IEEE Sensors Journal

This paper presents energy-efficient solutions for wireless sensor systems intended for the monitoring of water quality at water stations. Energy problems, such as energy scarcity and energy consumption in wireless sensor networks, are critical issues that raise concerns when it comes to defining the lifetime of a network. This can be attributed to the finite energy budget of water quality sensor ... View full abstract»

Disposable all solid-state screen printed ion selective electrode was developed for the assay of daclatasvir (DCV) in pharmaceutical formulation and spiked human urine. The sensor is based on daclatasvir-tetraphenyl borate (DCV-TPB) as a sensing element. Incorporation of the multiwall carbon nanotubes (MWCNTs) into the ion selective membrane was found to influence the sensor sensitivity. The MWCNT... View full abstract»

A new label-free aptasensor with high visible-light photoelectrochemical (PEC) activity was fabricated for the detection of AFB1 based on N-doped graphene quantum dots (N-GQDs) sensitized Zn-doped SnS2 (Zn-SnS2) nanocomposites. N-GQDs sensitized Zn-SnS2 showed an eminent PEC performance. Ascorbic acid was utilized as an efficient electron donor for scavenging photo... View full abstract»

We developed a simplified theoretical model for parameters calculation of diode temperature sensors (DTS) based on Schottky diodes (SD). The current flow mechanism of the diodes considered was dominated by over-barrier thermionic emission. Qualitative correlations between basic fundamental and electrophysical parameters of such DTS were established. The expressions for ultimate high-temperature pa... View full abstract»

Pyroelectric infrared (PIR) sensor is widely used as motion detector, due to its sensitivity to the infrared radiation changes (IRC) induced by human motion. In particular, it is also possible to determine the human activity patterns based on the IRC signal by improving the feature-specific sensitivity of the PIR sensors. In this paper, the feature-specific sensitivity is enhanced by visibility mo... View full abstract»

Compressed thin-film gas between the plates produces the squeeze-film damping force that comprises both dissipative and elastic effects. The latter is used in this paper as the mechanism to modify the structural resonance with respect to the change of ambient pressure. Capacitively sensed squeeze-film pressure sensors are implemented in a silicon-based fabrication platform. Nine designs with reson... View full abstract»

A pedestrian dead-reckoning (PDR) system based on micro-inertial technology usually uses a sensor integrated with a three-axis gyroscope, a three-axis accelerometer, and a three-axis magnetometer and is attached to the person’s body (usually on the foot) to acquire the trajectory of the pedestrian. Although a variety of PDR system solutions have been proposed, the PDR solution for marking time and... View full abstract»

Many different coil head configurations are used in electromagnetic induction (EMI) systems for sensing buried targets; however, very little has been published on comparing the configurations. Comparing different coil head designs to one another is cumbersome because many factors determine how well different coil heads perform when constructed and attached to a system. Calculating the voltage rece... View full abstract»

A cost-effective technology to monitor the charging performance and detect the coil misalignment and foreign metal objects is indispensable to the commercialization of wireless power transfer on electric vehicle (EV) charging. This paper presents a multi-purpose tunneling magnetoresistive (TMR) sensor matrix, which can monitor the charging performance as well as detect both the coil misalignment a... View full abstract»

Parallel conductors are found in electrical transmission and distribution systems including large ampacity feeders or loads. However, current unbalance often occurs, especially in alternating current systems. This non-regular current distribution causes overheating and premature aging, facilitating the occurrence of failures. Therefore, a fault diagnosis system is a must, which can be performed by... View full abstract»

This paper proposes a method for automatic inspection of residual stress images based on bending testing for flexible transparent conducting substrates. A flexible characteristics inspection system with single-direction common-path image interferometry is utilized to inspect residual stress images automatically during the bending testing operation. Accordingly, a View full abstract»

The work in this paper is divided into two parts. The first part is going to investigate the potential benefits of clutter suppression in a polarization filtering technology. The performance of a conventional polarization filter is limited by the complex electromagnetic environment. The subcarrier-based polarization filter (SC-PF) enhances the robustness to the environmental disturbance. The exper... View full abstract»

Weather radar networked system (WRNS) is composed of multiple weather radars that transmit a radio signal and receive an echo signal reflected by weather targets. In the current form of WRNS, each radar exploits a different non-orthogonal frequency band, which leads to inefficiency in frequency usage. To tackle this issue, we propose a novel frequency-shared WRNS and investigate its feasibility vi... View full abstract»

The dust generated in industrial processes has a serious impact on the accuracy of infrared thermometry, which is also the main reason for the limited use of infrared temperature measurement methods in industrial applications. To reduce the influence of dust on infrared temperature measurement, this paper proposes a new method for compensating measurement error caused by dust. First, the source of... View full abstract»

In this paper, we try to optimize the driving signals of certain electrochromic devices that can be potentially used in ophthalmic applications for retinal diseases. The goal is to save power while achieving optimal transmittance changes. The optimization tries to increase the devices cyclability, minimizing their power consumption and avoiding current peaks, all of this motivated to have a better... View full abstract»

Tunable diode laser absorption spectroscopy (TDLAS) tomography has been widely employed to spatially and temporally resolve gas parameters in combustion processes. The requirements placed on the spatial resolution of a tomographic image vary in industrial applications, depending on the size of the target field and the necessity to detect small features. Based on an optimized beam arrangement, this... View full abstract»

Free-space dielectric properties measurements at 10 GHz with four pairs of low-cost printed Yagi–Uda antennas are proposed for detecting foreign material in unshelled peanuts, including sticks, peanut shells, peanut raisins, and stones. The four-element array design of the Yagi–Uda antenna allowed better averaging over the entire sample volume and improved the measurement resolution. The antenna g... View full abstract»

Near-field microwave imaging is increasingly finding utility for non-invasive inspection of various critical components in a wide range of industries. Conventionally, microwave imaging is performed using probes of linear electric field polarization such as a rectangular aperture probe excited with its dominant mode. Consequently, detecting polarized targets, e.g., cracks and highly conductive line... View full abstract»

In non-destructive testing and evaluation, the microwave-based synthetic aperture radar (SAR) imaging have shown great potential in the detection of defects on buried objects such as pipes. However, due to the pipe curvature and high stand-off distance when inspecting an insulated pipe, the useful defect information used to characterize the pipe image is lost as a result of low signal-to-noise rat... View full abstract»

In this paper, exploiting a new single-step process, in-line Mach–Zehnder interferometers (M-MZIs) on microfibers of different diameters are fabricated and their refractive-index (RI) sensitivities and temperature stabilities are characterized. The M-MZI comprises a microfiber with two functionalizing miniature down-tapers inscribed along its longitudinal direction. It is fabricated exploiting a s... View full abstract»

This paper studied the relationship between the temperature/strain wavelength sensitivity of a fiber optic in-line Mach–Zehnder interferometer (MZI) sensor and the wavelength separation of the measured wavelength to the critical wavelength (CWL) in a CWL-existed interference spectrum formed by interference between LP01 and LP02 modes. The in-line MZI fiber optic sensor has be... View full abstract»

A sensitivity-enhanced strain sensor constructed by a 7-mm-long thin-core fiber (TCF) splicing with a 10-mm-long tilted fiber Bragg grating (TFBG) was proposed. The modal interferometer formed by the TCF will interact with the spectrum of the TFBG to form an overlapped spectrum, which will extremely increase the axial strain sensitivity of the TFBG. Experimental results showed that the wavelength ... View full abstract»