振动惯性加速计
Onera制造了对正交加速很敏感的单片石英传感器。这一感念通过解耦系统解耦，从而有效地与外部振动梁相分离。 它允许最大化振动品质因数，这也是频率稳定所需要的。
整个装置-包括传感器模块都是由Oofeilie软件模拟的，因为它能建立所需要的压电-热-弹性强耦合模型。
当热弹性阻尼是空间（零重力）和真空应用的关键因素，谐振梁被压电所激活。同时，热应力影响频率的行为必须达到最小化。
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The device functionality is based on the piezoelectric actuation of a beam (see red arrow) and the consequent measurement of the frequency shift due to axial stresses exercised on this beam.
The importance of a high Quality factor for the device sentitivity. The Oofelie strongly couple piezo-thermo-elastic simulations give an excellent fit with the measurements.
We simulate the sensor's behavior within a To8 package, which enables us to
- Study the enegergy losses through the mounting parts
- Optimize the resonance quality
- Minimize the effectof thermal stresses on the resonance frequency.
Finally we optimze the accelerator's response together with it's measurement circuit. The measurement circuit is designed to lock into the transducers eigen-frequency for optimizal performance, however the transducer's original response (top left) does not enable this because the electric capacitance intoduced by the structure intoduces an unwanted phase-shift. By adding an electric compensation circuit and optimizing the electric parameters of this circuit, we are able to improve the total system performance (bottom right), cancelling the phase shift, while maintaining the quality factor.