Results 11 to 20 of about 465,961 (285)

Photoacoustic methane detection inside a MEMS microphone

Photoacoustics, 2023
An innovative laser based photoacoustic (PA) gas sensing concept with intrinsic miniaturization potential was developed and investigated for methane trace gas detection.
Thomas Strahl, Jonas Steinebrunner, Christian Weber, Jürgen Wöllenstein, Katrin Schmitt   +4 more
doaj   +1 more source

Time-dependent investigation of a mechanochemical synthesis of bismuth telluride-based materials and their structural and thermoelectric properties

Royal Society Open Science, 2022
Here, we report on the time dependence of a synthesis procedure for generation of both n- and p-type bismuth telluride-based materials. To initiate the reaction, the starting materials were first mechanical pre-reacted.
Dennis Groeneveld, Jan D. Koenig, Michael Poschmann, Hendrik Groß, Wolfgang Bensch, Lorenz Kienle, Jürgen Wöllenstein   +6 more
doaj   +1 more source

A Review of Resistive Gas Sensors Based on Semiconducting Metal Oxides [PDF]

Journal of Advanced Materials in Engineering, 2022
Nowadays, the industrialization of societies and the improvement of the quality of life are associated with issues such as air pollution and environmental pollution.
A. Mirzaei, H. Shokrollahi
doaj   +1 more source

Low-Power Odor-Sensing Network Based on Wake-Up Nodes

Proceedings, 2017
The localization of bad odors is a long standing issue with high relevance for affected people because of the health and safety implications. In order to enable the detection and localization of bad odors we propose a wireless, low-power consuming sensor
Alvaro Ortiz Perez, Benedikt Bierer, Cem Dinc, Jürgen Wöllenstein, Stefan Palzer   +4 more
doaj   +1 more source

Selective gas detection using Mn3O4/WO3 composites as a sensing layer [PDF]

, 2019
Pure WO3 sensors and Mn3O4/WO3 composite sensors with different Mn concentrations (1 atom %, 3 atom % and 5 atom %) were successfully prepared through a facile hydrothermal method.
Chen, Lin, Hu, Jie, Li, Gang, Li, Pengwei, Sun, Yongjiao, Wang, Wenda, Yu, Zhichao, Zhang, Wendong, Zhuiykov, Serge   +8 more
core   +1 more source

Layer by Layer Deposition of Colloidal SnO2 Nano Particles

Proceedings, 2017
The gas sensing properties of functional metal oxide layers depend on multitude parameters, including vacancy concentration, layer morphology and thickness, size and shape of the nano/microstructure, and porosity.
Haitao Gao, Xuemeng Lyu, Jürgen Wöllenstein, Stefan Palzer   +3 more
doaj   +1 more source

Selective Sensing of Gas Mixture via a Temperature Modulation Approach: New Strategy for Potentiometric Gas Sensor Obtaining Satisfactory Discriminating Features

Sensors, 2017
A new strategy to discriminate four types of hazardous gases is proposed in this research. Through modulating the operating temperature and the processing response signal with a pattern recognition algorithm, a gas sensor consisting of a single sensing ...
Fu-an Li, Han Jin, Jinxia Wang, Jie Zou, Jiawen Jian   +4 more
doaj   +1 more source

A committee machine gas identification system based on dynamically reconfigurable FPGA [PDF]

, 2008
This paper proposes a gas identification system based on the committee machine (CM) classifier, which combines various gas identification algorithms, to obtain a unified decision with improved accuracy.
Amira, A, Bermak, A, Brahim-Belhouari, S, Chandrasekaran, S, Shi, M   +4 more
core   +2 more sources

A Wireless Gas Sensor Network to Monitor Indoor Environmental Quality in Schools

Sensors, 2018
Schools are amongst the most densely occupied indoor areas and at the same time children and young adults are the most vulnerable group with respect to adverse health effects as a result of poor environmental conditions.
Alvaro Ortiz Perez, Benedikt Bierer, Louisa Scholz, Jürgen Wöllenstein, Stefan Palzer   +4 more
doaj   +1 more source

Rapid Quantitative Analysis of IR Absorption Spectra for Trace Gas Detection by Artificial Neural Networks Trained with Synthetic Data

Sensors, 2022
Infrared absorption spectroscopy is a widely used tool to quantify and monitor compositions of gases. The concentration information is often retrieved by fitting absorption profiles to the acquired spectra, utilizing spectroscopic databases.
Jens Goldschmidt, Leonard Nitzsche, Sebastian Wolf, Armin Lambrecht, Jürgen Wöllenstein   +4 more
doaj   +1 more source