Pulsed Discharge Helium Ionization Detector Multi-Electrode Design

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Solution Overview

Problem

Conventional pulsed discharge helium ionization detectors for gas chromatography with a single bias/collecting electrode limit the information obtainable, resulting in lower sensitivity, smaller linear range, slower response, higher gas consumption, and limited qualification capability.

Innovation Solution

A pulsed discharge helium ionization detector with multiple combined bias/collecting electrodes, incorporating a detector body with internal ionization sources, voltage-biased electrodes, current-to-voltage converters, voltage polarity inverters, gain adjusters, and time-dependent voltage aggregators to enhance detection sensitivity and accuracy by correcting peak distortions and adjusting for intensity and time delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a single bias/collecting electrode is used in the detector, then the device complexity is reduced, but the sensitivity and information obtainable from the detector are limited

Engineering Contradiction:

Improvedetection sensitivityVSAvoidelectrode configuration

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The single collecting electrode is segmented into multiple collecting electrodes arranged in series within the detector cell. Each electrode collects ions at different positions along the gas flow path, providing multiple detection points that increase overall sensitivity and information obtainable from the detector while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #1Segmentation

2Productivity

If a single bias/collecting electrode is used, then the device structure is simplified, but the linear range and response speed are reduced

Engineering Contradiction:

Improveresponse speedVSAvoidelectrode configuration

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Multiple collecting electrodes are positioned at different locations within the detector cell along the gas flow path. This segmentation allows parallel ion collection at multiple positions, increasing the effective detection area and improving response speed without requiring a completely redesigned complex structure.

Inventive Principle:

Principle #1Segmentation

3Measurement precision

If multiple combined bias/collecting electrodes are implemented, then sensitivity and linear range are improved, but the device complexity increases

Engineering Contradiction:

Improvedetection sensitivityVSAvoidelectrode configuration

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Each collecting electrode is combined with a bias electrode to form a combined bias/collecting electrode structure. This merging allows the same electrode to perform dual functions: establishing the electric field through bias voltage and collecting ions simultaneously, thereby reducing the total number of separate electrodes needed while maintaining high sensitivity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The combined electrodes serve multiple functions: they provide bias voltage to create electric fields for ion drift, collect ions generated in the detector cell, and can be individually controlled to optimize detection parameters. This multi-functionality reduces overall device complexity while achieving improved performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Quantity of substance

If multiple collecting electrodes are used to increase sensitivity, then gas consumption increases, but the linear range improves

Engineering Contradiction:

Improvegas consumptionVSAvoidlinear range

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The detector cell is divided into multiple detection zones with individual collecting electrodes positioned at different locations. This segmentation allows the detector to effectively monitor a larger volume of gas flow with multiple electrodes working in parallel, expanding the linear dynamic range while maintaining efficient gas utilization through optimized electrode spacing and geometry.

Inventive Principle:

Principle #1Segmentation

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

The multi-electrode configuration improves sensitivity, linear range, and response speed, correcting peak distortions and reducing gas consumption, while providing a more accurate determination of sample constituents through enhanced chromatogram analysis.

Implementation Method 1

pulsed discharge helium ionization detector

Methodology Applied

Scientific EffectPulsed discharge: Electric Spark

Implementation Method 2

ionization process

Methodology Applied

Scientific EffectIonization: Ionisation

Implementation Method 3

voltage-biased bias/collecting electrodes

Methodology Applied

Scientific EffectElectric field: Electric Field

Data Source

PatentUS8963554B2Pulsed discharge helium ionization detector with multiple combined bias/collecting electrodes for gas chromatography and method of use

Publication Date: 2015.02.24 VALCO INSTRUMENT COMPANY INC

AI summary

A pulsed discharge helium ionization detector for gas chromatography with multiple combined bias/collecting electrodes.