Airborne Particle Detection Using Electrical Field Substitution

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Solution Overview

Problem

Current air-borne particle detectors, particularly those used in portable devices, face challenges such as sensitivity to ambient conditions, bulkiness, and slow response times due to their reliance on optical sensing and joule-heated resistors, leading to inaccurate and delayed measurements.

Innovation Solution

An apparatus with a body having apertures and electrodes that apply a potential difference, allowing for the detection of air-borne particles based on changes in electrical properties like current, resistance, or capacitance, which is more accurate, compact, and responsive, without the need for optics or thermal convection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If optical sensing is used for particle detection, then measurement capability is provided, but device bulkiness and slow response time occur

Engineering Contradiction:

Improveparticle detection accuracyVSAvoiddevice size

Core Design Contradiction:

Measurement precisionVSVolume of moving object

Solution Approach 1:

The patent replaces optical sensing mechanisms with an electrical field-based detection system. Electrodes generate an electrical field that interacts directly with particles, eliminating the need for optical components such as light sources, lenses, and photodetectors. This substitution dramatically reduces device volume while maintaining measurement capability through electrical property changes when particles contact the electrodes.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If optical sensing is used for particle detection, then measurement capability is provided, but response time becomes slow

Engineering Contradiction:

Improveparticle detection accuracyVSAvoidresponse time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The electrical field-based detection system responds instantaneously to particle contact, eliminating the temporal delays inherent in optical systems. When a particle bridges the electrodes, it immediately alters the electrical field properties (conductivity, capacitance, or impedance), providing real-time detection without the response lag associated with optical sensing mechanisms.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If joule-heated resistors are used for particle detection, then measurement capability is provided, but sensitivity to ambient conditions and inaccuracy occur

Engineering Contradiction:

Improveparticle detection accuracyVSAvoidambient condition sensitivity

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent replaces joule-heated resistor-based detection with direct electrical field interaction. This eliminates the thermal convection mechanisms that make resistor-based systems sensitive to ambient temperature and airflow conditions. The electrical field detection method is inherently more stable as it does not rely on thermal effects that are easily influenced by environmental factors.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention measures changes in electrical parameters (conductivity, capacitance, or impedance) rather than thermal parameters. This fundamental parameter change from thermal to electrical measurement makes the system immune to ambient temperature fluctuations and reduces sensitivity to environmental conditions that affect thermal-based detection methods.

Inventive Principle:

Principle #35Parameter changes

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 solution enables precise detection and measurement of air-borne particles, providing faster response times and more accurate sizing without the limitations of optical sensors, making it suitable for use in environments like hospitals and portable devices.

Implementation Method 1

first and second electrodes positioned within the aperture between which a potential difference can be applied, and a measurement circuit configured to measure an electrical property between the first and second electrodes

Methodology Applied

Scientific EffectElectrical Conductivity: Conduction (electrical)

Implementation Method 2

The electrical property may comprise one or more of current, resistance, conductivity, resistivity and capacitance

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS11680886B2Apparatus and associated methods for detecting air-borne particles

Publication Date: 2023.06.20 NOKIA TECHNOLOGIES OY

AI summary

An apparatus comprising: a body having an aperture dimensioned to receive an air-borne particle of corresponding size; first and second electrodes positioned within the aperture between which a potential difference can be applied; and a measurement circuit configured to measure an electrical property between the first and second electrodes such that the presence of the air-borne particle within the aperture can be detected based on a change in the electrical property when the air-borne particle contacts both the first and second electrodes.