DP flow sensor using optical fibre Bragg grating

Lim, Jirapong; Yang, Qingping; Jones, Barry E.; Jackson, P.R.

doi:10.1016/s0924-4247(01)00546-5

Cited by 69 publications

(26 citation statements)

References 7 publications

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“…According to equation (4) to (7), the relation between the flow velocity and the pressure difference can be deduced as shown in the following expression (8). …”

Section: Sensor Structure and Principlementioning

confidence: 99%

A liquid DP flow sensor on straight pipe

Zhang

Liu

Xiao

et al. 2010

2010 the 2nd International Conference on Industrial Mechatronics and Automation

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To detect water and pesticide flow rate for variable-rate spray, a new type liquid Differential Pressure (DP) flow sensor was introduced in this paper. The main problem that we attempt to solve was on-line flow measurement, to know the flow each moment and adjust pesticide to a desirable flow in the spray system. This new DP flow sensor is composed of a straight pipe with two branch pipes (an upstream branch pipe and a downstream branch pipe) in two ends and a DP sensor. A pressure difference between the upstream branch pipe and the downstream pipe is detected and converted into a voltage signal by the DP sensor.This voltage signal is transmitted to a microprocessor to determine liquid flow rate. Using water as working fluid, the liquid DP flow sensor at a certain dimension has been tested at the temperature of 22.0"C. The experimental results have shown that the presented device is satisfactory to variable sprayer with the measurement errors less than 1 %. This liquid DP flow sensor's advantage is simple in structure.

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“…According to equation (4) to (7), the relation between the flow velocity and the pressure difference can be deduced as shown in the following expression (8). …”

Section: Sensor Structure and Principlementioning

confidence: 99%

A liquid DP flow sensor on straight pipe

Zhang

Liu

Xiao

et al. 2010

2010 the 2nd International Conference on Industrial Mechatronics and Automation

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“…16 These last mentioned features of the fiber-optic sensors can be useful to manufactures, during design and construction of medical equipments, in order to reduce the effects due to EMI and to improve electrical safety conditions. Despite several optical fiber sensors (OFS) for flow measurement have been recently proposed (e.g., water [17][18][19] and air flow 20 measurements based on the vortex shedding from optical fiber; liquid flowmeters based on fiber Bragg gratings [21][22][23][24] (FBGs), on the Coriolis measuring principle, 25 on intensity modulation of light transmitted through the optical fiber due to bending loss 26,27 and micromachined sensors for low flow measurement 28 ), it is difficult to find an exhaustive investigation dealing with design and testing of optical fiber air flow meters in neonatal ventilation applications. Furthermore, proposed air flowmeters based on FBGs require interrogators or optical spectrum analyzers that are expensive and characterized by a wavelength scanning speed usually quiet limited; 16 however, their measuring technology is not affected by optical power fluctuations.…”

Section: Introductionmentioning

confidence: 99%

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

Battista

Sciuto

Scorza

2013

Review of Scientific Instruments

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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) m(3)∕s (18.0 l∕min) for the mono-directional sensor and a measurement range of ±3.00 × 10(-4) m(3)∕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 r(2) is equal to 0.997; for the bi-directional configuration, the coefficient of determination r(2) 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.

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“…In the last two decades, fiber Bragg gratings (FBGs) are attractive in sensing areas due to their various advantages over traditional electrical sensors, such as electrically free operation, immunity to radio frequency interference (RFI) and electromagnetic interference (EMI), high sensitivity, compact size, self-referencing and multiplexing capabilities. The responses of FBGs to the applied strain have facilitated various transducer designs that can deal with many measurands such as acceleration [3][4][5], displacement [6], pressure [7], force [8], flow [9], ultrasound [10], torsion [11], etc. Several FBG-based tilt sensors for one or two-dimensional (1-D or 2-D) tilt measurements have been reported in recent years [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%