<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31428171</termId><termName>fluxgate magnetometers</termName><termType>PT</termType><termNote><![CDATA[ A kind of magnetometer used in aerial surveys consisting of one or more high-magnetic-permeability cores surrounded by primary and secondary windings. The signal picked up by the latter represents the direction and magnitude of the external magnetic field. ]]></termNote><termCreatedDate>2026-03-30 20:55:30</termCreatedDate><relation><relationType>UF</relationType><termId>31428172</termId><termName>flux-gate magnetometers</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31428173</termId><termName>fluxgate magnetometer</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31428174</termId><termName>magnetometers, fluxgate</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31428175</termId><termName>saturable core magnetometers</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31398432</termId><termName>magnetometers</termName><termType>PT</termType></relation></term>  </Zthes>