@article{oai:nagoya.repo.nii.ac.jp:00030669, author = {Nakamura, Keiji and Yamabe, Chobei and Horii, Kenji}, issue = {2}, journal = {Memoirs of the School of Engineering, Nagoya University}, month = {Mar}, note = {This paper describes the improvement of a corona-preionized TEA-CO[2] laser and its application to non-destructive and remote inspection of an electric suspension insulator. The laser output energy was increased by superposing a high-frequency corona discharge (HFCD) on the main discharge due to the suppression of glow-to-arc transition even for the input energy density over 200 J /1. The HFCD was also produced without another power supply by using the SC-HFCD circuit, in which the residual energy not to be injected into the main discharge volume was recycled as the energy source of the HFCD in the next laser operation. Furthermore the TEA-CO[2] laser was utilized as a vibrational source, and the natural vibration of an electric insulator was excited. The dependence of the vibrational amplitude on the irradiation intensity was explained by the model combining the vibrational principles of thermal shock, reaction of spouting particles and the spherical shock wave. It was comfirmed that a cracked insulator can be distinguished from a normal one by detecting the change of the natural vibration due to the crack.}, pages = {177--223}, title = {Improvement of corona-preionized TEA-CO2 laser and its application to non-destructive and remote inspection}, volume = {44}, year = {1993} }