Smart textile sensing system for human respiration monitoring based on fiber Bragg grating

Abstract

Magnetic resonance imaging (MRI) has become an indispensable aid to diagnosis and treatment. As the doctor cannot accompany the patient, it is essential that the patient be monitored remotely to avoid the risk of respiration being impaired by anesthetic drugs or upper airway obstruction. A smart wearable textile sensing system is described in this paper. A fiber Bragg grating (FBG) with polymer encapsulation has been woven into an elastic bandage to detect the respiration motion. According to the strain principle of FBG, the breathing rate and intensity can be obtained by measuring the variety of FBG reflected wavelength. In order to eliminate the temperature cross-sensitivity, a FBG temperature sensor has also been woven into the bandage to achieve the temperature compensation computing. Based on the tunable Fabry-Perot filter wavelength demodulated theory, wavelength measuring method and data processing arithmetic have been presented, and the system with ARM microprocessor has been designed to process and display the breathing information. The experiments to the system have proved that the wavelength measuring range is about 40nm, the resolution of wavelength can arrive at 2pm, and the sampling rate is 5Hz.

Fiber Bragg grating-based sensor for monitoring respiration and heart activity during magnetic resonance imaging examinations

“…36, though the paper concentrates mainly on the signal processing and does not deliver quantitative data on the sensor performance, and in Ref. 37 where the authors verified the influence of the sensor over the quality of imaging, but did not provide sufficient respiratory data.…”

“…Similar techniques for breath detection have been demonstrated by other groups, but their sensors are embedded into special textile belts or vests to be fixed to the monitored person's body. [27][28][29][30][31][32][33][34][35][36][37][38][39] The sensor proposed in this paper is configured for measurements that do not require any special wearable textiles, thereby avoiding the need to carry out processes for preparing the patient for monitoring. The solution closest to the proposed sensor is one comprising a 12-element FBG array embedded into a bed, 40 although only laboratory trials evaluating the RR detection have been carried out so far.…”

Preliminary Assessment of a Flexible Multi-Sensor Wearable System Based on Fiber Bragg Gratings for Respiratory Monitoring of Hemiplegic Patients

“…embedding various sensing technologies have gained even more popularity as they permit unobtrusive and continuous monitoring, ensuring no weight, bulkiness, or motion limitation for the user. These systems are typically equipped with strain sensors (e.g., resistive [ 18 , 19 , 20 , 21 ], capacitive [ 22 , 23 ], inductive [ 24 , 25 ], or fiber Bragg grating (FBG) sensors [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]), allowing respiratory monitoring via the detection of breathing-related chest wall deformations [ 34 ].…”

Fiber-optic sensors for monitoring patient physiological parameters: a review of applicable technologies and relevance to use during magnetic resonance imaging procedures

“…In both cases, FBGs can be embedded in the clothing worn by the patient during monitoring [97][98][99][100][101][102][103][104][105][106][115][116][117][118][119][120][121][122] or mounted in the bed on which the person lies, as shown in Fig. 19.…”

“…The literature provides a number of descriptions in which a single FBG [115][116][117][118] or multiple FBGs [97][98][99][100][101][102][103][104][105][106]114,[119][120][121][122][123] act as the main sensing elements for acquiring body movements caused by respiratory and/or heart function. In both cases, FBGs can be embedded in the clothing worn by the patient during monitoring [97][98][99][100][101][102][103][104][105][106][115][116][117][118][119][120][121][122] or mounted in the bed on which the person lies, as shown in Fig.…”