Integrated Pellistor Sensor for Gas Detection
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Solution Overview
Problem
Current sensor devices for gas detection face challenges in sensitivity and accuracy, particularly when using pellistor elements, as they often require separate heater and temperature sensor components, which increase device size and power consumption, and are sensitive to environmental changes like humidity and temperature.
Innovation Solution
The design incorporates a sensor device with pellistor elements that share a common heater element and temperature sensor element, or use separate components optimized for sensitivity, arranged on a common substrate and membrane, and employs a Wheatstone Bridge configuration with active and reference pellistor elements to cancel out environmental changes, eliminating the need for discrete resistors and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate heater and temperature sensor components are used in pellistor elements, then the sensor device can maintain basic functionality, but the device size and power consumption increase
Solution Approach 1:
The patent combines the heater element and temperature sensor element into a single integrated pellistor element structure. The temperature sensor element is positioned in thermal contact with the heater element, allowing both functions to coexist in a compact configuration rather than requiring separate components, thus reducing device size while maintaining functionality
Solution Approach 2:
The pellistor element is designed to serve multiple functions simultaneously: the heater element provides thermal energy for gas detection, while the temperature sensor element monitors temperature for compensation purposes. This multi-functional integration within a single element structure reduces the overall device size compared to using separate dedicated components for each function
2Reliability
If separate heater and temperature sensor components are used in pellistor elements, then the sensor device can maintain basic functionality, but power consumption increases
Solution Approach 1:
The integrated design allows the temperature sensor element to leverage the thermal field generated by the heater element, reducing the need for separate heating and sensing power sources. The close thermal coupling enables efficient energy utilization where the heater's thermal output directly serves the temperature measurement function
Solution Approach 2:
The temperature sensor element utilizes the thermal environment created by the heater element for its operation, effectively using the heater's thermal output as its measurement field without requiring additional power input. The system uses its own operational byproducts (heat from heater) to enable the sensing function, reducing overall power consumption
3Device complexity
If traditional pellistor configuration is used, then the device structure is simple, but sensitivity and accuracy in gas concentration measurement are reduced
Solution Approach 1:
The temperature sensor element is positioned in a specific location with optimized thermal contact to the heater element, creating a localized high-sensitivity measurement zone. This strategic placement ensures maximum thermal coupling for accurate temperature measurement while maintaining overall structural simplicity
Solution Approach 2:
The patent changes the temperature parameter measurement capability by incorporating a dedicated temperature sensor element with specific temperature-dependent electrical resistance characteristics. This allows for precise temperature compensation that enhances gas concentration measurement accuracy without significantly increasing structural complexity
4Quantity of substance
If pellistor elements are sensitive to environmental changes like humidity and temperature, then the sensor can detect gas concentration, but measurement accuracy decreases due to environmental interference
Solution Approach 1:
The temperature sensor element provides continuous temperature feedback that is used to compensate for environmental temperature variations affecting the gas detection measurement. This feedback mechanism allows the system to distinguish between temperature-induced resistance changes and gas-concentration-induced resistance changes, maintaining measurement accuracy despite environmental fluctuations
Solution Approach 2:
The temperature sensor element acts as an intermediary that measures environmental temperature changes and enables computational compensation of these effects on the gas detection signal. By introducing this intermediate measurement capability, the system can mathematically compensate for environmental interference and maintain accurate gas concentration measurements
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 configuration reduces device size and power consumption while improving sensitivity and accuracy in gas concentration measurement, effectively canceling out environmental influences and increasing measurement precision by a factor of 2.
Implementation Method 1
the heater element can increase the temperature of the pellistor element or of at least a part of the pellistor element
Implementation Method 2
the temperature sensor element can comprise a material which changes its electrical resistance depending on its temperature
Implementation Method 3
A pellistor element embodied as a catalytic pellistor comprises a catalyst element and, when operated by heating at least the catalyst element by means of the heater element, works by burning a gas to be examined (target gas) on the surface of the catalyst element
Implementation Method 4
works by burning a gas to be examined (target gas) on the surface of the catalyst element
Implementation Method 5
The temperature sensor element of the TC pellistor element, when the pellistor element is operated by heating the pellistor element by means of the heater element to a certain temperature, measures a temperature of the pellistor element which is influenced by the heat conductivity of the gas to be examined
Data Source
AI summary
A sensor device and an electronic assembly are disclosed. In an embodiment a sensor device includes a first pellistor element, a second pellistor element, a heater element, a first temperature sensor element and a second temperature sensor element, wherein the heater element and the first temperature sensor element are part of the first pellistor element and the heater element and the second temperature sensor element are part of the second pellistor element.