Oscillatable Unit Frequency Sweep Phase Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing frequency search sweep methods for vibronic measuring devices are either complex and inaccurate in analog implementations or highly calculation-intensive in digital forms, making them inefficient for determining the oscillation frequency with a predetermined phase shift.
Innovation Solution
The method involves sampling the received signal discretely at selected points in time based on the predetermined phase shift and evaluating the voltage values to reduce computing power and circuit complexity, allowing for efficient digital evaluation and accurate determination of the oscillation frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If analog evaluation methods with phase selective rectification and low-pass filtering are used, then the circuit implementation is straightforward, but the circuit complexity is high and the determination accuracy is relatively low
Solution Approach 1:
The patent replaces the analog evaluation method (mechanical/electrical circuit system) with a digital evaluation method. Instead of using phase selective rectification and low-pass filtering circuits, the invention uses a microcontroller to digitally process the received signal. The microcontroller samples the signal at specific points, calculates the phase difference between transmitted and received signals, and determines the oscillation frequency through digital computation, thereby eliminating complex analog circuits while improving accuracy.
2Device complexity
If digital evaluation methods are used, then the circuit complexity is reduced and determination accuracy is improved, but the computing power requirement is very high
Solution Approach 1:
The patent extracts and processes only the essential features of the signal rather than performing full-spectrum analysis. The microcontroller samples the received signal at specific time points corresponding to the expected phase shift, calculates only the necessary phase difference, and identifies the frequency where the phase shift matches the predetermined value. This selective processing approach reduces computational requirements while maintaining accuracy.
Solution Approach 2:
The invention performs partial processing of the signal by sampling at selected points rather than continuously processing the entire signal spectrum. The microcontroller evaluates the phase difference at discrete frequency points during a frequency search sweep, stopping once the predetermined phase shift is found, rather than analyzing all possible frequencies in detail.
3Reliability
If the entire received signal is further processed, then comprehensive analysis is achieved, but the number of measurement points is large and processing time increases
Solution Approach 1:
The patent segments the signal processing task into discrete sampling points rather than continuous processing. The microcontroller divides the frequency range into discrete steps and samples the signal at specific time points corresponding to each frequency step. This segmentation allows the system to process only relevant portions of the signal, reducing the total number of measurement points while maintaining evaluation reliability.
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 reduces the number of measurement points, decreases computing power requirements, and achieves accurate results with filtered noise, saving time and manufacturing costs while maintaining precise evaluations.
Implementation Method 1
the oscillatable unit is excited by means of a frequency search sweep within a predetermined frequency band in the working range of the oscillatable unit in the form of transmitted signals successively to oscillate with discrete exciter frequencies
Implementation Method 2
The exciting of the oscillatable unit to oscillate with the resonance frequency occurs usually via a piezoelectric stack- or bimorph drive
Data Source
AI summary
A method for determining and/or monitoring at least one physical, process variable of a medium with an oscillatable unit, wherein the oscillatable unit is excited by means of a frequency search sweep within a predetermined frequency band in the working range of the oscillatable unit in the form of transmitted signals successively to oscillate with discrete exciter frequencies wherein the corresponding oscillations of the oscillatable unit are received in the form of received signals, wherein, via the frequency search sweep, the exciter frequency is ascertained, in the case of which the oscillatable unit oscillates with an oscillation frequency, which has a predetermined phase shift between the transmitted signal and the received signal. The transmitting/receiving unit excites the oscillatable unit to oscillate with the ascertained oscillation frequency. The selected points in time depend on the predetermined phase shift between transmitted signal and received signal and that the voltage values sampled at the discrete exciter frequencies of the received signal are evaluated with reference to their amplitude.