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The wearable/ambulatory FBG interrogator consists of a miniature interrogator (FiSpec FBG X100, FiSens, Rolleiwerke GmbH) and a microcontroller (ESP32 WROOM 32D, Espressif, Shanghai) communicated using UART, then signal information transmitted is parsed in the microcontroller and streamed in a web application via Wi-Fi. The power management of the device uses batteries with a typical cycle life of 300 – 500 (charge, discharge cycles). Using this device, the movement in blood vessels due to pulsatile blood flow synchronous to the cardiac cycle was measured in a human participant. Moreover Pulse Transit Time (PTT) measurements for continuous blood pressure were performed in a cardiovascular phantom.
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