物理实验 第25卷 Single- phase rotating magnetic field experimental a pparatus with frequency varying po wer supply TON G Peixiong, ZHAO Zaizhong Department of Physics, Fudan University, Shanghai 200433, China) Abstract: A single-p hase rotating magnetic field experimental apparatus with frequency-varying power supply is int roduced. The inductor, loss resistance and velocity of rotation can be measured ur- Key words: single-p hase rotating magnetic field; resonance; capacitance; inductance; loss resist ance (上接第16页) Ma king sta bilized DC supply CHEn Zhao-dong, YANG Zhenping So ut hwest University of Science and Technology, Mianyang 621002, China) the load changed from 14 Q to 409, the output electric current is stabilized within #my upply.If Abstract: It is introduced how to use L M3 17 to make a stabilized direct current (dc) Key words: stabilized DC supply; LM317 产品动态 光学元件库—欧普特科技 北京欧普特科技有限公司参照国际通用规格及技术指标,备有完整系列的精密光学零部件(备有产 品样本供参考)供国内各大专院校、科研机构和实验室随时选用,我公司同时可为您提供技术咨询 光学透镜:平凸、双凸、平凹、双凹、消色差胶合透镜等,直径1~150mm,焦距1~1000m,材料包 括光学玻璃、紫外石英玻璃、有色光学玻璃和红外材料 光学棱镜:1~50mm各种规格直角棱镜及其它常用棱镜 光学反射镜:各种尺寸规格的镀铝、镀银、镀金及介质反射镜,直径5~200mm 光学窗口:各种尺寸规格材料的光学平面窗口和平晶,直径5~200mm 各种有色玻璃滤光片:直径5~200mm(紫外、可见、红外) 紫外石英光纤:进口紫外石英光纤,SMA接口光纤探头,紫外石英聚焦探头 地址:北京市海淀区知春路49号希格玛大厦B座#306室邮编:100080 联系人:陈锵刘传峰石冀阳 电话:01088096218/88096217传真:01088096216 E-mail:kevinchen@goldway.comcn;liuchuanfeng@goldway.comcn;optics@goldway.com.cn 网址:www.goldway.com.cn.cn 2 01995-2005 Tsinghua Tongfang Optical Disc Co, Lid. All rights reserved.Single2phase rotating magnetic field experimental apparatus with frequency2varying power supply TON G Pei2xiong , ZHAO Zai2zhong (Department of Physics , Fudan University , Shanghai 200433 , China) Abstract : A single2p hase rotating magnetic field experimental apparatus with frequency2varying power supply is introduced. The inductor , loss resistance and velocity of rotation can be measured u2 sing t he apparat us. Key words : single2p hase rotating magnetic field ; resonance ; capacitance ; inductance ; loss resist2 ance (上接第 16 页) Making stabilized DC supply CH EN Zhao2dong , YAN G Zhen2ping (Sout hwest University of Science and Technology , Mianyang 621002 , China) Abstract : It is introduced how to use LM317 to make a stabilized direct current (DC) supply. If t he load changed from 14 Ω to 40 Ω, t he outp ut electric current is stabilized wit hin ±3 mA. Key words : stabilized DC supply ; LM317 产品动态 光学元件库 ———欧普特科技 北京欧普特科技有限公司参照国际通用规格及技术指标 ,备有完整系列的精密光学零部件(备有产 品样本供参考) 供国内各大专院校、科研机构和实验室随时选用 ,我公司同时可为您提供技术咨询. 光学透镜 :平凸、双凸、平凹、双凹、消色差胶合透镜等 ,直径 1～150 mm ,焦距 1～1 000 mm ,材料包 括光学玻璃、紫外石英玻璃、有色光学玻璃和红外材料. 光学棱镜 :1～50 mm 各种规格直角棱镜及其它常用棱镜. 光学反射镜 :各种尺寸规格的镀铝、镀银、镀金及介质反射镜 ,直径 5～200 mm. 光学窗口 :各种尺寸规格、材料的光学平面窗口和平晶 ,直径 5～200 mm. 各种有色玻璃滤光片 :直径 5～200 mm (紫外、可见、红外) . 紫外石英光纤 :进口紫外石英光纤 ,SMA 接口光纤探头 ,紫外石英聚焦探头. 地 址 :北京市海淀区知春路 49 号希格玛大厦 B 座 # 306 室 邮编 :100080 联系人 :陈 锵 刘传峰 石冀阳 电话 :010288096218/ 88096217 传真 :010288096216 E2mail :kevinchen @goldway. com. cn ; liuchuanfeng @goldway. com. cn ; optics @goldway. com. cn 网 址 :www. goldway. com. cn. cn 02 物 理 实 验 第 25 卷 © 1995-2005 Tsinghua Tongfang Optical Disc Co., Ltd. All rights reserved