A MOEMS Accelerometer Based on Diffraction Grating with Improved Mechanical Structure

DOI Web Site Web Site 参考文献16件
  • Lu Qianbo
    State Key Laboratory of Modern Optical Instrumentation, Zhejiang University
  • Lian Wenxiu
    State Key Laboratory of Modern Optical Instrumentation, Zhejiang University
  • Lou Shuqi
    State Key Laboratory of Modern Optical Instrumentation, Zhejiang University
  • Wang Chen
    State Key Laboratory of Modern Optical Instrumentation, Zhejiang University
  • Bai Jian
    State Key Laboratory of Modern Optical Instrumentation, Zhejiang University
  • Yang Guoguang
    State Key Laboratory of Modern Optical Instrumentation, Zhejiang University

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<p>In this study, an improved MOEMS (micro-optical electronic mechanical system) accelerometer based on integrated grating with phase modulation is proposed. This device is composed of a laser diode, an optoelectronic processing circuit, a sensing chip (consisting of a piezoelectric translator), an integrated grating as a reflective mirror on a transparent substrate, and a mechanical part of a bulk silicon proof mass suspended by four cantilevers whose upper surface acted as another mirror. This device generates a series of interference fringes by two diffracted beams when illuminated with a coherent light source, whose intensities are modulated by the relative distance between the grating and the proof mass. The intensities of the interference fringes varied with alterations in the distance caused by external accelerations that are proportional to the acceleration. The magnitude of acceleration can be calculated by using a differential circuit detecting the distance. The modified structure introduced in this paper obtains high sensitivity and reduces cross-sensitivity between different sensitive axes. The experimental results before the simulation and theory analysis demonstrate that this modified MOEMS accelerometer has a good performance with higher static acceleration sensitivity of 3×103 V/g and very low crosstalk.</p>

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