MEMS Sensor Embedded Heater for Thermal Gradient Compensation
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Solution Overview
Problem
Portable electronic devices with MEMS pressure sensors face challenges in temperature sensitivity calibration, leading to inaccurate elevation measurements due to thermal gradients and mechanical strain, which existing technologies fail to address effectively.
Innovation Solution
An enhanced MEMS sensor device with an embedded heater, featuring an array of heating elements and a control feedback system to ensure uniform temperature distribution, which compensates for thermal gradients and mechanical strain by adjusting the drive current and power dissipation to maintain a specified temperature profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensitivity calibration is performed without uniform heating, then calibration can be completed quickly, but measurement precision deteriorates due to thermal gradients and mechanical strain
Solution Approach 1:
The heating system is divided into multiple independent heating elements arranged in an array across the substrate. Each heating element can be independently controlled to generate heat, allowing for localized temperature adjustment and uniform heat distribution across different regions of the MEMS sensor device.
Solution Approach 2:
A control system continuously monitors the temperature distribution across the MEMS sensor device and adjusts the drive current to each heating element in real-time. This feedback mechanism ensures uniform temperature maintenance by compensating for thermal gradients and preventing mechanical strain, thereby achieving precise temperature sensitivity calibration.
2Measurement precision
If heating elements are added to achieve uniform temperature distribution, then temperature sensitivity calibration improves, but device complexity increases
Solution Approach 1:
The array of heating elements serves multiple functions: they provide uniform heating for temperature sensitivity calibration, maintain stable operating temperature during sensor operation, and prevent thermal gradients that could cause mechanical strain. This multi-functionality justifies the added complexity by delivering significant performance improvements in elevation measurement accuracy.
Solution Approach 2:
The control system dynamically adjusts the drive current parameters to each heating element based on real-time temperature feedback. By changing electrical parameters (current magnitude and distribution) rather than physical structure, the system achieves uniform temperature distribution and compensates for thermal effects, improving elevation measurement accuracy without requiring complex mechanical modifications.
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 solution provides precise temperature sensitivity calibration and accurate elevation measurements by maintaining uniform heating across the MEMS sensor, reducing errors caused by thermal gradients and mechanical strain.
Implementation Method 1
The array of heating elements can be driven by a control system to uniformly heat the MEMS sensor device
Data Source
AI summary
Aspects of the subject technology relate to an apparatus including a housing and a substrate. The apparatus further includes a sensor, an integrated circuit mounted on the substrate, and one or more heating elements configured to adjust a temperature of the sensor to facilitate measurement of temperature sensitivity and calibration of the sensor.