Magnetic Resonance Apparatus Diode Parallel Assembly Ringing Suppression
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Solution Overview
Problem
In magnetic resonance measurement apparatuses, the 'ringing' phenomenon, where transmission energy decays slowly, interferes with the measurement of weak response signals in solid-state NMR, leading to extended 'dead time' and reduced precision, especially in solid-state NMR where response signals are brief.
Innovation Solution
A magnetic resonance measurement apparatus employing a parallel connection assembly with a diode that functions as a short-circuit during transmission and capacitance during reception, allowing the resonance frequency to shift and suppress ringing effects, enabling high-precision measurement of response signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LC circuits are used to accumulate signal energy for efficient excitation and reception, then transmission/reception efficiency is improved, but the accumulated energy decays slowly causing extended dead time
Solution Approach 1:
The patent extracts the harmful ringing energy from the LC circuit by introducing a parallel connection assembly with diodes that selectively divert the decaying transmission energy away from the measurement path, allowing the useful NMR signals to be measured without interference
Solution Approach 2:
The parallel connection assembly with diodes acts as an intermediary element that mediates between the LC circuit's accumulated energy and the measurement system, directing transmission energy through the diodes while allowing reception of NMR signals through the capacitor
2Power
If transmission energy is accumulated in LC circuits, then excitation efficiency is improved, but the decaying transmission energy interferes with measurement of weak response signals
Solution Approach 1:
The patent converts the harmful interference of decaying transmission energy into a beneficial effect by using the parallel connection assembly to direct this energy through diodes in a controlled manner, transforming the interference into a manageable component that does not affect measurement precision
3Ease of operation
If the operation mode is switched from transmission to reception, then response signal reception is enabled, but the switching must be performed quickly for solid-state NMR
Solution Approach 1:
The parallel connection assembly is pre-configured with diodes and capacitors that automatically begin directing transmission energy away from the measurement path immediately when transmission stops, eliminating the need for active switching and reducing dead time
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 precise measurement of response signals by transitioning the ringing component to a different resonance frequency, reducing the 'dead time' and enhancing measurement accuracy without requiring complex circuits or significant cost increases.
Implementation Method 1
In a first state in which oscillating voltage for forming the oscillating magnetic field is applied to the first LC circuit, the diode of the parallel connection assembly functions as a short-circuit such that the resonance frequency of the first LC circuit becomes a first resonance frequency
Implementation Method 2
In a second state in which the oscillating voltage is not applied to the first LC circuit, the diode of the parallel connection assembly functions as capacitance such that the resonance frequency of the first LC circuit becomes a second resonance frequency that is different from the first resonance frequency
Implementation Method 3
a first LC circuit that forms an oscillating magnetic field that causes an object to exhibit magnetic resonance
Implementation Method 4
receive response signals emitted from nuclear spin excited by the excitation signals (oscillating magnetic field (high-frequency magnetic field) or electromagnetic waves generated by an oscillating magnetic field)
Data Source
AI summary
A magnetic resonance measurement apparatus according to the present invention includes a first LC circuit that forms an oscillating magnetic field that causes an object to exhibit magnetic resonance. The first LC circuit includes a parallel connection assembly including a diode. The parallel connection assembly further includes a diode connected, in parallel and in reverse direction, to the diode, or an inductor connected in parallel to the diode. In a first state in which oscillating voltage for forming the oscillating magnetic field is applied to the first LC circuit, the diode of the parallel connection assembly functions as a short-circuit such that the resonance frequency of the first LC circuit becomes a first resonance frequency. In a second state in which oscillating voltage is not applied to the first LC circuit, the diode of the parallel connection assembly functions as capacitance such that the resonance frequency of the first LC circuit becomes a second resonance frequency that is different from the first resonance frequency.