Humidity Sensor Heating Control for Accurate Water Vapor Pressure
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Solution Overview
Problem
Existing physical quantity measurement systems for gas mixtures in high-humidity environments suffer from condensation issues that degrade the accuracy of water vapor pressure measurement.
Innovation Solution
A physical quantity measurement system incorporating a temperature and humidity sensor, a heat generator, and a heat generation controller that adjusts the measurement method based on humidity levels to prevent condensation and accurately measure water vapor pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a hygrometer is used to measure water vapor concentration in high-humidity gas mixtures, then the water vapor pressure can be obtained from the humidity measurement, but condensation occurs in the hygrometer which degrades measurement accuracy
Solution Approach 1:
The system performs preliminary heating of the measurement channel and hygrometer before humidity measurement to prevent condensation. The control unit activates the heating element in advance, raises the temperature above dew point, and only then allows humidity measurement to occur, eliminating the condensation problem while maintaining measurement accuracy.
Solution Approach 2:
The system changes the temperature parameter of the measurement environment by actively heating the measurement channel and hygrometer. By controlling the temperature to remain above the dew point through feedback from temperature and humidity sensors, the system prevents condensation while enabling accurate water vapor pressure measurement in high-humidity conditions.
2Measurement precision
If the temperature and humidity sensor operates in high-humidity environment without heating, then energy consumption is reduced, but condensation is produced which degrades measurement accuracy
Solution Approach 1:
The system uses temperature and humidity sensors to continuously monitor the measurement environment and feeds this information back to the control unit. Based on the feedback, the control unit adjusts the heating element to maintain temperature above dew point, achieving accurate measurements while minimizing energy consumption by heating only when necessary.
Solution Approach 2:
The system employs periodic heating cycles rather than continuous heating. The control unit activates heating based on detected humidity levels and temperature conditions, turning it on when condensation risk is detected and turning it off when conditions are safe, thereby reducing overall energy consumption while preventing condensation during critical measurement periods.
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 maintains measurement accuracy by dynamically adjusting the measurement method, ensuring precise determination of water vapor pressure even in high-humidity conditions.
Implementation Method 1
The heat generator performs a heat generating operation that generates heat to warm the temperature and humidity sensor
Implementation Method 2
The temperature and humidity sensor measures a humidity and temperature of gas mixtures flowing through a flow channel
Implementation Method 3
The water vapor pressure measurer measures a water vapor pressure of water vapor included in the gas mixtures
Data Source
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AI summary
The problem to be overcome by the present disclosure is to more accurately measure the water vapor pressure of gas mixtures even when the gas mixtures flow through a flow channel under a high-humidity environment. A physical quantity measurement system (1) includes a temperature and humidity sensor (16), a heat generator (17), a heat generation controller (203), and a water vapor pressure measurer (204). The temperature and humidity sensor (16) measures a humidity and temperature of gas mixtures flowing through a flow channel (101). The heat generator (17) performs a heat generating operation that generates heat to warm the temperature and humidity sensor (16). The heat generation controller (203) controls the heat generating operation. The water vapor pressure measurer (204) measures a water vapor pressure of water vapor included in the gas mixtures. The heat generation controller (203) controls the heat generating operation by the heat generator (17) based on a result of comparison between a humidity measured value of the gas mixtures that has been measured by the temperature and humidity sensor (16) and a threshold value. The water vapor pressure measurer (204) calculates the water vapor pressure by changing a measurement method depending on a condition satisfied based on the humidity measured value.