scholarly journals AUTOMATED SENSORY MONITORING SYSTEM PROTOTYPE FOR CONTINUOUS MONITORING OF MATERIAL AND STRUCTURE STATE

2021 ◽  
Vol 2 ◽  
pp. 58-61
Author(s):  
Maris Hauka ◽  
Vitālijs Pavelko ◽  
Ilmars Blumbergs ◽  
Raivis Kubulins
Keyword(s):  
Continuous Monitoring ◽  
Cost Effective ◽  
Sensor System ◽  
Monitoring Systems ◽  
Integrated Sensor ◽  
Practical Solution ◽  
Structure Monitoring ◽  
Structure State ◽  
Scientific Project ◽  
System Prototype

The goal of this article is to solve problems of automated monitoring systems of industrial and aviation constructions. Based on the latest research results, the most cost-effective solutions are covered, and a practical solution is offered. This article is part of the scientific project “Development of an integrated sensor system for material and structure monitoring”. The article describes the problem and suggests a practical solution for an integrated sensor system for material and structure monitoring prototype. 

Periodic and Continuous Vibration Monitoring for Preventive/Predictive Maintenance of Rotating Machinery

1987 ◽  
Vol 109 (2) ◽  
pp. 159-167 ◽  
Author(s):  
W. C. Laws ◽  
A. Muszynska
Keyword(s):  
Vibration Analysis ◽  
Continuous Monitoring ◽  
Cost Effective ◽  
Predictive Maintenance ◽  
Vibration Monitoring ◽  
Alternative Methods ◽  
Monitoring Systems ◽  
High Quality ◽  
Analysis Techniques ◽  
Vibration Data

The application of vibration monitoring as part of Preventive/Predictive Maintenance programs is discussed. Several alternative methods, including periodic and continuous monitoring techniques, are described. Emphasis is given to the importance of selecting vibration transducers with due regard for the specific machinery type. The equally important need to install monitoring systems which are cost effective and provide genuinely useful information for maintenance engineers and vibration analysts is also highlighted. It is argued that critical machinery should be monitored continuously, and in cases when more detailed investigation is required that high-quality Predictive Maintenance vibration analysis techniques be applied. The need is also emphasized for specialist interpretation of vibration data in order to identify specific machinery malfunctions, of which several examples are given.

Comparison of Glucose Concentrations between Flash and Continuous Monitoring Systems in Patients with Diabetes Mellitus

Diabetes ◽  
2018 ◽  
Vol 67 (Supplement 1) ◽  
pp. 917-P
Author(s):  
RYO KUMAGAI ◽  
AIKO MURAMATSU ◽  
MASANAO FUJII ◽  
YUKINO KATAKURA ◽  
KEIKO FUJIE ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Continuous Monitoring ◽  
Monitoring Systems ◽  
Patients With Diabetes

Experience of Operation of the Mine Winding Plants Equipped with Continuous Monitoring Systems

2019 ◽  
pp. 52-58
Author(s):  
G.D. Trifanov ◽  
◽  
A.A. Knyazev ◽  
A.P. Filatov ◽  
V.V. Lauk ◽  
...  
Keyword(s):  
Continuous Monitoring ◽  
Monitoring Systems

scholarly journals Hafnium Zirconium Oxide Thin Films for CMOS Compatible Pyroelectric Infrared Sensors

2021 ◽  
Vol 6 (1) ◽  
pp. 27
Author(s):  
Clemens Mart ◽  
Malte Czernohorsky ◽  
Kati Kühnel ◽  
Wenke Weinreich
Keyword(s):  
Thin Films ◽  
Lead Zirconate Titanate ◽  
Cost Effective ◽  
Atomic Layer ◽  
Lead Zirconate ◽  
Temperature Oscillation ◽  
Current Profile ◽  
Infrared Sensors ◽  
Integrated Sensor ◽  
Ferroelectric Hysteresis

Pyroelectric infrared sensors are often based on lead-containing materials, which are harmful to the environment and subject to governmental restrictions. Ferroelectric Hf1−xZrxO2 thin films offer an environmentally friendly alternative. Additionally, CMOS integration allows for integrated sensor circuits, enabling scalable and cost-effective applications. In this work, we demonstrate the deposition of pyroelectric thin films on area-enhanced structured substrates via thermal atomic layer deposition. Scanning electron microscopy indicates a conformal deposition of the pyroelectric film in the holes with a diameter of 500 nm and a depth of 8 μm. By using TiN electrodes and photolithography, capacitor structures are formed, which are contacted via the electrically conductive substrate. Ferroelectric hysteresis measurements indicate a sizable remanent polarization of up to 331 μC cm−2, which corresponds to an area increase of up to 15 by the nanostructured substrate. For pyroelectric analysis, a sinusoidal temperature oscillation is applied to the sample. Simultaneously, the pyroelectric current is monitored. By assessing the phase of the measured current profile, the pyroelectric origin of the signal is confirmed. The devices show sizable pyroelectric coefficients of −475 μC m−2 K−1, which is larger than that of lead zirconate titanate (PZT). Based on the experimental evidence, we propose Hf1−xZrxO2 as a promising material for future pyroelectric applications.

scholarly journals Pressure Sensor System for Customized Scoliosis Braces

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1153
Author(s):  
Franz Konstantin Fuss ◽  
Asliza Ahmad ◽  
Adin Ming Tan ◽  
Rizal Razman ◽  
Yehuda Weizman
Keyword(s):  
Pressure Sensor ◽  
Testing Machine ◽  
Force Plate ◽  
Cost Effective ◽  
Mobile Systems ◽  
Sensor System ◽  
Closed Cell ◽  
Hard Shell ◽  
Energy Absorbers ◽  
Material Testing Machine

Hard-shell thoracolumbar sacral orthoses (TLSOs) are used for treating idiopathic scoliosis, a deformation of the spine with a sideways curvature. The pressure required inside the TLSO for ideal corrective results remains unclear. Retrofitting TLSOs with commercially available pressure measurement systems is expensive and can only be performed in a laboratory. The aim of this study was to develop a cost-effective but accurate pressure sensor system for TLSOs. The sensor was built from a piezoresistive polymer, placed between two closed-cell foam liners, and evaluated with a material testing machine. Because foams are energy absorbers, the pressure-conductance curve was affected by hysteresis. The sensor was calibrated on a force plate with the transitions from loading to unloading used to establish the calibration curve. The root mean square error was 12% on average within the required pressure range of 0.01–0.13 MPa. The sensor reacted to the changing pressure during breathing and different activities when tested underneath a chest belt at different tensions. The peak pressure reached 0.135 MPa. The sensor was further tested inside the scoliosis brace during different activities. The measured pressure was 0.014–0.124 MPa. The results from this study enable cheaper and mobile systems to be used for clinical studies on the comfort and pressure of braces during daily activities.

scholarly journals Use of electrochemical sensors for measurement of air pollution: correcting interference response and validating measurements

2017 ◽  
Vol 10 (9) ◽  
pp. 3575-3588 ◽  
Author(s):  
Eben S. Cross ◽  
Leah R. Williams ◽  
David K. Lewis ◽  
Gregory R. Magoon ◽  
Timothy B. Onasch ◽  
...  
Keyword(s):  
Air Pollution ◽  
Air Quality ◽  
Lower Cost ◽  
Electrochemical Sensors ◽  
Air Pollutant ◽  
Sensor System ◽  
Time Interval ◽  
High Dimensional Model Representation ◽  
Integrated Sensor ◽  
Mean Square Errors

Abstract. The environments in which we live, work, and play are subject to enormous variability in air pollutant concentrations. To adequately characterize air quality (AQ), measurements must be fast (real time), scalable, and reliable (with known accuracy, precision, and stability over time). Lower-cost air-quality-sensor technologies offer new opportunities for fast and distributed measurements, but a persistent characterization gap remains when it comes to evaluating sensor performance under realistic environmental sampling conditions. This limits our ability to inform the public about pollution sources and inspire policy makers to address environmental justice issues related to air quality. In this paper, initial results obtained with a recently developed lower-cost air-quality-sensor system are reported. In this project, data were acquired with the ARISense integrated sensor package over a 4.5-month time interval during which the sensor system was co-located with a state-operated (Massachusetts, USA) air quality monitoring station equipped with reference instrumentation measuring the same pollutant species. This paper focuses on validating electrochemical (EC) sensor measurements of CO, NO, NO2, and O3 at an urban neighborhood site with pollutant concentration ranges (parts per billion by volume, ppb; 5 min averages, ±1σ): [CO]  =  231 ± 116 ppb (spanning 84–1706 ppb), [NO]  =  6.1 ± 11.5 ppb (spanning 0–209 ppb), [NO2]  =  11.7 ± 8.3 ppb (spanning 0–71 ppb), and [O3]  =  23.2 ± 12.5 ppb (spanning 0–99 ppb). Through the use of high-dimensional model representation (HDMR), we show that interference effects derived from the variable ambient gas concentration mix and changing environmental conditions over three seasons (sensor flow-cell temperature  =  23.4 ± 8.5 °C, spanning 4.1 to 45.2 °C; and relative humidity  =  50.1 ± 15.3 %, spanning 9.8–79.9 %) can be effectively modeled for the Alphasense CO-B4, NO-B4, NO2-B43F, and Ox-B421 sensors, yielding (5 min average) root mean square errors (RMSE) of 39.2, 4.52, 4.56, and 9.71 ppb, respectively. Our results substantiate the potential for distributed air pollution measurements that could be enabled with these sensors.

scholarly journals Towards Cost-Effective Operational Monitoring Systems for Complex Waters: Analyzing Small-Scale Coastal Processes with Optical Transmissometry

PLoS ONE ◽  
2017 ◽  
Vol 12 (1) ◽  
pp. e0170706 ◽  
Author(s):  
Marta Ramírez-Pérez ◽  
Rafael Gonçalves-Araujo ◽  
Sonja Wiegmann ◽  
Elena Torrecilla ◽  
Raul Bardaji ◽  
...  
Keyword(s):  
Cost Effective ◽  
Small Scale ◽  
Monitoring Systems ◽  
Coastal Processes ◽  
Operational Monitoring
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