Dew Point Measurement Using Elevation-Based Pressure Correction
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Solution Overview
Problem
Conventional dew point temperature measuring devices are cumbersome due to the need for a mirror surface cooling mechanism, manual dew removal, and lack of automatic control and recording, and they require a barometric pressure sensor, which increases cost and size, making them unsuitable for applications like car interiors where barometric pressure changes frequently.
Innovation Solution
A humidity measuring device that calculates barometric pressure based on elevation, allowing for relative humidity and dew point temperature measurement without a barometric pressure sensor, using a humidity measuring unit, elevation obtaining unit, barometric pressure calculating unit, humidity correcting unit, and dew point temperature calculating unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a barometric pressure sensor is used to correct humidity measurements, then measurement accuracy under varying pressure conditions is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the barometric pressure sensing function from a dedicated pressure sensor and implements it through elevation detection instead. By removing the pressure sensor component and replacing its function with an elevation-based calculation system, the device complexity is reduced while maintaining the ability to correct humidity measurements for pressure variations.
Solution Approach 2:
The elevation obtaining unit serves multiple functions: it determines the device's altitude position and enables barometric pressure calculation for humidity correction. This multi-functional approach replaces what would traditionally require separate pressure sensing components, thereby reducing device complexity while preserving measurement accuracy.
2Measurement precision
If a barometric pressure sensor is used to correct humidity measurements, then measurement accuracy under varying pressure conditions is improved, but device cost increases
Solution Approach 1:
The patent removes the expensive barometric pressure sensor component from the device while extracting its essential function (pressure information for humidity correction) and achieving it through elevation-based calculation, thereby reducing manufacturing cost while maintaining measurement accuracy.
Solution Approach 2:
The patent employs cheaper elevation detection methods (such as GPS or barometric altitude from the same sensor used for other purposes) instead of expensive dedicated pressure sensors, reducing overall device cost while maintaining the capability to correct humidity measurements for pressure variations.
3Measurement precision
If mirror surface cooling mechanism is used for dew point temperature measurement, then measurement accuracy is improved, but device complexity and size increase
Solution Approach 1:
The patent replaces the mechanical mirror surface cooling system with an electronic calculation-based dew point temperature measurement system. By substituting the complex mechanical cooling mechanism with computational methods that use temperature and humidity sensor data, the device complexity is significantly reduced while maintaining measurement accuracy.
Solution Approach 2:
The patent changes the measurement approach from direct physical cooling of a mirror surface to calculating dew point temperature based on measured temperature and humidity parameters. This parameter-based calculation method eliminates the need for complex cooling mechanisms while preserving measurement accuracy.
4Measurement precision
If mirror surface cooling mechanism is used for dew point temperature measurement, then measurement accuracy is improved, but device size increases
Solution Approach 1:
The patent replaces the bulky mechanical mirror surface cooling system with a compact electronic calculation system. By substituting physical cooling infrastructure with computational algorithms running on standard microcontrollers, the device size is dramatically reduced while maintaining dew point temperature measurement accuracy.
Solution Approach 2:
The patent transitions from a physical cooling-based measurement method requiring large infrastructure to a parameter calculation method that can be implemented in compact form factors, thereby reducing device size while preserving measurement precision.
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
Enables accurate measurement of relative humidity and dew point temperature while eliminating the need for a barometric pressure sensor, facilitating miniaturization and cost reduction, and allowing for automatic control and correction of dew point temperature in varying barometric conditions.
Implementation Method 1
an elevation obtaining unit (2) that obtains an elevation of a point where the humidity measuring device (100) is located
Implementation Method 2
a barometric pressure calculating unit (3) that calculates barometric pressure at the point on a basis of the elevation obtained by the elevation obtaining unit (2)
Implementation Method 3
a humidity correcting unit (4) that corrects relative humidity on a basis of a barometric pressure value calculated by the barometric pressure calculating unit (3)
Implementation Method 4
a dew point temperature calculating unit (6) that calculates dew point temperature by using the relative humidity corrected by the humidity correcting unit (4) and the temperature measured by the temperature measuring unit (5)
Data Source
AI summary
Relative humidity or dew point temperature depending on changes in barometric pressure is measured without using any barometric pressure sensor. A humidity measuring device includes an elevation obtaining unit configured to obtain elevation of a humidity measurement point, a barometric pressure calculating unit configured to calculate barometric pressure at the humidity measurement point from a calculation formula into which a value of the elevation obtained by the elevation obtaining unit is input, and a humidity correcting unit configured to correct humidity on a basis of a barometric pressure value calculated by the barometric pressure calculating unit.