Sensors

Research

Jump to: Review

22 pages, 3217 KB

Open AccessArticle

by Nirvana Meratnia, Berend Jan Van der Zwaag, Hylke W. Van Dijk, Dennis J.A. Bijwaard and Paul J.M. Havinga

Sensors 2010, 10(9), 8504-8525; https://doi.org/10.3390/s100908504 - 10 Sep 2010

Cited by 10 | Viewed by 14865

Abstract

This paper provides an overview of scientific and industrial developments of the last decade in the area of sensor networks in The Netherlands (Low Lands). The goal is to highlight areas in which the Netherlands has made most contributions and is currently a [...] Read more.

This paper provides an overview of scientific and industrial developments of the last decade in the area of sensor networks in The Netherlands (Low Lands). The goal is to highlight areas in which the Netherlands has made most contributions and is currently a dominant player in the field of sensor networks. On the one hand, motivations, addressed topics, and initiatives taken in this period are presented, while on the other hand, special emphasis is given to identifying current and future trends and formulating a vision for the coming five to ten years. The presented overview and trend analysis clearly show that Dutch research and industrial efforts, in line with recent worldwide developments in the field of sensor technology, present a clear shift from sensor node platforms, operating systems, communication, networking, and data management aspects of the sensor networks to reasoning/cognition, control, and actuation. Full article

(This article belongs to the Special Issue State-of-the-Art Sensors Technology in The Netherlands)

► Show Figures

Graphical abstract

17 pages, 1300 KB

Open AccessArticle

Assessment of Relative Accuracy of AHN-2 Laser Scanning Data Using Planar Features

by Corné van der Sande, Sylvie Soudarissanane and Kourosh Khoshelham

Sensors 2010, 10(9), 8198-8214; https://doi.org/10.3390/s100908198 - 1 Sep 2010

Cited by 68 | Viewed by 12880

Abstract

AHN-2 is the second part of the Actueel Hoogtebestand Nederland project, which concerns the acquisition of high-resolution altimetry data over the entire Netherlands using airborne laser scanning. The accuracy assessment of laser altimetry data usually relies on comparing corresponding tie elements, often points [...] Read more.

AHN-2 is the second part of the Actueel Hoogtebestand Nederland project, which concerns the acquisition of high-resolution altimetry data over the entire Netherlands using airborne laser scanning. The accuracy assessment of laser altimetry data usually relies on comparing corresponding tie elements, often points or lines, in the overlapping strips. This paper proposes a new approach to strip adjustment and accuracy assessment of AHN-2 data by using planar features. In the proposed approach a transformation is estimated between two overlapping strips by minimizing the distances between points in one strip and their corresponding planes in the other. The planes and the corresponding points are extracted in an automated segmentation process. The point-to-plane distances are used as observables in an estimation model, whereby the parameters of a transformation between the two strips and their associated quality measures are estimated. We demonstrate the performance of the method for the accuracy assessment of the AHN-2 dataset over Zeeland province of The Netherlands. The results show vertical offsets of up to 4 cm between the overlapping strips, and horizontal offsets ranging from 2 cm to 34 cm. Full article

(This article belongs to the Special Issue State-of-the-Art Sensors Technology in The Netherlands)

► Show Figures

Graphical abstract

12 pages, 284 KB

Open AccessArticle

A Fluorescent Thermometer Based on a Pyrene-Labeled Thermoresponsive Polymer

by Christian Pietsch, Antje Vollrath, Richard Hoogenboom and Ulrich S. Schubert

Sensors 2010, 10(9), 7979-7990; https://doi.org/10.3390/s100907979 - 27 Aug 2010

Cited by 64 | Viewed by 14125

Abstract

Thermoresponsive polymers that undergo a solubility transition by variation of the temperature are important materials for the development of ‘smart’ materials. In this contribution we exploit the solubility phase transition of poly(methoxy diethylene glycol methacrylate), which is accompanied by a transition from hydrophilic [...] Read more.

Thermoresponsive polymers that undergo a solubility transition by variation of the temperature are important materials for the development of ‘smart’ materials. In this contribution we exploit the solubility phase transition of poly(methoxy diethylene glycol methacrylate), which is accompanied by a transition from hydrophilic to hydrophobic, for the development of a fluorescent thermometer. To translate the polymer phase transition into a fluorescent response, the polymer was functionalized with pyrene resulting in a change of the emission based on the microenvironment. This approach led to a soluble polymeric fluorescent thermometer with a temperature range from 11 °C to 21 °C. The polymer phase transition that occurs during sensing is studied in detail by dynamic light scattering. Full article

(This article belongs to the Special Issue State-of-the-Art Sensors Technology in The Netherlands)

► Show Figures

Graphical abstract

15 pages, 419 KB

Open AccessArticle

Bayesian Model for Matching the Radiometric Measurements of Aerospace and Field Ocean Color Sensors

by Mhd. Suhyb Salama and Zhongbo Su

Sensors 2010, 10(8), 7561-7575; https://doi.org/10.3390/s100807561 - 11 Aug 2010

Cited by 14 | Viewed by 9777

Abstract

A Bayesian model is developed to match aerospace ocean color observation tofield measurements and derive the spatial variability of match-up sites. The performance of the model is tested against populations of synthesized spectra and full and reduced resolutions of MERIS data. The model [...] Read more.

A Bayesian model is developed to match aerospace ocean color observation tofield measurements and derive the spatial variability of match-up sites. The performance of the model is tested against populations of synthesized spectra and full and reduced resolutions of MERIS data. The model derived the scale difference between synthesized satellite pixel and point measurements with R2 > 0.88 and relative error < 21% in the spectral range from 400 nm to 695 nm. The sub-pixel variabilities of reduced resolution MERIS image are derived with less than 12% of relative errors in heterogeneous region. The method is generic and applicable to different sensors. Full article

(This article belongs to the Special Issue State-of-the-Art Sensors Technology in The Netherlands)

► Show Figures

Graphical abstract

18 pages, 282 KB

Open AccessArticle

T-Patterns Revisited: Mining for Temporal Patterns in Sensor Data

by Albert Ali Salah, Eric Pauwels, Romain Tavenard and Theo Gevers

Sensors 2010, 10(8), 7496-7513; https://doi.org/10.3390/s100807496 - 10 Aug 2010

Cited by 16 | Viewed by 11398

Abstract

The trend to use large amounts of simple sensors as opposed to a few complex sensors to monitor places and systems creates a need for temporal pattern mining algorithms to work on such data. The methods that try to discover re-usable and interpretable [...] Read more.

The trend to use large amounts of simple sensors as opposed to a few complex sensors to monitor places and systems creates a need for temporal pattern mining algorithms to work on such data. The methods that try to discover re-usable and interpretable patterns in temporal event data have several shortcomings. We contrast several recent approaches to the problem, and extend the T-Pattern algorithm, which was previously applied for detection of sequential patterns in behavioural sciences. The temporal complexity of the T-pattern approach is prohibitive in the scenarios we consider. We remedy this with a statistical model to obtain a fast and robust algorithm to find patterns in temporal data. We test our algorithm on a recent database collected with passive infrared sensors with millions of events. Full article

(This article belongs to the Special Issue State-of-the-Art Sensors Technology in The Netherlands)

► Show Figures

Graphical abstract

13 pages, 909 KB

Open AccessArticle

High Accuracy Acoustic Relative Humidity Measurement inDuct Flow with Air

by Wilhelm van Schaik, Mart Grooten, Twan Wernaart and Cees van der Geld

Sensors 2010, 10(8), 7421-7433; https://doi.org/10.3390/s100807421 - 9 Aug 2010

Cited by 21 | Viewed by 13188

Abstract

An acoustic relative humidity sensor for air-steam mixtures in duct flow is designed and tested. Theory, construction, calibration, considerations on dynamic response and results are presented. The measurement device is capable of measuring line averaged values of gas velocity, temperature and relative humidity [...] Read more.

An acoustic relative humidity sensor for air-steam mixtures in duct flow is designed and tested. Theory, construction, calibration, considerations on dynamic response and results are presented. The measurement device is capable of measuring line averaged values of gas velocity, temperature and relative humidity (RH) instantaneously, by applying two ultrasonic transducers and an array of four temperature sensors. Measurement ranges are: gas velocity of 0–12 m/s with an error of ±0.13 m/s, temperature 0–100 °C with an error of ±0.07 °C and relative humidity 0–100% with accuracy better than 2 % RH above 50 °C. Main advantage over conventional humidity sensors is the high sensitivity at high RH at temperatures exceeding 50 °C, with accuracy increasing with increasing temperature. The sensors are non-intrusive and resist highly humid environments. Full article

(This article belongs to the Special Issue State-of-the-Art Sensors Technology in The Netherlands)

► Show Figures

Graphical abstract

20 pages, 582 KB

Open AccessArticle

Mobile Sensor Networks for Inspection Tasks in Harsh Industrial Environments

by Jacob Mulder, Xinyu Wang, Franke Ferwerda and Ming Cao

Sensors 2010, 10(3), 1599-1618; https://doi.org/10.3390/s100301599 - 1 Mar 2010

Cited by 1 | Viewed by 9703

Abstract

Recent advances in sensor technology have enabled the fast development of mobile sensor networks operating in various unknown and sometimes hazardous environments. In this paper, we introduce one integrative approach to design, analyze and test distributed control algorithms to coordinate a network of [...] Read more.

Recent advances in sensor technology have enabled the fast development of mobile sensor networks operating in various unknown and sometimes hazardous environments. In this paper, we introduce one integrative approach to design, analyze and test distributed control algorithms to coordinate a network of autonomous mobile sensors by utilizing both simulation tools and a robotic testbed. The research has been carried out in the context of the mobile sensing project, PicoSmart, in the northern provinces of the Netherlands for the inspection of natural gas pipelines. Full article

(This article belongs to the Special Issue State-of-the-Art Sensors Technology in The Netherlands)

► Show Figures

Review

Jump to: Research

19 pages, 140 KB

Open AccessReview

Sensors and Clinical Mastitis—The Quest for the Perfect Alert

by Henk Hogeveen, Claudia Kamphuis, Wilma Steeneveld and Herman Mollenhorst

Sensors 2010, 10(9), 7991-8009; https://doi.org/10.3390/s100907991 - 27 Aug 2010

Cited by 148 | Viewed by 16910

Abstract

When cows on dairy farms are milked with an automatic milking system or in high capacity milking parlors, clinical mastitis (CM) cannot be adequately detected without sensors. The objective of this paper is to describe the performance demands of sensor systems to detect [...] Read more.

When cows on dairy farms are milked with an automatic milking system or in high capacity milking parlors, clinical mastitis (CM) cannot be adequately detected without sensors. The objective of this paper is to describe the performance demands of sensor systems to detect CM and evaluats the current performance of these sensor systems. Several detection models based on different sensors were studied in the past. When evaluating these models, three factors are important: performance (in terms of sensitivity and specificity), the time window and the similarity of the study data with real farm data. A CM detection system should offer at least a sensitivity of 80% and a specificity of 99%. The time window should not be longer than 48 hours and study circumstances should be as similar to practical farm circumstances as possible. The study design should comprise more than one farm for data collection. Since 1992, 16 peer-reviewed papers have been published with a description and evaluation of CM detection models. There is a large variation in the use of sensors and algorithms. All this makes these results not very comparable. There is a also large difference in performance between the detection models and also a large variation in time windows used and little similarity between study data. Therefore, it is difficult to compare the overall performance of the different CM detection models. The sensitivity and specificity found in the different studies could, for a large part, be explained in differences in the used time window. None of the described studies satisfied the demands for CM detection models. Full article

(This article belongs to the Special Issue State-of-the-Art Sensors Technology in The Netherlands)

► Show Figures

Journal Menu

Journal Browser

State-of-the-Art Sensors Technology in The Netherlands

Share This Special Issue

Special Issue Editor

Special Issue Information

Keywords

Benefits of Publishing in a Special Issue

Published Papers (8 papers)

Research

Review

Further Information

Guidelines

MDPI Initiatives

Follow MDPI