The document discusses gas sensors and how nanotechnology has influenced their development. It describes how gas sensors can detect harmful gases using various technologies like metal-oxide-semiconductor sensors. Nanotechnology has allowed these sensors to use nano-structured metal oxides, improving their speed, power needs, detection limits and ability to operate at lower temperatures in a more economical way. The document outlines the working principles and applications of gas sensors.
Carbon Nanotubes Based Sensor for Detection of Traces of Gas Molecules- A ReviewIJEEE
In this review paper, we discuss various gas sensors based on technique and sensing materials used in there fabrication. Various sensors are designed making use of salient features of carbon nanotubes and its electrical, mechanical, and electromechanical properties. Effect of using nano-composites on sensitivity and selectivity of gas sensor have been studied.
SIMULATION OF MEMS MICROHOTPLATE FOR METAL OXIDE GAS SENSORS: REVIEWIJEEE
Simulation of gas sensor with integrated micro hotplate (MHP) of ultra low power consumption is reviewed. Various parameters of gas sensor and MHP as power, temperature ,heat insulation ,stress analysis and deflection is studied using various Multiphysics simulation tools like ANSYS and Conventorware
Detection Methods:
There are five types of detection methods which are as:
Catalytic oxidation detectors
Electrochemical detectors
Optical detectors
Electrical conductivity (semiconductors) detectors
Chemical adsorbents detectors.
Carbon Nanotubes Based Sensor for Detection of Traces of Gas Molecules- A ReviewIJEEE
In this review paper, we discuss various gas sensors based on technique and sensing materials used in there fabrication. Various sensors are designed making use of salient features of carbon nanotubes and its electrical, mechanical, and electromechanical properties. Effect of using nano-composites on sensitivity and selectivity of gas sensor have been studied.
SIMULATION OF MEMS MICROHOTPLATE FOR METAL OXIDE GAS SENSORS: REVIEWIJEEE
Simulation of gas sensor with integrated micro hotplate (MHP) of ultra low power consumption is reviewed. Various parameters of gas sensor and MHP as power, temperature ,heat insulation ,stress analysis and deflection is studied using various Multiphysics simulation tools like ANSYS and Conventorware
Detection Methods:
There are five types of detection methods which are as:
Catalytic oxidation detectors
Electrochemical detectors
Optical detectors
Electrical conductivity (semiconductors) detectors
Chemical adsorbents detectors.
Gas Sensors Types - Detection Of Different Types Of GasesVacker1
Different Gas Sensors types are widely used in various industries, including healthcare, automotive, and aerospace, to monitor and control the levels of toxic or combustible gases. Gas sensors are devices that are used to detect and measure the concentration of gases in the air.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Method for determining exhaustion of an electrochemical gas sensorSherry Huang
A method by which an oxygen measuring instrument can test the functionality of the oxygen sensor. Oxygen sensors of the galvanic type operate by consumption of an internal easily oxidizable anode, such as lead or cadmium.
The electronic noses are being developed in order to mimic human olfaction that functions as a non-separative mechanism: i.e. an odor / flavor is perceived as a global fingerprint. An electronic nose (e-nose) is a device that identifies the specific components of an odour and analyzes its chemical makeup to identify it.Over the last decade, "electronic sensing" or "e-sensing" technologies have undergone important developments from a technical and commercial point of view. The "electronic nose" is a relatively new tool that may be used for safety, quality, or process monitoring, accomplishing in a few minutes procedures that may presently require days to complete. It can be regarded as a modular system comprising a set of active materials which detect the odour, associated sensors which transduce the chemical quantity into electrical signals, followed by appropriate signal conditioning and processing to classify known odours or identify unknown odours. E-nose finds application in industrial processes, environmental toxins and pollutants, space stations & space shuttle air quality, medicines body function, food processing, military environment and toxicology. Electronic noses have provided a plethora of benefits to a variety of commercial industries, including the agricultural, biomedical, cosmetics, environmental, food, manufacturing, military, pharmaceutical, regulatory, and various scientific research fields.
Artificial Reefs by Kuddle Life Foundation - May 2024punit537210
Situated in Pondicherry, India, Kuddle Life Foundation is a charitable, non-profit and non-governmental organization (NGO) dedicated to improving the living standards of coastal communities and simultaneously placing a strong emphasis on the protection of marine ecosystems.
One of the key areas we work in is Artificial Reefs. This presentation captures our journey so far and our learnings. We hope you get as excited about marine conservation and artificial reefs as we are.
Please visit our website: https://kuddlelife.org
Our Instagram channel:
@kuddlelifefoundation
Our Linkedin Page:
https://www.linkedin.com/company/kuddlelifefoundation/
and write to us if you have any questions:
info@kuddlelife.org
Gas Sensors Types - Detection Of Different Types Of GasesVacker1
Different Gas Sensors types are widely used in various industries, including healthcare, automotive, and aerospace, to monitor and control the levels of toxic or combustible gases. Gas sensors are devices that are used to detect and measure the concentration of gases in the air.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Method for determining exhaustion of an electrochemical gas sensorSherry Huang
A method by which an oxygen measuring instrument can test the functionality of the oxygen sensor. Oxygen sensors of the galvanic type operate by consumption of an internal easily oxidizable anode, such as lead or cadmium.
The electronic noses are being developed in order to mimic human olfaction that functions as a non-separative mechanism: i.e. an odor / flavor is perceived as a global fingerprint. An electronic nose (e-nose) is a device that identifies the specific components of an odour and analyzes its chemical makeup to identify it.Over the last decade, "electronic sensing" or "e-sensing" technologies have undergone important developments from a technical and commercial point of view. The "electronic nose" is a relatively new tool that may be used for safety, quality, or process monitoring, accomplishing in a few minutes procedures that may presently require days to complete. It can be regarded as a modular system comprising a set of active materials which detect the odour, associated sensors which transduce the chemical quantity into electrical signals, followed by appropriate signal conditioning and processing to classify known odours or identify unknown odours. E-nose finds application in industrial processes, environmental toxins and pollutants, space stations & space shuttle air quality, medicines body function, food processing, military environment and toxicology. Electronic noses have provided a plethora of benefits to a variety of commercial industries, including the agricultural, biomedical, cosmetics, environmental, food, manufacturing, military, pharmaceutical, regulatory, and various scientific research fields.
Artificial Reefs by Kuddle Life Foundation - May 2024punit537210
Situated in Pondicherry, India, Kuddle Life Foundation is a charitable, non-profit and non-governmental organization (NGO) dedicated to improving the living standards of coastal communities and simultaneously placing a strong emphasis on the protection of marine ecosystems.
One of the key areas we work in is Artificial Reefs. This presentation captures our journey so far and our learnings. We hope you get as excited about marine conservation and artificial reefs as we are.
Please visit our website: https://kuddlelife.org
Our Instagram channel:
@kuddlelifefoundation
Our Linkedin Page:
https://www.linkedin.com/company/kuddlelifefoundation/
and write to us if you have any questions:
info@kuddlelife.org
UNDERSTANDING WHAT GREEN WASHING IS!.pdfJulietMogola
Many companies today use green washing to lure the public into thinking they are conserving the environment but in real sense they are doing more harm. There have been such several cases from very big companies here in Kenya and also globally. This ranges from various sectors from manufacturing and goes to consumer products. Educating people on greenwashing will enable people to make better choices based on their analysis and not on what they see on marketing sites.
"Understanding the Carbon Cycle: Processes, Human Impacts, and Strategies for...MMariSelvam4
The carbon cycle is a critical component of Earth's environmental system, governing the movement and transformation of carbon through various reservoirs, including the atmosphere, oceans, soil, and living organisms. This complex cycle involves several key processes such as photosynthesis, respiration, decomposition, and carbon sequestration, each contributing to the regulation of carbon levels on the planet.
Human activities, particularly fossil fuel combustion and deforestation, have significantly altered the natural carbon cycle, leading to increased atmospheric carbon dioxide concentrations and driving climate change. Understanding the intricacies of the carbon cycle is essential for assessing the impacts of these changes and developing effective mitigation strategies.
By studying the carbon cycle, scientists can identify carbon sources and sinks, measure carbon fluxes, and predict future trends. This knowledge is crucial for crafting policies aimed at reducing carbon emissions, enhancing carbon storage, and promoting sustainable practices. The carbon cycle's interplay with climate systems, ecosystems, and human activities underscores its importance in maintaining a stable and healthy planet.
In-depth exploration of the carbon cycle reveals the delicate balance required to sustain life and the urgent need to address anthropogenic influences. Through research, education, and policy, we can work towards restoring equilibrium in the carbon cycle and ensuring a sustainable future for generations to come.
WRI’s brand new “Food Service Playbook for Promoting Sustainable Food Choices” gives food service operators the very latest strategies for creating dining environments that empower consumers to choose sustainable, plant-rich dishes. This research builds off our first guide for food service, now with industry experience and insights from nearly 350 academic trials.
Natural farming @ Dr. Siddhartha S. Jena.pptxsidjena70
A brief about organic farming/ Natural farming/ Zero budget natural farming/ Subash Palekar Natural farming which keeps us and environment safe and healthy. Next gen Agricultural practices of chemical free farming.
Characterization and the Kinetics of drying at the drying oven and with micro...Open Access Research Paper
The objective of this work is to contribute to valorization de Nephelium lappaceum by the characterization of kinetics of drying of seeds of Nephelium lappaceum. The seeds were dehydrated until a constant mass respectively in a drying oven and a microwawe oven. The temperatures and the powers of drying are respectively: 50, 60 and 70°C and 140, 280 and 420 W. The results show that the curves of drying of seeds of Nephelium lappaceum do not present a phase of constant kinetics. The coefficients of diffusion vary between 2.09.10-8 to 2.98. 10-8m-2/s in the interval of 50°C at 70°C and between 4.83×10-07 at 9.04×10-07 m-8/s for the powers going of 140 W with 420 W the relation between Arrhenius and a value of energy of activation of 16.49 kJ. mol-1 expressed the effect of the temperature on effective diffusivity.
2. Introduction
A gas sensor is a device that detects the presence of gases in an area, often as part of a safety
system.
This type of device is important because there are many gases that can be harmful to organic
life, such as humans or animals.
It can be used to detect combustible, flammable and toxic gases, and oxygen depletion.( Gases:
CO, Nox ,Sox ,CO2 ,NH4 ,CH4 ..etc,.)
Common sensors includes:
1. Combustible gas sensors,
2. photoionization detectors,
3. infrared point sensors,
4. ultrasonic sensors,
5. Electrochemical gas sensors, and
6. metal-oxide-semiconductor sensors (MOS sensors).
3. Influence of nanotechnology is mostly seen in nano-structured metal
oxide semiconductors(MOS’s)
These are mostly N-type Semiconductors.
They can operate around 300-600°C.
MOS Gas sensors contains two segments of instrumentations
1. Sensing film.
2. Miniature heater elements.
CLASSIFICATION OF SENSORS
GAS SENSORS
Detection mechanism Materials used
(voltage, adsorption, (MOS’s ,pt & pd, oxide film thickness,
Absorption, current.,etc,.) grain size ,porosity, material sintering temperature and time )
4. WORKING PRINCIPLE :
They work on the basic principles such as
Adsorption, Desorption, Absorption, Evaporation,etc,.
5.
6.
7. • In clean air, donor electrons in tin dioxide are attracted toward oxygen which is adsorbed on
the surface of the sensing material, preventing electric current flow.
• In the presence of reducing gases, the surface density of adsorbed oxygen decreases as it
reacts with the reducing gases. Electrons are then released into the tin dioxide, allowing
current to flow freely through the sensor. The current flow will give the equivalent readings
of the measured gas.
9. ADVANTAGES OF USING NANO SIZED GAS SENSORS ELEMENTS:
Potentially faster
Requires low power
Comes with lower limit of detection
Operates even at low temperatures
More heat shock resistant
Economically low in cost
APPLICATIONS:
Analysis of organic vapours
Breath analysis for traffic safety
Disease diagnosis
Testing smell ,taste of food ,perfumes etc
