Fiber Bragg Gratings (FBGs) are known for their high sensitivity towards strain and temperature variation. In this manuscript, the strain sensing property of FBG is utilized and explored for measuring weight using a common binocular shaped cantilever type load cell. The shift in Bragg wavelength due to load application is converted into optical power variation using edge filter detection technique. Furthermore, change in optical power is converted into voltage variation and is feed to the Raspberry Pi via analog to digital converter (ADC ADS1115) for real-time and continuous online monitoring of weights. The optical load cell has shown linear response for applied weight up to 8kg. Mechanical properties of optical load cell such as nonlinearity, hysteresis, repeatability, creep and safe over load are studied in detail. Message Queuing Telemetry Transport (MQTT) protocol is used to send data from Raspberry Pi to IoT cloud. The system has achieved resolution of 20g with error of ± 50g.

中文翻译：

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基于低成本FBG的在线重量监测系统

光纤布拉格光栅 (FBG) 以其对应变和温度变化的高灵敏度而闻名。在这份手稿中，利用和探索了 FBG 的应变传感特性，以使用常见的双筒形悬臂式称重传感器测量重量。使用边缘滤波器检测技术将由于负载应用而导致的布拉格波长偏移转换为光功率变化。此外，光功率的变化被转换为电压变化，并通过模数转换器 (ADC ADS1115) 馈送到 Raspberry Pi，用于实时和连续在线监控重量。光学称重传感器对高达 8 公斤的施加重量显示出线性响应。详细研究了光学称重传感器的机械特性，如非线性、滞后、重复性、蠕变和安全过载。消息队列遥测传输 (MQTT) 协议用于将数据从 Raspberry Pi 发送到 IoT 云。系统实现了20g的分辨率，误差为±50g。