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  1. Article ; Online: Investigating the inaccuracies of indirect method of blood pressure measurement associated to the cuff constructing fabrics

    Shenela Naqvi / Muhammad Dawood Husain / Philip Lewis

    Mehran University Research Journal of Engineering and Technology, Vol 41, Iss 2, Pp 127-

    2022  Volume 134

    Abstract: Numerous cuffs have been manufactured using different materials in which textile fabric is the main constituent. There are no specific guidelines for the selection of the cuff fabric and its design. In this investigation, five different types of cuffs ( ... ...

    Abstract Numerous cuffs have been manufactured using different materials in which textile fabric is the main constituent. There are no specific guidelines for the selection of the cuff fabric and its design. In this investigation, five different types of cuffs (made of woven and non-woven fabrics) were selected, and their pressure distribution was noted while mimicking the process of blood pressure measurement. It was achieved by measuring pressure at the interface of the selected cuffs and a bare metal cylinder. I-scan, an interface pressure measurement system was employed to record the interface pressure profiles under the cuffs against 140 mmHg to 40 mmHg pressure inside the cuffs. The data obtained from the pressure sensing system was processed in MATLAB to examine pressure distribution at 96 points in detail. The results show that the cuffs registered non-uniform pressure distribution at the interface which is also non-identical among the selected cuffs. The pressure at the interface is found to be lower than the pressure inside the cuff, which shows that pressure attenuates as transfers to the surface of the object underneath it. The range of the pressure difference varies from 10 mmHg to 15 mmHg. This study indicates that the pressure distribution under a cuff depends on the constructing fabric and its properties. It is concluded that there is a need to select appropriate fabric with optimized properties for desired pressure distribution which may lead to accurate estimation of blood pressure.
    Keywords Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Science ; Q
    Subject code 660
    Language English
    Publishing date 2022-04-01T00:00:00Z
    Publisher Mehran University of Engineering and Technology
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Steady State Mathematical Model of Test-Rig for the Validation of Experimental Temperature-Resistance Relationship of Temperature Sensing Fabric

    Muhammad Dawood Husain / Shenela Naqvi / Muhammad Owais Raza Siddiqui / Richard Kennon

    Mehran University Research Journal of Engineering and Technology, Vol 41, Iss 1, Pp 23-

    2022  Volume 32

    Abstract: Continuous measurement of temperature profiles on the human body surface provides handy information for the diagnosis and as a beneficial guide to take appropriate action. A textile based Resistance Temperature Detector (RTD) has been reported recently, ... ...

    Abstract Continuous measurement of temperature profiles on the human body surface provides handy information for the diagnosis and as a beneficial guide to take appropriate action. A textile based Resistance Temperature Detector (RTD) has been reported recently, which could be exploited to monitor the temperature of human body over extended period of time. For the purpose of calibrating these textile based sensor, a tailor-made test rig has been developed. The working principle of this sensing fabric is the same as the RTD i.e. change in resistance because of change in temperature. Validation of experimental results by modelling was one of the prime objectives of this study. This paper reports the steady state mathematical model of the test rig components, by the application of fundamental heat transfer principles. It was concluded that the temperature varies linearly across the thickness of textile based temperature sensor in a rig setting while the temperature of the sensing element of textile based temperature sensor could be approximated by knowing its exact position within the fibrous structure. This input would be helpful for the calibration purpose of the sensor samples in an improved manner and to circumvent the individual testing and repetition of experiments on a test rig.
    Keywords Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Science ; Q
    Subject code 621
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher Mehran University of Engineering and Technology
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Preliminary Investigations into the Development of Textile Based Temperature Sensor for Healthcare Applications

    Richard Kennon / Muhammad Dawood Husain

    Fibers, Vol 1, Iss 1, Pp 2-

    2013  Volume 10

    Abstract: Human body temperature is an important sign of physical condition in terms of comfort, heat or cold stresses, and of performance. This paper presents the preliminary investigation into the design, manufacturing and testing of the textile based ... ...

    Abstract Human body temperature is an important sign of physical condition in terms of comfort, heat or cold stresses, and of performance. This paper presents the preliminary investigation into the design, manufacturing and testing of the textile based temperature sensor. This sensing fabric may be employed to measure the temperature of the human body on a continuous basis over extensive periods of time, outside the clinical environment. The sensing fabric was manufactured on an industrial scale flat-bed knitting machine by laying-in the sensing element (in the form of fine metal wire) into the double layer knitted structure. The operational principle of the sensing fabric is based on the inherent tendency of metal wire to change in its electrical resistance because of the change in its temperature. An experimental resistance-temperature relationship showed promising validation in comparison with their modeled counterparts.
    Keywords temperature sensor ; conductive textiles ; industrial knitting machine ; temperature-resistance ; resistance thermometers ; human body temperature ; Chemicals: Manufacture ; use ; etc ; TP200-248 ; Textile bleaching ; dyeing ; printing ; TP890-933 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999
    Subject code 670 ; 600
    Language English
    Publishing date 2013-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Uncertainty Analysis of the Temperature–Resistance Relationship of Temperature Sensing Fabric

    Muhammad Dawood Husain / Ozgur Atalay / Asli Atalay / Richard Kennon

    Fibers, Vol 4, Iss 4, p

    2016  Volume 29

    Abstract: This paper reports the uncertainty analysis of the temperature–resistance (TR) data of the newly developed temperature sensing fabric (TSF), which is a double-layer knitted structure fabricated on an electronic flat-bed knitting machine, made of ... ...

    Abstract This paper reports the uncertainty analysis of the temperature–resistance (TR) data of the newly developed temperature sensing fabric (TSF), which is a double-layer knitted structure fabricated on an electronic flat-bed knitting machine, made of polyester as a basal yarn, and embedded with fine metallic wire as sensing element. The measurement principle of the TSF is identical to temperature resistance detector (RTD); that is, change in resistance due to change in temperature. The regression uncertainty (uncertainty within repeats) and repeatability uncertainty (uncertainty among repeats) were estimated by analysing more than 300 TR experimental repeats of 50 TSF samples. The experiments were performed under dynamic heating and cooling environments on a purpose-built test rig within the temperature range of 20–50 °C. The continuous experimental data was recorded through LabVIEW-based graphical user interface. The result showed that temperature and resistance values were not only repeatable but reproducible, with only minor variations. The regression uncertainty was found to be less than ±0.3 °C; the TSF sample made of Ni and W wires showed regression uncertainty of <±0.13 °C in comparison to Cu-based TSF samples (>±0.18 °C). The cooling TR data showed considerably reduced values (±0.07 °C) of uncertainty in comparison with the heating TR data (±0.24 °C). The repeatability uncertainty was found to be less than ±0.5 °C. By increasing the number of samples and repeats, the uncertainties may be reduced further. The TSF could be used for continuous measurement of the temperature profile on the surface of the human body.
    Keywords regression uncertainty ; repeatability uncertainty ; temperature–resistance (TR) relations ; temperature sensing fabric (TSF) ; Chemicals: Manufacture ; use ; etc ; TP200-248 ; Textile bleaching ; dyeing ; printing ; TP890-933 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999
    Language English
    Publishing date 2016-11-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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  5. Article ; Online: Textile-Based Weft Knitted Strain Sensors

    William Richard Kennon / Ozgur Atalay / Muhammad Dawood Husain

    Sensors, Vol 13, Iss 8, Pp 11114-

    Effect of Fabric Parameters on Sensor Properties

    2013  Volume 11127

    Abstract: The design and development of textile-based strain sensors has been a focus of research and many investigators have studied this subject. This paper presents a new textile-based strain sensor design and shows the effect of base fabric parameters on its ... ...

    Abstract The design and development of textile-based strain sensors has been a focus of research and many investigators have studied this subject. This paper presents a new textile-based strain sensor design and shows the effect of base fabric parameters on its sensing properties. Sensing fabric could be used to measure articulations of the human body in the real environment. The strain sensing fabric was produced by using electronic flat-bed knitting technology; the base fabric was produced with elastomeric yarns in an interlock arrangement and a conductive yarn was embedded in this substrate to create a series of single loop structures. Experimental results show that there is a strong relationship between base fabric parameters and sensor properties.
    Keywords strain sensor ; yarn input tension ; elastomeric yarn ; conductive yarn ; contact pressure ; contact area ; conductive textiles ; Technology (General) ; T1-995 ; Technology ; T ; DOAJ:Technology (General) ; DOAJ:Technology and Engineering ; Analytical chemistry ; QD71-142 ; Chemistry ; QD1-999 ; Science ; Q ; DOAJ:Analytical Chemistry ; DOAJ:Chemistry
    Language English
    Publishing date 2013-08-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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