quadrupole probe

例句：

1. 1.The quadrupole probe is used to measure the magnetic field in a region.
   四极探针对测量一个区域内的磁场很有用。
2. 2. The quadrupole probe was developed to improve the accuracy of the measurement.
   四极探针被开发出来，以提高测量的准确性。
3. 3. The quadrupole probe was used to detect the presence of anomalous materials in the sample.
   四极探针被用来检测样本中异常物质的存在。