| 摘要 |
PROBLEM TO BE SOLVED: To decrease a correction error to a change density in a space charge measurement for a dielectric object having two different permittivities. SOLUTION: A high voltage pulse Vp(t) of a narrow pulse width is applied to both ends of a measurement sample 50 which is a dielectric object having two different permittivities #11, #12 via electrodes 4, 5. A detection voltage signal V(0), V(D) corresponding to a pressure wave generated at an interface between the measurement sample 50 and the electrode 4, 5 is operated by a preliminarily determined operation element of a deconvolution process, thereby correcting a space change density of the measurement sample. At this time, a proportional constant (k) of the preliminarily measured two permittivities of the measurement sample is obtained, and multiplied by the low permittivity #12 which is the preliminarily determined operation element of the deconvolution process, thereby obtaining an operation element of the deconvolution process. Since the thus-obtained operation element is applied, the space charge density of a part of the dielectric object having the low permittivity can be corrected with a small error.
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