该仪器选择了性能稳定、线膨胀系数低于石英的含铌特种铟瓦棒材料为基线,并使在运输、安装与使用过程中彻底避免了石英管基线的炸裂现象,提高了可靠性;选用电涡流传感器,与磁传感器相比,其灵敏度不再受现场安装定位的影响,提高了仪器灵敏度的长期稳定性;标定器采用 The instrument chooses stable niobium-containing special indium watt-bar material with lower thermal expansion coefficient than quartz as the base line and completely avoids the cracking of the quartz tube base during transportation, installation and use, which improves the reliability. Eddy current sensor, compared with the magnetic sensor, the sensitivity is no longer affected by the site installation and positioning, improve the long-term stability of the instrument sensitivity; calibrator