数字输出次声传感器比较校准系统
Comparison calibration system for digital-output infrasound sensors
AI总结：
本研究提出一种数字输出次声传感器的比较校准系统，用于评估MEMS模块的灵敏度模和相位特性，通过时间戳技术实现同步并验证其性能。
摘要：
近期微机电系统（MEMS）的进步使数字输出MEMS模块在次声监测中的应用成为可能。这些模块结合了MEMS压力传感器和微控制器，提供带有时间戳的数字压力数据。与传统模拟次声传感器相比，MEMS模块的经济性和紧凑性使得能够构建具有高密度测量站的次声监测网络。然而，MEMS模块的动态频率响应特性，包括灵敏度模和相位，仍未被评估。在本研究中，我们开发了一种用于数字输出次声传感器的比较校准系统，特别注重确保参考标准的模拟输出与MEMS模块的数字输出之间的相位同步。使用与时间频率标准同步的每秒脉冲信号，我们成功地对参考模拟信号进行了时间戳，实现了参考模拟标准与数字输出传感器之间的同步。在0.2 Hz到4 Hz范围内，对由DPS310 MEMS压力传感器和ESP32微控制器组成的数字输出MEMS模块进行了示例校准。灵敏度模与参考值的匹配度在几个百分点以内，但相位延迟了约10毫秒。我们预计，基于本文报告的结果进行修正将提高数字输出传感器次声测量的可靠性。
英文摘要：
Recent advancements in micro electro-mechanical systems (MEMS) have enabled the application of digital-output MEMS modules in infrasound monitoring. These modules, combining MEMS pressure sensors and microcontrollers, provide timestamped digital pressure data. Compared with conventional analog infrasound sensors, the affordability and compactness of MEMS modules allow the construction of infrasound monitoring networks with a high density of measurement stations. However, dynamic frequency response characteristics of the MEMS modules, including both sensitivity modulus and phase, remain unassessed. In this study, we developed a comparison calibration system for digital-output infrasound sensors, with special attention paid to ensuring phase synchronization between the analog-output of reference standards and the digital-output of MEMS modules. Using a pulse per second signal synchronized with a time frequency standard, we successfully timestamped the reference analog signals, achieving synchronization between reference analog standards and digital-output sensors. Example calibrations were conducted on a digital-output MEMS module consisting of a DPS310 MEMS pressure sensor and an ESP32 microcontroller, in the 0.2 Hz to 4 Hz range. The sensitivity modulus matched the reference within a few percent, but the phase delayed by approximately 10 ms. We anticipate that the appliying corrections based on the results reported herein will enhance the reliability of infrasound measurements with digital-output sensors.
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