Pulse Measurement Device Using Interdigital Microwave Resonators
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Solution Overview
Problem
Existing pulse measurement technologies, such as those using microwave frequency offset methods, require complex detection devices and are limited by low sensitivity and slow sampling rates, making them inefficient and susceptible to external environments.
Innovation Solution
A pulse measurement device comprising two microwave resonators, mixers, and a signal processing unit that uses intermodulation to amplify signals and improve detection sensitivity, with the resonators being designed as interdigital capacitor shape resonators to enhance the induced electric field and facilitate user placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microwave frequency offset method is used for pulse measurement, then measurement can be performed, but detection sensitivity is low and sampling rate is slow
Solution Approach 1:
The patent uses microwave resonators to generate high-frequency oscillating electric fields that interact with the pulse signal. By utilizing resonance phenomena at specific frequencies, the system amplifies the pulse-induced signal variations, thereby improving detection sensitivity while maintaining adequate sampling rates through the resonant oscillation cycles.
Solution Approach 2:
The patent transforms the measurement approach by changing from direct frequency offset detection to amplitude demodulation of down-converted signals. This parameter transformation allows the system to extract pulse information through amplitude variations after mixing, improving both sensitivity and enabling faster sampling through efficient signal processing.
2Measurement precision
If microwave frequency offset method is used for pulse measurement, then measurement can be performed, but detection devices are complex
Solution Approach 1:
The patent combines multiple functions into integrated components: the resonators serve both as signal generators and sensors, the mixers perform frequency conversion while the signal processing unit handles both demodulation and analysis. This functional integration reduces the number of separate components and simplifies the overall detection device structure while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces complex frequency sweep mechanisms and direct frequency offset detection systems with a simpler amplitude demodulation approach. By using mixers to down-convert signals and then detecting amplitude variations, the system achieves accurate pulse measurement without requiring complex frequency scanning hardware or sophisticated frequency analysis equipment.
3Ease of operation
If the resonators are disposed at a local position, then user placement is convenient, but signal strength may be reduced
Solution Approach 1:
The patent employs resonators operating at their resonant frequencies to generate strong localized electric fields. This resonance amplification compensates for the reduced signal strength that would result from compact local placement, allowing the resonators to be disposed close together or in space-constrained locations while maintaining adequate signal intensity for accurate pulse detection.
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 solution enhances measurement accuracy, reduces errors, and improves detection sensitivity by amplifying signals through intermodulation and amplitude demodulation, allowing for more precise and convenient pulse measurement.
Implementation Method 1
Each of the microwave resonators is coupled to the first signal source, to form an electric field according to the first high-frequency signal, and senses a variation in the electric field which is interfered by a pulse
Implementation Method 2
two microwave resonators, two mixers, and a signal processing unit. The first signal source and the second signal source respectively output a first high-frequency signal and a second high-frequency signal. Each of the microwave resonators is coupled to the first signal source, to form an electric field according to the first high-frequency signal
Implementation Method 3
The two mixers are coupled to the second signal source, and each of the mixers is coupled to one of the two microwave resonators, to mix the sensing signal and the second high-frequency signal to output a down-converted signal
Implementation Method 4
The signal processing unit is coupled to the two mixers, to respectively demodulate amplitudes of the down-converted signals of the two mixers to obtain amplitude signals
Data Source
AI summary
A pulse measurement device is provided, including a first signal source, a second signal source, two microwave resonators, two mixers, and a signal processing unit. The first signal source and the second signal source output a first high-frequency signal and a second high-frequency signal, respectively. Each of the microwave resonators generates an electric field according to the first high-frequency signal, and senses a variation in the electric field which is interfered by a pulse to obtain a sensing signal. Each of the mixers is coupled to one of the microwave resonators, to mix the sensing signal and the second high-frequency signal to output a down-converted signal. The signal processing unit respectively demodulates amplitudes of the down-converted signals of the two mixers to obtain amplitude signals.