Krzysztof Trzcinka

Sensitivity and Offset Voltage Testing in the Hall-Effect Sensors Made of Graphene

Paper presents the results of the hall effect testing in the graphene structures. Special hall effect structures were designed and build, using large graphene sheets. Laboratory testing stand was developed to test sensitivity and offset voltage in hall effect structures under external magnetic field. Characteristics of investigated structures were measured, including such impacting factors as structure size, external magnetic field strength, temperature and time.

Two-Axis, Miniature Fluxgate Sensors

Miniature fluxgate sensors are recently intensively developed and have become a valuable alternative to other magnetic sensors types. Presented two-axis miniature fluxgate sensors show new opportunities for further miniaturization of fluxgate magnetometers. Frame-shaped amorphous alloys cores for the sensors were etched from 25 μm-thick tape. Sensors were made in printed circuit board (PCB) multilayer technology. Sensors with Fe-based and Co-based cores were tested for different values of constant magnetic field in two directions. Experimental results confirmed their ability to accurately obtain two directional magnetic field measurements.

Advancement in Development of Graphene Flow Sensors

This article describes the research, development and tests of prototype graphene flow sensors. The prototype sensors were checked for impact of different parameters on value of electric charge generated on the graphene’s surface, such as volume flow value, flowing liquid ions concentration and liquid temperature. The information about developed transducers which convert signals from graphene sensor is presented.

Temperature Dependence of Functional Properties of Graphene Hall-Effect Sensors Grown on Si Face and C Face of 4H-SiC Substrate

Paper presents the results of investigation of the temperature influence on the basic functional properties of graphene Hall-effect sensors. The measurement system utilizing Helmholtz coils as a source of external magnetic field and environmental chamber for setting temperature was developed. Two types of monolayer graphene structures grown on both Si and C face of SiC substrate were investigated in the room temperature (about 20 oC) and their functional properties were compared. Next, the temperature influence on functional properties of both types of graphene structures was investigated using environmental chamber. The results of measurements are presented as charts and analyzed in the paper. On the basis of the results, conclusions were formulated, which are included in the last section of the paper.

Measuring Station for Testing of Graphene Flow Sensors

This article describes the construction and operation principle of a measuring station for testing of prototype graphene flow sensors. The measuring station enables for checking an impact of different parameters, such as volume flow value, flowing liquid concentration and liquid temperature on value of generated electric charge on the graphene’s surface. This paper also presents basic information about developed transducer which converts signals from graphene sensor. The essential part of the text is chapter about tests of the station. It contains information essential for depicting of real conditions during measurements of generated electric charge on the graphene’s surface. Reliability of the carried out research was checked by estimation of uncertainty of measurement equipment.

Dependence of Functional Characteristics of Miniature Two Axis Fluxgate Sensors Made in PCB Technology on Chemical Composition of Amorphous Core

Fluxgate sensors are common used in week and low frequency magnetic field measurements. Recently rapid development of miniature fluxgate sensors made in PCB technology is observed. Until now single core layer sensors were unable to measure magnetic field for two directions. Moreover no modelling results of influence of amorphous alloy chemical composition on sensor properties were available.

Development of Graphene Based Leak Detector

The following paper presents one of the possible applications of the graphene based flow detector developed at Industrial Research Institute for Automation and Measurements in cooperation with Institute of Electronic Materials Technology, Faculty of Physics of Warsaw University and Apator Powogaz company. Application involves using flow detector to measure the tightness of the water installation fittings. The construction and principle of operation of the developed graphene based leak detector are described in the paper. Results of performed investigation on functional properties and electromagnetic compatibility (EMC) are also presented. The uncertainty of the tightness measurement was determined. Finally, guidelines that should be met while constructing a leak detector are set in the paper.

Influence of Electromagnetic Pulse Disturbance on the Functional Properties of Ultra-High Resolution Analog to Digital Converter

This paper presents the results of the research on electromagnetic pulse disturbances impact on the performance of the 31 bit resolution analog-to-digital converter. The research was held for the following operating conditions of the AD converter: with and without the galvanic isolation through the signal lines. The results of measurements were calculated as the standard deviation in the number of the ADC’s elementary divisions. Standard deviation was used to quantify the impact on the accuracy of the AD converter measurements.

Influence of Operating Conditions on the Functional Properties of Ultra-high Resolution Analog to Digital Converter

This paper presents the results of measuring the impact of disturbances on the properties of a 31 bit resolution analog-to-digital converter. The researches were held for the following AD converter operating conditions: with battery supply or with switching power supply, for different ambient temperatures, with the galvanic isolation of the signal lines. The results of the measurements were calculated using standard deviation in the number of scale intervals. Standard deviation was used to quantify the impact on the accuracy of the measurements of an AD converter.

Investigation of the Functional and Environmental Characteristics of Elements with Graphene Coating

This paper presents environmental and functional tests to determine the areas for graphene coated element application. The researches were held for the following environmental testing of samples with graphene: cold, dry heat, rapid temperature changes and sinusoidal vibrations.