Pressure Sensor Layout With Separate Temperature Sensing
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Solution Overview
Problem
Existing pressure and temperature sensors face challenges in precise measurement due to interference between the pressure and temperature measurement bodies, with delays in temperature changes affecting pressure measurements and requiring individual calibration for each production lot, leading to imprecise results.
Innovation Solution
A pressure and temperature sensor design with separate pressure and temperature measurement bodies arranged on the static side of the sensor body, using a buffering member and through holes to minimize physical changes and interference, allowing for precise correction of pressure measurements based on temperature readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a sensor chip integrally including pressure measurement body and temperature measurement body is used, then device size is reduced, but measurement precision deteriorates due to interference between measurement bodies
Solution Approach 1:
The patent divides the measurement function into separate pressure measurement body and temperature measurement body, each independently arranged in the accommodation space. This segmentation allows each measurement body to be optimized for its specific function without interference from the other, resolving the contradiction between compact integration and measurement precision.
Solution Approach 2:
The patent introduces a transmission substance (such as silicon oil) as an intermediary medium that transmits both pressure and temperature changes from the diaphragm to the respective measurement bodies. This intermediary allows independent measurement while maintaining a compact structure, as the transmission substance serves as a common medium for both measurement functions.
2Speed
If pressure measurement body and temperature measurement body are arranged in the fluid to be measured, then response speed is improved, but reliability deteriorates due to chemical or mechanical damage from the fluid
Solution Approach 1:
The patent uses a diaphragm as an intermediary barrier that separates the fluid to be measured from the measurement bodies. The diaphragm transmits pressure and temperature changes to the measurement bodies while preventing direct contact between the fluid and the measurement bodies, thus maintaining both response speed and reliability.
Solution Approach 2:
The patent replaces direct mechanical contact between the fluid and measurement bodies with a diaphragm-mediated transmission system. This substitution allows the measurement bodies to respond to fluid conditions through the diaphragm without being directly exposed to the fluid, thereby maintaining reliability while preserving response capability.
3Measurement precision
If separate pressure and temperature measurement bodies are used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the pressure measurement body and temperature measurement body into a single integrated sensor device with a common diaphragm and transmission substance system. This combining approach allows separate measurement functions to coexist in a compact structure, improving precision while limiting the increase in overall device complexity through shared components.
Solution Approach 2:
The patent designs the diaphragm and transmission substance system to serve multiple functions: transmitting pressure changes to the pressure measurement body, transmitting temperature changes to the temperature measurement body, and isolating both measurement bodies from the fluid. This multi-functionality reduces the need for separate components, thereby limiting device complexity while maintaining measurement precision.
4Measurement precision
If calibration is performed for each production lot, then measurement precision is improved, but manufacturing cost and time increase
Solution Approach 1:
The patent employs measurement bodies with stable physical properties (such as strain gauges for pressure and thermistors for temperature) that exhibit consistent responses across production lots. By selecting materials and designs with inherent stability, the patent reduces the need for individual calibration, thereby improving manufacturing efficiency while maintaining 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
The sensor achieves precise measurement of pressure and temperature by minimizing interference and temporal delays, ensuring accurate and stable readings even under high-pressure conditions.
Implementation Method 1
a pressure measurement body that outputs a pressure signal in accordance with a pressure of a fluid to be measured
Implementation Method 2
a temperature measurement body that outputs a temperature signal in accordance with a temperature of the fluid to be measured
Implementation Method 3
The pressure measurement body outputs a pressure signal in accordance with a pressure of the transmission substance which receives a pressure of the fluid to be measured via the diaphragm
Implementation Method 4
The temperature measurement body outputs a temperature signal in accordance with a temperature of the transmission substance which receives a temperature of the fluid to be measured via the diaphragm
Data Source
AI summary
Disclosed is a pressure and temperature sensor capable of precisely measuring a pressure. A sensor body, a diaphragm defining an accommodation space together with the sensor body, and a transmission substance charged in the accommodation space are provided, and a pressure measurement body and a temperature measurement body which is a separate body from the pressure measurement body are disposed in the accommodation space.