Sensor Unit for Weathering Chamber Air Flow Measurement
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Solution Overview
Problem
In artificial weathering or light fastness testing devices, accurately measuring and controlling the sample temperature and air mass flow is challenging, which affects the comparability and reliability of test results, especially for polymeric materials where temperature-dependent aging processes occur.
Innovation Solution
A sensor device with a sensor housing containing an air mass sensor and a black standard sensor is integrated into the weathering chamber, using a metallic layer or wire as a sensor element to measure air flow and temperature, allowing for precise temperature control and air flow adjustment, and optionally including UV radiation and humidity sensors for comprehensive testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If air flow and temperature measurement are implemented using conventional sensors, then measurement capability is provided, but measurement precision and reliability are insufficient for accurate material aging simulation
Solution Approach 1:
The patent combines multiple sensing functions into a single integrated sensor device. The sensor housing contains both an air mass sensor with metallic sensor element for air flow measurement and a black standard sensor for temperature measurement, allowing simultaneous and coordinated measurement of multiple parameters that affect material aging.
Solution Approach 2:
The patent introduces a metallic sensor element (such as a metallic wire or mesh) as an intermediary that serves dual purposes: it acts as both the sensing element for air flow measurement and a heating element for maintaining sensor temperature. This intermediary component enables precise measurement while compensating for environmental variations.
2Adaptability or versatility
If comprehensive sensing (air flow, temperature, UV radiation, humidity) is implemented, then measurement completeness is improved, but device complexity increases
Solution Approach 1:
The sensor device is designed with multi-functionality to measure multiple parameters affecting material aging. The housing contains an air mass sensor for air flow measurement, a black standard sensor for temperature measurement, and can optionally include UV radiation sensors and humidity sensors, all within a single integrated unit that provides comprehensive weathering simulation monitoring.
3Measurement precision
If metallic sensor element is used for air flow measurement, then measurement accuracy is improved, but susceptibility to environmental factors increases
Solution Approach 1:
The metallic sensor element functions as both a sensing element and a heating element. By continuously heating the metallic element and measuring its electrical resistance or temperature, the system obtains feedback about air flow conditions. This active heating compensates for environmental factors such as ambient temperature changes, maintaining measurement accuracy despite varying environmental conditions.
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 setup enables accurate temperature control and air flow measurement, enhancing the comparability of test results and allowing for defined air flow adjustments, thereby improving the reliability and consistency of material aging simulations.
Implementation Method 1
an air mass sensor (120) with a sensor element (121), wherein the sensor element (121) is exposed to an air flow prevailing in the weathering chamber (1) in the same way as a sample (3)
Implementation Method 2
at least one black standard sensor (130) is mounted on the sensor housing (110)
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3A~3C
AI summary
The sensor device (100; 200) for a device (10) for weathering or lightfastness testing of samples comprises a sensor housing (110) which is designed such that it can be arranged in a weathering chamber (1) of the device (10) in the same way as a sample (3), and an air mass sensor (120; 220) which has a sensor element (120.2; 220.2) and is attached to the sensor housing (110) such that the sensor element (120.2; 220.2) is exposed to an airflow prevailing in the weathering chamber (1) in the same way as a sample (3).