Use of a linear offset Hall effect transducer in student laboratory experiments to measure magnetic fields

Deacon, Christopher G.; Clarke, Hector C.

doi:10.1119/1.17374

Cited by 4 publications

(4 citation statements)

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“…RMS value is expressed by formula (1). If we are passing into the digital area RMS expression will change to (2), where n is the number of samples and u(i) is the actual voltage value:…”

Section: Driving On the Triac Basismentioning

confidence: 99%

Designing a Real Time Redactor for Power Saving Utilization

Krejcar

Frischer

2013

ElAEE

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Nowadays high importance is given to the development of green technologies which are designed with an emphasis on low energy consumption. Due to the financial crisis the need for such green technologies and devices is more important ever before. All home electric appliances like refrigerators, deep-freezes, washing machines, pumps, etc. produce waste current component, which can be stabilized. This technique can decrease electricity consumption from 10 to 30% -different depending on countries. Current modern devices for adjustment of power of target electrical appliances need a very fine measurement of an input voltage and current. In such cases remote monitoring of mentioned values can be a suitable solution. However, this solution contains some issues such as the need for pre-processing in remote sensor, or wireless transfer to central monitoring device, which need to be solved. Also the powering of such remote device is strictly limited. Sensor needs to be powered only by energy from the current sensor which results in the need for application of modern power source solutions. All of these findings result in a development of miniaturized solution based on 32b microcontroller unit with wireless communication unit and independent powering circuit.

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“…RMS value is expressed by formula (1). If we are passing into the digital area RMS expression will change to (2), where n is the number of samples and u(i) is the actual voltage value:…”

Section: Driving On the Triac Basismentioning

confidence: 99%

Designing a Real Time Redactor for Power Saving Utilization

Krejcar

Frischer

2013

ElAEE

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“…These circuits are relatively steady, therefore the voltage and current running are easy to analyze. The main problem in this application area is that too much reactive power is present [ 13 ]. It is a major problem which has to be resolved, because of the excess current strain of wires.…”

Section: Testing Of Developed Analyzer Device In Real Environmentsmentioning

confidence: 99%

Real Time Voltage and Current Phase Shift Analyzer for Power Saving Applications

Krejcar

Frischer

2012

Sensors

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Nowadays, high importance is given to low energy devices (such as refrigerators, deep-freezers, washing machines, pumps, etc.) that are able to produce reactive power in power lines which can be optimized (reduced). Reactive power is the main component which overloads power lines and brings excessive thermal stress to conductors. If the reactive power is optimized, it can significantly lower the electricity consumption (from 10 to 30%—varies between countries). This paper will examine and discuss the development of a measuring device for analyzing reactive power. However, the main problem is the precise real time measurement of the input and output voltage and current. Such quality measurement is needed to allow adequate action intervention (feedback which reduces or fully compensates reactive power). Several other issues, such as the accuracy and measurement speed, must be examined while designing this device. The price and the size of the final product need to remain low as they are the two important parameters of this solution.

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“…The availability of low-cost Hall-effect sensors greatly simplifies the study of magnetic fields, allowing measurements such as the distance dependence of fields produced by permanent magnets as well as those arising from an electric current. [1][2][3][4][5][6][7][8][9][10] Students in the second semester of our calculusbased general physics course spend one to two laboratory periods constructing and calibrating magnetometers that are used for multiple purposes in later laboratories. The magnetometers are built inside electrical switch boxes ͑fitted with a household light switch and telephone jack͒ and connected via telephone wire to back to back Hall chips ͑typically the Allegro 1321 11 ͒.…”

Section: Introductionmentioning

confidence: 99%