Broadband NMR Circuit for Wide Frequency Range Analysis
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Solution Overview
Problem
NMR systems are limited by their narrow-band operation, which restricts frequency tuning and accuracy in material property analysis due to electrically tuned circuits and impedance modulation during excitation and response phases, leading to inefficiencies in energy coupling and analysis accuracy.
Innovation Solution
A broadband NMR system is implemented using a broadband transmitter and receiver, where a controller and driver generate stimulus signals across a wide frequency range without requiring resonance with electrical components, and a passive duplexer provides isolation without active devices, allowing for continuous operation across a broad range of frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrically tuned circuits are used to detect the response magnetic field, then the system can operate at a specific resonant frequency, but the operational frequency range is limited to a narrow band
Solution Approach 1:
The patent changes the fundamental operating parameter from resonant frequency tuning to broadband frequency generation. The broadband transmitter generates stimulus signals across a wide frequency range without relying on resonance with electrical components, while the broadband receiver detects responses across the same wide frequency range. This parameter change eliminates the narrow-band limitation while maintaining measurement precision through digital signal processing and Fourier transformation.
2Ease of operation
If active switches are used to couple transmitter or receiver to the coil, then the system can switch between excitation and response modes, but the impedance modulation continues to limit frequency operation
Solution Approach 1:
The patent replaces the mechanical/electrical switching mechanism with a digital control approach. Instead of using active switches that modulate impedance and limit frequency operation, the system uses digital signal processing and Fourier transformation to selectively identify and process signals at different frequencies. This substitution eliminates the fundamental limitation imposed by impedance modulation while maintaining the ability to switch between excitation and response modes.
3Use of energy by moving object
If the system operates at a fixed resonant frequency, then the tuned circuit can efficiently couple energy, but the accuracy of material property analysis is limited by tuning constraints
Solution Approach 1:
The patent creates a universal NMR system that can operate across a wide frequency range rather than being constrained to a single resonant frequency. The broadband transmitter and receiver can detect signals at multiple frequencies simultaneously, allowing the system to adapt to different material properties and resonance frequencies. This multi-functionality enables accurate material property analysis across a broader spectrum while maintaining efficient energy coupling through optimized broadband matching networks.
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 enables more accurate and efficient analysis of material properties by allowing operation across a broad frequency range, reducing the need for complex active device control and minimizing overloading, thus enhancing the accuracy and effectiveness of NMR analyses.
Implementation Method 1
a broadband transmitter and receiver, where a controller and driver generate stimulus signals across a wide frequency range without requiring resonance with electrical components
Implementation Method 2
detecting a resulting magnetic field during a response phase
Data Source
AI summary
A device and system for generating a broadband excitation signal and corresponding excitation field to a substance under test in an NMR system is presented. The excitation signal is generated, according to a broadband transmitter, to a coil in the NMR system. A corresponding broadband receiver is also presented that acquires a response signal resulting from a response field emanating from the substance under test. Neither the transmitter nor the receiver require that the frequency of operation be determined according to a particular configuration of electrical devices to determine a resonance characteristic that tunes to a particular operational frequency. Rather, the operational frequency is determined according to control and driver devices triggered according to command and control signals in the case of the transmitter, and according to reactive elements, that are not configured as a tuned circuit, in the case of the receiver.