Closed-Loop Sensor Signal Analysis for Target Position Detection
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Solution Overview
Problem
Existing sensor systems face challenges in unambiguously detecting movements and positions of targets due to interference from distance information, especially in inductive and capacitive measurement methods, where small signal changes are difficult to detect and amplify effectively.
Innovation Solution
A sensor arrangement and method that uses a closed-loop control system to maintain a 'zero signal' condition, allowing for the separation of distance and movement information by processing control signal deviations in a four-quadrant presentation, enabling precise detection of target position and shape without external influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inductive or capacitive measurement methods are used to detect target position, then detection capability is provided, but distance information interferes with unambiguous detection of movement
Solution Approach 1:
The patent segments the measurement information by using multiple coil systems (at least two transmitting coils and one receiving coil) to separate distance information from movement information. Each coil system provides independent measurement data that, when combined, allows differentiation between target distance and target movement, resolving the interference problem.
Solution Approach 2:
The patent introduces additional measurement dimensions by employing multiple coil arrangements with different orientations and positions. This multi-dimensional approach enables the system to distinguish between radial distance changes and tangential movement components that were previously conflated in single-coil systems.
2Measurement precision
If signal amplification is performed to detect small signal changes, then detection sensitivity is improved, but external influences and amplification changes affect measurement accuracy
Solution Approach 1:
The patent implements feedback mechanisms where the sensor system continuously monitors its own output signals and uses this information to compensate for amplification variations and external influences. The control system adjusts measurement parameters based on detected signal characteristics, maintaining measurement reliability despite signal amplification requirements.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting measurement frequency, coil current amplitude, and evaluation thresholds based on detected target distance and signal strength. This adaptive parameter modification allows the system to maintain optimal sensitivity while compensating for external influences across varying operating conditions.
3Device complexity
If conventional coil arrangements are used, then simple structure is maintained, but unambiguous detection of target movement in all directions is not achieved
Solution Approach 1:
The patent merges multiple coil systems into a unified sensor arrangement where transmitting coils and receiving coils work together in coordinated pairs. This combination of multiple simple coil structures creates a sophisticated measurement system capable of three-dimensional movement detection without requiring overly complex individual coil designs.
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 allows for unambiguous detection of target movement and position, even in rotational bodies, with enhanced sensitivity up to a factor of 20, independent of distance and rotational deviations, effectively filtering out tolerances and improving measurement accuracy.
Implementation Method 1
The invention relates to a sensor arrangement and a method for inductive or capacitive detection of at least one target by determining at least one physical parameter
Implementation Method 2
The invention relates to a sensor arrangement and a method for inductive or capacitive detection of at least one target by determining at least one physical parameter
Data Source
AI summary
A sensor arrangement for determining at least one physical parameter of a sensor unit which is activated by at least one periodic excitation, comprising a detection region in which changes of the parameter in the surroundings of the sensor unit lead to an output signal from the sensor unit. The sensor unit is wired such that if there is no change of the parameter in the detection region the output signal is a zero signal at the output of the sensor unit, whereas if there are changes of the parameter in the detection region the output signal is a signal that is not zero and which has a specific amplitude and phase. By means of a closed-loop control, the non-zero signal in the receive path is adjusted to achieve an adjusted state at zero even in the presence of changes of the parameter in the detection region. Inherent in the control signal used for this adjustment is a deviation (Δx, Δy) of the control signal from the adjusted state, which deviation represents information about the parameter. To create a sensor arrangement and a method in which values of a physical parameter in a detection region can be clearly determined, in a four-quadrant representation of the deviation (Δx, Δy) in the form of a vector analysis in a phase space of the control signal, the angle of an imaginary vector (2.6) relative to the x axis of an x, y coordinate system, said vector leading from the origin (2.7) of the x, y coordinate system to a measuring point (2.5) and said origin corresponding to the adjusted state, represents a measurement for the change of the parameter along a direction, and/or the magnitude of the imaginary vector (2.6) represents a measurement for the change of the parameter along a further direction.