Portable NDIR CO2 Monitoring for Accurate Real-Time Alerts

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Solution Overview

Problem

Existing portable air quality sensors either inaccurately infer CO2 levels or require external power and are bulky, failing to provide direct, real-time measurements that affect human cognitive performance and productivity.

Innovation Solution

A portable CO2 measuring device with a non-dispersive infrared sensor that directly measures CO2 concentration, connected to a mobile device for real-time data display and notification, offering compact design and intuitive Brain Fuel indexing for user awareness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If portable air quality sensors use chemoresistant MOS sensors to measure VOC and IAQ, then the device can be made portable and compact, but the CO2 level measurement becomes indirect and inaccurate

Engineering Contradiction:

ImproveCO2 measurement accuracyVSAvoiddevice portability

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces chemoresistant MOS sensors with a non-dispersive infrared (NDIR) sensor that directly measures CO2 concentration through optical absorption. This substitution enables accurate direct CO2 measurement in a portable device by using optical physics rather than chemical resistance methods, resolving the contradiction between measurement accuracy and device portability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the measurement parameter from indirect VOC/IAQ inference to direct CO2 concentration measurement by implementing an NDIR sensor that detects CO2-specific infrared absorption at 4.26 micrometers wavelength. This parameter change enables precise direct CO2 measurement while maintaining portable device form factor

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If non-portable CO2 sensors are used to directly measure CO2 levels, then measurement accuracy improves, but the device becomes too big and bulky to carry

Engineering Contradiction:

ImproveCO2 measurement accuracyVSAvoiddevice portability

Core Design Contradiction:

Measurement precisionVSWeight of moving object

Solution Approach 1:

The patent employs a compact NDIR sensor module that integrates optical components, CO2-selective filter, and detector in a miniaturized configuration. This optical-based measurement system replaces bulky traditional CO2 sensors, achieving direct accurate CO2 measurement in a portable form factor that can be carried by users

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent integrates the NDIR sensor, microcontroller, battery, and communication modules into a nested compact structure where smaller components are housed within the main device body. This nested arrangement minimizes overall device volume and weight while maintaining all necessary functions for accurate portable CO2 measurement

Inventive Principle:

Principle #7Nested doll (Nesting)

3Reliability

If portable CO2 measuring device provides real-time continuous monitoring, then user health and productivity benefits improve, but energy consumption increases

Engineering Contradiction:

Improvereal-time monitoring capabilityVSAvoidbattery power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic CO2 measurement cycles rather than truly continuous monitoring, taking measurements at predetermined intervals (e.g., every few seconds or minutes). This periodic action maintains reliable real-time monitoring capability while significantly reducing average power consumption compared to continuous measurement, extending battery life for portable use

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent incorporates feedback mechanisms where the device monitors CO2 levels and provides real-time feedback to users through displays or mobile app notifications. The system also uses feedback to adjust measurement frequency based on detected CO2 conditions, intensifying monitoring when CO2 levels change and reducing frequency when stable, thereby optimizing the balance between monitoring reliability and power consumption

Inventive Principle:

Principle #23Feedback

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 users to quickly and accurately monitor CO2 levels, improving health and productivity by avoiding unsafe concentrations through direct measurement and intuitive feedback.

Implementation Method 1

the portable CO2 measuring device includes a non-dispersive infrared sensor arranged to measure CO2 concentration

Methodology Applied

Scientific EffectInfrared absorption: Absorption (EM radiation)

Data Source

PatentUS12487173B2Portable CO2 measuring device and system

Publication Date: 2025.12.02 WOODENSHARK LLC

AI summary

There is disclosed a system including a portable CO2 measuring device and a mobile device, the mobile device including a processor and a display, the mobile device storing software, the mobile device configured to communicate with the portable CO2 measuring device, the portable CO2 measuring device configured to measure CO2 measurement data, wherein the software is executable on the mobile device to receive the CO2 measurement data from the CO2 measuring device, and to display CO2 measurement results derived from the CO2 measurement data on the display of the mobile device.