A Real-Time Wireless Calorimetric Flow Sensor System with a Wide Linear Range for Low-Cost Respiratory Monitoring

In this paper, a real-time wireless respiratory monitoring system using a dual pair of detectors-based thermal flow (D2TF) sensor with a wide linear range is reported. The D2TF sensor structure and packaging are optimized to achieve a linear range of -70 SLM ∼ 70 SLM (-4 m/s ∼ 4 m/s) and a sensitivity of 9.18 mV/SLM. Moreover, the developed wireless sensor system shows a system response time of less than 23 ms with a data sample rate of 2 kHz, which can capture sharp signal changes in respiration. Therefore, the proposed respiratory monitoring system can significantly reduce the complexity of calibration and simplify signal processing, which is promising for low-cost intelligent medical care applications. © 2023 IEEE.