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Sensors, Volume 20, Issue 23

December-1 2020 - 295 articles

Cover Story: Conventional mechanical Fourier transform spectrometers (FTSs) measure absorption and dispersion spectra of gas-phase samples with very long measurement times to obtain time-resolved spectra with a good spectral resolution. Here, we present a mid-infrared dual-comb-based FTS providing broadband absorption and dispersion spectra with a spectral resolution of 5 GHz, a temporal resolution of 20 μs, and a wavelength coverage of 300 cm−1 in a measurement time of a few minutes. The spectrometer is used to monitor the reaction dynamics of methane and ethane in an electrical plasma discharge in dynamic conditions. The results demonstrate a new analytical approach for measuring rapid molecular changes in chemical reactions. This approach is interesting for chemical kinetic research, in particular for the combustion and plasma analysis community. View this paper
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Articles (295)

  • Letter
  • Open Access
30 Citations
5,018 Views
12 Pages

7 December 2020

During the processing and planting of soybeans, it is greatly significant that a reliable, rapid, and accurate technique is used to detect soybean varieties. Traditional chemical analysis methods of soybean variety sampling (e.g., mass spectrometry a...

  • Letter
  • Open Access
4 Citations
3,324 Views
11 Pages

Optimization of Cost-Effective and Reproducible Flexible Humidity Sensors Based on Metal-Organic Frameworks

  • Victor Toral,
  • Florin C. Loghin,
  • Antonio Rodríguez-Diéguez,
  • Alejandro Lapresta-Fernández,
  • Diego P. Morales,
  • Almudena Rivadeneyra and
  • Alfonso Salinas-Castillo

7 December 2020

In this letter, we present the extension of a previous work on a cost-effective method for fabricating highly sensitive humidity sensors on flexible substrates with a reversible response, allowing precise monitoring of the humidity threshold. In that...

  • Review
  • Open Access
29 Citations
8,360 Views
42 Pages

QCM Sensor Arrays, Electroanalytical Techniques and NIR Spectroscopy Coupled to Multivariate Analysis for Quality Assessment of Food Products, Raw Materials, Ingredients and Foodborne Pathogen Detection: Challenges and Breakthroughs

  • David K. Bwambok,
  • Noureen Siraj,
  • Samantha Macchi,
  • Nathaniel E. Larm,
  • Gary A. Baker,
  • Rocío L. Pérez,
  • Caitlan E. Ayala,
  • Charuksha Walgama,
  • David Pollard and
  • Jason D. Rodriguez
  • + 4 authors

7 December 2020

Quality checks, assessments, and the assurance of food products, raw materials, and food ingredients is critically important to ensure the safeguard of foods of high quality for safety and public health. Nevertheless, quality checks, assessments, and...

  • Letter
  • Open Access
13 Citations
4,158 Views
12 Pages

Identifying Fatigue Indicators Using Gait Variability Measures: A Longitudinal Study on Elderly Brisk Walking

  • Guoxin Zhang,
  • Ivy Kwan-Kei Wong,
  • Tony Lin-Wei Chen,
  • Tommy Tung-Ho Hong,
  • Duo Wai-Chi Wong,
  • Yinghu Peng,
  • Fei Yan,
  • Yan Wang,
  • Qitao Tan and
  • Ming Zhang

7 December 2020

Real-time detection of fatigue in the elderly during physical exercises can help identify the stability and thus falling risks which are commonly achieved by the investigation of kinematic parameters. In this study, we aimed to identify the change in...

  • Article
  • Open Access
10 Citations
3,481 Views
19 Pages

7 December 2020

Smartphone-sensors-based human activity recognition is attracting increasing interest due to the popularization of smartphones. It is a difficult long-range temporal recognition problem, especially with large intraclass distances such as carrying sma...

  • Review
  • Open Access
49 Citations
10,570 Views
20 Pages

7 December 2020

When multiple robots are involved in the process of simultaneous localization and mapping (SLAM), a global map should be constructed by merging the local maps built by individual robots, so as to provide a better representation of the environment. He...

  • Article
  • Open Access
1 Citations
3,659 Views
15 Pages

Design of a Planar Array of Low Profile Horns at 28 GHz

  • Jou-Yi Wang,
  • Malcolm Ng Mou Kehn and
  • Eva Rajo-Iglesias

7 December 2020

A planar array of low profile horns fed by a transverse slotted waveguide array in the low millimeter-wave regime (28 GHz) is presented. The array of transverse slots cannot be directly used as antenna as it has grating lobes due to the fact that slo...

  • Article
  • Open Access
9 Citations
5,583 Views
36 Pages

Biomedical Signal Acquisition Using Sensors under the Paradigm of Parallel Computing

  • Jesús Jaime Moreno Escobar,
  • Oswaldo Morales Matamoros,
  • Ricardo Tejeida Padilla,
  • Liliana Chanona Hernández,
  • Juan Pablo Francisco Posadas Durán,
  • Ana Karen Pérez Martínez,
  • Ixchel Lina Reyes and
  • Hugo Quintana Espinosa

7 December 2020

There are several pathologies attacking the central nervous system and diverse therapies for each specific disease. These therapies seek as far as possible to minimize or offset the consequences caused by these types of pathologies and disorders in t...

  • Article
  • Open Access
44 Citations
7,820 Views
17 Pages

7 December 2020

Human Activity Recognition (HAR) using embedded sensors in smartphones and smartwatch has gained popularity in extensive applications in health care monitoring of elderly people, security purpose, robotics, monitoring employees in the industry, and o...

  • Letter
  • Open Access
3 Citations
3,556 Views
14 Pages

Low-Temperature Properties of the Magnetic Sensor with Amorphous Wire

  • Dongfeng He,
  • Kensei Umemori,
  • Ryuichi Ueki,
  • Takeshi Dohmae,
  • Takafumi Okada,
  • Minoru Tachiki,
  • Shuuichi Ooi and
  • Makoto Watanabe

7 December 2020

We found that a magnetic sensor made of a coil wound around a 5 f0.1 mm (Fe0.06Co0.94)72.5Si2.5B15 (FeCoSiB) amorphous wire could operate in a wide temperature range from room temperature to liquid helium temperature (4.2 K). The low-temperature sens...

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Sensors - ISSN 1424-8220