VOC Sensor Calibration Using Carbon Monoxide Reference
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Solution Overview
Problem
Existing VOC sensors require accurate calibration to ensure reliable air quality monitoring, but existing calibration methods are often inefficient and may not account for sensor degradation over time.
Innovation Solution
A method for calibrating VOC sensors using carbon monoxide (CO) as a calibrant, both during manufacturing and in the field, to ensure accurate and efficient calibration, including re-calibration to account for sensor degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If VOC sensors are calibrated using traditional calibration systems, then calibration accuracy can be maintained, but additional calibration systems and equipment are required for field calibration
Solution Approach 1:
The patent applies universality by making the CO sensor serve multiple functions: it acts as both a detection sensor for CO monitoring and as a calibration reference for VOC sensors. This eliminates the need for separate calibration systems in the field, as the CO sensor can provide calibration functionality using the same sensor that performs CO detection, thereby reducing device complexity while maintaining calibration accuracy
Solution Approach 2:
The system applies self-service by enabling the VOC sensor to calibrate itself using the CO sensor as a reference. The VOC sensor uses the known CO concentration measured by the CO sensor to adjust its own calibration, eliminating the need for external calibration equipment or systems in field conditions
2Reliability
If VOC sensors are calibrated frequently to account for degradation, then monitoring reliability improves, but calibration time and operational complexity increase
Solution Approach 1:
The patent applies continuity of useful action by enabling continuous or periodic calibration of the VOC sensor using the CO sensor as a reference. Instead of requiring periodic removal and manual calibration, the system can perform calibration continuously or at scheduled intervals in-situ, maintaining monitoring reliability while minimizing calibration time and operational disruption
Solution Approach 2:
The system applies preliminary action by performing calibration using the CO sensor before VOC measurements are taken. The CO sensor provides a known reference concentration that is used to pre-calibrate the VOC sensor, ensuring accurate VOC monitoring from the start of each measurement period without requiring time-consuming post-measurement calibration
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 method allows for precise calibration of VOC sensors using CO, reducing the need for additional calibration systems and enabling periodic field calibration without extra equipment, thus ensuring accurate and reliable air quality monitoring.
Implementation Method 1
a CO sensor that is previously calibrated and that is configured to determine a verified amount of CO the detector is exposed to
Implementation Method 2
a volatile organic compound (VOC) sensor that is sensitive to carbon monoxide (CO)... exposing the VOC sensor to the CO
Data Source
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AI summary
A method of calibrating a detector (231) that includes a volatile organic compound, VOC, sensor (200) is provided. The method includes assembling the detector (231) with the VOC sensor (200) for field deployment and calibrating the VOC sensor (200) using carbon monoxide, CO, as a calibrant prior to the field deployment.