CO Sensor Drift Compensation via Environmental Data

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Solution Overview

Problem

Electronic sensors, such as those in smoke and carbon monoxide detection devices, are prone to drift due to environmental factors like vibration, contamination, temperature, and humidity, leading to inaccurate and unstable measurements.

Innovation Solution

A hazard detection device equipped with humidity, temperature, and carbon monoxide sensors, along with a processor that calculates corrected CO measurements by determining ambient conditions and applying compensation factors to account for sensor drift, ensuring accurate alerts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the sensing element is physically isolated from the ambient environment, then sensor drift is reduced, but sensitivity is reduced and response time is slowed

Engineering Contradiction:

Improvesensor drift reductionVSAvoidsensitivity

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent segments the compensation approach into multiple independent components: temperature compensation, humidity compensation, and baseline drift compensation. Each component addresses specific environmental factors separately, allowing the sensing element to remain exposed to the environment while maintaining accuracy through software-based corrections rather than physical isolation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the operational parameters of the sensor by adjusting measurement ranges, sampling frequencies, and compensation algorithms based on environmental conditions. The system dynamically modifies these parameters to optimize both sensitivity and drift compensation, avoiding the need for physical isolation that would reduce sensitivity.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If environmental conditions are regulated to stabilize drift, then measurement stability is improved, but device cost and complexity increase

Engineering Contradiction:

Improvemeasurement stabilityVSAvoiddevice complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent implements feedback mechanisms where the system continuously monitors environmental conditions (temperature, humidity) and sensor output, then applies real-time compensation adjustments. The processor compares measured values against expected drift patterns and dynamically corrects readings, achieving measurement stability through intelligent feedback rather than complex physical regulation systems.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces mechanical/environmental regulation systems with software-based compensation algorithms. Instead of using complex temperature control mechanisms or humidity regulation systems, the invention uses digital signal processing and mathematical models to compensate for environmental effects, significantly reducing device complexity while maintaining measurement stability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If manufacturer data on anticipated drift is used for compensation, then drift correction is simplified, but accuracy is limited to expected conditions

Engineering Contradiction:

Improvecompensation implementationVSAvoidcompensation accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent performs preliminary characterization of sensor drift behavior under various environmental conditions during manufacturing or initial operation. This baseline data is stored and used to pre-program compensation algorithms, simplifying implementation while maintaining high accuracy. The system proactively prepares compensation strategies before actual measurement scenarios occur.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic compensation algorithms that adapt to actual operating conditions rather than relying solely on static manufacturer data. The system continuously learns and adjusts compensation parameters based on real-time environmental measurements and sensor behavior, allowing accurate compensation across a wider range of conditions than predetermined data alone would permit.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11493492B2Compensation of environmentally-induced drift in an electrochemical carbon-monoxide sensor

Publication Date: 2022.11.08 GOOGLE LLC

AI summary

Methods of the disclosed subject matter provide compensation for sensor drift in a hazard detection device having a plurality of sensors coupled to a processor to determine that a carbon monoxide sensor is drifting and to compensate for the drift by calculating a corrected carbon monoxide measurement value based on the ambient environmental conditions.