Performance Test of Gas Sensors Measuring Air Pollutants of NO, NO2, SO2, CO and VOC

2021 ◽  
Vol 21 (1) ◽  
pp. 13-20
Author(s):  
Chunsang Lee ◽  
◽  
Kyoungchan Kim ◽  
Sangwoo Han ◽  
Hungsoo Joo ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Air Pollutants ◽  
Performance Test

Metal Oxides Semiconductor Sensors for Odor Classification

2017 ◽  
Vol 6 (3) ◽  
pp. 133
Author(s):  
Nyayu Latifah Husni ◽  
Ade Silvia ◽  
Siti Nurmaini ◽  
Irsyadi Yani
Keyword(s):  
Metal Oxides ◽  
Gas Sensors ◽  
Experimental Test ◽  
Sampling Method ◽  
Performance Test ◽  
Dynamic Experiment ◽  
Semiconductor Sensor ◽  
Surrounding Environment ◽  
Expected Outcome ◽  
Odor Classification

<span>The performance of gas sensor will differ and vary due to the surrounding environment changing, the way of implementation, and the position of the sensors to the source. To reach a good result on gas sensors implementation, a performance test on sensors is needed. The results of the tests are useful for characterizing the properties of the particular material or device. This paper discusses the performances of metal oxides semiconductor (MOS) sensors. The sensors are tested to determine the sensors' time response, sensors' peak duration, sensors' sensitivity, and sensors' stability of the sensor when applied to the various sources at different range. Three sources were used in experimental test, namely: ethanol, methanol, and acetone. The gas sensors characteristics are analyzed in open sampling method in order to see the sensors' sensitivity to the uncertainty disturbances, such as wind. The result shows that metal oxides semiconductor sensor was responsive to the 3 sources not only in static but also dynamic conditions. The expected outcome of this study is to predict the MOS sensors' performance when they are applied in robotic implementation. This performance was considered as the training datasets of the sensor for odor classification in this research. From the experiments, It was got, in dynamic experiment, the senrors has average of precision of 93.8-97%, the accuracy 93.3-96.7%, and the recall 93.3-96.7%. This values indicates that the sensors were selective to the odor they sensed.</span>

scholarly journals Air Quality Measurements and Education: Improving Environmental Awareness of High School Students

2021 ◽  
Vol 2 ◽  
Author(s):  
Sebastian Höfner ◽  
Andreas Schütze
Keyword(s):  
High School Students ◽  
Air Quality ◽  
Gas Sensors ◽  
Indoor Air ◽  
Air Pollutants ◽  
Public Awareness ◽  
Environmental Awareness ◽  
Oxide Semiconductor ◽  
Quality Data ◽  
Measurement Results

Indoor air quality (IAQ) has gained renewed importance in public awareness, especially in times of the corona pandemic. In classrooms in particular, regular ventilation is essential to keep the potential viral load in the air as low as possible and thus reduce the likelihood of infection with the corona virus. But also the concentration of other pollutants, such as particulate matter (PM) or volatile organic compounds (VOCs), which are responsible for symptoms such as concentration disorders, headaches and dizziness can be reduced. In addition to the direct measurement of VOC pollutants using metal oxide semiconductor (MOS) gas sensors, CO2 is also measured as an indicator gas for monitoring IAQ. However, young people in particular have only a diffuse idea of air pollutants. This can be explained by the fact that many of these air pollutants are both odorless and colorless and are only detectable using suitable sensors. In order to provide students with a comprehensive picture of the topic of air quality and thus strengthen their environmental awareness, declarative, conceptual and procedural knowledge needs to be combined. This includes knowledge about different sensor principles, pollutant types, their limits, health effects on humans and strategies to maintain good air quality, both indoors and outdoors. To ensure that this knowledge does not remain inert, authentic learning scenarios with a direct relevance to everyday life must be provided. Measuring pollutants in indoor air in particular offers the opportunity to apply what has been learned in a context-oriented manner. By linking the performance of measurements with sensors and the subsequent interpretation of measurement results, environmental awareness can be sharpened with regard to IAQ. This can be achieved by measuring pollutants with sensors and then interpreting and classifying the measurement results. In this paper, various student experiments with gas sensors are presented that introduce the function principles of different sensor types, record air quality data and provide meaningful interpretation. Based on these experiences, students are encouraged to develop their own research questions on air quality.

Exploring two-dimensional M2NS2 (M = Ti, V) MXenes based gas sensors for air pollutants

2020 ◽  
Vol 19 ◽  
pp. 100574 ◽  
Author(s):  
Syeda Rabab Naqvi ◽  
Vivekanand Shukla ◽  
Naresh Kumar Jena ◽  
Wei Luo ◽  
Rajeev Ahuja
Keyword(s):  
Gas Sensors ◽  
Air Pollutants ◽  
Two Dimensional

Narrowing Algorithm for Indoor-Air Pollutants using Gas Sensor Patterns

1999 ◽  
Vol 3 (6) ◽  
pp. 519-523
Author(s):  
Takashi Oyabu ◽  
◽  
Takeshi Onodera ◽  
Hidetaka Nambo ◽  
Haruhiko Kimura ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Gas Sensors ◽  
Indoor Air ◽  
Tin Oxide ◽  
Air Pollutants ◽  
High Reliability ◽  
Gas Mixture ◽  
Domestic Environment ◽  
Sick House Syndrome ◽  
Indoor Air Pollutants

There are many types of gaseous indoor-air pollutants in the domestic environment, generally mixtures of several gases. These gases harm people in houses with sick house syndrome. It is important to identify pollutants and their grades. We narrow many possible pollutants to two or three using output patterns of plural tin-oxide gas sensors. Six types of sensors are used in the system. The algorithm to identify the mixture of gas is made using the characteristics of sensor patterns and has high reliability, especially in detecting alcoholic gas, carbon dioxide, and carbon monoxide gases. It consists of several general steps and sensitivity grade of each sensor in a gas mixture is important to identify polluting gases. In practice, OPS5, an expert system, is used to narrow the types of gas.

scholarly journals Development of NOx Emission and Electrochemical Detection in Atmosphere

2016 ◽  
Author(s):  
Yu Du ◽  
Xixiang Sun ◽  
Qin Wei
Keyword(s):  
Greenhouse Gas ◽  
Electrochemical Detection ◽  
Gas Sensors ◽  
Air Pollutants ◽  
Electrochemical Analysis ◽  
Nox Emission ◽  
Analysis Methods ◽  
Nox Sensor

Reactive NOx is one of the major air pollutants, which also plays a key role as greenhouse gas. Many research efforts have been devoted to not only detection of NOx in air but also abatement of NOx emission. The aim of this mini review is to provide a panoramic snapshot of the electrochemical analysis methods for the emission and detection of NOx in atmosphere, with special emphasis on NOx sensor. The electrochemical detecting mechanism and materials for fabricating electrochemical gas sensors are discussed and the prospects and challenges in this area are also evaluated. This work will serve as a useful source to inform the interested audience of the latest developments and applications in the field of NOx emission and electrochemical detection.

scholarly journals Outputs of Plural Tin Oxide Gas Sensors for Compound Gaseous Indoor-air Pollutants

1998 ◽  
Vol 118 (12) ◽  
pp. 572-577 ◽  
Author(s):  
Takashi Oyabu ◽  
Takeshi Onodera ◽  
Shigeki Hirobayashi ◽  
Haruhiko Kimura
Keyword(s):  
Gas Sensors ◽  
Indoor Air ◽  
Tin Oxide ◽  
Air Pollutants ◽  
Indoor Air Pollutants

scholarly journals The Heterostructures of CuO and SnOx for NO2 Detection

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4387
Author(s):  
Anna Paleczek ◽  
Bartłomiej Szafraniak ◽  
Łukasz Fuśnik ◽  
Andrzej Brudnik ◽  
Dominik Grochala ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Air Pollutants ◽  
Operating Temperature ◽  
Pollution Level ◽  
Electrical Behavior ◽  
Wide Range ◽  
Real Time Information ◽  
Time Information ◽  
Lower Operating Temperature ◽  
No2 Detection

Controlling environmental pollution is a burning problem for all countries more than ever. Currently, due to the increasing industrialization, the number of days when the limits of air pollutants are over the threshold levels exceeds 80–85% of the year. Therefore, cheap and effective sensors are always welcome. One idea is to combine such solutions with cars and provide real-time information about the current pollution level. However, the environmental conditions are demanding, and thus the developed sensors need to be characterized by the high 3S parameters: sensitivity, stability and selectivity. In this paper, we present the results on the heterostructure of CuO/SnOx and SnOx/CuO as a possible approach for selective NO2 detection. The developed gas sensors exhibited lower operating temperature and high response in the wide range of NO2 and in a wide range of relative humidity changes. Material characterizations and impedance spectroscopy measurements were also conducted to analyze the chemical and electrical behavior.

Some Effects of Oxidant Air Pollutants (Ozone and Peroxyacetyl Nitrate) on the Ultrastructure of Leaf Tissues

1972 ◽  
Vol 30 ◽  
pp. 360-361
Author(s):  
William W. Thomson ◽  
Elizabeth S. Swanson
Keyword(s):  
Air Pollutants ◽  
Electron Microscopic Examination ◽  
Peroxyacetyl Nitrate ◽  
Electron Microscopic ◽  
Growth Physiology ◽  
Physiology And Biochemistry ◽  
Entire Plant ◽  
Leaf Tissues ◽  
Gaseous Hydrocarbons ◽  
The Individual

The oxidant air pollutants, ozone and peroxyacetyl nitrate, are produced in the atmosphere through the interaction of light with nitrogen oxides and gaseous hydrocarbons. These oxidants are phytotoxicants and are known to deleteriously affect plant growth, physiology, and biochemistry. In many instances they induce changes which lead to the death of cells, tissues, organs, and frequently the entire plant. The most obvious damage and biochemical changes are generally observed with leaves.Electron microscopic examination of leaves from bean (Phaseolus vulgaris L.) tobacco (Nicotiana tabacum L.) and cotton (Gossipyum hirsutum L.) fumigated for .5 to 2 hours with 0.3 -1 ppm of the individual oxidants revealed that changes in the ultrastructure of the cells occurred in a sequential fashion with time following the fumigation period. Although occasional cells showed severe damage immediately after fumigation, the most obvious change was an enhanced clarity of the cell membranes.

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