超短波电场对金属周围升温变化的影响  

The study of temperature changes around metal in ultrashort wave electric-field and it~ influence factors

作　　者：梁维娣[1] 张志强[1] 孙师[1] 田丽君[1] 

机构地区：[1]中国医科大学附属盛京医院康复医学科,沈阳110023

出　　处：《中华物理医学与康复杂志》2011年第5期340-344,共5页Chinese Journal of Physical Medicine and Rehabilitation

摘　　要：目的探讨超短波电场对金属周围升温变化的影响因素。方法采用医用超短波治疗仪1档，调谐，输出80mA，取0．2ml水作为载体，金属物一端深入水中，改变金属物长度、金属物与电极板间垂直距离、金属物在电磁场中的摆放位置以及超短波的作用时间，采用数字电偶温度表测量不同治疗条件前、后水温的变化。结果相同条件下，金属线长轴平行于电极板，金属物场外实际长度为10cm、20cm、30cm、50CIll、70cnl、90cm时，其周围升温分别为4．37℃、8．30℃、18．00℃、20．64℃、32．92℃、38．96℃；金属物长轴平行于电极板，金属线与一侧电极板间垂直间距分别为1．5cm、3．0cm、4．5cm、6．0cm时，金属周围升温分别为66．03％、49．37℃、14．80℃、0．87℃；如果金属物长轴垂直于电极板，金属一端与极板间距离为5Ccm、9cm、15cm时，金属周围升温分别为56．10℃、26．64℃、11．07℃；金属与电场边缘的垂直间距为0cm、5cm、10cm、15cm时，金属周围升温分别为25．32℃、10．26℃、2．88℃、1．53℃；固定长度的金属物，涵盖入电场内的实际长度分别为20cm、10cm、0cm时，金属周围升温分别为2．84℃、4．04℃、7．30℃；同等条件下，改变超短波作用时间为5min、10min时，金属周围升温分别为24．90℃、39．07℃。结论当金属物长轴平行置于电极板正中间位置，且金属完全置于电场内并远离极板边缘时，通过减短金属物的长度、两极板间的距离以及超短波的作用时间，可降低金属物周围的升温幅度。Objective To study the temperature changes around metal in ultrashort wave electric-field and itg influence factors. Methods Medical ultrashort wave therapeutic instrument was used and output switcn was set at the I 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 2ram）. 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 vertical distances between metal and one electrode were 1.5, 3.0, 4.5 and 6.0cm, 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 distances between one end of metal and electrodes were 5, 9 and 15cm, water temperature around metal rose 56. 10,26. 64 and 11.07℃ , 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 and 7.30℃ , 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 relative

关 键 词：超短波 金属 温度 

分 类 号：R[医药卫生]