Low cost MEMS accelerometer and microphone based condition monitoring sensor, with LoRa and Bluetooth Low Energy radio

IF 2 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

HardwareX Pub Date : 2024-03-26 DOI:10.1016/j.ohx.2024.e00525

Morten Opprud Jakobsen

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引用次数: 0

Abstract

Vibration-based Condition Monitoring (CM) is an essential tool for identifying potential defects in industrial machinery. However, the implementation of an efficient CM system often necessitates the use of high-cost accelerometers with a large bandwidth. To address this challenge, this study introduces a low-cost CM sensor composed of an ultrasonic MEMS microphone - SPH0641LU and an ADXL1002 MEMS accelerometer. The combination of these two sensor types allows for comparative analysis of the captured data. The SPH641LU microphone is capable of detecting audible vibration signals with a frequency range up to 80 kHz, while the ADXL1002 accelerometer can measure vibrations up to 21 kHz. In addition a three axis ultra low power accelerometer is included, allowing measurement of unbalance or rotating speed, below 200Hz. Moreover, the sensor is designed to operate on battery power and provides the capability for raw data transmission via Bluetooth Low Energy (BLE) or the transmission of pre-processed features from the raw data using LoRaWAN.

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基于 MEMS 加速计和麦克风的低成本状态监测传感器，配备 LoRa 和蓝牙低能耗无线电

基于振动的状态监测（CM）是识别工业机械潜在缺陷的重要工具。然而，要实施高效的状态监测系统，往往需要使用带宽较大的高成本加速度计。为应对这一挑战，本研究引入了一种低成本 CM 传感器，由超声波 MEMS 麦克风 SPH0641LU 和 ADXL1002 MEMS 加速计组成。这两种传感器的组合可对捕获的数据进行比较分析。SPH641LU 麦克风能够检测频率范围高达 80 kHz 的可听振动信号，而 ADXL1002 加速计能够测量高达 21 kHz 的振动。此外，还包括一个三轴超低功耗加速度计，可测量低于 200Hz 的不平衡或旋转速度。此外，该传感器可使用电池供电，并可通过低功耗蓝牙 (BLE) 传输原始数据，或使用 LoRaWAN 传输原始数据中的预处理特征。

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来源期刊

HardwareX Engineering-Industrial and Manufacturing Engineering

CiteScore

4.10

自引率

18.20%

发文量

124

审稿时长

24 weeks

期刊介绍： HardwareX is an open access journal established to promote free and open source designing, building and customizing of scientific infrastructure (hardware). HardwareX aims to recognize researchers for the time and effort in developing scientific infrastructure while providing end-users with sufficient information to replicate and validate the advances presented. HardwareX is open to input from all scientific, technological and medical disciplines. Scientific infrastructure will be interpreted in the broadest sense. Including hardware modifications to existing infrastructure, sensors and tools that perform measurements and other functions outside of the traditional lab setting (such as wearables, air/water quality sensors, and low cost alternatives to existing tools), and the creation of wholly new tools for either standard or novel laboratory tasks. Authors are encouraged to submit hardware developments that address all aspects of science, not only the final measurement, for example, enhancements in sample preparation and handling, user safety, and quality control. The use of distributed digital manufacturing strategies (e.g. 3-D printing) is encouraged. All designs must be submitted under an open hardware license.