A Multi-Frequency Focused Impedance Measurement System Based on Analogue Synchronous Peak Detection

Kadir, Muhammad Abdul; Wilson, Adrian; Rabbani, K Siddique-e

doi:10.3389/felec.2021.791016

Cited by 3 publications

(2 citation statements)

References 58 publications

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“…Therefore, the square In conventional electrical impedance measurements, a bipolar configuration is used the potential is developed across two terminals in a network due to a specific driven current. However, this technique is not suitable for bioimpedance measurements as tissue-electrode contact impedances are included in the measurement [29]. Therefore, the tetrapolar impedance measurement (TPIM) technique is adopted where separate pairs of electrodes are used for current drive and potential measurement.…”

Section: System Designmentioning

confidence: 99%

Multi-Modal Portable Respiratory Rate Monitoring Device for Childhood Pneumonia Detection

et al. 2023

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Accurate assessment of Respiratory Rate (RR) is the most important mechanism in detecting pneumonia in low-resource settings. Pneumonia is a disease with one of the highest mortality rates among young children under five. However, the diagnosis of pneumonia for infants remains challenging, especially in low- and middle-income countries (LMIC). In such situations, RR is most often measured manually with visual inspection. Accurate RR measurement requires the child to remain calm without any stress for a few minutes. The difficulty in achieving this with a sick child in a clinical environment can result in errors and misdiagnosis, even more so when the child is crying and non-cooperating around unfamiliar adults. Therefore, we propose an automated novel RR monitoring device built with textile glove and dry electrodes which can make use of the relaxed posture when the child is resting on the carer’s lap. This portable system is non-invasive and made with affordable instrumentation integrated on customized textile glove. The glove has multi-modal automated RR detection mechanism that simultaneously uses bio-impedance and accelerometer data. This novel textile glove with dry electrodes can easily be worn by a parent/carer and is washable. The real-time display on a mobile app shows the raw data and the RR value, allowing a healthcare professional to monitor the results from afar. The prototype device has been tested on 10 volunteers with age variation of 3 years to 33 years, including male and female. The maximum variation of measured RR with the proposed system is ±2 compared to the traditional manual counting method. It does not create any discomfort for either the child or the carer and can be used up to 60 to 70 sessions/day before recharging.

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Section: System Designmentioning

confidence: 99%

Multi-Modal Portable Respiratory Rate Monitoring Device for Childhood Pneumonia Detection

et al. 2023

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“…The proposed measurement system exploits the multi-frequency impedance measurement (MFIM) method widely used in biomeasurements, spectroscopy, and impedance tomography [ 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. MFIM has also been used to detect and size DNA fragments [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Load Estimation of Moving Passenger Cars Using Inductive-Loop Technology

Marszałek

Duda

Piwowar

et al. 2023

Sensors

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Due to their lack of driving controllability, overweight vehicles are a big threat to road safety. The proposed method for a moving passenger car load estimation is capable of detecting an overweight vehicle, and thus it finds its application in road safety improvement. The weight of a car’s load entering or leaving a considered zone, e.g., industrial facility, a state, etc., is also of concern in many applications, e.g., surveillance. Dedicated vehicle weight-in-motion measurement systems generally use expensive load sensors that also require deep intervention in the road while being installed and also are calibrated only for heavy trucks. In this paper, a vehicle magnetic profile (VMP) is used for defining a load parameter proportional to the passenger vehicle load. The usefulness of the proposed load parameter is experimentally demonstrated in field tests. The sensitivity of the VMP to the load change results from the fact that the higher load decreases the vehicle clearance value which in turn increases the VMP. It is also shown that a slim inductive-loop sensors allows the building of a load estimation system, with a maximum error around 30 kg, which allows approximate determination of the number of passengers in the car. The presented proof of concept extends the functionality of inductive loops, already installed in the road, for acquiring other traffic parameters, e.g., moving vehicle axle-to-axle distance measurement, to road safety and surveillance related applications.

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Design and Manufacturing of Equipment for Investigation of Low Frequency Bioimpedance

et al. 2022

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The purpose of this study was to highlight a method of making equipment for the investigation of low frequency bioimpedance. A constant current with an average value of I = 100 µA is injected into the human body via means of current injection electrodes, and the biological signal is taken from the electrodes of electric potential charged with the biopotentials generated by the human body. The resulting voltage, ΔU is processed by the electronic conditioning system. The mathematical model of the four-electrode system in contact with the skin, and considering a target organ, was simplified to a single equivalent impedance. The capacitive filter low passes down from the differential input of the first instrumentation amplifier together with the isolated capacitive barrier integrated in the precision isolated secondary amplifier and maintains the biological signal taken from the electrodes charged with the undistorted biopotentials generated by the human body. Mass loops are avoided, and any electric shocks or electrostatic discharges are prevented. In addition, for small amplitudes of the biological signal, electromagnetic interferences of below 100 Hz of the power supply network were eliminated by using an active fourth-order Bessel filtering module. The measurements performed for the low frequency of f = 100 Hz on the volunteers showed for the investigated organs that the bioelectrical resistivities vary from 90 Ωcm up to 450 Ωcm, and that these are in agreement with other published and disseminated results for each body zone.

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A Multi-Frequency Focused Impedance Measurement System Based on Analogue Synchronous Peak Detection

Cited by 3 publications

References 58 publications

Multi-Modal Portable Respiratory Rate Monitoring Device for Childhood Pneumonia Detection

Multi-Modal Portable Respiratory Rate Monitoring Device for Childhood Pneumonia Detection

Load Estimation of Moving Passenger Cars Using Inductive-Loop Technology

Design and Manufacturing of Equipment for Investigation of Low Frequency Bioimpedance

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