Multi-Channel Gas Sensor Bias Circuit for Low-Power Detection

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Solution Overview

Problem

Conventional digital gas sensor systems are limited in their ability to accurately detect multiple gases simultaneously at low concentrations, are cumbersome, expensive, and require frequent calibration, making them unsuitable for applications like air quality monitoring and wearable devices.

Innovation Solution

A nano gas sensor architecture featuring a sensor array with hybrid nanostructures and molecular formulations, an analog front-end for signal detection and conversion, and a digital back-end for data processing, enabling simultaneous detection of multiple gases with low detection limits and self-calibration capabilities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional digital gas sensor systems are used to detect multiple gases simultaneously, then measurement capability is improved, but device complexity and cost increase

Engineering Contradiction:

Improveability to detect multiple gases simultaneouslyVSAvoidsystem complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The sensor system is divided into multiple independent sensing channels, each with dedicated biasing circuitry and ADC conversion. This segmentation allows simultaneous detection of multiple gases without signal interference while keeping each channel's complexity manageable and identical to conventional single-channel designs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sensor array uses identical sensing elements and circuitry configurations for each channel, making the system universal in its approach. Each channel can detect different gas types through selective functionalization, providing multi-gas detection capability without requiring fundamentally different detection mechanisms for each gas type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If conventional gas sensors are used with fixed sampling intervals, then ease of operation is improved, but measurement precision deteriorates

Engineering Contradiction:

Improvefixed sampling methodologyVSAvoiddetection accuracy at low concentrations

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The system employs periodic sampling of each sensing channel at fixed intervals, similar to conventional single-sensor systems. This maintains operational simplicity while the multi-channel array compensates for precision limitations through redundant measurements and statistical analysis of multiple simultaneous readings.

Inventive Principle:

Principle #19Periodic action

3Measurement precision

If measurement circuitry is duplicated for multiple sensors, then measurement precision is improved, but power consumption increases

Engineering Contradiction:

Improveaccuracy of gas detectionVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

Each sensing channel has its own dedicated biasing circuit and ADC converter, segmenting the measurement function across multiple independent units. This segmentation enables precise simultaneous measurement of multiple gases while allowing the system to power only the necessary channels based on detection requirements, potentially reducing overall power consumption compared to multiplexed approaches.

Inventive Principle:

Principle #1Segmentation

4Ease of manufacture

If commercially available gas sensors are used, then ease of manufacture is improved, but detection precision and selectivity deteriorate

Engineering Contradiction:

Improveavailability of commercial sensorsVSAvoiddetection limit and selectivity

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The sensing elements are functionalized with specific molecular formulations that change the physical-chemical parameters of the sensor surface. This functionalization enables the sensors to detect specific gases at parts-per-billion concentrations with high selectivity, significantly improving detection precision and selectivity over conventional unfunctionalized commercial sensors while maintaining compatibility with standard manufacturing processes.

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

The system achieves granular gas information collection with high sensitivity, compatibility with small form factors, and reduced power consumption, enabling applications in air quality monitoring and wearable devices without the need for frequent recalibration.

Implementation Method 1

each of the plurality of sensing elements comprises a resistance and a capacitance, and wherein at least one resistance and capacitance are altered when the interacting with gaseous chemical compounds

Methodology Applied

Scientific EffectResistivity change: Electrical Resistivity Tomography

Implementation Method 2

Methodology Applied

Scientific EffectCapacitance change: Capacitance

Data Source

PatentUS11215594B2Low power circuitry for biasing a multi-channel gas sensor array and to act as a transducer for a digital back-end

Publication Date: 2022.01.04 AERNOS INC

AI summary

A nanomaterial-based gas sensor system comprising a low voltage circuitry which includes a transducer to detect changes in electrical properties of a multi-channel gas sensor array, analog signal conditioning, and an A/D conversion to provide a signal to a digital back-end.