IEEE Sensors Journal

A novel molecularly imprinted fluorescent sensor (MIFS) based on glutathione-modified CdTe quantum dots (QDs) was fabricated to detect and determine difenoconazole (DFZ) in agricultural products. Initially, glutathione-modified CdTe QDs were synthesized via the refluxing method. The MIFS was then synthesized by fixing a molecularly imprinted polymer layer on the surface of QDs through a sol–gel pr... View full abstract»

This paper reports a humidity detection system of quartz crystal microbalance (QCM) sensor based on layer-by-layer self-assembled poly (dimethyl diallyl ammonium chloride) (PDDAC) and graphene oxide (GO) nanocomposite film. The microstructures of the PDDAC/GO film were characterized by X-ray diffraction, Fourier transform infrared spectrum and scanning electron microscopy. The hydrophilic property... View full abstract»

Carbon modified titanium dioxide nanostructured (CMTN) was successfully fabricated by ethanol carbonization method and applied to modify the surface of glassy carbon electrode. This modified electrode was employed in the extraction and the electrochemical determination of methylene blue. The considerable increment in the voltammetric signal for pre-adsorbed methylene blue compared with those for s... View full abstract»

Acetone vapor sensing is important for environmental monitoring and non-invasive screening of diabetes mellitus (DM). Inhaling higher than 176 parts per million (ppm) acetone concentrations affects the respiratory system, while acetone in exhaled breath correlates with blood glucose and exhaling more than 1.8 ppm indicates the person is in danger of DM. DM is currently diagnosed invasively by meas... View full abstract»

The conventional LVDT is generally used as displacement transducer but has some limitations such as small linear range, measurement errors due to stray capacitance effect, electromagnetic interference effect, and core loss effect. In this paper, a modified LVDT type displacement transducer has been proposed in order to overcome these limitations of conventional LVDT. The proposed LVDT will consist... View full abstract»

The objective of this study is to validate distributed strain sensing using electrical time domain reflectometry (ETDR) with multi-walled carbon nanotube (MWCNT)-based thin film sensing elements. The proposed ETDR sensor composed of two types of transmission lines: parallel-wire-type transmission line and parallel-plate-type transmission line, (i.e., with MWCNT-based sensing eleme... View full abstract»

This paper introduces a measurement method for the railgun current and the armature’s speed and initial position for electromagnetic launch systems. The measurement device consists of several parts: a current B-dot probe, several speed B-dot probes, the data acquisition system, and a computer. A calibration experiment was done by comparing with another commercial Rogowski coil. The measured instan... View full abstract»

This paper deals with design and fabrication of graphene micro-Hall devices along with driving and processing electronics to construct a highly sensitive graphene magnetometer system. Graphene micro-Hall elements were fabricated by implementing microfabrication techniques. Custom driving and processing circuitry was designed and built on a printed circuit board and integrated with fabricated graph... View full abstract»

A zinc oxide quantum dot (ZnO QD) texturing layer was printed on a SiO2surface to resolve the issue of ink drop aggregation during inkjet printing tungsten oxide precursor (WO3Pr) ink, made from ultrasonicating ammonium metatungstate [(NH3)6H2W12O40]in a mixture of Dimethylformamide and water, for high-performance ultravi... View full abstract»

We propose a new readout paradigm for enhancing the performance of wireless resistive and reactive sensors. Here, we consider a passive resistor–inductor–capacitor sensor that is inductively coupled to an active reader, with the equivalent circuit of the whole telemetry system obeying the space-time reflection symmetry or the parity–time (PT) symmetry. As inspired by PT-symmetric quantum systems, ... View full abstract»

In this paper, an efficient and compact inline interferometric fiber sensor array based on Fiber Bragg Grating (FBG) and rectangular-pulse binary phase modulation is proposed. FBGs are made inline on the fiber to act as the reflection mirrors to construct the interferometer working as the sensing area. Polarizer-based polarization diversity receiver method is used to overcome the polarization-indu... View full abstract»

An in-fiber Bragg grating (FBG) sensor for refractive index (RI) measurement is proposed and experimentally demonstrated by using an optoelectronic oscillator (OEO). The index sensor device is an etched phase-shifted fiber Bragg grating (PS-FBG) with a radius of$27.5~\mu \text{m}$. In the OEO loop, the PS-FBG is exposed to diff... View full abstract»

A reflection-type liquid-level sensor based on mechanically induced long-period fiber grating (MLPFG) is proposed and experimentally demonstrated. The sensor, acting as a Michelson interferometer, includes MLPFG with double-cladding fiber (DCF) whose end-face is coated with a silver film. DCF is used here in order to be more conducive for interference-spectrum generation. The liquid level can be m... View full abstract»

A novel concept of acoustic fiber Bragg grating (AFBG) was conceived and experimentally validated as an effective technique for high-temperature sensing. Similar to the well-known optical fiber Bragg grating, the AFBG employs interactions between waves and periodic structures on an elongated waveguide. Acoustic waves reflected from periodic structures interfere with each other and result in the em... View full abstract»

In this paper, a nonlinear Gaussian filter is designed for nonlinear stochastic uncertain system with correlated noises. Because the networked systems with random delays and packet losses can be transformed into those with correlated multiplicative noises in the state and measurement matrices, we consider the stochastic uncertain system with synchronously correlated multiplicative noises. The proc... View full abstract»

Resolution of HEMT sensors needs to be improved to make feasible the precise detection of antigens from body fluids like saliva instead of blood. For enhancing sensitivity and long-term stability, a systematical study of the device becomes mandatory which is impossible without the aid of an analytical model. Presented through this work is a mathematical model developed for high frequency AlGaN/AlN... View full abstract»

In this paper, we report on the utility of pocket tunnel field-effect transistors (TFETs) for use as dielectric-modulated biosensor. It is shown that incorporation of a pocket doping in the source facilitates lateral as well as vertical tunneling, which allows biomolecules located at various positions within the cavity to cause a detectable shift in current–voltage characteristics. Considering rea... View full abstract»

Distributed position and orientation system (POS) uses transfer alignment to accurately measure multi-node time-spatial reference information, which is urgently demanded to compensate motion error of imaging sensors for aerial survey. The lever-arm deformation in transfer alignment will result in nonlinear error and time-varying measurement noise covariance, which decreases the accuracy of real-ti... View full abstract»

For the sake of structural health monitoring for defect detection in thin-wall structures, we present an outlier analysis approach by using robust principal component analysis (Robust PCA) for the Lamb wave signals generated by a transducer network. The signal matrix is decomposed into a low-rank matrix and a sparse matrix that contains outliers. By presenting a rank approximation function that ma... View full abstract»

The ever-increasing demand for biometric solutions for the Internet-of-Things (IoT)-based connected health applications is mainly driven by the need to tackle fraud issues, along with the imperative to improve patient privacy, safety, and personalized medical assistance. However, the advantages offered by the IoT platforms come with the burden of big data and its associated challenges in terms of ... View full abstract»

Pose tracking based on a permanent magnet is not limited by line of sight. In general, a high-remanence and axially magnetized cylindrical permanent magnet is utilized as the magnetic source, which is regarded as a magnetic dipole model. However, this magnetic tracking approach cannot estimate the rotation information along the direction of the magnetic moment. Thus, only 3-D linear motion and 2-D... View full abstract»

Electrical capacitance tomography (ECT) is a non-invasive and non-intrusive imaging modality that utilizes mutual capacitance measurements between electrode plates to reconstruct the cross-sectional spatial electrical permittivity distribution inside a region of interest (RoI). Increasing attention has been given in recent years to the extension of ECT to volumetric imaging, also known as electric... View full abstract»