Papers by Keyword: Pressure Sensor

Abstract: This work introduces a novel PVP/SbSI nanocomposite that exhibits a significant piezoelectric response to variations in air pressure. Demonstrated functionalities include its use as a pressure sensor and nanogenerator under dynamic conditions. For a sandwich-type configuration with nanofibers oriented perpendicularly to the electrodes, the sample generated a peak voltage of about 2.1 V, a charge generation rate of 97.1 pC/N, a sensitivity of about 0.23 mV/bar, a surface power density of over 12 µW/cm², and an energy output of 3.5 nJ under a differential pressure of 17 bar. The study also examines the agreement among various methods of efficiency evaluation.

Abstract: The article discusses the principles of operation of loading devices of artillery weapons with a focus on the ramming device as the most important part performing mechanical movement with the round. The attention is focused on hydraulically driven ramming devices, where the possibility of using linear and rotary hydraulic drives is investigated. At the same time, the possibilities of experimental determination of model parameters such as motor damping coefficients, hydraulic resistances, reduced values of compressibility coefficients in the given circuit are presented. The advantages and disadvantages of the used flowmeters are shown for their comparison, from which it is possible to derive the velocity of insertion of round parts. The determined parameters are used for modelling the movement of the rammer and the projectile. Experimental procedures can also be used for the diagnosis and technical control of ramming devices according to national defense standards based on STANAG standards and calculation methods when upgrading existing hydraulically driven loading devices.

Abstract: In the research field of smart textiles, one main goal concerns quantifying environmental forces acting on the wearer's body since textiles, acting as the boundary between the two, are an excellent way of integrating sensors. Integrating strain and pressure sensors into wearables promises a simple way of monitoring a person's posture and forces acting on their body. Sensors relying on a capacitive measuring principle are highly suitable for this, as they are less sensitive to changes in temperature than resistive or inductive types. In this paper, textile-based capacitive sensors are produced by braiding conductive yarns with and without an electrically insulating TPU sheath. The produced sensors are analyzed in cyclic strain and compression tests. Moreover, their behavior under changing temperatures is tested to prove their resilience against environmental changes. To extend their capabilities from an integral measurement to a localized assessment of the strain, time-domain-reflectometry (TDR) is employed. Finally, the sensors are integrated into a flexible actuated bending beam, and their adoption for soft robotics is discussed. Strain is tested cyclically, showing good long-term stability. Pressure sensitivity is measured in a static compression test under increasing force. TDR is used to localize strain in two discreet sections of the sensor. Although strain could not be quantified through TDR, characteristic points in the measured response signal indicating the position of the strain were identified. Textile-based capacitive sensors are suitable for strain up to 10 % and pressure up to 8 N. The determined gauge factors are satisfactory, with strain sensors inherently having a higher gauge factor than pressure sensors. Furthermore, they display good long-term stability and no adverse reaction to changes in temperature. TDR is proven to provide localization of strain in flexible sensors.

Abstract: The need to create highly accurate pressure sensors that capable operate under extreme conditions in aviation, rocket and space equipment increases and becomes more relevant. The unique properties of diamond make it a promising material for microelectronic sensors. Sensitive elements of pressure sensors were developed where a resilient element is formed from silicon but resistance strain gauges are formed from a boron-doped polycrystalline diamond film.

Abstract: Manual therapy is used to treat patients with neck pain, and mobilization techniques are practiced clinically by physiotherapists. To evaluate the effectiveness of therapy it is necessary to measure the applied manual therapy forces. We present the sensitive glove concept designed to measure the forces applied during therapy. The sensitive glove is equipped with multiple textile-based sensors connected by sewing technology, in which changes in electrical resistance were observed due to the applied force. The number and position of sensors were defined basing on the experience of manual therapists and practicable techniques. Glove fabrication technologies were tested practically – sensors were glued and sewn on the base material and simple conductive threads were sewn by hand and with a sewing machine. Technological solutions were evaluated both in terms of visual and technical aspects. The final version of the sensitive glove was assessed by an expert and recommendations were given for improving further prototypes.

Abstract: This paper examines the modeling, simulation and optimization of CMOS–MEMS integrated pressure sensor based on suspended gate MOSFET. The pressure Sensor consists of a square poly silicone suspended membrane, which is the movable gate of the NMOS. This NMOS is designed using 2 μm CMOS technology. The mathematical model describing the complete behaviour of the PSFET pressure sensor has been described. Finite element method (FEA) based COMSOL Multiphysics is utilized for the simulation of pressure sensor. The simulation results show that, the output current of the pressure sensor varied from 355 to 3624 μA as the pressure changed from zero to 180 kPa and high pressure sensitivity of 15,18μA/kPa. Furthermore, this study emphasizes on the influence of the channel geometric parameters on the aforementioned characteristics to optimize the sensor performance.

Abstract: This system is designed for advance Robotic control. It based on sensor data acquisition and software data processing. With those systems controlling a robotic hand by hydraulic and electric means. It is separated by two different sections. First, data acquisition section with differential sensor data (Gyro sensor, Flex sensor, Pressure sensor). Second, software processed data application system consisting of robotic hand. Specialty of this system is it gives precise control of robotic arm following human hand movement. It also gives touch and pressure feelings in robotic hand. A lot of work can be done easily with the help of it. Like this system gives remote bomb disposal, hazardous environmental work remotely, remote operation, remote medical help and so on.

Abstract: Smart home automation applications require a dense information network for proper func-tionality. Air-conditioning or filtration systems, for example, must detect airflows caused by openwindows and doors. An unambiguous detection of such airflows can be performed by a distributedsensor network. Current off-the-shelf sensors often lack processing and communication units, resulting in a large design assembly of discrete integrated circuits (ICs) on one printed circuit board (PCB)that requires additional power supply. Distributing such designs within a home without interferingwith the existing surroundings proves to be difficult in terms of acceptance and usability. This paperpresents a solution by offering an integrated design that includes a microelectromechanical system(MEMS) pressure sensor element along with an analog to digital converter (ADC) and a customizableand programmable processing unit. The integration leads to a smaller overall footprint and reducedpower consumption, which positively affects the acceptance rate of distributed smart sensor networksfor home automation. Clear interfaces between the components ensure an extensible and adaptablesystem design suitable for further smart sensor applications, resulting in a smart sensor framework.

Abstract: The design, fabrication, early testing and material property assessment work related to the development of an opto-mechanical pressure sensor implemented with hetero-epitaxial 3C-SiC on silicon is described. The sensor is constituted by a single-crystal 3C-SiC membrane whose deflection upon pressure application is measured using a fiber-optic interferometric readout. The fabrication of sensor prototypes and micromachined 3C-SiC membranes for test purposes is described and the results of bulge tests on the membranes are reported. Functional characterization of the sensor prototypes in the pressure range 0-3 bar is also presented, showing good linearity and reproducibility of the sensor response, sensitivity of roughly 2 mV/bar and estimated pressure resolution around 0.5 bar on a 0-200 bar dynamic range.

Abstract: An integrated pressure and magnetic field sensor based on piezoresistance effect is proposedin this paper. The integrated sensor is composed of a C-type silicon cup, ferromagnetic materialand Wheatstone bridge constructed by four metal oxide semiconductor field effect transistors(MOSFETs) channel resistances as piezoresistances. Based on the piezoresistance effect of channelresistances, the measurement to the external pressure P and magnetic field B can be achieved by thesensor. Through using complementary metal oxide semiconductor (CMOS) technology and microelectromechnicalsystem (MEMS) technology, the sensor chip was designed and fabricated on <100>orientation silicon substrates, locating the ferromagnetic material on its squared silicon membranecenter. The experimental results show that when supply voltage of the sensor is 2.0 V, the pressuresensitivity of sensor is 0.39 mV/kPa (B=0 T), and the magnetic field sensitivity of sensor is 1.48 mV/T(P=0 kPa).