NMR Measurement Apparatus Using Single Mixer for Multi-Frequency Signals
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Solution Overview
Problem
Existing NMR measurement apparatuses face complexity and increased manufacturing costs due to the need for multiple transmission and reception sections with separate frequency converters for generating multiple transmission signals with different frequencies, which complicates the apparatus structure and increases costs.
Innovation Solution
An NMR measurement apparatus that employs a mixer to frequency-convert a transmission signal with a local signal, a power amplifier to amplify the signal, and a demultiplexing circuit with filters to generate multiple transmission signals with different frequencies, using a single local signal and shared components to simplify the structure and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transmission sections with separate frequency converters are provided to generate multiple transmission signals with different frequencies, then the ability to simultaneously irradiate multiple electromagnetic waves is improved, but the apparatus structure becomes complex and manufacturing cost increases
Solution Approach 1:
The patent combines multiple frequency conversion functions into a single mixer that processes multiple transmission signals simultaneously. Instead of providing separate frequency converters for each transmission signal, the invention uses one mixer that handles all frequency conversions, thereby reducing apparatus complexity while maintaining the ability to generate multiple electromagnetic waves with different frequencies.
Solution Approach 2:
The single mixer is designed to perform multiple frequency conversion functions simultaneously for different transmission signals. This universal approach allows the same hardware component to serve multiple purposes, enabling the system to generate multiple electromagnetic waves with different frequencies without requiring dedicated separate frequency conversion circuits for each signal.
2Adaptability or versatility
If multiple reception sections with separate frequency converters are provided to correspond to multiple transmission sections, then the measurement capability is improved, but the apparatus structure becomes more complex and manufacturing cost increases
Solution Approach 1:
The patent applies the same merging principle to the reception section by combining multiple frequency conversion functions into a single frequency converter. This allows the system to process multiple reception signals simultaneously using one shared frequency conversion component, reducing structural complexity while maintaining comprehensive measurement capability.
Solution Approach 2:
The single frequency converter in the reception section is designed to handle multiple reception signals with different frequencies simultaneously. This multi-functional design enables the system to maintain full measurement capability across multiple channels without requiring separate dedicated frequency conversion circuits for each reception signal.
3Device complexity
If a single local signal is used for frequency conversion in the mixer, then the apparatus structure is simplified, but the ability to generate multiple different frequencies is compromised
Solution Approach 1:
The patent employs periodic modulation of the local signal to enable frequency generation. By periodically varying the local signal characteristics, the mixer can generate multiple different output frequencies from a single input local signal, thereby maintaining frequency generation capability while using a simplified single local signal source.
Solution Approach 2:
The invention changes parameters of the local signal dynamically to generate different output frequencies. By adjusting parameters such as frequency, phase, or amplitude modulation of the local signal, the system can produce multiple different frequencies at the mixer output without requiring multiple separate local signal sources, thus simplifying the apparatus structure.
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 configuration allows for the generation of multiple transmission signals with different frequencies using a simple structure, reducing manufacturing costs and maintaining signal purity, while enabling simultaneous or sequential irradiation of electromagnetic waves on a sample.
Implementation Method 1
a mixer that multiplies a transmission signal having a plurality of different frequency components by a local signal, to thereby generate a frequency-converted transmission signal
Implementation Method 2
a power amplifier that amplifies the frequency-converted transmission signal, and outputs an amplified transmission signal
Implementation Method 3
a demultiplexing circuit that has a plurality of filters having a plurality of different frequency characteristics, that allows the amplified transmission signal to pass through the plurality of filters so as to generate, in parallel with each other, a plurality of transmission signals having a plurality of different irradiation frequencies
Data Source
AI summary
In a frequency converter, a transmission signal having a first frequency component and a second frequency component is multiplied by a local signal, to thereby frequency-convert the transmission signal. In a power amplifier, the frequency-converted transmission signal is amplified. A demultiplexing circuit generates a first transmission signal and a second transmission signal from the amplified transmission signal. A controller is configured to set for a transmission section a frequency set suitable for two irradiation frequencies.