Fibre optic Bragg grating strain sensor used to monitor the respiratory spectrum

Wehrle, Günther; Mignani, A. G.; Lefèvre, H. C.

doi:10.1117/12.2302314

Cited by 5 publications

(6 citation statements)

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“…In the latter application, an FBG is inserted into the viscoelastic shell between vertebrae through a thin hypodermic needle, as shown in Fig. The principle advantage of [103].) A standard strain gauge sensor is simultaneously inserted as a reference to measure the hydrostatic strain as the lumbar column is loaded.…”

Section: Biomedical Sensing: Hydrostatic Pressure Sensing In Medicinementioning

confidence: 99%

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Principles of Optical Fiber Grating Sensors

Kashyap

2010

Fiber Bragg Gratings

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Section: Biomedical Sensing: Hydrostatic Pressure Sensing In Medicinementioning

confidence: 99%

“…In addition, the frequency of the signal can be used to trigger corrective action should the patient be under stress [103]. In this application, an FBG is attached to an elastic belt, which is held in position just above the breast.…”

Section: Respiration Monitoringmentioning

confidence: 99%

Principles of Optical Fiber Grating Sensors

Kashyap

2010

Fiber Bragg Gratings

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“…This grating has a transmission spectrum with linear variation going from 5% to ≈90% across 15 nm on the long wavelength side and a sharper variation along ≈7.5 nm on the other side. Details of the set-up are presented elsewhere [17] but both grating spectra are shown in figure 1. The spectral characteristics of the gratings used guaranteed a dynamic range of nearly 1.5% of stress, which is more than we intended to subject the sensing grating to.…”

Section: Designmentioning

confidence: 99%

A fibre optic Bragg grating strain sensor for monitoring ventilatory movements

Wehrle¹,

Nohama²,

Kalinowski³

et al. 2001

Meas. Sci. Technol.

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A fibre optic Bragg grating sensor to measure the strain in the chest of patients is described. The sensor provides a new method to measure ventilatory movements and it can also determine the respiratory frequency spectrum. The apparatus uses a fixed optical filter reference scheme to reduce the overall cost and is able to detect respiratory movements with frequency components up to 10 Hz. Ventilatory signals were acquired from slow breathing, with 500 ml inspiration volume, to fast, with a reduced volume of 60 ml, respiration. The sensor described here can be used to trigger the pulse burst of electrically assisted ventilation processes or to monitor high frequency oscillatory ventilation.

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“…Currently, fiber-optic sensors are implemented in the measurement and monitoring of various physical variables such as pressure, displacement, temperature, refractive index, strain, etc. [1][2][3][4][5][6][7], with temperature sensors being the most studied and applied in recent years in the field of monitoring processes. Fiber gratings-fiber Bragg gratings (FBGs) [8,9] and long-period fiber gratings (LPGs) [10]-conventional high-birefringence (HiBi) optical fibers [11][12][13][14], waist-enlarged fusion bitaper [15], liquid-sealed tapered fibers [16], filled side-hole fibers [17][18][19][20], and filled photonic crystal fibers (PCFs) [21][22][23][24] have especially attracted great interest in temperature-sensing applications.…”

Section: Introductionmentioning

confidence: 99%

Highly sensitive temperature sensor using a Sagnac loop interferometer based on a side-hole photonic crystal fiber filled with metal

Reyes-Vera¹,

Cordeiro²,

Torres³

2017

Appl. Opt.

113

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A highly sensitive temperature sensor based on an all-fiber Sagnac loop interferometer combined with metal-filled side-hole photonic crystal fiber (PCF) is proposed and demonstrated. PCFs containing two side holes filled with metal offer a structure that can be modified to create a change in the birefringence of the fiber by the expansion of the filler metal. Bismuth and indium were used to examine the effect of filler metal on the temperature sensitivity of the fiber-optic temperature sensor. It was found from measurements that a very high temperature sensitivity of -9.0 nm/°C could be achieved with the indium-filled side-hole PCF. The experimental results are compared to numerical simulations with good agreement. It is shown that the high temperature sensitivity of the sensor is attributed to the fiber microstructure, which has a significant influence on the modulation of the birefringence caused by the expansion of the metal-filled holes.

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Fibre optic Bragg grating strain sensor used to monitor the respiratory spectrum

Cited by 5 publications

References 0 publications

Principles of Optical Fiber Grating Sensors

Principles of Optical Fiber Grating Sensors

A fibre optic Bragg grating strain sensor for monitoring ventilatory movements

Highly sensitive temperature sensor using a Sagnac loop interferometer based on a side-hole photonic crystal fiber filled with metal

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