This paper reports a plasma reactive oxygen species (ROS) method for decontamination of PPE (N95 ... more This paper reports a plasma reactive oxygen species (ROS) method for decontamination of PPE (N95 respirators and gowns) using a surface DBD source to meet the increased need of PPE due to the COVID-19 pandemic. A system is presented consisting of a mobile trailer (35 m3) along with several Dielectric barrier discharge sources installed for generating a plasma ROS level to achieve viral decontamination. The plasma ROS treated respirators were evaluated at the CDC NPPTL, and additional PPE specimens and material functionality testing were performed at Texas A&M. The effects of decontamination on the performance of respirators were tested using a modified version of the NIOSH Standard Test Procedure TEB-APR-STP-0059 to determine particulate filtration efficiency. The treated Prestige Ameritech and BYD brand N95 respirators show filtration efficiencies greater than 95% and maintain their integrity. The overall mechanical and functionality tests for plasma ROS treated PPE show no signifi...
The major applications of compact plasma in industry are (a) generation of high current ion beams... more The major applications of compact plasma in industry are (a) generation of high current ion beams for material surface treatment/cleaning/activation, (b) inner surface processing of narrow dimensional tubes, etc. These plasma techniques have also become a reliable tool to provide stronger bond, a cleaner surface for manufacturing and defect free components. These applications require controlled plasma generation with real time monitoring and noninvasive character of CT techniques allows imaging of the plasma radiation emissivity pattern. In this context, a compact emission CT system for microwave induced plasma source has been developed. The present work focuses on the performance evaluation of this system using Convolution back projection algorithm and error theorem. This system consists mainly an eight pin-hole camera at 45-degree angle view. Cross sectional images are obtained for plasma emissions inside the cylindrical tube. Sobolev space based error analysis Kanpur Theorem-1 is...
Moisture content is an important component in food products. Proper information about the moistur... more Moisture content is an important component in food products. Proper information about the moisture quantity in the grains is a valuable parameter to evaluate the quality and stability of the food products. Now a days Tomographic image processing plays an important role to monitor and ensure the quality of food products [1]. Present work focuses on use of Computerized tomography for the estimation of moisture content in pulses. Three different types of pulses (Arhar, Masoor, and Urad) are scanned by a micro X-ray CT scanner installed at IIT Kanpur. Thease experiments are carried out with 800 projection views and 120 kV applied voltage to Xray source. The 2-d detector system consists of photodiodes which generate 1024 data rays [2-3]. Avizo sofware which uses FDK (Feldkamp-Davis-Kress) alogorithm has been used here to reconstruct the CT images [45].
A new non-invasive diagnostic system is developed for Microwave Induced Plasma (MIP) to reconstru... more A new non-invasive diagnostic system is developed for Microwave Induced Plasma (MIP) to reconstruct tomographic images of a 2D emission profile. A compact MIP system has wide application in industry as well as research application such as thrusters for space propulsion, high current ion beams, and creation of negative ions for heating of fusion plasma. Emission profile depends on two crucial parameters, namely, the electron temperature and density (over the entire spatial extent) of the plasma system. Emission tomography provides basic understanding of plasmas and it is very useful to monitor internal structure of plasma phenomena without disturbing its actual processes. This paper presents development of a compact, modular, and versatile Optical Emission Tomography (OET) tool for a cylindrical, magnetically confined MIP system. It has eight slit-hole cameras and each consisting of a complementary metal-oxide-semiconductor linear image sensor for light detection. The optical noise i...
A new non-invasive diagnostic system is developed for Microwave Induced Plasma (MIP) to reconstru... more A new non-invasive diagnostic system is developed for Microwave Induced Plasma (MIP) to reconstruct tomographic images of a 2D emission profile. A compact MIP system has wide application in industry as well as research application such as thrusters for space propulsion, high current ion beams, and creation of negative ions for heating of fusion plasma. Emission profile depends on two crucial parameters, namely, the electron temperature and density (over the entire spatial extent) of the plasma system. Emission tomography provides basic understanding of plasmas and it is very useful to monitor internal structure of plasma phenomena without disturbing its actual processes. This paper presents development of a compact, modular, and versatile Optical Emission Tomography (OET) tool for a cylindrical, magnetically confined MIP system. It has eight slit-hole cameras and each consisting of a complementary metal-oxide-semiconductor linear image sensor for light detection. The optical noise is reduced by using aspheric lens and interference band-pass filters in each camera. The entire cylindrical plasma can be scanned with automated sliding ring mechanism arranged in fan-beam data collection geometry. The design of the camera includes a unique possibility to incorporate different filters to get the particular wavelength light from the plasma. This OET system includes selected band-pass filters for particular argon emission 750 nm, 772 nm, and 811 nm lines and hydrogen emission H(α) (656 nm) and H(β) (486 nm) lines. Convolution back projection algorithm is used to obtain the tomographic images of plasma emission line. The paper mainly focuses on (a) design of OET system in detail and (b) study of emission profile for 750 nm argon emission lines to validate the system design.
This paper reports a plasma reactive oxygen species (ROS) method for decontamination of PPE (N95 ... more This paper reports a plasma reactive oxygen species (ROS) method for decontamination of PPE (N95 respirators and gowns) using a surface DBD source to meet the increased need of PPE due to the COVID-19 pandemic. A system is presented consisting of a mobile trailer (35 m3) along with several Dielectric barrier discharge sources installed for generating a plasma ROS level to achieve viral decontamination. The plasma ROS treated respirators were evaluated at the CDC NPPTL, and additional PPE specimens and material functionality testing were performed at Texas A&M. The effects of decontamination on the performance of respirators were tested using a modified version of the NIOSH Standard Test Procedure TEB-APR-STP-0059 to determine particulate filtration efficiency. The treated Prestige Ameritech and BYD brand N95 respirators show filtration efficiencies greater than 95% and maintain their integrity. The overall mechanical and functionality tests for plasma ROS treated PPE show no signifi...
The major applications of compact plasma in industry are (a) generation of high current ion beams... more The major applications of compact plasma in industry are (a) generation of high current ion beams for material surface treatment/cleaning/activation, (b) inner surface processing of narrow dimensional tubes, etc. These plasma techniques have also become a reliable tool to provide stronger bond, a cleaner surface for manufacturing and defect free components. These applications require controlled plasma generation with real time monitoring and noninvasive character of CT techniques allows imaging of the plasma radiation emissivity pattern. In this context, a compact emission CT system for microwave induced plasma source has been developed. The present work focuses on the performance evaluation of this system using Convolution back projection algorithm and error theorem. This system consists mainly an eight pin-hole camera at 45-degree angle view. Cross sectional images are obtained for plasma emissions inside the cylindrical tube. Sobolev space based error analysis Kanpur Theorem-1 is...
Moisture content is an important component in food products. Proper information about the moistur... more Moisture content is an important component in food products. Proper information about the moisture quantity in the grains is a valuable parameter to evaluate the quality and stability of the food products. Now a days Tomographic image processing plays an important role to monitor and ensure the quality of food products [1]. Present work focuses on use of Computerized tomography for the estimation of moisture content in pulses. Three different types of pulses (Arhar, Masoor, and Urad) are scanned by a micro X-ray CT scanner installed at IIT Kanpur. Thease experiments are carried out with 800 projection views and 120 kV applied voltage to Xray source. The 2-d detector system consists of photodiodes which generate 1024 data rays [2-3]. Avizo sofware which uses FDK (Feldkamp-Davis-Kress) alogorithm has been used here to reconstruct the CT images [45].
A new non-invasive diagnostic system is developed for Microwave Induced Plasma (MIP) to reconstru... more A new non-invasive diagnostic system is developed for Microwave Induced Plasma (MIP) to reconstruct tomographic images of a 2D emission profile. A compact MIP system has wide application in industry as well as research application such as thrusters for space propulsion, high current ion beams, and creation of negative ions for heating of fusion plasma. Emission profile depends on two crucial parameters, namely, the electron temperature and density (over the entire spatial extent) of the plasma system. Emission tomography provides basic understanding of plasmas and it is very useful to monitor internal structure of plasma phenomena without disturbing its actual processes. This paper presents development of a compact, modular, and versatile Optical Emission Tomography (OET) tool for a cylindrical, magnetically confined MIP system. It has eight slit-hole cameras and each consisting of a complementary metal-oxide-semiconductor linear image sensor for light detection. The optical noise i...
A new non-invasive diagnostic system is developed for Microwave Induced Plasma (MIP) to reconstru... more A new non-invasive diagnostic system is developed for Microwave Induced Plasma (MIP) to reconstruct tomographic images of a 2D emission profile. A compact MIP system has wide application in industry as well as research application such as thrusters for space propulsion, high current ion beams, and creation of negative ions for heating of fusion plasma. Emission profile depends on two crucial parameters, namely, the electron temperature and density (over the entire spatial extent) of the plasma system. Emission tomography provides basic understanding of plasmas and it is very useful to monitor internal structure of plasma phenomena without disturbing its actual processes. This paper presents development of a compact, modular, and versatile Optical Emission Tomography (OET) tool for a cylindrical, magnetically confined MIP system. It has eight slit-hole cameras and each consisting of a complementary metal-oxide-semiconductor linear image sensor for light detection. The optical noise is reduced by using aspheric lens and interference band-pass filters in each camera. The entire cylindrical plasma can be scanned with automated sliding ring mechanism arranged in fan-beam data collection geometry. The design of the camera includes a unique possibility to incorporate different filters to get the particular wavelength light from the plasma. This OET system includes selected band-pass filters for particular argon emission 750 nm, 772 nm, and 811 nm lines and hydrogen emission H(α) (656 nm) and H(β) (486 nm) lines. Convolution back projection algorithm is used to obtain the tomographic images of plasma emission line. The paper mainly focuses on (a) design of OET system in detail and (b) study of emission profile for 750 nm argon emission lines to validate the system design.
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Papers by Kavita Rathore