اندازه‌گیری رطوبت خرما با روش غیر مخرب دی‌الکتریک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد،گروه ماشین های کشاورزی، دانشکده کشاورزی دانشگاه صنعتی اصفهان

2 استادیار، گروه ماشین های کشاورزی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان

3 دانشیار، گروه ماشین های کشاورزی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان

4 دانشجوی کارشناسی ارشد، گروه ماشین های کشاورزی، دانشکده کشاورزی،دانشگاه صنعتی اصفهان

چکیده

برآورد سریع و غیر مخرب رطوبت اهمیت بسزایی در مدیریت برداشت، انبار‌داری، فروش، و فراوری خرما دارد. در این تحقیق با روش خازن با صفحات موازی، ولتاژ متناوب سینوسی به محصول خرما اعمال و با دستگاه اسپکتروم آنالایزر پاسخ سیگنال خروجی مدار در محدودۀ فرکانسی 1 تا MHz 100 اندازه‌گیری گردید. از مدل‌های رگرسیون خطی چندمتغیره (MLR) به‌منظور استخراج رابطۀ بین رطوبت و مقادیر توان در فرکانس‌های گوناگون استفاده شد. نتایج مدل‌سازی با استفاده از تمامی محدودۀ فرکانس اعمال‌شده نشان داد که درصد رطوبت با R2p برابر 956/0، ریشۀ میانگین مربعات خطای (RMSEP) 28/5 درصد، و نسبت انحراف استاندارد (SDR) 97/2 قابل پیش‌بینی است. پس از بررسی ضرایب رگرسیون، تعداد شش فرکانس مؤثر در مدل‌سازی رطوبت خرما به‌منظور سادگی روش ارائه‌شده، تعیین شدند. نتایج مدل‌سازی رطوبت با استفاده از شش فرکانس، مشابه نتایج بدست‌آمده از کل محدودۀ فرکانسی ارزیابی شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Measurement of Date Fruit Moisture Content by Use of a Nondestructive Dielectric Method

نویسندگان [English]

  • Rahmatollah Bagheri 1
  • Seyed Ahmad Mireei 2
  • Morteza Sadeghi 3
  • Amin Allah Masoumi 2
  • Shahram Moomkesh 4
1 MSc. Students, Department of Farm Machinery, College of Agriculture, Isfahan University of Technology
2 Assistant Professors, Department of Farm Machinery, College of Agriculture, Isfahan University of Technology
3 Associate Professor, Department of Farm Machinery, College of Agriculture, Isfahan University of Technology
4 MSc. Students, Department of Farm Machinery, College of Agriculture, Isfahan University of Technology
چکیده [English]

Developing a rapid, nondestructive and reliable method to measure moisture content of date fruit is of interest in pre- and post-harvest processes of this valuable product. Throughout this research, by putting date palm fruits (cv. Mazafati) in a parallel plate capacitor, the sinusoidal alternative voltage in the frequency range of 1 to 100 MHz was exerted to the dates and the response of the circuit recorded while using a spectrum analyzer. Then, the relation between the power consumption of the system at different frequencies and the moisture content of the samples was studied and modeled using Multiple Linear Regression (MLR) analysis. The results indicated that by using the entire frequencies within the range of 1-100 MHz, the moisture content of date palm fruits could be predicted by a coefficient of determination (R2p) of 0.956, a Root Mean Squares Error of Prediction (RMSEP) of 5.28% and a Standard Deviation Ratio (SDR) of 2.97. By analysis of regression coefficients, some six effective frequencies in moisture content estimation were selected and used for building up the simpler models. The same similar results were obtained when compared with modeling by the entire range of frequencies.

کلیدواژه‌ها [English]

  • Capacitor
  • Function generator
  • Spectrum analyzer
  • modeling
  • Standard deviation ratio

مراجع

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مهندسی بیوسیستم ایران
دوره 45، شماره 2 - شماره پیاپی 2
پاییز و زمستان
مهر 1393
صفحه 97-104

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سابقه مقاله

  • تاریخ دریافت: 20 مهر 1392
  • تاریخ بازنگری: 12 اسفند 1392
  • تاریخ پذیرش: 04 خرداد 1393

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