IEC 62758, which is a technical specification, presents a standard method to estimate the performance of a pulsed electro-acoustic (PEA) measurement system. For this purpose, a systematic procedure is recommended for the calibration of the measurement system. U sing the procedure, users can estimate whether the system works properly or not.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 4 Basic theory for measurement 4.1 Permittivity and induced charge density 4.2 Charge in dielectrics and Poisson\u2019s law <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 4.3 Coulombic force of charge in electric field 4.4 Reflection and transmission of pressure wave 4.5 Maxwell stress <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4.6 Response of linear system 5 Procedure to calibrate the space charge measurement 5.1 Principle of calibration 5.1.1 General <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 5.1.2 Typical result of calibration measurement Figures Figure 1 \u2013 Theoretical distributions for calibration measurement <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5.2 Sample preparation 5.2.1 Sample for calibration measurement Figure 2 \u2013 Typical result of calibration measurement <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5.2.2 Sample placement 5.3 Data acquisition 5.3.1 Pulse voltage test 5.3.2 Averaging Figure 3 \u2013 Drop of silicone oil and sample placement Figure 4 \u2013 Pulse voltage application test <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5.3.3 Data acquisition for calibration Figure 5 \u2013 Dependence of averaging number <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.3.4 Signal obtained under short circuit condition 5.4 Data processing and calibration 5.4.1 Deconvolution Figure 6 \u2013 Measurement of waveform for calibration Figure 7 \u2013 Confirmation of absence of space charge accumulation during d.c. voltage application for calibration <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.4.2 Calibration for horizontal axis and calculation of waveform for electric field distribution 5.4.3 Calibration for electric field and charge density distributions Figure 8 \u2013 Deconvolution and calibration <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 5.4.4 Confirmation of linearity of measurement 5.4.5 Typical test results by expert members of project team Figure 9 \u2013 Calibration for electric field and charge density distributions Figure 10 \u2013 Confirmation of linearity measurement <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Figure 11 \u2013 Results of calibration test by research Group A Figure 12 \u2013 Results of calibration test by research Group B <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Figure 13 \u2013 Results of calibration test by research Group C Figure 14 \u2013 Results of calibration test by research Group D Figure 15 \u2013 Results of calibration test by research Group E <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Table 1 \u2013 Measurement resolution <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Annex A (informative) Theory of PEA method <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Figure A.1 \u2013 Principle of acoustic wave generation in PEA method <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Figure A.2 \u2013 Pressure wave propagation in PEA measurement system <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | Figure A.3 \u2013 Response of piezo-transducer Figure A.4 \u2013 Transform from pressure to amount of charge induced on piezo-transducer <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Figure A.5 \u2013 Relationship between the pulse width and thickness of piezo-transducer <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Figure A.6 \u2013 Adequate spatial resolution <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Figure A.7 \u2013 Example of two types of signal <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Figure A.8 \u2013 Calculation flow for deconvolution <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Figure A.10 \u2013 PEA measurement apparatus <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Figure A.11 \u2013 Equivalent circuit for voltage application <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Figure A.12 \u2013 Equivalent circuit for signal detection <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Calibration of space charge measuring equipment based on the pulsed electroacoustic (PEA) measurement principle<\/b><\/p>\n |