Inductive Sensor Excitation Monitoring for Sinusoidal Signal Integrity
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Solution Overview
Problem
Existing inductive sensors do not effectively check whether the excitation signal is sinusoidal, leading to potential electromagnetic compatibility issues and reduced accuracy.
Innovation Solution
Incorporating a filter system to verify the sinusoidal form of the excitation signal, which includes a bandpass filter, rectifier, and comparison unit, or an analog/digital converter, FFT unit, and comparison unit to ensure the signal's sinusoidal nature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter system is added to check the sinusoidal form of the excitation signal, then electromagnetic compatibility and measurement accuracy are improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by checking the sinusoidal form of the excitation signal before it is used for measurement. The filter system (bandpass filter, rectifier, comparison unit) continuously monitors the excitation signal generated by the oscillator, detecting deviations from sinusoidal form before they affect measurement accuracy or electromagnetic compatibility. This preventive approach ensures signal quality without requiring complex real-time correction mechanisms during measurement.
Solution Approach 2:
The patent implements feedback by using the comparison unit to compare the rectified excitation signal with a reference sinusoidal signal. When deviations are detected, the system generates feedback information that can trigger interventions such as adjusting oscillator parameters or alerting the control unit. This closed-loop feedback mechanism maintains signal quality while using relatively simple circuitry, resolving the contradiction between reliability improvement and device complexity.
2Measurement precision
If the excitation signal is made perfectly sinusoidal, then measurement accuracy is improved, but electromagnetic compatibility may deteriorate due to stricter emission requirements
Solution Approach 1:
The patent applies dynamics by making the excitation signal adaptable rather than strictly fixed. The system monitors the sinusoidal form continuously and allows dynamic adjustment of the oscillator parameters or intervention strategies based on detected deviations. This dynamic approach enables the system to maintain measurement accuracy when sinusoidal form is preserved while applying corrections only when necessary, thereby reducing unnecessary electromagnetic emissions associated with overly strict sinusoidal enforcement.
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
Ensures the excitation signal remains sinusoidal, enhancing electromagnetic compatibility and accuracy by detecting and correcting deviations.
Implementation Method 1
an oscillator for generating a sinusoidal excitation signal having a first excitation frequency
Implementation Method 2
a resonant circuit, which is connected to the oscillator and may be excited by the excitation signal to generate an electromagnetic field
Implementation Method 3
The bandpass filter may have an input which is connected to the output of the oscillator
Implementation Method 4
The checking filter may include an analog/digital converter for digitizing an analog signal
Implementation Method 5
The filter for checking the sinusoidal form may include a rectifier, which has an input
Implementation Method 6
The filter for checking the sinusoidal form may include an FFT unit, which has an input
Data Source
AI summary
An inductive sensor, in particular a length sensor or an angle sensor, including an oscillator for generating a sinusoidal excitation signal having a first excitation frequency. A resonant circuit is connected to the oscillator and may be excited by the excitation signal to generate an electromagnetic field. A coupling element is movable relative to the resonant circuit, for changing the field as a function of a length or a rotation angle. A sensor generates an electrical sensor signal as a function of the field, A measuring transducer generates a measuring transducer output signal as a function of the electrical sensor signal, which represents the length or the rotation angle, and a checking filter checks the sinusoidal form of the excitation signal.