NMR Lock Sequencer Modulation for Signal Noise Reduction
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Solution Overview
Problem
Conventional nuclear magnetic resonance (NMR) measurement apparatuses face challenges in maintaining a uniform static magnetic field, leading to noise interference and reduced signal quality due to fixed lock transmission and reception operations, which limit the resolution and sensitivity of NMR signals.
Innovation Solution
The implementation of a lock transmission and reception circuit with a sequencer that controls lock transmission signals using amplitude, frequency, or phase modulation, allowing for variable timing and modulation techniques to reduce noise and improve signal quality by distributing frequency components and narrowing the spectrum band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed lock transmission and reception operations are used, then the device structure is simple, but noise interference increases and signal quality decreases
Solution Approach 1:
The patent applies dynamics by making the lock transmission signal variable through amplitude modulation, frequency modulation, or phase modulation controlled by a sequencer. Instead of using a fixed continuous wave signal, the system dynamically varies the signal parameters according to predetermined patterns, which distributes the signal energy across different frequencies and reduces noise interference while maintaining device structural simplicity.
Solution Approach 2:
The patent implements periodic action through the sequencer that generates modulation patterns at specific time intervals. The lock transmission signal is modulated periodically with different amplitude, frequency, or phase patterns, and the reception operations are synchronized with these periodic modulations. This periodic variation helps distinguish the NMR signal from random noise and improves signal quality without complicating the device structure.
2Ease of operation
If fixed lock transmission and reception operations are used, then the circuit operation is simple, but signal-to-noise ratio decreases
Solution Approach 1:
The system maintains ease of operation by using a sequencer that automatically generates modulation patterns without requiring manual intervention. The dynamic modulation of amplitude, frequency, or phase is controlled programmatically, keeping the operation simple while significantly improving the signal-to-noise ratio through distributed frequency components that reduce noise interference.
Solution Approach 2:
The patent implements feedback mechanisms where the sequencer monitors the lock reception signal quality and adjusts the modulation parameters accordingly. This feedback loop allows the system to automatically optimize the signal-to-noise ratio by adapting the modulation depth and frequency variations based on the detected signal conditions, maintaining ease of operation while improving measurement precision.
3Measurement precision
If modulation techniques are applied to lock transmission signals, then signal quality improves, but device complexity increases
Solution Approach 1:
The patent achieves signal quality improvement without excessive device complexity by designing a multi-functional sequencer that can generate multiple types of modulation (amplitude, frequency, and phase modulation) using a single circuit unit. This universal approach allows the system to switch between different modulation techniques as needed, improving signal quality while avoiding the need for separate dedicated circuits for each modulation type.
Solution Approach 2:
The sequencer acts as an intermediary component that simplifies the overall device architecture by centralizing the modulation control function. Rather than distributing complex modulation circuits throughout the system, the sequencer mediates between the signal source and the modulation stages, generating control signals that coordinate amplitude, frequency, and phase variations in a unified manner, thus improving signal quality while keeping device complexity manageable.
4Object-generated harmful factors
If modulation techniques are applied to lock transmission signals, then unnecessary signals are reduced, but control complexity increases
Solution Approach 1:
The patent reduces unnecessary signals by implementing periodic modulation patterns through the sequencer. By varying the amplitude, frequency, or phase of the lock transmission signal in regular periodic cycles, the system creates a distinctive signal signature that filters out random noise and unnecessary signals. The periodic nature of the modulation allows synchronous detection techniques to easily distinguish the desired NMR signal from interference, reducing harmful signals while keeping control complexity manageable through programmed sequences.
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 enhances the degree of freedom in NMR measurements, reduces unnecessary signals, and improves the signal-to-noise ratio by dynamically controlling lock operations, enabling more precise observation of static magnetic field changes and increased resolution.
Implementation Method 1
transmits to an NMR probe a lock transmission signal that excites a lock nucleus used for observing a change in a static magnetic field
Data Source
AI summary
A transmission signal generator generates a lock transmission signal that excites a lock nucleus (deuteron) used for observing a change of a static magnetic field. A LOCK transmission circuit transmits the lock transmission signal to an NMR probe. A LOCK reception circuit receives an NMR signal of the lock nucleus. A LOCK transmission sequencer, based on a pulse sequence generated according to at least one of amplitude modulation, frequency modulation, or phase modulation, controls generation of the lock transmission signal performed by the transmission signal generator.