Micro tapered Mach-Zehnder fiber interferometer for monitoring pressure fluctuation and its applications in pulse rate detection

Hsieh, Yu-Hsin; Chen, Nan‐Kuang

doi:10.1109/icait.2013.6621523

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…Mach–Zehnder interferometers [ 37 ], which are characterized by simpler and cheaper production, were also demonstrated. In addition, they can be made using tapers, as shown in [ 38 ], dealing with pulse detection.…”

Section: State Of the Artmentioning

confidence: 99%

Magnetic Resonance Imaging Compatible Non-Invasive Fibre-Optic Sensors Based on the Bragg Gratings and Interferometers in the Application of Monitoring Heart and Respiration Rate of the Human Body: A Comparative Study

Nedoma

Kepák

Fajkus

et al. 2018

Sensors

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The publication presents a comparative study of two fibre-optic sensors in the application of heart rate (HR) and respiratory rate (RR) monitoring of the human body. After consultation with clinical practitioners, two types of non-invasive measuring and analysis systems based on fibre Bragg grating (FBG) and fibre-optic interferometer (FOI) have been designed and assembled. These systems use probes (both patent pending) that have been encapsulated in the bio-compatible polydimethylsiloxane (PMDS). The main advantage of PDMS is that it is electrically non-conductive and, as well as optical fibres, has low permeability. The initial verification measurement of the system designed was performed on four subjects in a harsh magnetic resonance (MR) environment under the supervision of a senior radiology assistant. A follow-up comparative study was conducted, upon a consent of twenty volunteers, in a laboratory environment with a minimum motion load and discussed with a head doctor of the Radiodiagnostic Institute. The goal of the laboratory study was to perform measurements that would simulate as closely as possible the environment of harsh MR or the environment of long-term health care facilities, hospitals and clinics. Conventional HR and RR measurement systems based on ECG measurements and changes in the thoracic circumference were used as references. The data acquired was compared by the objective Bland–Altman (B–A) method and discussed with practitioners. The results obtained confirmed the functionality of the designed probes, both in the case of RR and HR measurements (for both types of B–A, more than 95% of the values lie within the ±1.96 SD range), while demonstrating higher accuracy of the interferometric probe (in case of the RR determination, 95.66% for the FOI probe and 95.53% for the FBG probe, in case of the HR determination, 96.22% for the FOI probe and 95.23% for the FBG probe).

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Section: State Of the Artmentioning

confidence: 99%

Magnetic Resonance Imaging Compatible Non-Invasive Fibre-Optic Sensors Based on the Bragg Gratings and Interferometers in the Application of Monitoring Heart and Respiration Rate of the Human Body: A Comparative Study

Nedoma

Kepák

Fajkus

et al. 2018

Sensors

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show abstract

“…Mach–Zehnder interferometers [32], which are characterized by simpler and cheaper productions, have also been demonstrated. In addition, they can be made using tapers, as shown in publication [33], which is focused on monitoring the heart rate.…”

Section: State-of-the-artmentioning

confidence: 99%

Vital Sign Monitoring and Cardiac Triggering at 1.5 Tesla: A Practical Solution by an MR-Ballistocardiography Fiber-Optic Sensor

Nedoma

Fajkus

Martínek

et al. 2019

Sensors

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This article presents a solution for continuous monitoring of both respiratory rate (RR) and heart rate (HR) inside Magnetic Resonance Imaging (MRI) environments by a novel ballistocardiography (BCG) fiber-optic sensor. We designed and created a sensor based on the Fiber Bragg Grating (FBG) probe encapsulated inside fiberglass (fiberglass is a composite material made up of glass fiber, fabric, and cured synthetic resin). Due to this, the encapsulation sensor is characterized by very small dimensions (30 × 10 × 0.8 mm) and low weight (2 g). We present original results of real MRI measurements (conventionally most used 1.5 T MR scanner) involving ten volunteers (six men and four women) by performing conventional electrocardiography (ECG) to measure the HR and using a Pneumatic Respiratory Transducer (PRT) for RR monitoring. The acquired sensor data were compared against real measurements using the objective Bland–Altman method, and the functionality of the sensor was validated (95.36% of the sensed values were within the ±1.96 SD range for the RR determination and 95.13% of the values were within the ±1.96 SD range for the HR determination) by this means. The accuracy of this sensor was further characterized by a relative error below 5% (4.64% for RR and 4.87% for HR measurements). The tests carried out in an MRI environment demonstrated that the presence of the FBG sensor in the MRI scanner does not affect the quality of this imaging modality. The results also confirmed the possibility of using the sensor for cardiac triggering at 1.5 T (for synchronization and gating of cardiovascular magnetic resonance) and for cardiac triggering when a Diffusion Weighted Imaging (DWI) is used.

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“…The advantages of optical fiber sensors are outstanding, including high sensitivity, small size and strong anti-electromagnetic interference ability [18]. Some optical fiber sensors have been applied to human health monitoring, including fiber bragg grating (FBG) [19][20][21][22], optical fiber Michelson interferometer [23], Fabry-Perot (FP) interferometer [24][25], Mach-Zehnder interferometer (MZI) [26][27], Sagnac interferometer [28] and intensity modulation fiber [29][30][31], etc. In 2018, Y. Xiao et al, proposed an MZI based optical fiber sensor to achieve simultaneous measurement of urine sugar and microvelocity [32].…”

Section: Introductionmentioning

confidence: 99%

Low-cost wearable device based D-shaped single mode fiber curvature sensor for vital signs monitoring

Liu

et al. 2022

Sensors and Actuators A: Physical

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Micro tapered Mach-Zehnder fiber interferometer for monitoring pressure fluctuation and its applications in pulse rate detection

Cited by 5 publications

References 4 publications

Magnetic Resonance Imaging Compatible Non-Invasive Fibre-Optic Sensors Based on the Bragg Gratings and Interferometers in the Application of Monitoring Heart and Respiration Rate of the Human Body: A Comparative Study

Magnetic Resonance Imaging Compatible Non-Invasive Fibre-Optic Sensors Based on the Bragg Gratings and Interferometers in the Application of Monitoring Heart and Respiration Rate of the Human Body: A Comparative Study

Vital Sign Monitoring and Cardiac Triggering at 1.5 Tesla: A Practical Solution by an MR-Ballistocardiography Fiber-Optic Sensor

Low-cost wearable device based D-shaped single mode fiber curvature sensor for vital signs monitoring

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