金属ホーンを用いた磁歪式超音波細菌破壊装置
Magnetostrictive Ultrasonic Bacteria Destroying Apparatus with a Metallic Horn

Jun'ichi Saneyoshi, Eiji Mori, Masao Ide
1958 Acoustical Science and Technology  
Anew system of the low frequency ultrason 三 c apparatus for bacteria destruc . tion was developed for 畏 aboratory use , Th ・ p1・ t ・ f thi・ ・y ・tgm i・ n ・ t t・ P ・・ d ・ ・ e an i・tense ・ 1t・a ・ ・ ni ・ fi ・ ld i・ liq。 id but t・ vib 「ate a small pa ・t ・ f th ・ b・tt・m ・f ・ m ・tallic sph ・ ・ica1且・ ・ k vi ・ 1ently. Th 。 driving system consists of a 20 Kc rectangular magneto ・ strictive transducer and a reso . nant metaHic exponen しia瓦 horn of ha 且 f wave length、 and they are sol 己ered together . The
more » ... red together . The vessel containing the liquid for treatment , made of stainless steel sheet of O. 7mm thickness , is placed on the narrow end of the metallic horn and is pressed again ・t it with adequat ・ press ・ ・ e ・ Hence , th ・ vessel i・ d・ta・habl・ and can b ・ p 。 、t . eurized conveniently . The introduction of the hom as a mechanical impedance transformer improved the efficiency . The voltage proportional to the ve 且 ocity or the displacernent of the horn end is indicated on a voltmeter as the measure of the destroying actMty . This voltage is produced by means of " motional impedance bridge " which is inserted between the power amplifier and the transducer . This voltage must be the more direct measure of the activity than the sound pressure in the vessel or the driving current of the transducer . The frequency of 20 kc was selected so as to avoid the deterioration of the con . tents in the ce1l and the discomfortable sustained noise . The actual test for the destruction of coH bacteria are described also . § 1. 緒
doi:10.20697/jasj.14.4_327 fatcat:p7jal5pxyfe3pbwryoxpbxtqx4