NO Sensor Humidifier Electrolyte Membrane Selectivity
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Solution Overview
Problem
Current NO detection methods face challenges in miniaturization and selective detection of nitric oxide (NO) in vapor streams, particularly in the ppb range, and struggle to differentiate NO from CO2 and CO hydrocarbons effectively.
Innovation Solution
A NO sensing system that includes an inlet, a humidifier to increase sample humidity, and a sensor array with multiple sensors connected in series, which generates a potential difference indicative of NO levels, using a Platinum Zeolite Y filter to remove interfering gases, and operates within a specific temperature range to enhance sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical spectroscopy, mass spectrometry, chromatography, chemiluminescence, or electrochemistry methods are used for NO detection, then detection capability is achieved, but device miniaturization is limited
Solution Approach 1:
The patent replaces complex mechanical/optical detection systems (spectroscopy, mass spectrometry) with a solid-state electrochemical sensor that uses ionic conduction through an electrolyte membrane to detect NO, enabling miniaturization while maintaining detection capability
Solution Approach 2:
The patent changes the operating parameters by using a specific temperature range (300-600°C) and controlling humidity levels to optimize the electrochemical sensor's sensitivity and selectivity for NO detection in the ppb range
2Measurement precision
If conventional sensors are used in vapor streams, then detection is possible, but selective detection of NO against CO2, CO, and hydrocarbons is difficult
Solution Approach 1:
The patent introduces an electrolyte membrane as an intermediary between the vapor stream and the sensor electrode, which selectively permits NO to reach the sensing surface while blocking or reducing the impact of interfering gases like CO2, CO, and hydrocarbons
Solution Approach 2:
The patent creates a localized chemical environment at the sensor surface by controlling humidity and temperature, which enhances the sensor's selectivity for NO through localized electrochemical reactions while being less responsive to other gases
3Measurement precision
If detection sensitivity is increased for ppb range NO, then detection capability improves, but interference from water and other gases increases
Solution Approach 1:
The patent applies preliminary action by pre-humidifying the vapor stream before it reaches the sensor and maintaining controlled humidity at the sensor surface, which prepares the electrochemical environment to enhance NO sensitivity while managing water interference through controlled conditions rather than complete elimination
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 effectively detects NO in the ppb range with improved sensitivity, capable of differentiating NO from CO and CO2, and achieves reliable measurements in both breath and combustion environments by minimizing interference from water and other gases.
Implementation Method 1
The sensor is an electrochemical sensor and generates a potential difference in response to presence of nitric oxide (NO)
Data Source
AI summary
An NO sensing system includes an inlet for receiving an original sample, a humidifier, fluidly communicating with the inlet, and a first sensor. The original sample is fluidly transmitted through the humidifier and exits the humidifier as a humidified sample having a humidity above a predetermined level. The first sensor generates a potential difference in response to presence of NO in the humidified sample. The potential difference is indicative of a level of NO within the original sample.