Himanshu Patel
@pacific-soe.ac.in
Assistant Professor
Pacific School of Engineering
EDUCATION
M.Sc., M.Phil., Ph.D.
RESEARCH INTERESTS
Wastewater Treatment, Adsorption, Coagulation, Surface Chemistry
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Kanikdeep Flora and Himanshu Patel
Elsevier BV
Heena Patel, Himanshu K. Patel, and Igor Dinner
Springer International Publishing
Smell and Taste are the two very imperative senses which enable us in detection and discrimination of several volatile organic compounds, which in turn may be identified as indicators for specific desirable or undesirable conditions in various industries. Electronic nose and electronic tongue are recent technologies which have attracted many researchers to work in order to provide effective solutions for various industrial applications. This paper overviews the functionality of the electronic nose and electronic tongue and presents a summary of different sensors used for the said technologies. Also, a comparison between an E-nose and E-tongue is presented on the basis of relative figure of merits. A case study is presented wherein application of artificial nose and artificial tongue is discussed for the quality analysis of the fruits. The paper is aimed to emphasis on the possibilities of combining e-nose and e-tongue techniques to enhance the overall performance of the system used for food quality analysis. An E-nose combined with an E-tongue can be a highly efficient, non-invasive, fast and low cost method of quality analysis that can serve the industry and society for the betterment of the mankind
Khushboo K. Patel, Himanshu K. Patel, and Prutha H. Patel
IEEE
To investigate and monitor the quality of fruits is of utmost importance in order to decide the shelf life and vending price of the fruits. Many different methods are utilized to determine the quality of fruits which can be broadly categorized as either objective methods or subjective methods. Objective methods involve use of instruments and are offer precise results whereas subjective methods use human senses and results may vary with the users. Depending on whether fruit is broken during analysis or remains undamaged, quality analysis methods can be grouped as either destructive or nondestructive methods. This paper presents a qualitative comparison of destructive as well as nondestructive methods utilized for quality analysis of fruits. Detailed review is presented about the research progress in the area of fruit quality analysis. Different methods consider diverse quality attributes and accordingly the selection of method for particular fruit quality analysis is conceded. Decisive comparison of most commonly used methods of quality analysis presented in this paper can facilitate analysts and researchers to carryout in-depth study of one or more specific methods and help the end users to select most appropriate method for their application area.
A Hybrid set of pointers (HA) is used as a measurable technique for gaining inexact answers for combinatorial streamlining inconveniences. The proposed set of policies is a blend of Threshold Accepting (TA) and Hamming take a look at Algorithms (HSA). It consolidates the first-rate strategies of these calculations like global least uniting possessions of TA set of guidelines and fast union price of Hamming take a look at set of pointers. in this paper HA is implemented to put together One eighty level successions, that have suitable advantage difficulty. in this paper HA is utilized to combine One eighty phase arrangements with right gain difficulty. The blanketed groupings have complex signal form and exceedingly excessive to find out and examine with the valuable beneficial asset of a foe's advanced assist Measures (ESMs). The intermingling price of HA is affirmed to be valid
Himanshu K. Patel, Tanish Mody, and Anshul Goyal
IEEE
India faces the issue of energy theft at a very large scale. This paper introduces a system that removes human intervention in meter readings and bill generation thereby reducing the error that usually causes chaos and energy related corruption. The proposed system is implemented using a GSM shield module on microcontroller (Arduino®) together with LDR sensor and relay. Existing metering system can be minutely modified to implement the proposed meter. The proposed scheme is to connect an LDR sensor with the blinking LED and send the data to microcontroller via GSM shield. RTC provides delay and acts an interrupt. The system includes a provision of sending an SMS to user for update on energy consumption along with final bill generation along with the freedom of load re-configuration via SMS. The disconnection of power supply on demand or due to pending dues was implemented using a relay. Hardware implementation results suggest that the accuracy of the proposed system is slightly greater than that of existing smart meters. The cost of system has been estimated to be less than the available smart meters, offering the same functionality. Bilateral communication between user and system sets it apart from the commonly available smart meters
Himanshu K. Patel and Purva Joshi
IEEE
Every nation dreams for highly efficient and economical type of energy production units. The scenario of power sector is inversely proportional as far as the generation and demand of power is concern. In India, normally the power plants run on the availability of fuel and consumers. Majority of the power generation units are fuel based in Indian power sector. There are so many types of fuel but coal is cheapest and easily available fuel, therefore a large number of companies deal with the coal based thermal power plant. Thermal power plant have maximum efficiency around 32% to 42%. There are various losses associated in generation of electric power and to overcome or recover those losses, optimization is needed. Optimization can be considered at various stages of power generation. In pulverization process, the optimization is plays a crucial role. This paper presents overview of the pulverization process of the coal fired power plant and focuses on the optimization techniques which can be used to facilitate the power generation at optimal level. Different optimization techniques applied for coal pulverization are discussed and their relative comparison is presented which in turn may be helpful to the thermal power plant engineers for better and efficient operation of the plant.
Y Joshi, H Patel, and H Dave
CRC Press
P Nema, Himanshu Patel, and A Sahu
CRC Press
D.M. Joshi and H.K. Patel
IOP Publishing
Cryogenic engineering deals with the development and improvement of low temperature techniques, processes and equipment. A process simulator such as Aspen HYSYS, for the design, analysis, and optimization of process plants, has features that accommodate the special requirements and therefore can be used to simulate most cryogenic liquefaction and refrigeration processes. Liquefaction is the process of cooling or refrigerating a gas to a temperature below its critical temperature so that liquid can be formed at some suitable pressure which is below the critical pressure. Cryogenic processes require special attention in terms of the integration of various components like heat exchangers, Joule-Thompson Valve, Turbo expander and Compressor. Here, Aspen HYSYS, a process modeling tool, is used to understand the behavior of the complete plant. This paper presents the analysis of an air liquefaction plant based on the Linde cryogenic cycle, performed using the Aspen HYSYS process modeling tool. It covers the technique used to find the optimum values for getting the maximum liquefaction of the plant considering different constraints of other parameters. The analysis result so obtained gives clear idea in deciding various parameter values before implementation of the actual plant in the field. It also gives an idea about the productivity and profitability of the given configuration plant which leads to the design of an efficient productive plant.
N. Ravi Prakash, Kanikdeep Flora, Rajan Babu, R. Gangradey, and H. K. Patel
Springer Science and Business Media LLC
In tokamak, eddy currents are produced due to change in plasma positions during plasma instabilities that result into generation of electromagnetic forces on interaction with the induced currents. Measurement of this current is essential to design a mechanical structure that can withstand this force. Principle objective of this paper is the development of Rogowski coil sensor to measure eddy currents on a toroidal vessel. The paper presents an elaborative and practical construction technique of a Rogowski coil. The calibration method for the Rogowski coil is also presented. Rogowski coils as an eddy currents diagnostics are tested and experiments to measure induced currents on the toroidal vessel are performed using the coils. Experimental values of eddy currents are compared with the ANSYS simulation results.
Himanshu K. Patel, Deep Shah, Mauli Thacker, and Atman Shah
Springer Science and Business Media LLC
Plasma is the fourth state of matter. To sustain plasma in its ionic form very high temperature is essential. RF heating systems are used to provide the required temperature. Arching phenomenon in these systems can cause enormous damage to the RF tube. Heavy current flows across the anode–cathode junction, which need to be suppressed in minimal time for its protection. Fast-switching circuit breakers are used to cut-off the load from the supply in cases of arching. The crowbar interrupts the connection between the high voltage power supply (HVPS) and the RF tube for a temporary period between which the series switch has to open. The crowbar shunts the current across the load but in the process leads to short circuiting the HVPS. Thus, to protect the load as well as the HVPS a series switch is necessary. This paper presents the design and development of high voltage Series Switch for the high power switching applications. Fiber optic based Optimum triggering scheme is designed and tested to restrict the time delay well within the stipulated limits. The design is well supported with the experimental results for the whole set-up along with the series switch at various voltage level before its approval for operation at 5.2 kV.
Kusum. P. Soneji, H. K. Patel, and Shantanu Karkari
IEEE
In plasma physics a large number of data are needed to be acquired. For that purpose probes along with feed through are moved in and out through vacuum seal. In this paper, implementation of automated vacuum feed through drive is being proposed using stepper motor and lead screw. For the measurements of Spatial Plasma parameters, electric probes are inserted inside vacuum chamber that typically withstand very low vacuum on the order of 10-4Pa. The probes feed-through must withstand the differential pressure while the probes position is precisely manoeuvred with linear displacement as small as 0.5 mm. The stepper motors are known for application where high accuracy in motion is required. Its winding and control system are simple which makes them popular in motion control. The lead screw is utilized here to convert the rotary motion provided by stepper motor into linear motion. The stepper motor is controlled by software application developed in Lab view.
M. P. Pandya, H. D. Kabariya, S. K. Karkari, and H.K Patel
IEEE
This paper is devoted towards the study and comparison of different techniques for measurement of electron density in low temperature plasma. To study the plasma profile it is necessary that one should know about its parameter. Electron density is one of the important plasma parameters of plasma profile. Other plasma parameters like plasma frequency, Debye length and dielectric parameter are also depended on the density of electron. For the plasma density measurement, there are various techniques and each technique has its own unique advantages and some disadvantages as well. Basic techniques for plasma density measurement are Langmuir and Resonance probe based measurement techniques, microwave interferometer and optical emission spectroscopy. This paper also covers basics about plasma parameters. In the first section plasma parameters and their importance is described in brief. Then, principle, analysis and experimental setup for all basic four techniques are included in next section. The last section is devoted towards the comparison of these unique techniques.
Himanshu K. Patel and Mona J. Kunpara
IEEE
This paper presents the generalized response of electronic nose sensors to odorant and reviews the range of sensors used in electronic nose (e-nose) systems. The response of the sensor is analyzed as first order time response. This paper outlines the operating principles and important features of each sensor type as well as the applications in which the different sensors have been utilized. It also outlines the advantages and disadvantages of each sensor for application in a cost-effective e-nose system.
H. K. Patel, Deep Shah, Mauli Thacker, and Atman Shah
Springer Science and Business Media LLC
Plasma is the fourth state of matter. High temperature is essential to sustain the plasma in ionic form. The RF heating system used to provide the required temperature may get damaged due to occurrence of arcing. Series switch (circuit breaker) is one of the most effective and efficient methods of protecting RF generators. The series switch must be operated within stipulated time after the occurrence of electric fault and therefore the triggering circuit of series switch must be designed carefully to obtain optimum results. This paper presents the designs of high voltage series switch and crowbar circuit developed for the protection of RF heating system. An optimum triggering scheme is designed to obtain the triggering with the delay of only 4.8 μS as compared to the safety margin of 10 μS. The importance of optical triggering and utilization of fiber optic has been justified. The designs are well supported with the experimental results.
Himanshu K. Patel, Deep Shah, Atman Shah, and Mauli Thacker
IEEE
Plasma is a mixture of freely moving charged particles. To sustain these particles in ionic state, very high temperature is essential. RF heating systems are utilized for obtaining high temperatures. Arching phenomenon in these systems can cause enormous damage to the RF tube. Fast switching circuit breakers are used to cutoff the load from the supply in cases of arcing. The crowbar interrupts the connection between the high voltage power supply (HVPS) and the RF tube for a temporary period during which the series switch has to open. This paper presents the design and development of Crowbar based on fiber optic triggering for the protection of RF heating system. The importance of optical triggering and utilization of fiber optic has been justified. Protection techniques other than crowbar are briefly discussed. The design of Crowbar is well supported with the experimental results.
Himanshu K. Patel
IEEE
Flyback power supplies have a distinctive EMI signature caused by superposition of the transformer primary current (IPRI), drain voltage (VDrain), diode voltage (VDiode) and transformer secondary current (ISEC) waveforms; each generate emission currents which may exceed the desired EMI specification limits without proper EMI design technique. The primary current waveform causes primarily differential mode emission currents to circulate between the AC mains and the power supply input. It can also create common mode emissions due to radiated magnetic fields if the current path defined by the PC board layout encircles a large physical area. The drain voltage, diode voltage and secondary current waveforms are mainly responsible for the generation of common mode emission currents. Controlling EMI in SMPS requires attentions to following areas: 1. Differential mode filtering 2. Common mode filtering 3. Power cord damping 4. Transformer construction This paper addresses the concept of EMI signature in SMPS and presents conceptual techniques for EMI suppression. Differential mode filter analysis and common mode filter analysis are discussed in detail and an effective high frequency circuit model of the differential mode filter is obtained. Important aspects of power cord damping and transformer construction are also briefly covered. This paper is intended to be an efficient helping tool for the EMI filter designers.
Himanshu K. Patel, Mauli Thacker, Deep Shah, and Atman Shah
IEEE
Plasma is the fourth state of matter. High temperature is essential to sustain the plasma in ionic form. The RF heating system used to provide the required temperature may get damaged due to occurrence of arcing. Series switch (circuit breaker) is one of the most effective and efficient methods of protecting RF generators. The series switch must be operated within stipulated time after the occurrence of electric fault and therefore the triggering circuit of series switch must be designed carefully to obtain optimum results. This paper presents an optimum triggering scheme based on fiber optic triggering. The importance of optical triggering and utilization of fiber optic has be justified. The design is well supported with the experimental results. Finally the system is designed to obtain the triggering with delay of only 4.8 muS as compared to the safety margin of 10 muS.
Himanshu K. Patel
IEEE
The Flyback topology results in significant cost and space savings for multiple output power supplies for power levels up to 100 W. Flyback topologies store and transfer energy using a transformer, which due to physical limitations can cause large voltage transient spikes during the switching cycle at the drain of the power switch and at the secondary rectifier. This paper presents an overview of dissipative voltage snubbers and discusses their design guidelines to suppress the voltage transients on both the primary and secondary sides of a flyback converter. In particular, Snubbers used to reduce the stress on the switch and improve efficiency in a flyback topology are discussed.
Himanshu K. Patel and Rajendra B. Jadeja
IEEE
In this paper, various interference cancellation techniques that are used in DS-CDMA are analyzed and their performance characteristics are simulated and evaluated. The conventional matched filter receiver, decorrelating detector, successive interference canceller and parallel interference canceller are considered. Combination of parallel canceller and decorrelating detector is been modeled for performance consideration & comparison. For spreading sequence, some portion of the long m-sequence generated from the primitive polynomial is used. This sequence doesn't hold good in terms of properties and performance. To employ better spreading sequences, the gold sequences generated from the preferred pairs are also applied for the performance evaluation and comparison. For simulation, synchronous and AWGN (additive white Gaussian noise) are assumed. Performance of those interference cancellation techniques are simulated and the results are highlighted which proves to be very much suited for DS-CDMA systems.
Himanshu K. Patel
IEEE
Offline switching power supplies have high voltage and high current switching waveforms that generate electromagnetic interference (EMI) in the form of both conducted and radiated emissions. Consequently, all offline power supplies must be designed to attenuate or suppress EMI emissions below acceptable limits. EMI filters are actually simple combinations of inductors or chokes and capacitors but many key parameters need extra care and attention while designing the optimum EMI filter. This paper addresses this subject and presents a conceptual view of some critical design considerations for EMI filter optimization. Some important guidelines for the selection of EMI filter components are suggested to provide an efficient helping tool for the designers.