Mixed Polarization Antenna Telemetry for Rotating Tools
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Solution Overview
Problem
Existing systems face difficulties in transmitting measurement data from moving systems to stationary base stations without requiring a stator in close proximity, particularly in applications like rotating tools and robots, due to the limitations of near-field telemetry and interference issues in far-field telemetry.
Innovation Solution
The use of a device with a linearly polarized antenna for sending measurement data and a circularly polarized antenna for receiving configuration and control data, or vice versa, to ensure stable and interference-free data transmission, even when the antennas are not aligned optimally, by minimizing signal loss and compensating with increased power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If near-field telemetry is used for contactless data transmission, then data can be transmitted without cables, but a stator must be arranged in close proximity (a few millimeters) to the measurement unit, which is disadvantageous for rotating tools and robots
Solution Approach 1:
The patent introduces a stator as an intermediary component that remains stationary while the rotor (measurement unit) moves. The stator contains the reference antenna and serves as a fixed reference point for telemetry, allowing the moving rotor to transmit data without requiring a stator in immediate proximity. This mediator approach enables contactless transmission while maintaining installation flexibility for rotating tools and robots.
2Ease of operation
If far-field telemetry is used for data transmission, then installation flexibility is improved, but signal strength decreases and interference issues increase due to fading, shadowing, multipath propagation, and Doppler effect
Solution Approach 1:
The patent changes the operational parameters of the telemetry system by using a mixed polarization configuration (linear polarization for one antenna, circular polarization for the other) and operating in the far-field region. This parameter change allows the system to achieve both installation flexibility and acceptable signal stability by compensating for far-field effects through proper antenna polarization matching and power adjustment.
3Power
If conventional antennas with the same polarization are used for transmission, then signal strength is maximized when antennas are aligned, but signal loss occurs when antennas are not aligned optimally due to movement
Solution Approach 1:
The patent applies asymmetry by using different polarization types for the two antennas in the telemetry system. Instead of using identical polarization (both linear or both circular), the system uses one linearly polarized antenna and one circularly polarized antenna. This asymmetric configuration provides complementary advantages: linear polarization offers strong signal when aligned, while circular polarization maintains signal strength during rotation and misalignment, creating a balanced system with high alignment tolerance.
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 provides stable and interference-free data transmission with reduced signal loss, maintaining signal strength even when the antennas are not aligned optimally, and is resilient to reflections and other disruptive factors, ensuring reliable data transfer in industrial environments.
Implementation Method 1
the first antenna is a linearly polarized antenna and the second antenna is a circularly polarized antenna or vice versa. Correspondingly, in the method according to the invention, during telemetric transmission, the first antenna polarizes the measurement data linearly and the second antenna polarizes the configuration and control data circularly or vice versa.
Data Source
Figure 1~3
AI summary
The invention relates to a device (1), comprising a measurement unit (3) and a base station (21), and to a method for receiving measurement signals by means of the measurement unit (3) and for telemetric transmission of measurement data to the base station (21), wherein for a measurement the base station (21) is arranged in a stationary manner in a work space (20) and the measurement unit (3) is attached fixedly to a system (2) that moves within said work space (20). A sensor (4, 5) for receiving measurement signals can be attached to or integrated in the measurement unit (3). The measurement unit (3) also comprises an electronic unit (7) having a first processor (8), a first telemetric unit (14), and a first antenna (15) for sending measurement data and for receiving configuration and control data. The base station (21) comprises a second antenna (22) and a second telemetric unit (24) for receiving the measurement data and for sending the configuration and control data, and a data processing unit (25). According to the invention, the first antenna (15) is a linearly polarised antenna and the second antenna (22) is a circularly polarised antenna, or vice versa.