Eddy current, magnetic leak, magnetic particle and ultrasonic test are the main methods used for pumping rod test.
目前，对抽油杆的自动探伤主要有涡流、漏磁、磁粉及超声方法，各有其优缺点及适用范围。
Laser pumping magnetometers using alkali vapors as sensing medium can reach very high sensitivities in magnetic fields covering the range from the earth magnetic field to biological magnetic fields.
激光光泵碱金属磁力仪具有很高的灵敏度，测量范围可以从地球磁场到生物磁场。
Laser pumping magnetometers using alkali vapors as sensing medium can reach very high sensitivities in magnetic fields covering the range from the earth magnetic field to biological magnetic fields.
激光光泵碱金属磁力仪具有很高的灵敏度，测量范围可以从地球磁场到生物磁场。
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