Thermal Stress in MEMS

Wang, Yunda; Kong, Ming; Lee, Yung-Chen

doi:10.1007/978-94-007-2739-7_275

Cited by 4 publications

(1 citation statement)

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“…The sensors are glued to the sensor plate to achieve small device sizes. As stated by [18], "the performance of a MEMS device can be strongly affected by thermal stresses resulting from constraining interactions among device's multiple layers and between the package and the device". Referring to the camera design, changes of the camera temperature may have strong impact on the camera geometry stability and thus on the measurement accuracies compared to e.g., DSLR cameras.…”

Section: Introductionmentioning

confidence: 99%

Assessing the Influence of Temperature Changes on the Geometric Stability of Smartphone- and Raspberry Pi Cameras

Elias

Eltner

Liebold

et al. 2020

Sensors

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Knowledge about the interior and exterior camera orientation parameters is required to establish the relationship between 2D image content and 3D object data. Camera calibration is used to determine the interior orientation parameters, which are valid as long as the camera remains stable. However, information about the temporal stability of low-cost cameras due to the physical impact of temperature changes, such as those in smartphones, is still missing. This study investigates on the one hand the influence of heat dissipating smartphone components at the geometric integrity of implemented cameras and on the other hand the impact of ambient temperature changes at the geometry of uncoupled low-cost cameras considering a Raspberry Pi camera module that is exposed to controlled thermal radiation changes. If these impacts are neglected, transferring image measurements into object space will lead to wrong measurements due to high correlations between temperature and camera’s geometric stability. Monte-Carlo simulation is used to simulate temperature-related variations of the interior orientation parameters to assess the extent of potential errors in the 3D data ranging from a few millimetres up to five centimetres on a target in X- and Y-direction. The target is positioned at a distance of 10 m to the camera and the Z-axis is aligned with camera’s depth direction.

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Section: Introductionmentioning

confidence: 99%