Measuring Air Speed With a Low-Power MEMS Ultrasonic Anemometer via Adaptive Phase Tracking
Measuring Air Speed With a Low-Power MEMS Ultrasonic Anemometer via Adaptive Phase Tracking
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DOI：
10.1109/jsen.2019.2920648
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发表时间：
2019-09-15
影响因子：
4.3
通讯作者：
Arens, Edward
中科院分区：
文献类型：
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作者：
Ghahramani, Ali;Zhu, Megan;Arens, Edward
室内空气流动影响建筑物的许多功能，包括通风和空气质量，居住者的舒适和健康，消防安全和建筑能源使用。长期以来，对空气运动的精确测量一直是困难和昂贵的，特别是对于低于1 m/s的速度。一种新型的高频超声波收发器通过微机电系统（MEMS）制造提供高灵敏度测量和低成本。然而，在高频下，传统的超声信号处理算法仅在小范围的环境温度和速度上起作用。在本文中，我们描述了三种算法，使用超声波脉冲的复相位角来测量温度和温度的温度和速度的扩展范围。他们采用光学跟踪测量相位角的振动周期。这些方法应用于基于脉冲的风速计，其176 kHz MEMS收发器既发送又接收。在0 - 4 m/s之间的风洞测试中，具有低通滤波器的跟踪算法以高灵敏度和准确度（0.026 m/s平均绝对误差）测量空气速度。以如此低的功耗和低成本实现如此精确的监测能力目前在业界是前所未有的。
Indoor air movement affects many functions of buildings, including ventilation and air quality, comfort and health of occupants, fire safety, and building energy use. Accurate measurement of air movement has been difficult and expensive over the extended periods of time, especially for velocities below 1 m/s. A new type of high frequency ultrasonic transceiver provides high sensitivity measurements and low cast through microelectromechanical systems (MEMS) manufacturing. However, at high frequencies, the conventional ultrasonic signal processing algorithms function only over small ranges of ambient temperature and velocity. In this paper, we describe three algorithms that use the complex phase angle of an ultrasonic pulse to measure velocity and temperature over extended ranges of temperature and velocity. They employ heuristics to track the vibration cycle of the measured phase angle. These methods are applied in a pulse-based anemometer whose 176 kHz MEMS transceivers both transmit and receive. In wind tunnel tests between 0-4 m/s, the tracking algorithm with a low-pass filter measured air speed with high sensitivity and accuracy (0.026 m/s mean absolute error). The ability to monitor to this accuracy with such low power draw and low cost is currently unprecedented in the industry.