Cantilever enhanced based photoacoustic detection of SF6 decomposition component SO2 using UV LED

Sensor Review ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Tunan Chen ◽  
Fengxiang Ma ◽  
Yue Zhao ◽  
Zhenghai Liao ◽  
Zongjia Qiu ◽  
...  
Keyword(s):  
Detection Limit ◽  
Detection System ◽  
Light Sources ◽  
Photoacoustic Detection ◽  
Low Light ◽  
Power Requirement ◽  
Light Power ◽  
Content Type ◽  
Uv Led ◽  
Sf6 Decomposition

Purpose This paper aims to establish a photoacoustic detection system for SO2 using UV-LED and testify its feasibility for sensitive measurement. The work in this paper can avoid potential crossover interference in infrared (IR) range and also balance the capability and cost of feasible excitation for photoacoustic detection system. Design/methodology/approach In this experimental work, a cantilever-enhanced–based photoacoustic SO2 detection system using an ultraviolet (UV) LED light source with a light power of 4 mW as the excitation was established. Findings A feasible photoacoustic detection system for SO2 using UV-LED was established. Experimental results demonstrate that the detection limit of the system can reach the level of 0.667 ppm, which can serve as a reference for the application of PAS in insulation fault diagnosis. Originality/value This work investigated the potential of using ultraviolet photoacoustic spectroscopy to detect trace SO2, which provided an ideal replacement of infrared-laser-based detection system. In this paper, a photoacoustic detection system using LED with a low light power was established. Low light power requirement can expand the options of light sources accordingly. In this paper, the absorption characteristics of SO2 in the presented detection system and ultraviolet range were studied. And the detection limit of the presented system was given. Both of which can provide reference to SO2 detection in ambient SF6.

scholarly journals Application of Excimer Lamp in Quantitative Detection of SF6 Decomposition Component SO2

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8165
Author(s):  
Tunan Chen ◽  
Kang Li ◽  
Fengxiang Ma ◽  
Xinjie Qiu ◽  
Zongjia Qiu ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Detection System ◽  
Absorption Peak ◽  
Trace Gas ◽  
Quantitative Detection ◽  
Light Sources ◽  
Excimer Lamp ◽  
Sf6 Decomposition ◽  
Term Monitoring

Accurate quantitative detection for trace gas has long been the center of failure diagnosis for gas-insulated equipment. An absorption spectroscopy-based detection system was developed for trace SF6 decomposition SO2 detection in this paper. In order to reduce interference from other decomposition, ultraviolet spectrum of SO2 was selected for detection. Firstly, an excimer lamp was developed in this paper as the excitation of the absorption spectroscopy compared with regular light sources with electrodes, such as electrodeless lamps that are more suitable for long-term monitoring. Then, based on the developed excimer lamp, a detection system for trace SO2 was established. Next, a proper absorption peak was selected by calculating spectral derivative for further analysis. Experimental results indicated that good linearity existed between the absorbance and concentration of SO2 at the chosen absorption peak. Moreover, the detection limit of the proposed detection system could reach the level of 10−7. The results of this paper could serve as a guide for the application of excimer lamp in online monitoring for SF6-insulated equipment.

LED MODULE WITH ELECTRONIC ILLUMINATION CONTROL

2019 ◽  
Vol 1 (12) ◽  
pp. 146-154
Author(s):  
V. Lisovenko ◽  
D. Lisovenko ◽  
O. Bazyk
Keyword(s):  
High Precision ◽  
Single Point ◽  
Dynamic Control ◽  
Directional Pattern ◽  
Current Strength ◽  
Design Parameters ◽  
Light Sources ◽  
Computer Design ◽  
Light Power ◽  
Electron Dynamic

Many energy saving tasks can be solved thanks to the current advances in LED technology in the production of semiconductor light sources. Modern production of solid-state LEDs guarantees high-precision compliance with the calculated design parameters of illumination devices. This opens up wide opportunities for high-precision control of the lighting parameters of a multicomponent module: light power, a directional pattern and a distribution of illumination. Today, the methodical issues of the preliminary modeling of LED illumination devices with the given parameters are fundamentally solved. There is a shift from manual calculations to computer design and need to develop and select the most effective mathematical modeling methods. The paper presents a consistent approach to the modeling of the distribution of illumination on a horizontal plane from the planar LED module, based on the Lambert type of radiation of a single point source. Simple mathematical expressions, programmed on a personal computer, are obtained. The example of a 25-LED floodlight has shown the ability of dynamic control the lighting characteristics of the module. Connecting patterns of separate LEDs or their groups allow to change the direction pattern of the lamp by the appropriate way of switching diodes with different aperture of radiation. The lighting power can be controlled within the linearity of the ampere-brightness characteristics by changing the current strength through the LED. The static selection of characteristics is controlled by the geometry of the location of discrete sources. The formation of uniform illumination of the plane is graphically illustrated. The electron-dynamic way of controlling the lighting parameters of the LED floodlight is confirmed by the inventor’s certificate.

scholarly journals Constant Optical Power Operation of an Ultraviolet LED Controlled by a Smartphone

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4707
Author(s):  
Ching-Hua Chen ◽  
Jia-Jun Zhang ◽  
Chang-Han Wang ◽  
Yu-Chia Chang ◽  
Pinghui S. Yeh
Keyword(s):  
Uv Light ◽  
Light Output ◽  
Color Temperature ◽  
Constant Light ◽  
Driving Voltage ◽  
Light Power ◽  
Monolithically Integrated ◽  
Uv Led ◽  
Power Operation ◽  
Arduino Uno

Constant light power operation of an ultraviolet (UV) LED based on portable low-cost instrumentation and a monolithically integrated monitoring photodiode (MPD) has been reported for the first time. UV light irradiation has become one of the essential measures for disinfection and sterilization. Monitoring and maintaining a specified light power level is important to meet the criteria of sterilization. We built a module composed of a monolithically integrated UV LED and MPD, a transimpedance amplifier, an Arduino Uno card, a digital-to-analog converter and a Bluetooth transceiver. An Android App that we wrote remotely controlled the UV LED module via Bluetooth. The Arduino Uno card was programmed to receive demands from the smartphone, sent a driving voltage to the LED and returned the present MPD voltage to the smartphone. A feedback loop was used to adjust the LED voltage for maintaining a constant light output. We successfully demonstrated the functioning of remote control of the App, and the resultant UV LED measured power remained the same as the setting power. This setup can also be applied to visible or white LEDs for controlling/maintaining mixed light’s chromaticity coordinates or color temperature. With such controlling and internet capability, custom profiling and maintenance of precision lighting remotely would be possible.

Parameters of automated fraud detection techniques during online transactions

2018 ◽  
Vol 25 (3) ◽  
pp. 702-720 ◽  
Author(s):  
Vipin Khattri ◽  
Deepak Kumar Singh
Keyword(s):  
Detection System ◽  
Fraud Detection ◽  
Security System ◽  
Research Papers ◽  
Content Type ◽  
Detection Techniques ◽  
Online Transactions ◽  
Detection Systems ◽  
Different Types ◽  
Depth Study

Purpose This paper aims to provide information of parameters and techniques used in the automated fraud detection system during online transaction. With the increase in the use of online transactions, the concerns regarding data security have also increased. To tackle the frauds, lot of research has been done and plethora of papers are available on the related topics. The purpose of this paper is to provide the clear pathway for researchers to move in the direction of development of automated fraud detection system to prevent the fraud during online transaction. Design/methodology/approach This literature review analyses and compares the different types of techniques for detecting fraud during online transaction. An in-depth study of the most prominent journals has been done and the core methodology of the papers has been presented. This article also shed some light on different types of parameters used in fraud detection techniques during online transaction. Findings There are vast varieties of various fraud detection techniques, and every technique has completed task in its own way. After studying approximately 41 research papers, 14 books and four reports, in total 30 parameters have been identified and a detailed study of the parameters has been presented. The parameters are also listed with their details that how these parameters are used in the security system for detecting online transaction fraud. Research limitations/implications This paper provides empirical insight about the parameters and their prominence in the development of automated fraud detection security system of online transaction. This paper encourages the researchers to development of improved fraud detection system. Practical implications This paper will pave the way for researchers to do a focused research on the fraud detection methodologies. The analysis will help in zeroing down the most prevalent topic of research in this field. The researchers will be able to understand the internal details of parameters and techniques used in the fraud detection systems. This literature also helps the research to think in a variety of ways that how these parameters will be used in the development of fraud detection system. Originality/value This paper is one of the most comprehensive reviews in its field. It tries and attempts to fill a void created because of lack of compilation of the laid fraud detection parameters.

Makespan of routing and security in Cross Centric Intrusion Detection System (CCIDS) over black hole attacks and rushing attacks in MANET

2019 ◽  
Vol 7 (4) ◽  
pp. 162-176
Author(s):  
Rajendran N. ◽  
Jawahar P.K. ◽  
Priyadarshini R.
Keyword(s):  
Quality Of Service ◽  
Intrusion Detection ◽  
Response Time ◽  
Intrusion Detection System ◽  
Security Policy ◽  
Ad Hoc ◽  
Detection System ◽  
Content Type ◽  
The Cost

Purpose The purpose of this paper is to apply security policies over the mobile ad hoc networks. A mobile ad hoc network refers to infrastructure-less, persistently self-designing systems; likewise, there is a noteworthy innovation that supplies virtual equipment and programming assets according to the requirement of mobile ad hoc network. Design/methodology/approach It faces different execution and effectiveness-based difficulties. The major challenge is the compromise of performance because of unavailable resources with respect to the MANET. In order to increase the MANET environment’s performance, various techniques are employed for routing and security purpose. An efficient security module requires a quality-of-service (QoS)-based security policy. It performs the task of routing and of the mobile nodes, and it also reduces the routing cost by finding the most trusted node. Findings The experimental results specify that QoS-based security policy effectively minimizes the cost, response time as well as the mobile makespan (routing cost and response time) of an application with respect to other existing approaches. Research limitations/implications In this paper, the authors proposed an enhancement of Cross Centric Intrusion Detection System named as PIHNSPRA Routing Algorithm (PIHNSPRA). Practical implications It maps the security with the secure IDS communication and distributes the packets among different destinations, based on priority. This calculation is proposed for the purpose of routing and security by considering greatest throughput with least routing cost and reaction time. Social implications When the concept is applied to practical applications. Quality of Service introduced in the proposed research reduces the cost of routing and improves the throughput. Originality/value The proposed calculation is tested by NS2 simulator and the outcomes showed that the execution of the calculation is superior to other conventional algorithms.

Development and commissioning of FBG sensors for impact test of rock fall protective barrier

Sensor Review ◽  
2014 ◽  
Vol 34 (4) ◽  
pp. 343-348 ◽  
Author(s):  
Yongxing Guo ◽  
Dongsheng Zhang ◽  
Zude Zhou ◽  
Fangdong Zhu ◽  
Li Xiong
Keyword(s):  
Real Time ◽  
Detection System ◽  
Field Application ◽  
Elastic Structure ◽  
Dynamic Force ◽  
Optimized Design ◽  
Element Analysis ◽  
Content Type ◽  
Protective Barrier ◽  
Force Transducers

Purpose – This paper aims to present an effective sensing detection system based on fiber Bragg grating (FBG) sensing technology for protective barriers that have been effectively applied to intercept and stop rocks from falling onto railway tracks. . Determination of exact stress and deformation values during impact tests for key components of the protective barrier forms important criteria for quality control of these barriers. Monitoring changes in force along the protective barrier when deployed in field application allows for real-time disaster warning for collapse and falling rocks. Design/methodology/approach – In this paper, we propose a monitoring strategy for key components of a protective barrier. During performance tests, dynamic force and strain were measured for the steel strands and supporting I-beam, respectively. Design of a special elastic structure for the force transducer based on finite element analysis and tensile tests has been discussed here. Two types of FBG force transducers were manufactured based on the elastic structure. Four FBG force transducers and four FBG strain sensors were used for impact verification testing of a new rigid protective barrier with a design protection level of 25 KJ. Findings – Dynamic force and strain responses were obtained during an impact of free-falling block with a kinetic energy of 25 KJ. Originality/value – The FBG monitoring scheme can be extremely valuable for optimized design of the barrier and can provide real-time disaster warning in regions of collapse and falling rocks.

Fraud triangle in public procurement: evidence from Indonesia

2019 ◽  
Vol 26 (4) ◽  
pp. 951-968 ◽  
Author(s):  
Ni Wayan Rustiarini ◽  
Sutrisno Sutrisno ◽  
Nurkholis Nurkholis ◽  
Wuryan Andayani
Keyword(s):  
Negative Affect ◽  
Conflicts Of Interest ◽  
Detection System ◽  
Public Procurement ◽  
Fraud Triangle ◽  
Effective Prevention ◽  
Content Type ◽  
The Government ◽  
The Relationship ◽  
Procurement Fraud

Purpose This study aims to examine the effects of fraud triangle (pressure, opportunity and rationalization) on individual fraudulent behavior in Indonesian public procurement. Empirical research in this area is relatively sparse. Design/methodology/approach Data were collected using laboratory experiments. Findings The results revealed that fraudulent behavior is higher when an individual has high pressure and high opportunity. These factors play an important role in determining individual rationalization. Most of participants used “displacing responsibility” to rationalize their actions. This study also demonstrated that negative affect mediates the relationship between fraudulent behavior and rationalization. Research limitations/implications First, fraudulent behavior research cannot be separated from social desirability bias. Second, the experiments only involved individual decision-making, not in groups. Finally, this study did not examine the effectiveness of rationalization in reducing negative affect. Practical implications Over the years, the government has only focused on the identification of pressure and reduction of opportunities, but ignored individual psychological reasons. Considering that procurement fraud is always increasing, the government must more focus on individual reasons to design an effective prevention and detection system. Social implications There are various conflicts of interest in public procurement budgeting. These conflicts can distort resource allocation and causes budget leakage. As a result, the government is incapacitated to achieve social and economic goals of the community. Originality/value There is limited research about fraud in public procurement budgeting, especially in developing countries. In addition, the fraud triangle research, which focuses on rationalization is still limited.

Target infrared radiation calculation model and method based on finite element analysis method in infrared photoelectric detection system

Sensor Review ◽  
2017 ◽  
Vol 37 (1) ◽  
pp. 26-32
Author(s):  
Hanshan Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Infrared Radiation ◽  
Detection System ◽  
Calculation Model ◽  
Analysis Method ◽  
Element Analysis ◽  
Content Type ◽  
Finite Element Analysis Method ◽  
Photoelectric Detection

Purpose The purpose of this paper is to evaluate the detection performance of infrared photoelectric detection system and establish stable tracking platform. Design/methodology/approach This paper puts forward making use of the finite element analysis method to set up the infrared radiation characteristics calculation model of flying target in infrared photoelectric detection system; researches the target optical characteristics based on the target imaging detection theory; sets up the heat balance equation of target’s surface node and gives the calculation method of total radiation intensity of flying target; and deduces the target detection distance calculation function; studies the changed regulation of radiation energy that charge coupled device (CCD) gain comes from target surface infrared heat radiations under different sky background luminance and different target flight attitude. Findings Through calculation and experiment analysis, the results show that when the target’s surface area increases or the target flight velocity is higher, the radiation energy that CCD obtained is higher, which is advantageous to the target stable detection in infrared photoelectric detection system. Originality/value This paper uses the finite element analysis method to set up the infrared radiation characteristics calculation model of flying target and give the calculation and experiment results; those results can provide some data and improve the design method of infrared photoelectric detection system, and it is of value.

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