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Sensors, Volume 21, Issue 19

2021 October-1 - 373 articles

Cover Story: Flexible and biodegradable sensors are advantageous for their versatility in a range of areas from agriculture to smart packaging. This work characterizes the performance of capacitive relative humidity sensors printed on different biodegradable substrates. The behavior of polylactide (PLA), glossy paper, and potato starch as a sensing layer is compared to that of nonbiodegradable polyethylene terephthalate (PET). Capacitance across the inkjet-printed electrodes is measured in controlled environmental conditions ranging from 15 to 90% relative humidity. The sensitivity, response time, hysteresis, and thermal drift are tested and compared for each sensor. This work shows potential for the use of biodegradable sensors as renewable materials become more widespread. View this paper
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Articles (373)

  • Article
  • Open Access
9 Citations
4,791 Views
15 Pages

8 October 2021

Human-robot interaction has received a lot of attention as collaborative robots became widely utilized in many industrial fields. Among techniques for human-robot interaction, collision identification is an indispensable element in collaborative robo...

  • Article
  • Open Access
6 Citations
3,384 Views
17 Pages

8 October 2021

Vibration analysis is an active area of research, aimed, among other targets, at an accurate classification of machinery failure modes. The analysis often leads to complex and convoluted signal processing pipeline designs, which are computationally d...

  • Article
  • Open Access
5 Citations
3,460 Views
20 Pages

Design and Processing Method for Doppler-Tolerant Stepped-Frequency Waveform Using Staggered PRF

  • Yan Zhang,
  • Chunmao Yeh,
  • Zhangfeng Li,
  • Yaobing Lu and
  • Xuebin Chen

8 October 2021

Stepped-frequency waveform may be used to synthesize a wideband signal with several narrow-band pulses and achieve a high-resolution range profile without increasing the instantaneous bandwidth. Nevertheless, the conventional stepped-frequency wavefo...

  • Article
  • Open Access
27 Citations
5,134 Views
13 Pages

Corona Discharge Characteristics under Variable Frequency and Pressure Environments

  • Pau Bas-Calopa,
  • Jordi-Roger Riba and
  • Manuel Moreno-Eguilaz

8 October 2021

More electric aircrafts (MEAs) are paving the path to all electric aircrafts (AEAs), which make a much more intensive use of electrical power than conventional aircrafts. Due to the strict weight requirements, both MEA and AEA systems require to incr...

  • Article
  • Open Access
37 Citations
11,270 Views
18 Pages

Anomaly Detection of Water Level Using Deep Autoencoder

  • Isack Thomas Nicholaus,
  • Jun Ryeol Park,
  • Kyuil Jung,
  • Jun Seoung Lee and
  • Dae-Ki Kang

8 October 2021

Anomaly detection is one of the crucial tasks in daily infrastructure operations as it can prevent massive damage to devices or resources, which may then lead to catastrophic outcomes. To address this challenge, we propose an automated solution to de...

  • Communication
  • Open Access
7 Citations
3,464 Views
10 Pages

Elastic Properties Measurement Using Guided Acoustic Waves

  • Viktor Fairuschin,
  • Felix Brand,
  • Alexander Backer and
  • Klaus Stefan Drese

8 October 2021

Nondestructive evaluation of elastic properties plays a critical role in condition monitoring of thin structures such as sheets, plates or tubes. Recent research has shown that elastic properties of such structures can be determined with remarkable a...

  • Article
  • Open Access
12 Citations
4,004 Views
24 Pages

8 October 2021

In this paper, we propose a multi-view stereo matching method, EnSoft3D (Enhanced Soft 3D Reconstruction) to obtain dense and high-quality depth images. Multi-view stereo is one of the high-interest research areas and has wide applications. Motivated...

  • Article
  • Open Access
14 Citations
3,958 Views
13 Pages

8 October 2021

This research proposes a 3D internal visualization using ultrasonic pulse-echo tomography technique to evaluate accurately the state of concrete structures for their efficient maintenance within a limited budget. Synthetic aperture focusing technique...

  • Article
  • Open Access
4 Citations
2,882 Views
20 Pages

Investigation of Heterogeneity Sources for Occupational Task Recognition via Transfer Learning

  • Sahand Hajifar,
  • Saeb Ragani Lamooki,
  • Lora A. Cavuoto,
  • Fadel M. Megahed and
  • Hongyue Sun

8 October 2021

Human activity recognition has been extensively used for the classification of occupational tasks. Existing activity recognition approaches perform well when training and testing data follow an identical distribution. However, in the real world, this...

  • Communication
  • Open Access
5 Citations
4,623 Views
10 Pages

A Frequency-Programmable Miniaturized Radio Frequency Transmitter for Animal Tracking

  • Jun Lu,
  • Huidong Li,
  • Chuan Tian,
  • Mitchell J. Myjak,
  • Jie Xiao,
  • Brian J. Bellgraph,
  • Samuel S. Cartmell and
  • Zhiqun Daniel Deng

8 October 2021

In animal tracking applications, smaller transmitters can reduce the impact of the transmitter on the tagged animal and thus provide more accurate data about animal behavior. By combining a novel circuit design and a newly developed micro-battery, we...

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Sensors - ISSN 1424-8220