Abstract

Objective To study the temperature changes around metal in ultrashort wave electric-field and it's influence factors.Methods Medical ultrashort wave therapeutic instrument was used and output switen was set at the 1 st grade.After tuning, one end of metal object was placed into 0.2ml water contained in a plastic tube ( with a length of 2cm and diameter of 2mm).Temperature changes of water around metal in different conditions were measured by digital thermometer.In experiments, several different conditions were studied, such as the length of metal, the vertical distance between metal and electrodes, the location of metal ultrashort electric field and the action duration of ultrashort wave.Results Under the same condition, when the prolate axis of metal paralleled to electrodes and the real lengths of metal outside of electric field were 10cm, 20cm, 30cm, 50cm, 70cm, 90cm, water temperatures around metal rose 4.37, 8.30,18.00, 20.64, 32.92 and 38.96℃, respectively; when the prolate axis of metal paralleled to electrodes and the verticaldistances between metal and one electrode were 1.5, 3.0, 4.5 and 6.Ocm, water temperatures around metal rose 66.03,49.37, 14.80 and 0.87℃, respectively; when the prolate axis of metal was vertical to electrodes and the distanees between one end of metal and electrodes were 5, 9 and 15cm, water temperature around metal rose 56.10,26.64 and11.07℃, respectively; when the vertical distances between metal and the electrode edge were 0,5,10,15cm, water temperatures around metal rose 25.32 , 10.26 ,2.88 and 1.53℃, respectively;when the lengths of metal with a fixed-length,the included real length in electric field, were 20, 10 and 0cm, water temperatures around metal rose 2.84 , 4.04 and7.30℃ , respectively.Under the same condition, the action duration of ultrashort wave were changed to be 5 and 10min,water temperatures around metal rose 24.90 and 39.07℃, respectively.Conclusion This study show that the water temperature rising around metal will be relatively small when:( 1 ) the real length of metal is short ; ( 2 ) the prolate axis of metal parallels to electrodes and is placed in the middle area between two electrodes;(3)the distance between two electrodes increase and the action duration is short;(4)the overall length of metal is contained in electric field between electrodes,or the metal is kept away from electrodes edges. Key words: Ultrashort wave; Metal; Temperature

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