Moisture content at harvest, is a key parameter that impacts quality and how well the agriculture crops can be stored without intensity before processing. It is also a key parameter of interest for harvest-time field trials as it can directly influence the quality of harvested crops as well as alter the results of quality assessment. Microwave sensing of moisture has several advantages over lower frequency sensing approaches.
Advantages of microwave sensing moisture:
There are many advantages of microwave sensing moisture,
- The first advantage is that microwaves are insensitive to variations in conductivity, due to the presence of salts or minerals
- The second advantage is that microwaves can equate the quality deep inside large bulk packing to assess the internal moisture content without performing a destructive disassembly of the package.
- The last advantage of microwave is that microwave sensing has been shown to provide a high-accuracy fast means to assess bulk moisture of the material.
Measure Moisture using the microwave:
before exploring the different methods to measure your microwave moisture level, here is something that is easy and convenient to use – the radwag moisture analyzers!
- Direct method
Direct methods are typically conducted in a laboratory setting as they generally require specific environmental conditions and specialized equipment. Direct methods include methods such as
The gravimetric method is a standard laboratory technique that is widely used in a variety of industries like food, construction, textile, agriculture, and chemicals. The moisture content is calculated based on the initial and final weights of the sample, which assumes that all weight loss is due to the removal of water. The sample preparation and drying conditions influence the efficiency of moisture removal and the resulting drying time required to complete a test can from hours to days.
2.Chemical method 1:
The Karl Fischer titration method is a standard laboratory technique used to measure moisture content in liquid and solids in construction, textile, and agriculture materials among others. Moisture content is determined with a check curve correlated to the volume of a substance. The sample is completely dissolved in a solution consisting of primary alcohol as the solvent, and a base as a buffering agent.
Optical measurement methods are most useful for measuring samples with the same nature surface, whereas rough surface or variations in color can result in an error. Another limitation is the penetration depth of the electromagnetic radiation, which is influenced by material absorption and reflection characteristics.
Infrared spectroscopy is one of the most common methods for remote sensing of moisture content in soils and for moisture measurement in a variety of biological samples, including food. This measurement method is popular due to the short measurement time.
The measurement principle is based on detecting the differences in the dry samples and wet samples. An IR camera detects thermal energy emitted by the surface of an object and transforms this into a visible temperature map of the surface.
Hyperspectral imaging has a useful method for non-destructive measurement and visualization of moisture content in food materials. It provides a basis to evaluate the drying method.
Measurement of direct current conductance is the basic principle for many types of moisture content measurement methods. Capacitance and resistive methods are widely used in pharmaceutical applications, soils, and grains. Moisture content is determined based on the variation in capacitance or resistivity of the dielectric properties of a material before and after drying.