Microwave water content measurement device and measurement method based on space traveling standing wave attenuation

A technology for measuring device and moisture content, which is applied in the field of microwave application, can solve problems such as limiting the practical application of microwave moisture content measuring device, inability to complete accurate measurement, affecting microwave attenuation and phase change measurement accuracy, and achieving high-precision non-destructive measurement and structure Simple, the effect of eliminating measurement errors

Active Publication Date: 2020-01-24
JILIN AGRICULTURAL UNIV
View PDF9 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing microwave free space transmission water content measurement technology requires the material thickness to have an attenuation of more than 10dB to reduce the multiple reflections of the microwave signal inside the sample. Accurate measurement cannot be completed when the sample thickness is thin or the water content is low.
At the same time, multiple reflections of the s...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Microwave water content measurement device and measurement method based on space traveling standing wave attenuation
  • Microwave water content measurement device and measurement method based on space traveling standing wave attenuation
  • Microwave water content measurement device and measurement method based on space traveling standing wave attenuation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Such as figure 1 As shown, a microwave water content measurement device based on space standing wave attenuation includes a microwave transmitting probe 1, a sample container 2, a material to be tested 3, a microwave receiving probe 4, a sliding platform 5, a screw guide unit 6, and a motor unit 7. Weight monitoring unit 8 and signal display control unit 9; wherein, the microwave transmitting probe 1 converts the DC voltage signal into a microwave signal, which is sent out in the horizontal direction by the horn antenna; the sample container 2 is located between the microwave transmitting probe 1 and the Between the microwave receiving probes 4 and placed on the weight monitoring unit 8; after the microwave interacts with the measured material 3, the transmitted microwave signal is received by the horn antenna of the microwave receiving probe 4; the microwave receiving probe 4 is fixedly installed on the screw guide rail On the sliding platform 5 of the unit 6; the moto...

Embodiment 2

[0053] In this embodiment, corn kernels are taken as an object to illustrate the specific measurement method of the device. The initial moisture content of the naturally air-dried corn was 7.44%. Five corn samples with different moisture contents were finally obtained by adding water to the samples and stirring continuously. The moisture content ranged from 7.44% to 24.20%.

[0054] A microwave water content measurement method based on space traveling standing wave attenuation, the specific steps are as follows:

[0055] S1. Transmission microwave no-load measurement;

[0056] The sample container 2 is empty, and the motor unit 7 is controlled by the signal display control unit 9 to rotate, so that the horn antenna port of the microwave receiving probe 4 is gradually moved away from the surface close to the sample container 2, and at the same time, the signal display control unit 9 controls the microwave receiving probe. The output detection voltage signal of 4 is continuousl...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention relates to a microwave water content measurement device and a measurement method based on space traveling standing wave attenuation, and belongs to the technical field of microwave applications. The device is composed of a microwave transmitting probe, a sample container, a measured material, a microwave receiving probe, a sliding platform, a lead screw guide rail unit, a motor unit,a weight monitoring unit and a signal display control unit. The sample container of the device is located between the microwave transmitting probe and the microwave receiving probe; the microwave receiving probe is fixed on the sliding platform of the lead screw guide rail unit, and can move freely in the horizontal direction to realize continuous measurement of space standing wave signals. The signal display control unit establishes a water content inversion formula based on the power attenuation of traveling wave antinodal points, and eliminates measurement errors caused by multiple reflection effects. The microwave water content measurement device based on the space traveling standing wave attenuation provided by the invention improves the measurement accuracy, makes a measurement result not affected by the material thickness and the bulk density, and can realize the fast, non-destructive measurement of the water content of granular materials such as grains, feeds, woods, gravels and the like.

Description

technical field [0001] The invention belongs to the technical field of microwave applications, and in particular relates to a microwave water content measurement device and a measurement method based on space traveling standing wave attenuation. Background technique [0002] In the process of industrial and agricultural production, moisture content has always been an important index for product quality evaluation. For example, in the links of grain storage, transportation, processing, etc., if the moisture content is too high, it will easily cause grain germination, mold, and it is not easy to store, while if it is too low, it will destroy the internal physical structure of the grain and reduce its nutritional value; Moisture content directly affects the molding strength of buildings; in the process of wood processing, in order to prevent bending or cracking of products, the range of moisture content needs to be strictly controlled. Therefore, realizing fast and high-precis...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N22/04
CPCG01N22/04
Inventor 李陈孝于小庭徐艳蕾宋乾丁文超马小华
Owner JILIN AGRICULTURAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap