MEMS Resonant Accelerometer Thermal Expansion Compensation

The patent applies thermal expansion principles by designing the elastic body and inertial masses with specific geometric configurations that cause them to expand or contract in controlled ways when temperature changes. The elastic body is designed with an opening portion that allows the tuning fork to penetrate, creating a structure where thermal expansion of the elastic body compensates for thermal expansion of the inertial masses, thereby minimizing temperature sensitivity and improving measurement accuracy.

The patent employs asymmetric design in the elastic body's geometric configuration, particularly in the opening portion's shape and position. This asymmetric structure creates unequal thermal expansion characteristics between different parts of the device, allowing the elastic body to compensate for thermal effects in the inertial masses. The asymmetric design enables the tuning fork to experience net zero thermal stress while still responding to external acceleration.

The patent applies homogeneity by designing the elastic body and inertial masses to have matching thermal expansion coefficients. This homogeneous thermal response ensures that when temperature changes, all components expand or contract proportionally, preventing differential thermal stress that would otherwise affect the tuning fork's resonance frequency. The homogeneous design allows the system to maintain stable resonance characteristics across temperature variations.

The patent utilizes parameter changes by carefully selecting and adjusting the thermal expansion coefficients of the materials used in the elastic body and inertial masses. By changing the material parameters to achieve matching thermal expansion characteristics, the system minimizes temperature sensitivity. The parameter optimization allows the device to maintain measurement precision across different operating temperatures.

The patent applies segmentation by dividing the elastic body into distinct functional regions, including an opening portion that separates the inertial masses from the tuning fork attachment point. This segmented structure allows each component to perform its specific function while enabling thermal expansion compensation. The opening portion creates a mechanical advantage that allows the tuning fork to be positioned optimally for both acceleration sensing and thermal effect compensation.

The patent employs dimensional change by introducing a spatial configuration where the tuning fork extends through the opening portion of the elastic body in a direction perpendicular to the main inertial mass movement axis. This three-dimensional arrangement creates a geometric relationship where thermal expansion in one dimension does not directly translate to stress in the measurement dimension, thereby compensating for temperature effects while maintaining manufacturing simplicity.