scholarly journals Design of low-cost wireless noise monitoring sensor unit based on IoT concept

2021 ◽  
Author(s):  
Maja Anachkova ◽  
Simona Domazetovska ◽  
Zlatko Petreski ◽  
Viktor Gavriloski
Keyword(s):  
Low Cost ◽  
Sensor Unit

scholarly journals Low-Cost and Energy-Saving Wireless Sensor Network for Real-Time Urban Mobility Monitoring System

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Joyoung Lee ◽  
Zijia Zhong ◽  
Bo Du ◽  
Slobodan Gutesa ◽  
Kitae Kim
Keyword(s):  
Energy Saving ◽  
Fiber Optics ◽  
Monitoring System ◽  
Data Center ◽  
Low Cost ◽  
Wireless Sensor ◽  
Navigation Systems ◽  
Urban Mobility ◽  
Proof Of Concept ◽  
Sensor Unit

This paper presents a low-cost and energy-saving urban mobility monitoring system based on wireless sensor networks (WSNs). The primary components of the proposed sensor unit are a Bluetooth sensor and a Zigbee transceiver. Within the WSN, the Bluetooth sensor captures the MAC addresses of Bluetooth units equipped in mobile devices and car navigation systems. The Zigbee transceiver transmits the collected MAC addresses to a data center without any major communications infrastructures (e.g., fiber optics and 3G/4G network). A total of seven prototype sensor units have been deployed on roadway segments in Newark, New Jersey, for a proof of concept (POC) test. The results of the POC test show that the performance of the proposed sensor unit appears promising, resulting in 2% of data drop rates and an improved Bluetooth capturing rate.

A low-cost integrated positioning system for autonomous off-highway vehicles

2008 ◽  
Vol 222 (11) ◽  
pp. 1997-2009 ◽  
Author(s):  
L-S Guo ◽  
Q Zhang
Keyword(s):  
Inertial Sensor ◽  
Low Cost ◽  
Maximum Error ◽  
Positioning System ◽  
Differential Gps ◽  
Fusion Algorithm ◽  
Position Information ◽  
Mems Accelerometer ◽  
Sensor Unit ◽  
Update Rate

This article reports a method for integrating a low-cost positioning system, constructed using a Garmin N17 global positioning system (GPS) and an integrated inertial sensor unit, consisting of three single-axis microelectromechanical system (MEMS) gyros and one triaxial MEMS accelerometer, for autonomous off-highway vehicle use. Based on a vehicle position—velocity—attitude (PVA) model, a data fusion algorithm was formulated to extract more accurate and reliable positioning information from the raw data sensed by the GPS and inertial sensor unit. The developed integrated positioning system (IPS) was evaluated on an agricultural utility vehicle on three different sites. A real-time kinematic (RTK) differential GPS unit, capable of providing 2–3cm dynamic positioning accuracy while the position dilution of precision is low enough, was installed on the test vehicle to provide accurate positioning references in those evaluation tests. Results obtained from those tests showed that, when the vehicle was travelling on paved roads near buildings and/or under the trees, the maximum positioning error of the developed IPS was 0.50m, and that this maximum error level was reduced to 0.30m when the vehicle was travelling in open fields. The IPS could provide a position update rate at 50Hz; even the GPS could provide only a 1Hz update rate. Test results also revealed that this system could continuously provide accurate position signals when the GPS signal is lost for up to 30s. This research verified that a low-cost IPS could provide satisfactory position information for autonomous off-highway vehicle uses.

scholarly journals Development of Wireless Monitoring System for Pulse Rate: A New Approach

Proceedings ◽  
2020 ◽  
Vol 67 (1) ◽  
pp. 13
Author(s):  
Mohammad Monirujjaman Khan ◽  
Tahia Tazin ◽  
Tabia Hossain
Keyword(s):  
Pulse Rate ◽  
Heart Diseases ◽  
Low Cost ◽  
Sensor Unit ◽  
Wireless Monitoring ◽  
Remote Transmission ◽  
Heartbeat Rate ◽  
Arduino Uno ◽  
Artery Disease ◽  
Rate Sensor

Various types of heart diseases, including cardiac arrhythmia, myocardial infarction, and coronary artery disease, are one of the main reasons behind the causes of death around the world. It can be mitigated if we know the pulse rate and monitor it properly. However, constant monitoring can be expensive for the private sector and so we are proposing to solve the problem by the implementation of a wireless network based on Bluetooth. The pulse rate data is sent from Arduino Uno via Bluetooth to Smartphone and it can be analyzed by the user and sent it to an expert doctor with a low cost and more efficiently. This project identifies with a heartbeat rate estimation gadget, including a heartbeat rate sensor unit that distinguishes a client’s heartbeat rate, a sign preparing unit that receives and measures the sign produced from the sensor, and a remote sign sending unit that takes the sign from the handling unit and then communicates the sign to the arranged gadget. The sensor unit distinguishes the recurrence of the progress of blood thickness to get the pulse, carefully and productively finding the location of the pulse, participating in the method of remote transmission and accordingly, our motivation of advancing precision of identification and improving comfort of utilizing is accomplished. The model incorporates Arduino Uno, Pulse Rate Sensor, Bluetooth Board, Breadboard, USB link, and so forth.We communicate the information utilizing Bluetooth to Smartphone utilizing Pulse Rate Monitor circuit furnished with Arduino Uno.

Design and development af a lightweight low-cost sensor unit for the parallel measurement of particles, gaseous air pollutants, atmospheric pressure, temperature and humidity

2021 ◽  
Author(s):  
Konradin Weber ◽  
Christian Fischer ◽  
Detlef Amend ◽  
Martin Lange ◽  
Tobias Pohl ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Low Cost ◽  
Lightweight Design ◽  
Measurement Techniques ◽  
Environmental Parameters ◽  
Large Area ◽  
Sensor Unit ◽  
Battery Capacity ◽  
Temperature And Humidity ◽  
Parallel Measurement

<p>There are frequent measurement tasks, where lightweight low-cost sensor units are of interest for the parallel measurement of several environmental parameters. Moreover, often measurements of environmental parameters are necessary not only at one specific point, but distributed over a large area or at different altidudes. In this case it makes sense to utilize lightweight low-cost sensor units. Because of the low price the can be produced in many exemplares und used at several places in parallel.</p> <p>The Laboratory for Environmental Measurement Techniques (UMT) at the Duesseldorf University of Applied Sciences (HSD) has developed such electronic units with following features:</p> <ul> <li>They can measure particulate matter PM10, PM2.5, PM1, PNC and size distribution using particulate sensors of different brands, e.g. Alphasense sensors R2 or N3 or Sensirion SDS 30.</li> <li>Additionally they have analog interfaces so that they can be equipped with sensor units for gaseous pollutants, e.g, Alphasense sensors for SO<sub>2</sub>, NO<sub>2</sub>, Ozone and many other gases like CO<sub>2</sub> using Sensirion sensors.</li> <li>In parallel atmospheric pressure, temperature and humidity can be measured by additional dedicated sensors.</li> <li>The sensor units are equipped with a SD card memory and optionally with I<sup>2</sup>C or RS232 interface.</li> <li>Additionally the data can be transmitted in a wireless way to a server on 433 MHz, 868 MHz, 2.4 GHz ISM-band or via LTE or IRIDIUM.</li> <li>The main electronic unit is of lightweight design. Therefore the low-cost sensor units can be used easily on mobile platformes like drones or bicycles.</li> <li>The sensor unit has a low power consumption, so it can be operated independently for days or weeks, depending on the battery capacity.</li> <li>A GPS module enables a timestamp for the data and gives position and altitude.</li> </ul> <p>Several fully installed measurement units have been tested by UMT groundbased at industrial and heavily polluted urban sites in Germany. Moreover, such a unit has been operated on a measurement drone for taking vertical and horizontal pollutant profiles. It is planned to use these sensor units also at volcanic sites in a mobile and stationary way. The low-cost sensor units have been intercompared with certified air pollution measurement systems to assure the data quality.</p>

A Wireless Power-Free Pressure Sensor for Real-Time In Vivo Gastrointestinal Pressure Monitoring

2014 ◽  
Vol 609-610 ◽  
pp. 993-996
Author(s):  
Qiang Shi ◽  
De Yong Chen ◽  
Jun Bo Wang ◽  
Kai Kai Bao ◽  
Li Juan Liu
Keyword(s):  
Real Time ◽  
Pressure Sensor ◽  
Low Cost ◽  
Wireless Power ◽  
Pressure Monitoring ◽  
Device Structure ◽  
Detection Mechanism ◽  
Sensor Unit ◽  
Detection Unit

A wireless and power-free pressure sensor system capable of real time in vivo gastrointestinal pressure monitoring has been developed. This system contains a sensor unit and a detection unit. Based on mutual inductance detection mechanism, the sensor is featured with simple device structure and therefore low cost. The packaged sensor unit was tested. Results obtained from experiment demonstrated that this sensor has a sensitivity of 0.2115 kHz / kPa within a pressure range-10~30 kPa. The in vivo testing result not only indicates a period of 2 contractions per minute peristalsis of rabbit stomach but also validates the feasibility of this real time wireless gastrointestinal pressure monitoring system.

scholarly journals Design of a Plantar Pressure Insole Measuring System Based on Modular Photoelectric Pressure Sensor Unit

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3780
Author(s):  
Bin Ren ◽  
Jianwei Liu
Keyword(s):  
Plantar Pressure ◽  
Cooperative Control ◽  
Low Cost ◽  
Fast Response ◽  
Photoelectric Effect ◽  
Measuring System ◽  
Human Walking ◽  
Human Gait ◽  
Pressure Sensing ◽  
Sensor Unit

Accurately perceiving and predicting the parameters related to human walking is very important for man–machine coupled cooperative control systems such as exoskeletons and power prostheses. Plantar pressure data is rich in human gait and posture information and is an essential source of reference information as the input of the exoskeleton control system. Therefore, the proper design of the pressure sensing insole and validation is a big challenge considering the requirements such as convenience, reliability, no interference and so on. In this research, we developed a low-cost modular sensing unit based on the principle of photoelectric sensing and designed a plantar pressure sensing insole to achieve the purpose of sensing human walking gait and posture information. On the one hand, the sensor unit is made of economy-friendly commercial flexible circuits and elastic silicone, and the mechanical and electrical characteristics of the modular sensor unit are evaluated by a self-developed pressure-related calibration system. The calibration results show that the modular sensor based on the photoelectric sensing principle has fast response and negligible hysteresis. On the other hand, we analyzed the area where the plantar pressure is densely distributed. One benefit of the modular sensing unit design is that it is rather convenient to fabricate different insole solutions, so we fabricated and compared several pressure-sensitive insole solutions in this preliminary study. During the dynamic locomotion experiments of wearing the pressure-sensing insole, the time series signal of each sensor unit was collected and analyzed. The results show that the pressure sensing insole based on the photoelectric effect can sense the distribution of the plantar pressure by capturing the deformation of the insole caused by the foot contact during locomotion, and provide reliable gait information for wearable applications.

Decomposition of the metastable beta titanium alloy Ti-15-3

1983 ◽  
Vol 41 ◽  
pp. 264-265
Author(s):  
Y. L. Chen ◽  
S. Fujlshiro
Keyword(s):  
Low Cost ◽  
High Strength ◽  
Alpha Phase ◽  
Thick Sheet ◽  
Omega Phase ◽  
Beta Titanium Alloy ◽  
Beta Titanium ◽  
Beta Matrix ◽  
Metastable Beta ◽  
Very High

Metastable beta titanium alloys have been known to have numerous advantages such as cold formability, high strength, good fracture resistance, deep hardenability, and cost effectiveness. Very high strength is obtainable by precipitation of the hexagonal alpha phase in a bcc beta matrix in these alloys. Precipitation hardening in the metastable beta alloys may also result from the formation of transition phases such as omega phase. Ti-15-3 (Ti-15V- 3Cr-3Al-3Sn) has been developed recently by TIMET and USAF for low cost sheet metal applications. The purpose of the present study was to examine the aging characteristics in this alloy.The composition of the as-received material is: 14.7 V, 3.14 Cr, 3.05 Al, 2.26 Sn, and 0.145 Fe. The beta transus temperature as determined by optical metallographic method was about 770°C. Specimen coupons were prepared from a mill-annealed 1.2 mm thick sheet, and solution treated at 827°C for 2 hr in argon, then water quenched. Aging was also done in argon at temperatures ranging from 316 to 616°C for various times.

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