An air flow sensor for neonatal mechanical ventilation applications based on a novel fiber-optic sensing technique

Battista, L.; Sciuto, S. A.; Scorza, A.
March 2013
Review of Scientific Instruments;Mar2013, Vol. 84 Issue 3, p035005
Academic Journal
In this work, a simple and low-cost air flow sensor, based on a novel fiber-optic sensing technique has been developed for monitoring air flows rates supplied by a neonatal ventilator to support infants in intensive care units. The device is based on a fiber optic sensing technique allowing (a) the immunity to light intensity variations independent by measurand and (b) the reduction of typical shortcomings affecting all biomedical fields (electromagnetic interference and patient electrical safety). The sensing principle is based on the measurement of transversal displacement of an emitting fiber-optic cantilever due to action of air flow acting on it; the fiber tip displacement is measured by means of a photodiode linear array, placed in front of the entrance face of the emitting optical fiber in order to detect its light intensity profile. As the measurement system is based on a detection of the illumination pattern, and not on an intensity modulation technique, it results less sensitive to light intensity fluctuation independent by measurand than intensity-based sensors. The considered technique is here adopted in order to develop two different configurations for an air flow sensor suitable for the measurement of air flow rates typically occurring during mechanical ventilation of newborns: a mono-directional and a bi-directional transducer have been proposed. A mathematical model for the air flow sensor is here proposed and a static calibration of two different arrangements has been performed: a measurement range up to 3.00 × 10-4 m3/s (18.0 l/min) for the mono-directional sensor and a measurement range of ±3.00 × 10-4 m3/s (±18.0 l/min) for the bi-directional sensor are experimentally evaluated, according to the air flow rates normally encountered during tidal breathing of infants with a mass lower than 10 kg. Experimental data of static calibration result in accordance with the proposed theoretical model: for the mono-directional configuration, the coefficient of determination r2 is equal to 0.997; for the bi-directional configuration, the coefficient of determination r2 is equal to 0.990 for positive flows (inspiration) and 0.988 for negative flows (expiration). Measurement uncertainty δQ of air flow rate has been evaluated by means of the propagation of distributions and the percentage error in the arrangement of bi-directional sensor ranges from a minimum of about 0.5% at -18.0 l/min to a maximum of about 9% at -12.0 l/min.


Related Articles

  • Balance of Polarization in a Hybrid Fiber Optic Sensor. ŻYCZKOWSKI, M.; SZUSTAKOWSKI, M.; MARKOWSKI, P.; KAROL, M. // Acta Physica Polonica, A.;Sep2013, Vol. 124 Issue 3, p610 

    This paper presents the effect of light polarization in a hybrid fiber optic sensor. The hybrid sensor is defined as a combination of interferometer sensor and modalmetric sensor. Hybrid sensor system is based on the effect of outputting interferometric sensor of interference as a result of...

  • Fiber-optic temperature sensor based on interference of selective higher-order modes. Li, Enbang; Wang, Xiaolin; Zhang, Chao // Applied Physics Letters;8/28/2006, Vol. 89 Issue 9, p091119 

    A fiber-optic temperature sensor based on the interference of selective higher-order modes in circular optical fibers is described. The authors demonstrate that by coupling the LP01 mode in a standard single-mode fiber to the LP0m modes in a multimode fiber, and utilizing the interference of the...

  • Numerical Optimization of Structures SAW Gas Sensors. HEJCZYK, T.; URBAŃCZYK, M. // Acta Physica Polonica, A.;Sep2013, Vol. 124 Issue 3, p432 

    This paper presents the results of the analysis of surface acoustic waves sensor equivalent model. They were the sensor response of the surface acoustic waves sensor in the steady state gas: H2, CO2, NO2, NH3, CnHm, CO. Thin layer of WO3 has been used as a sensor layer. Impedance replacement of...

  • Control of the Temperature in the Fluid Flow by Semiconductor Sensors. Dumćius, A.; Augutis, V.; Gailius, D. // Electronics & Electrical Engineering;2008, Issue 87, p27 

    Application possibilities of the semiconductor temperature sensors for measurement of the temperature in the fluid flow are analyzed. Possible causes for scattering of the sensor parameters during manufacture were investigated. It was shown, that by additional calibration of the analog...

  • Novel fiber-optic torsional vibrometers. Liu, T. Y.; Berwick, M.; Jackson, D. A. // Review of Scientific Instruments;Apr92, Vol. 63 Issue 4, p2164 

    Two configurations for a fiber-optic torsional vibrometer are described, which can be classified as (i) differential and (ii) reference. Common features of both techniques are noncontact measurement, immunity to nontorsional vibration, large dynamic range coupled with passive, miniature, remote...

  • Characterization of a simple, high Reynolds number droplet generator for combustion studies. Peterson, Richard B. // Review of Scientific Instruments;Jun88, Vol. 59 Issue 6, p960 

    A new technique is described for generating droplets in the size range between 240 and 750 μm. The droplets are characterized by Reynolds numbers (in air at standard conditions) greater than 100, hence, with a liquid fuel as the droplet fluid, this technique has applicability in studies of...

  • Flow diagnostics using fibre optics. Vasudevan, B.; Padbidri, Srikanth; Kishore, M. Chandra // Sadhana;Feb/Apr2007, Vol. 32 Issue 1/2, p7 

    Research in the area of flow diagnostics using fibre-optics started in our laboratory in early 1998. The first-ever multi-component wind tunnel balance in the world, working with fibre-optic sensors was built and demonstrated in 1999. Since then, several new applications of the technique in the...

  • Differential dielectric-to-density measurement for cryogenic fluids. Liu, F. F.; Chow, S. W. H. // Review of Scientific Instruments;Oct87, Vol. 58 Issue 10, p1917 

    A high-speed microprocessor-based cryogenic fluid density instrumentation is developed based on the rigorous application of dielectric theory, using a dielectric susceptibility function in the application of molecular Clausius–Mossotti formula. The operating principle is formulated on a...

  • A distributed fiber-optic position-sensitive detector of an electric arc. Kazachkov, Yu. P. // Instruments & Experimental Techniques;Mar2009, Vol. 52 Issue 2, p287 

    A distributed fiber-optic position-sensitive detector for detecting an electric arc by optical radiation at an illuminance of ∼105 lx, a fiber length of 25 m, and an arc location error of 1 m is described.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics