Multi-Frequency LC Resonator for Mass Spectrometer RF Drive

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Solution Overview

Problem

Mass spectrometers are limited to operating at a single fixed frequency, requiring manual and costly changes to switch between different frequencies, which hinders simultaneous optimization of sensitivity and resolution.

Innovation Solution

A multi-frequency RF power source system that allows simultaneous or sequential operation at multiple frequencies, using separate frequency sources feeding into a summer and an LC resonator network tuned to resonate at multiple frequencies, eliminating the need for manual assembly changes and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single fixed frequency is used in the LC resonator, then the system is simple and stable, but the ability to switch between different frequencies is poor

Engineering Contradiction:

Improvefrequency switching capabilityVSAvoidsystem complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by making the resonator frequency adjustable rather than fixed. The LC resonator is designed with variable inductance or capacitance elements that allow the resonant frequency to be changed dynamically during operation, enabling the system to adapt to different frequency requirements without requiring multiple fixed-frequency resonators.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements multi-functionality by designing a single LC resonator that can operate at multiple frequencies. This universal resonator structure replaces the need for multiple separate resonators tuned to different frequencies, allowing the system to perform various frequency-dependent functions with one component.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Speed

If manual assembly changes are made to switch frequencies, then multiple frequency operation is possible, but the switching time is long and operation is complex

Engineering Contradiction:

Improvefrequency switching speedVSAvoidoperational complexity

Core Design Contradiction:

SpeedVSEase of operation

Solution Approach 1:

The patent replaces the mechanical assembly-changing process with an electrical control system. Frequency switching is achieved through electronic adjustment of the LC resonator parameters using control circuits and signal processing, eliminating the need for manual mechanical reconfiguration of the resonator assembly.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent implements preliminary action by pre-configuring the LC resonator with adjustable elements that can be quickly reconfigured electronically. The resonator is designed in advance to accommodate a range of frequencies, and switching is achieved by pre-programmed or on-the-fly adjustment of component values rather than physical reassembly.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If multiple quad drivers and resonator assemblies are used to achieve multi-frequency operation, then frequency versatility is improved, but the device complexity and cost increase

Engineering Contradiction:

Improvemulti-frequency operation capabilityVSAvoidnumber of components

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges multiple frequency-specific resonator assemblies into a single multi-frequency LC resonator. By combining the functionality of what would traditionally require separate resonators for different frequencies into one unified structure, the system achieves multi-frequency operation with reduced component count and lower complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies universality by designing one LC resonator that can serve multiple frequency functions simultaneously or sequentially. This single universal resonator replaces the need for multiple specialized resonator assemblies, reducing both the number of components and the overall system complexity while maintaining the ability to operate at various frequencies.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Enables near-instant switching between frequencies, optimizing sensitivity and resolution, reducing the need for multiple quad drivers and resonator assemblies, and allowing the use of less costly conductive metal rods, thereby enhancing operational flexibility and cost-effectiveness.

Implementation Method 1

an LC resonator network tuned to the first and second frequencies

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS11342169B2Multi frequency LC resonator topologies applicable to mass spectrometer radio-frequency drive systems

Publication Date: 2022.05.24 AGILENT TECHNOLOGIES INC

AI summary

In one embodiment, a power source for providing high-voltage radio-frequency (RF) energy to an instrument such as a mass spectrometer includes an RF power amplifier having an output, an oscillating RF signal generator configured to provide first and second RF signals respectively oscillating at first and second frequencies to the RF power amplifier, and a step-up circuit for magnifying the RF power amplifier output. The step-up circuit includes an LC resonator network tuned to the first and second frequencies, and an output for providing the magnified voltage to a rod assembly of the mass spectrometer.