农产品加工·学刊（下）
農產品加工·學刊（下）
농산품가공·학간（하）
Academic Periodical of Farm Products Processing
2013年
7期
13-15,19
,共4页
高压脉冲电场%电压%频率%介电特性%苹果含水率
高壓脈遲電場%電壓%頻率%介電特性%蘋果含水率
고압맥충전장%전압%빈솔%개전특성%평과함수솔
high-voltage pulsed electric field%voltage%frequency%dielectric properties%apple's moisture content
真空冷冻干燥果蔬加工中采用高压脉冲电场处理技术能够增强果蔬细胞通透性而降低冻干能耗，因此基于果蔬在外电场作用下表现出的介电特性，在研究果蔬在线监测冻干水分变化、冻干工艺优化等方面有一定意义。以苹果为试材，对苹果进行高压脉冲电场预处理，在频率为102~106 Hz内测定苹果的等效电容、等效阻抗等电学参数，运用MATLAB软件对试验数据进行分析解脉冲电压、频率对介电特性的影响。结果表明，苹果的等效电容、等效阻抗均随脉冲电压、脉冲频率的增大而减小，且当测试频率在0~500 Hz时，苹果的等效阻抗对高压脉冲电场预处理试验的敏感性高于等效电容。测试频率为500 Hz，测试电压为1 V时，苹果的等效电容、阻抗与含水率均呈现显著相关关系，利用介电特性进行果蔬含水率检测可行。
真空冷凍榦燥果蔬加工中採用高壓脈遲電場處理技術能夠增彊果蔬細胞通透性而降低凍榦能耗，因此基于果蔬在外電場作用下錶現齣的介電特性，在研究果蔬在線鑑測凍榦水分變化、凍榦工藝優化等方麵有一定意義。以蘋果為試材，對蘋果進行高壓脈遲電場預處理，在頻率為102~106 Hz內測定蘋果的等效電容、等效阻抗等電學參數，運用MATLAB軟件對試驗數據進行分析解脈遲電壓、頻率對介電特性的影響。結果錶明，蘋果的等效電容、等效阻抗均隨脈遲電壓、脈遲頻率的增大而減小，且噹測試頻率在0~500 Hz時，蘋果的等效阻抗對高壓脈遲電場預處理試驗的敏感性高于等效電容。測試頻率為500 Hz，測試電壓為1 V時，蘋果的等效電容、阻抗與含水率均呈現顯著相關關繫，利用介電特性進行果蔬含水率檢測可行。
진공냉동간조과소가공중채용고압맥충전장처리기술능구증강과소세포통투성이강저동간능모，인차기우과소재외전장작용하표현출적개전특성，재연구과소재선감측동간수분변화、동간공예우화등방면유일정의의。이평과위시재，대평과진행고압맥충전장예처리，재빈솔위102~106 Hz내측정평과적등효전용、등효조항등전학삼수，운용MATLAB연건대시험수거진행분석해맥충전압、빈솔대개전특성적영향。결과표명，평과적등효전용、등효조항균수맥충전압、맥충빈솔적증대이감소，차당측시빈솔재0~500 Hz시，평과적등효조항대고압맥충전장예처리시험적민감성고우등효전용。측시빈솔위500 Hz，측시전압위1 V시，평과적등효전용、조항여함수솔균정현현저상관관계，이용개전특성진행과소함수솔검측가행。
Vacuum freeze drying fruit and vegetable processing can enhance fruit and vegetable cell permeability and reduce energy consumption of freeze by high-voltage pulsed electric field processing technology. Therefore, fruits and vegetables show on the dielectric properties under the action of electric field, research fruits and vegetables has a certain significance in on-line monitoring lyophilizing about changing of water and freeze-dried process optimization, etc. Based on apple's material, high-voltage pulsed electric field for apple is pretreated. In the electric field frequency range is 102~106 Hz, determining the electrical parameters of apple, such as equivalent capacitance and equivalent impedance. Using the MATLAB software to analyze the test data, the influence of the pulse voltage and frequency on dielectric properties is understood. The results show that the equivalent capacitance and equivalent impedance of apple is decrease with the pulse voltage, the pulse frequency increase. And when the electric field frequency is the 0~500 Hz, apple's equivalent impedance higher then the equivalent capacitance of the sensitivity of the high-voltage pulsed electric field pretreatment test. The electric field frequency is 500 Hz, the electric field voltage is 1 V, apple's equivalent capacitance, impedance and water content rate have significant correlation. Using the dielectric properties detect fruit and vegetable moisture is viable.
