool face orientation is calculated through trigonometric function relationships, which is used to judge the rotational attitude of the equipment in the horizontal plane.
2.Inclination Angle (INC)
It reflects the angle between the sensor's axial direction and the vertical direction. Calculated from the three-axis output values of the accelerometer, it is used to determine the tilt degree of the drill pipe or equipment.
3.Azimuth Angle (AZ)
Combined with magnetic field and acceleration data, the sensor's azimuth relative to magnetic north in the horizontal plane is determined through vector operation, which is a key parameter in directional drilling.
The sensor output supports two modes: raw component data and calculated angle data, which users can select as needed. Meanwhile, CRC verification is adopted to ensure the reliability of data transmission.
Technical Characteristics: Miniaturization, High Precision, and Strong Environmental Adaptability
The DS550LT-A exhibits the following outstanding features in mining environments:
- Miniature Structure: Compact in size, easy to integrate into drill pipes, measurement subs, or mobile equipment.
- High-precision Measurement: Inclination angle accuracy of ±0.1°; azimuth angle accuracy of ±2° when the inclination angle is ≥10°, meeting the requirements of high-precision directional measurement.
- Wide Temperature Operation: Supports a temperature range of -40℃ ~ +85℃, adapting to the temperature differences in underground mines.
- Vibration and Shock Resistance: Withstands 2000g shock and 20g vibration, suitable for the high-vibration environment of mining equipment.
- Configurable Communication: Supports UART serial communication with adjustable baud rate and open instruction set, facilitating system integration.
Industry Application Scenarios
1.Directional Drilling and Borehole Trajectory Measurement
In fields such as coalbed methane development and metal ore exploration, the sensor is installed near the drill bit of the drilling tool to monitor the inclination and azimuth angles of the borehole trajectory in real time, realizing "measurement while drilling" and improving drilling precision and efficiency.
2.Underground Equipment Attitude Monitoring
Installed on equipment such as shearers, roadheaders, and hydraulic supports, it feeds back the tilt and rotation status of the equipment in real time, providing data support for automated mining and safe support.
3.Roadway and Tunnel Directional Construction
During roadway excavation, the sensor can be integrated into shield machines or guidance systems to realize real-time monitoring and deviation correction of the propulsion direction, ensuring that the roadway is constructed according to the designed axis.
4.Geological Disaster Monitoring and Slope Stability Assessment
Deployed at key locations such as slopes and goafs, it monitors stratum tilt and azimuth changes for a long time, providing a basis for geological disaster early warning.
5.Intelligent Mine System Integration
As a sensing node in the Mine Internet of Things (IoT), the sensor can link with inspection robots, drones, and remote control systems, promoting the upgrading of mine intelligence and unmanned operation.
Conclusion
Micro mine directional sensors such as the DS550LT-A have become key sensing units in the digital transformation of mines, thanks to their integrated sensing capability, high-precision calculation, and strong environmental adaptability. In the future, with the further integration of 5G communication, edge computing, and artificial intelligence algorithms, this type of sensor will play a greater role in real-time positioning, autonomous navigation, and intelligent decision-making, driving the development of mines towards the direction of "safety, high efficiency, and intelligence".