Internship Report (Bachelor of Science in Applied Physics & Electronics)

Permanent URI for this collectionhttps://hdl.handle.net/10361/28418

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Open Access
Investigation of IV characteristic of semiconductor diode and resistor using keithley 2450 source meter operated by labview programming
(BRAC University, 2019) Mustafa, Anjum; Rahman, Muhammad Lutfor; Department of Mathematics and Natural Sciences
This internship report mainly focuses on Investigating the IV characteristic curve of diode and resistor using Keihley 2450 source meter operated by lab view programming. Using the Lab view programming such configuration was made where voltage is supplied and the corresponding current had been calculated for several points for both diode and resistor. A voltage versus Current graph was plotted using Origin lab according to the data from the setup and was investigated and compared with the theoretical properties of the diode and resistor with authentic reference. The measured data followed the theory and almost gave the same characteristic curves which proves that the programming in Labview and the setup in Keithley 2450 source meter was accurate for the measurement.
Open Access
Permeability measurements of Ni0.4Cu0.15Zn0.45Fe2O4 using impedance analyzer
(BRAC University, 2017) Shara, Afrin Jahan; Rahman, Muhammad Lutfor; Department of Mathematics and Natural Sciences
This internship presents the work of Ni0.4Cu0.15Zn0.45Fe2O4 sample preparation and its permeability measurements at different sintering temperature using 6500B impedance analyzer. Firstly ‘’Ni0.4Cu0.15Zn0.45Fe2O4‘’ sample were being prepared by using different materials according to their stoichiometric ratio using an electronic balance. The sample were then hand milled for 5 hours to gain a homogenous distribution and to remove impurities as much as possible by using an agate pestle and mortar. After that the sample was calcined at 950oC using a furnace to eradicate water, oxides. To achieve a more pure and uniform sample, it was hand milled for more 2 hours until the powder is finely mixed. Afterwards the sample was made into three disk and ring shapes for three sintering temperatures (Ts). Once the sintering is finished the disks and rings were ready to be analyzed. The ring shaped samples were examined by the impedance analyzer (Wayne Kerr 6500B Precision Impedance Analyzer) to calculate the permeability of the samples, the frequency to which the sample can operate.
Open Access
Internship on (Ni0.4Cu0.15Zn0.45)1-xMnxFe2O4 sample preparation and calcination
(BRAC University, 2017) Mridula, Zarrin Tasnim; Rahman, Muhammad Lutfor; Department of Mathematics and Natural Sciences
The sole purpose of this internship is to provide us hands on experience on how to measure, prepare and characterise a sample of the (Ni0.4Cu0.15Zn0.45)1-xMnxFe2O4 ferrites (x=0.3, x=0.45) which was further hand milled before and after calcination to achieve a homogenous distribution. In order to prepare the sample, the stoichiometric ratio was found, and then the exact amount of each required compound was measured separately using an AX120 electronic balance as it provides a high precision of 10 micrograms. It has a full range tare to allow unladed weight measurement. It was hand milled with a pestle and mortar and finally calcined at 950°C and sintered at 1100°C in air for 5 hours at 1100, 1150 and 12000C using a Nabertherm p330 to drive off water, carbon dioxide, and other volatile constituents and to oxidise the whole composite. Structural and magnetic properties of were investigated and it was prepared by solid state reaction methods.
Open Access
Ni0.48Cu0.12Zn0.40Gd0.04Fe1.96O4 (Ferrite) sample preparation, planetary ball milling and calcination
(BRAC University, 2017-06) Noor, Lamisha; Rahman, Muhammad Lutfor; Department of Mathematics and Natural Sciences
The purpose of the internship was to provide with a firsthand experience on how to measure and prepare a precise amount of the ferrite composite, Ni0.48Cu0.12Zn0.40Gd0.04Fe1.96O4 which was then further planetary ball milled for fourteen hours to achieve homogeneous distribution at 230 rpm, hand milled for a further four hours in two separate sessions using an agate pestle and mortar and finally calcined at 950℃ afterward using a Nabertherm p330 to drive off water, carbon dioxide, other volatile constituents and to oxidize the whole composite. In order to prepare the sample, first the stoichiometric ratio was found and then the exact amount of each required compound was measured separately using an AX120 electronic balance as it provides a high precision of 10 μg and has a full range TARE to allow unladen weight measurement. Planetary ball mill was used for grinding to ensure quick contamination free grinding down of the prepared sample to nano range. Nabertherm P330 was used for calcination as it can be functioned to allow and ensure easy setting of temperature values, time specifications and gradient specifications. These were crucial as the calcination process required the buildup of temperature over a span of two hours in intervals of 10℃ up to 950℃, held at that for five hours and then cooled back in instalments of 5℃. The final product was again ball milled to get rid of clusters and turned into powder thereby completing the preparation of the ferrite sample.
Open Access
Interface application development for a Keithley 6517B electrometer using LabVIEW programming to measure resistance and temperature as functions of time
(BRAC University, 10/15/2017) Ahmed, Arik Rafiquddin; Haque, Dr. Md. Firoze H.; Department of Mathematics and Natural Sciences
This internship was set to demonstrate a basic understanding of the Keithley 6517B electrometer and LabVIEW programming. Using LabVIEW software, a Keithley 6517B Electrometer was controlled so as to supply a voltage to a 1 MΩ fixed resistor while also measuring its temperature and resistance. A resistance vs time graph and temperature vs time graph were plotted using the software. For a duration of approximately 320 seconds the temperature increased from 7.5°C to 27.5°C while during that same period of time the resistance dropped from 1.0004MΩ to 0.9816MΩ.
Open Access
KEITHLEY 6517B Electrometer
(BRAC University, 2016-10) Shuva, Sudipta Das; Rahman, Md. Lutfor; Department of Mathematics and Natural Sciences
Keithley 6517B electrometer is a multifunctional electrometer which usually works with low current and high resistance. This electrometer can be controlled through interfacing. Labview software was used to interface this instrument. Using the Labview program and the electrometer electrical properties of electronic devices for example transistors, diodes, resistors etc. can be measured with more accuracy. By the end of the internship properties of several transistors, diodes and resistor were measured. In future the program that has been developed can be used further for sorting out the properties of other electronics appliances too.
Open Access
Design and development of smart low-cost home systems using Raspberry Pi
(BRAC University, 2017-12) Rafat, Nafis; Kiber, Dr. Adnan; Department of Mathematics and Natural Sciences
This research work aims to design and develop a smart low-cost home automation system with existing technology. The home automation becomes important, because it gives the user the comfortable and easily for using the home devices. The implementation and design of wireless home automation control used two methods, WLAN technology and RF remote control handheld to control of the selective home devices with integral security and protected system. The system is low cost and flexible with the increasing variety of devices to be controlled. Smart home automation has attracted the interest of the research community during the last decade. In today’s world automation plays a very important role and in this project an automated way of controlling home appliances through human interaction as well as through self-control of the system itself is provided. The manual mode helps user to control home appliances automatically using PC or any Wi-Fi enabled Mobile phone in the same local area network. The system designed and implemented here uses simple easy-to-use programmable devices like the Raspberry Pi and other hardware that can be easily sought out and implemented including relays and motor controllers. One of the main aims of this paper is to establish that home automation can be cheap to set up, if one does not want to purchase existing expensive gadgets that are available on the market. It was possible to successfully meet most of the objectives required. However, there is room for improvement in terms of both hardware and software in order to expand the functionality of the whole system for a range of other uses and features.
Open Access
An investigation of a gridconnected solar powered water pumping system
(BRAC University, 2016-02) Salam, Mohammed Shadman; Kaiser, Dr. M. Shamim; Department of Mathematics and Natural Sciences
The following research work highlights the working principles of a solar powered water pumping system and how it can be a viable option in the context of Bangladesh. The report intends to diﬀerentiate between two types of solar powered systems namely, Stand-alone systems and Grid-Connected Systems, and come to a conclusion as to which is more feasible to satisfy the water requirements for irrigation in rural areas. The conclusion is supported by means of data collected and evaluated using the facilities at Jahangirnagar University and some international sources. Finally, the examined data set is presented in the form of tables and graphs to further shed light on the prospect of solar powered technology.
Open Access
Optical characterisation of single junction monocrytalline silicon solar cell
(BRAC University, 2015-01) Tonima, Masuda Akter; Rahman, Muhammad Lutfor; Department of Mathematics and Natural Sciences
In this paper the character of a solar cell in terms of minority carrier diffusion length through surface photovoltage (SPV) technique is studied. SPV is measured with respect to wavelength where the spectral range is 400-1200 nm. A 200 μm thickness of 3″ X 3″ mono-crystalline silicon solar cell is used for the calculation purpose; through which the values of total carrier generation and recombination during illumination are found. For the range, 700-1000 nm wavelength penetration depth of the cell can be found. This helps in plotting of a curve that eventually gives us the value of carrier diffusion length which also helps in determining minority carrier lifetime of the cell, short circuit current density, optimum value of generation etc. For further study of the cells character, an efficiency test and an external quantum efficiency test is done via pre-set instruments built for the specific purpose, which helps in further confirmation of the quality of the fabricated cell.
Open Access
Development of a low cost MPPT circuit for Solar Panel
(BRAC University, 2014-09) Azim, Syeda Mayesha; Rahman, Muhammad Lutfor; Department of Mathematics and Natural Sciences
Renewable energy source have potential of playing a vital role in electricity generation. In Bangladesh, solar panel is now a widely used renewable energy source. So extracting maximum power from solar panel is vital. In order to maximize the output from a solar panel maximum peak power tracker (MPPT) should be introduced. This paper describes the design and development of a low cost MPPT circuit for extracting maximum power from the solar panel and charging a storage battery. The designed circuit consists of a microcontroller (PIC16F72) which generates high frequency pulse signal of different widths in accordance with the output of solar panel and electrical characteristics of the load to operate the panel at maximum power point. The generated pulse signal drives a DC-DC Buck-Boost converter which gives constant voltage of 15V to the battery ensuring optimum energy being extracted from the solar panel. The microcontroller controls the operation of the system according to the codes burned in it, which had been developed in MPLAB IDE.

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