食品与机械2017，Vol.33Issue(3)：71-74,79,5.DOI:10.13652/j.issn.1003-5788.2017.03.015
高频电热杀菌腔内粉料食品测温传感器的电磁屏蔽研究
Study on electromagnetic shielding of temperature sensor which measures the temperature of powder food in high frequency electrothermal sterilization equipment
摘要
Abstract
One kind of heat treatment machine for powder material was designed to use the metal screw impellor inside the sterilization chamber as the heating component connected to high frequency electricity.As strong magnetic field was generated during the process,the accuracy of temperature at critical control point (CCP) of the material measured by platinum resistor would be influenced,and this entailed the electromagnetic shielding (EM shielding).Based on both theoretical analysis and virtual simulation,our research was intended to design the shielding device.The relationships between the shielding effectiveness and the relative permeability,relative conductivity and thickness of different materials were analyzed.After narrowed down to several kinds of materials with various thickness,the shielding effectiveness of these materials was calculated by virtual simulation.It was found that Mn-Zn ferrite would be the proper shielding material for platinum resistor and the effectiveness of a 3 mm thick Mn-Zn ferrite cylinder shield could be higher than 40 dB.The shielding effect of this device prototype was proved to be acceptable in this study.关键词
高频电热/杀菌/温度传感器/电磁屏蔽/交变磁场/铂电阻Key words
high frequency heating/sterilization/temperature sensor/electromagnetic shielding/alternating magnetic field/platinum resistance引用本文复制引用
陶意,蔡健荣,张世庆,孙力,李馨..高频电热杀菌腔内粉料食品测温传感器的电磁屏蔽研究[J].食品与机械,2017,33(3):71-74,79,5.基金项目
江苏省高校自然科学研究重大项目(编号:15KJA550001) （编号:15KJA550001）
江苏省2015年度普通高校研究生实践创新计划项目(编号:SJZZ15_0130) （编号:SJZZ15_0130）
国家科技支撑计划(编号:2015BAD19B00) （编号:2015BAD19B00）
