Use of a Density-Independent Function and Microwave Measurement System for Grain Moisture Measurement

1988 ◽  
Vol 31 (6) ◽  
pp. 1875-1881 ◽  
Author(s):  
S. D. Powell ◽  
B. D. McLendon ◽  
S. O. Nelson ◽  
A. Kraszewski ◽  
J. M. Allison
Keyword(s):  
Measurement System ◽  
Microwave Measurement ◽  
Independent Function ◽  
Moisture Measurement ◽  
Grain Moisture

Effects of Non-uniform Kernel Moisture Content on Moisture Measurement of Corn

2005 ◽  
Vol 1 (1) ◽  
pp. 77-93
Author(s):  
Bíborka Gillay ◽  
David B. Funk
Keyword(s):  
Moisture Content ◽  
Moisture Measurement ◽  
Safe Storage ◽  
Grain Moisture ◽  
Moisture Meter ◽  
Percent Moisture ◽  
New Crop ◽  
The U.S

The price paid for corn is usually based on 15.0 or 15.5 percent moisture content. However, corn must be dried below 13 percent moisture to ensure safe storage for a year or more. In the U.S., such stored corn cannot be directly remoistened before selling it, but it can be mixed with moist new-crop corn. Accurate moisture measurement of mixtures of dry and moist corn is important to permit adjustment of blending ratios to maximize profitability, but grain moisture meters are less accurate for mixtures of wet and dry grain. This research evaluated the differences between dielectric-type moisture meter results for mixed and equilibrated corn samples at different moisture levels and different measurement frequencies. Equilibrated grain samples tended to give lower moisture results than recently mixed grain samples - especially in the 1 to 10 MHz region. These differences permitted detection of mixtures by using moisture measurements at two frequencies.

Design and Modeling of MEMS-Based Trace-Level Moisture Measurement System for GIS Applications in Smart Grid Environment

2017 ◽  
Vol 17 (23) ◽  
pp. 7758-7766 ◽  
Author(s):  
Yashdeep ◽  
Gyan Ranjan Biswal ◽  
Tapas Choudhury ◽  
Tarikul Islam ◽  
Subhas Chandra Mukhopadhyay ◽  
...  
Keyword(s):  
Smart Grid ◽  
Measurement System ◽  
Trace Level ◽  
Grid Environment ◽  
Moisture Measurement ◽  
Gis Applications

Effectiveness of Modified 1-Hour Air-Oven Moisture Methods for Determining Popcorn Moisture

2018 ◽  
Vol 34 (3) ◽  
pp. 617-621
Author(s):  
Daniel Brabec ◽  
Mayra Perez-Fajardo ◽  
Hulya Dogan ◽  
Kathleen Yeater ◽  
Elizabeth Maghirang
Keyword(s):  
Reference Method ◽  
Heating Time ◽  
Whole Grain ◽  
Oven Method ◽  
Drying Time ◽  
Ground Sample ◽  
Moisture Measurement ◽  
Mesh Screen ◽  
Grain Moisture ◽  
Short Heating Time

Abstract. Two of the most commonly used approved grain moisture air-oven reference methods for corn are the air oven method ASAE S352.2, which requires long heating time (72 h) at 103 ± 1°C for unground samples, and the AACC 44-15.02 air-oven method, which dries a ground sample for 1 h at 130 ± 1°C, but there is specific moisture measurement method for popcorn. The AACC 44-15.02 recommends a two-stage drying method for grain over 13%. But this involves more handling and drying time. The objective of this study was to develop an air-oven procedure for popcorn that requires short heating time (1h or less) based on existing reference method for ground corn (AACC 44-15.02). In the process of procedure development, two laboratory mills (Wiley Mini-Mill and Perten 3303 Mill) were optimized for mesh screen size and mill gap settings. The approved AACC method recommends using a 20-mesh screen fitted to the Wiley Mill, which failed, with wires breaking during the grinding process, possibly due to the hard nature of popcorn and/or clogging. It was replaced with the 10-mesh screen which produced larger particle size distribution with ~73% greater than 840 µm. The Perten Mill 3303 was set to gap No. 3 which produced ~68% particles that were greater than 840 µm. Additionally, this study evaluated the effectiveness of single-stage moisture measurement with the 14.5% and 16% moisture popcorn samples. Using the proposed procedure, four varieties of popcorn were tested at three different moisture contents (13%, 14.5%, and 16%). The method using the Wiley grinder and 60 min. heating time yielded oven moisture values which were statistically (p<0.05) similar to the approved ASAE S352.2 and AACC 44-15.02 (72-h, whole grain method). The moisture content of ground samples obtained from the Perten 3303 Mill had elevated moisture measurements and bias across the moisture levels when dried for 60 min. A reduction in heating time to 50 min. resulted in Perten mill samples yielding statistically (p<0.05) similar moisture measurements with the reference 72-h, whole grain method. Keywords: Air-oven, Drying, Popcorn.

Measurement on the Dielectric Constant of Grass with Rectangular Waveguide at C Band

2011 ◽  
Vol 130-134 ◽  
pp. 2138-2142 ◽  
Author(s):  
Chun Lin Xian ◽  
Yan Chen ◽  
Ling Tong ◽  
Ming Quan Jia
Keyword(s):  
Dielectric Constant ◽  
Measurement Error ◽  
Moisture Content ◽  
Measurement System ◽  
Rectangular Waveguide ◽  
Microwave Measurement ◽  
Error Range ◽  
Constant Measurement ◽  
Standard Block ◽  
Dielectric Constant Measurement

This paper was developed by microwave measurement on the vegetation dielectric constant through using the rectangular-waveguide at C Band. The measurement system and the method of the measurement will be introduced in detail. We have a standard block of known dielectric constant measurement, and then evaluate the error range. The system of measurement error range is ± 5%.At last, the result of this experiment showed that different density corresponds to different dielectric constant in the case of certain moisture content, and the dielectric constant increases with the density.

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