Improved fibre optic respiratory monitoring using a figure-of-eight coil

School of Life Sciences, Kingston University, Surrey, UK.
Physiological Measurement (Impact Factor: 1.81). 11/2005; 26(5):585-90. DOI: 10.1088/0967-3334/26/5/001
Source: PubMed


The macro-bending loss effect in optical fibres has been used to redevelop a sensor for the measurement of thoracic and abdominal circumferences in non-invasive respiratory monitoring. The new sensor uses a novel figure-of-eight loop configuration, which results in increased linearity of response, less mechanical resistance and hysteresis, as well as other benefits. The performance of the new sensor as applied to respiratory monitoring is examined, and indicates a higher resolution and sensitivity than the old. This enhanced performance enables measurement of respiratory and cardiac function using the same transducing fibre.

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Available from: Julian Mason, Jul 16, 2014
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    • "Similar principles have been reported and a summary presented in [19]. Augousti et al. proposed a respiratory analysis by means of macro bending loss effects [21,22]. Although most of the published work dealing with textile-based breathing monitoring systems show satisfactory sensing capabilities, their use in a medical environment is still limited by the poor usability of the sensors for the medical staff and the patient [19]. "
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    ABSTRACT: In this paper, a textile-based respiratory sensing system is presented. Highly flexible polymeric optical fibres (POFs) that react to applied pressure were integrated into a carrier fabric to form a wearable sensing system. After the evaluation of different optical fibres, different setups were compared. To demonstrate the feasibility of such a wearable sensor, the setup featuring the best performance was placed on the human torso, and thus it was possible to measure the respiratory rate. Furthermore, we show that such a wearable system enables to keep track of the way of breathing (diaphragmatic, upper costal and mixed) when the sensor is placed at different positions of the torso. A comparison of the results with the output of some commercial respiratory measurements devices confirmed the utility of such a monitoring device.
    Sensors 07/2014; 14(7):13088-13101. DOI:10.3390/s140713088 · 2.25 Impact Factor
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    • "Although this last approach presents some fragility worries, optical fiber sensors are one of the sensor technologies with most potential, when seeking performance and long-term stability [10]. They have proved their performance in a set of applications such as the aeronautics [11] or civil [12], but also in physiological measurements [13]–[15]. The proposition explored in this paper is to achieve a sensing glove simpler than the previous competitors without neglecting its performance, via optical fiber sensors. "
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    ABSTRACT: A wearable sensing glove for monitoring hand gestures and posture has been developed. The glove sensing capability is based on optical fiber Bragg gratings (FBGs) sensors. These sensors, due to their inherent self-referencing and multiplexing capability, are a value-added choice for this application. A single optical fiber would cross all the hand with Bragg structures in specific spots, as the finger joints. The functionality and performance of the glove was fully evaluated. The sensor response was linear to the hand movements for opening and closing down. Through the sensor response, it was possible to retrieve information about the joint angles from which other set of information like finger force can be estimated. The developed glove was able to provide numerical data about the angles of the hand posture in real time. The simplicity of the system and performance makes it well suitable for physical therapy applications, study of the human kinematics during sport activity, virtual reality or even remote control applications, among others.
    IEEE Sensors Journal 11/2011; 11(10-11):2442 - 2448. DOI:10.1109/JSEN.2011.2138132 · 1.76 Impact Factor
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    • "The main contribution of this paper is the development of a sensing solution able to measure the cardio-pulmonary components with a single sensor and entirely compatible with healthcare environments. The proposed solution uses fiber Bragg grating (FBG) sensors to monitor both the respiratory and cardiac frequencies, rather than using the macro-bending loss effect of a single optical fiber (of other type) [7] [8]. Although Gurkan et al [9] had developed a FBG-based solution, it was based on an approach that enabled only the heartbeat measurement. "
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    ABSTRACT: A respiratory and cardiac-frequency sensor has been designed and manufactured to monitor both components with a single fiber Bragg grating (FBG) sensor. The main innovation of the explored system is the structure in which the FBG sensor is embedded. A specially developed polymeric foil allowed the simultaneous detection of heart rate and respiration cycles. The PVC has been designed to enhance the sensor sensitivity. In order to retrieve both components individually, a signal processing system was implemented for filtering out the respiratory and cardiac frequencies. The developed solution was tested along with a commercial device for referencing, from which the proposed system reliability is concluded. This optical-fiber system type has found an application niche in magnetic resonance imaging (MRI) exam rooms, where no other types of sensors than optical ones are advised to enter due to the electromagnetic interference.
    Measurement Science and Technology 07/2011; 22(22):75801-75801. DOI:10.1088/0957-0233/22/7/075801 · 1.43 Impact Factor
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