Three-Tone Phase Measurement Using Beat Power Extraction
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Solution Overview
Problem
Existing phase characteristic measurement devices for high-frequency signals require expensive components for high-speed trigger operations and often result in large and costly devices.
Innovation Solution
A phase characteristic measurement device that uses a first detector to receive three-tone signals, a bandpass filter to extract specific frequency components, a second detector to measure the power of these components, a voltmeter to quantify the signal voltage, and a phase calculator to compute the phase relationship without requiring high-speed trigger operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-speed trigger operation is used to obtain initial phase of beat signal, then measurement accuracy is improved, but device cost increases due to expensive components
Solution Approach 1:
The invention extracts only the necessary information (beat signal power) from the detected signal, eliminating the need for expensive high-speed trigger operations. By measuring the power of the beat signal component at frequency difference Δf between three tone signals, the initial phase information is obtained without requiring high-speed triggering, thus reducing device cost while maintaining measurement accuracy
Solution Approach 2:
The invention replaces expensive high-speed trigger components with simpler, cheaper detection components. The beat signal power measurement method uses ordinary detection equipment instead of costly high-speed triggering systems, achieving the same measurement goal with significantly reduced component cost
2Measurement precision
If electro-optical sampling method is used to measure phase characteristic, then measurement accuracy is improved, but device size increases due to optical system requirements
Solution Approach 1:
The invention replaces the electro-optical sampling method (which requires complex optical systems including femtosecond lasers) with an electrical detection method. By detecting the power of beat signals generated from three tone signals passing through a non-linear element, the phase characteristic can be measured using electrical components only, eliminating the need for bulky optical systems while maintaining measurement accuracy
Solution Approach 2:
The invention creates an electrical copy of the phase characteristic information through beat signal power measurement. Instead of directly measuring phase using optical methods, the phase information is copied into the power variations of beat signals, which can then be measured with simple electrical detectors, significantly reducing device size
3Measurement precision
If down-conversion method is used to measure phase characteristic, then measurement capability is improved, but device size increases due to high-frequency local signal requirements
Solution Approach 1:
The invention extracts phase characteristic information directly from the power variations of beat signals generated by three tone signals. By measuring the power at the frequency difference component after passing through a non-linear element, the method eliminates the need for down-conversion stages and high-frequency local oscillators, thereby reducing device size while maintaining measurement capability
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
Enables phase measurement at a relatively low cost without increasing the device's scale, using a voltmeter and detector that do not require high-speed trigger operations, thus improving the cost-effectiveness and compactness of phase characteristic measurement devices.
Implementation Method 1
a bandpass filter (12) that from the signal output from the first detector, passes a frequency component of the angular frequency difference Δω and blocks a frequency component twice the angular frequency difference Δω and a direct current component
Implementation Method 2
a first detector (11) that receives and detects a first three-tone signal obtained by combining three waves e1, e2, e3
Implementation Method 3
a second detector (13) that detects the signal that has passed through the bandpass filter, a voltmeter (14) that measures a voltage of the signal output from the second detector
Data Source
AI summary
A phase characteristic measurement device includes a first detector 11 that receives and detects two patterns of three-tone signals of a first three-tone signal obtained by combining the three waves of angular frequencies ω1, ω2, ω3 (wherein ω2−ω1=ω3−ω2=Δω) and a second three-tone signal obtained by changing a phase of one tone out of the first three-tone signal, a BPF 12 that allows only a beat component of an angular frequency difference Δω of adjacent waves of the three-tone signal from the signal output from the first detector to pass therethrough, a second detector 13 that detects power of the beat component that has passed through the BPF 12, a voltmeter 14 that measures the voltage of the signal output from the second detector, and a phase calculator 15 that calculates the phase based on the measured voltage value.