Lock-In Amplifier Integration for Phase-Synchronous Signal Analysis
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Solution Overview
Problem
Lock-in amplifiers and phase-synchronous processing (PSP) units are used separately, lacking a combined solution that leverages their capabilities for enhanced signal analysis, particularly in providing frequency-domain and time-domain information, and efficient multi-frequency analysis.
Innovation Solution
Integration of a PSP unit into a lock-in amplifier, allowing for phase-associated signal processing and shared analog-digital conversion, enabling real-time feedback, harmonic distortion analysis, and statistical time-domain analysis beyond traditional lock-in amplifier capabilities, with the PSP output providing additional insights like frequency-domain information and faster transient analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lock-in amplifier and PSP unit are used separately, then each device can perform its dedicated function, but the system lacks versatility and cannot provide both frequency-domain and time-domain information simultaneously
Solution Approach 1:
The patent combines the lock-in amplifier and PSP unit into a single integrated device, merging their respective signal processing functions. The lock-in amplifier provides frequency-domain analysis while the PSP unit provides time-domain analysis, allowing both types of information to be obtained from the same input signal without requiring separate instruments.
Solution Approach 2:
The integrated device performs multiple functions by incorporating both lock-in amplification and phase-synchronous processing capabilities. It can simultaneously provide frequency-domain information through the LIA unit and time-domain information through the PSP unit, making it a universal instrument for various signal analysis applications.
2Measurement precision
If multiple harmonics are measured using traditional multi-demodulator implementations, then frequency analysis is possible, but resolution and memory usage are inefficient
Solution Approach 1:
The PSP unit introduces a phase dimension for organizing signal data, dividing the signal into multiple phase intervals. This phase-domain organization allows efficient storage and processing of harmonic information, achieving high measurement precision for multiple harmonics while using memory more efficiently than traditional time-domain multi-demodulator approaches.
3Speed
If real-time transient analysis is performed, then fast signal changes can be detected, but traditional lock-in amplifiers lack the capability for statistical time-domain analysis
Solution Approach 1:
The integration merges the fast frequency-domain response of the lock-in amplifier with the time-domain analysis capabilities of the PSP unit. This combination enables real-time transient analysis while also providing statistical time-domain analysis functions that were previously unavailable in traditional lock-in amplifiers.
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
The integration enhances the versatility of lock-in amplifiers by offering real-time displays of transients, immediate harmonic distortion feedback, and statistical analysis, enabling concurrent measurement of multiple harmonics with efficient resource use, surpassing multi-demodulator implementations in resolution and memory usage.
Implementation Method 1
a demodulator generating an unfiltered LIA-signal by multiplying said input signal and said reference signal
Implementation Method 2
a low-pass filter connected to said demodulator and filtering said unfiltered LIA-signal for generating a filtered LIA output signal
Implementation Method 3
a value-phase association unit adapted to associate values of said input signal to a phase of said reference signal and to thereby generate phase-associated signal values
Data Source
AI summary
The presented device is the combination of a lock-in amplifier unit (1) and a phase-synchronous processing unit (2). This combination leads to a multitude of valuable signal analysis and conditioning possibilities. Amongst others, these possibilities include (i) extraction of time-domain properties of the input signal, (ii) extraction of statistical properties of the input signal, (iii) extraction of frequency-domain properties of the input signal, and (iv) preconditioning of the lock-in input signal.