CN112505069A - Device and method for improving precision of microwave measurement of moisture in waste paper package - Google Patents
Device and method for improving precision of microwave measurement of moisture in waste paper package Download PDFInfo
- Publication number
- CN112505069A CN112505069A CN202011195170.1A CN202011195170A CN112505069A CN 112505069 A CN112505069 A CN 112505069A CN 202011195170 A CN202011195170 A CN 202011195170A CN 112505069 A CN112505069 A CN 112505069A
- Authority
- CN
- China
- Prior art keywords
- moisture
- microwave
- transmitter
- measurement
- phase change
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
- G01N22/04—Investigating moisture content
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The device at least comprises a detection unit and a control terminal, wherein the detection unit at least comprises a transceiver, a communication control module and a microwave conversion module, the transceiver comprises a transmitter and a receiver, the transmitter at least comprises three frequency channels, a paper packet to be detected is arranged between the transmitter and the receiver, the communication control module is communicated with the control terminal, and the microwave conversion module controls channel switching according to an instruction of the communication control module; the receiver is matched with the transmitter to carry out detection and phase discrimination and output power attenuation values and phase change values of all channels, and the control terminal obtains moisture values of the detected paper packets according to the received power attenuation values and phase change values of all channels; the method adopts a multi-frequency correlation mode, combines energy attenuation and phase change, fuses multi-frequency measurement results through an intelligent algorithm, and realizes measurement of higher precision of paper package moisture measurement.
Description
Technical Field
The disclosure relates to the technical field of moisture measurement of paper bags, in particular to a device and a method for improving the precision of microwave measurement of moisture of waste paper bags.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The recycling of waste paper is the most important raw material source of paper in the world, and the settlement cost of waste paper recycling is the most important production cost of the paper making industry and the waste paper recycling industry. Therefore, the water content of the waste paper is one of the most important settlement indexes and is also the link with the most disputes and the most loopholes of the two parties of trade.
The inventor of the present disclosure finds that the traditional method for measuring the moisture of the wastepaper bag comprises a drying and weighing method, an infrared needling method and a 2.4GHz microwave measuring method. The drying and weighing method has high measurement precision, but the requirement of oven equipment is high, the power consumption is high, and the time consumption is long; the infrared insertion method can quickly obtain the moisture value, but only measures the local part, cannot represent the global part, and the insertion needle of the instrument is easy to break because the paper package is tightly bound.
The 2.4GHz microwave measurement method overcomes the problems, the package is not required to be unpacked, the measurement speed is high, and the average moisture of the paper package can be obtained, but the measurement method only considers the energy attenuation value of a microwave signal after the microwave signal passes through the water-containing paper package, and does not consider the phase change; the measurement is greatly influenced by environmental factors such as the compaction degree of the paper bag, the distance between the microwave antenna and the paper bag, the external temperature and humidity, the precision is low and generally about 5%, and the measurement requirement cannot be met.
Disclosure of Invention
In order to solve the defects of the prior art, the device and the method for improving the moisture precision of the waste paper bags measured by microwaves are provided by the utility model, a multi-frequency correlation mode is adopted, energy attenuation and phase change are combined, and multi-frequency measurement results are fused by an intelligent algorithm, so that the measurement with higher precision of the moisture measurement of the paper bags is realized.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
the first aspect of this disclosure provides a device that improves microwave measurement waste paper package moisture precision.
A device for improving the precision of microwave measurement of moisture in waste paper bags at least comprises a detection unit and a control terminal;
the detection unit at least comprises a transceiver, a communication control module and a microwave conversion module, wherein the transceiver comprises a transmitter and a receiver, the transmitter at least comprises three frequency channels, a paper package to be detected is arranged between the transmitter and the receiver, the communication control module is communicated with the control terminal, and the microwave conversion module controls channel switching according to an instruction of the communication control module;
the receiver is matched with the transmitter to detect and phase-discriminate and output the power attenuation value and the phase change value of each channel, and the control terminal obtains the moisture value of the detected paper packet according to the received power attenuation value and the phase change value of each channel.
As some possible implementations, the transmitter includes three channels corresponding to three frequencies, 1GHz, 2GHz, and 3GHz, respectively.
As some possible implementation manners, the system further comprises a receiving antenna, a transmitting antenna and a feeder line, wherein the receiving antenna and the transmitting antenna are respectively connected with the transmitter and the receiver through the feeder line.
As a further limitation, the receiving antenna and the transmitting antenna are both passive flat antennas, and the parameters of the two antennas are completely consistent.
By way of further limitation, the frequency range of both the receiving antenna and the transmitting antenna is 800M-3.5 GHz, and the angles in the horizontal and vertical directions are less than 20 °.
As a further limitation, the transmitter is connected with three antennas through microwave switches, and performs cyclic channel switching at a preset speed according to an instruction of the control terminal, and each channel transmits a different frequency signal.
The paper moisture content monitoring system further comprises a display module which is communicated with the control terminal and is configured to display the moisture content value and/or the working state of the tested paper in real time.
The second aspect of the disclosure provides a method for improving the precision of microwave measurement of moisture in waste paper bags.
A method for improving the accuracy of microwave measurement of moisture in waste paper bags, which utilizes the device of the first aspect of the disclosure, and comprises the following steps:
constructing a microwave energy attenuation database, a microwave phase change database, an antenna flatness database and a transmitter power correction database;
and receiving power attenuation and phase change values of each channel, utilizing a basic database to correct and compensate the received data, and adopting a linear regression algorithm and a convolutional neural network algorithm to synthesize the three-channel data to obtain a moisture value of the current paper packet.
As some possible implementation modes, the microwave energy attenuation database and the microwave phase change database are derived from attenuation and phase shift data of water on frequency signals of 1GHz, 2GHz and 3GHz, and the antenna flatness database is derived from measurement of a vector network analyzer.
As some possible implementation manners, a linear regression algorithm and a convolutional neural network algorithm are adopted to synthesize the three-channel data, specifically:
for the power attenuation and phase change value of each channel, correcting by a linear regression algorithm according to the loss and phase change value in a basic database, and respectively obtaining the moisture measurement results of three channels;
and then inputting the moisture values of all channels in the set measurement time period into a convolutional neural network system for synthesis according to different weighting coefficients to obtain the moisture value of the measured paper packet.
Compared with the prior art, the beneficial effect of this disclosure is:
1. according to the device and the method, a multi-frequency correlation mode is adopted, energy attenuation and phase change are combined, and multi-frequency measurement results are fused through an intelligent algorithm, so that higher-precision measurement of the moisture of the paper package is realized.
2. According to the device and the method, the basic database is arranged, the linear regression correction is carried out on the measured data of each channel, the accuracy of the measurement result of each channel is greatly improved, and the more accurate final measurement result can be obtained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic structural diagram of an apparatus for improving accuracy of microwave measurement of moisture in a wastepaper packet according to embodiment 1 of the present disclosure.
Fig. 2 is a schematic diagram of transceiver measurement provided in embodiment 1 of the present disclosure.
Fig. 3 is a schematic block diagram of a microwave transceiver provided in embodiment 1 of the present disclosure.
Fig. 4 is a block diagram of a radio frequency receiving module provided in embodiment 1 of the present disclosure.
Fig. 5 is a block diagram of a radio frequency transmission module provided in embodiment 1 of the present disclosure.
Fig. 6 is a schematic flow chart of a method for improving the accuracy of microwave measurement of moisture in a waste paper package according to embodiment 1 of the present disclosure.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
Example 1:
as shown in fig. 1, embodiment 1 of the present disclosure provides a device for improving the precision of microwave measurement of moisture in a waste paper package, and an intelligent algorithm is applied to improve the measurement precision by applying three-frequency correlation, detection energy attenuation and phase change.
Specifically, the system comprises a pair of transceivers, an auxiliary transceiver antenna, a feeder line and a main control computer (namely a control terminal).
The transceiver consists of a power supply, a transmitter, a receiver, a communication and control unit and a microwave conversion unit, the transceiver can be set in working modes, and a pair of transceivers are arranged on the left side and the right side of the paper bag and need to be switched simultaneously.
The power supply converts 220V alternating current into direct current 12V for the transmitter, the receiver, the communication and control unit and the microwave conversion unit.
The transmitter has three channels which respectively correspond to three frequencies of 1GHz, 2GHz and 3GHz, the power and the switching interval can be set, the setting is controlled by an upper computer control command, and the channels are automatically switched after success. The transmitted signal includes the current channel number, frequency and power value.
The receiver can set frequency and frequency switching intervals, is matched with another transceiver to complete the functions of detection and phase discrimination, and outputs power attenuation values and phase change values of all channels.
The communication and control unit consists of a network interface, a network transmission protocol, a user-defined protocol and a controller; and a UDP (user Datagram protocol) is used for transmitting data and commands with the upper computer, and the controller receives the commands and the data to form a communication bridge between the upper computer and the transceiver.
And the microwave conversion unit controls the microwave conversion switch to switch channels according to the instruction output by the controller.
The receiving and transmitting antenna is a passive flat antenna, the shape, the gain and other parameters of the receiving and transmitting antenna are completely consistent, and the receiving and transmitting antenna can be replaced with the passive flat antenna. The frequency range is 800M-3.5 GHz, and the angles in the horizontal direction and the vertical direction are both smaller than 20 degrees, so that the influence of the reflection and the scattering of electromagnetic waves on the measurement is reduced. And measuring the flatness curve of the antenna through a vector network analyzer, and establishing an antenna gain database.
The feeder line is connected with the antenna and the transceiver to realize the transmission of radio frequency signals, and a phase-stabilizing cable is used to reduce phase change.
The main control computer is connected with the transceiver through a network, and the running software on the computer comprises a basic database, communication software and data processing software.
The base database includes a microwave energy attenuation database, a microwave phase change database, an antenna flatness database, and a transmitter power correction database. The microwave energy attenuation database and the microwave phase change database are derived from attenuation and phase shift data of water on 1G, 2G and 3GHz frequency signals, and the antenna flatness database is derived from measurement of a vector network analyzer.
The communication software sends an instruction to the transceiver, synchronizes the working time of the transceiver, controls the switching time of the channel and controls the start and stop of the system. And receiving the power attenuation and phase change value of each channel. And processing by data processing software.
And the data processing software corrects and compensates the received power loss value and phase change value of each channel by using the basic database, and comprehensively and intelligently analyzes the three-channel data by adopting algorithms such as linear regression, neural convolution and the like to give a moisture value of the current paper packet.
More specifically, the following contents are included:
(1) transceiver
The microwave is commonly used in industry to measure the moisture of materials (such as waste paper, grain, tobacco shred and the like) by utilizing the microwave transmission and the attenuation characteristic of water to a specific microwave frequency band. The measurement principle is shown in fig. 2.
The microwave transmitter transmits microwave power signals, and the power values are received by the receiver after the microwave power signals are absorbed and attenuated by the materials and are used as key parameters for measuring the moisture of the materials.
The microwave transceiver integrates a transmitter and a receiver, the working mode can be set, the transmitter is connected with three antennas through microwave switch control, the cyclic channel switching is carried out at the speed of not more than 10ms (which can be set), each channel respectively transmits signals with different frequencies (carrier waves can be added and modulated), and the antennas with different frequencies are connected. The transmitting data is coded, and the coded information carries data such as channel number, frequency value, time identification, transmitting power value and transmitting frame number.
The three input ports of the receiver respectively correspondingly receive the transmitting signals of the three transmitting antennas (the transceiver should synchronously switch channels to ensure that the transmitting antennas correspond to the receiving antennas), the receiving power value is detected and measured, and information such as relative time, channel number, frequency, power attenuation value and the like is output. The receiver detects and receives the output energy by adopting technical measures to ensure that the main lobe signal of the antenna is received, and the interference of diffraction or reflection signals is reduced.
The two transceiver mechanisms form a system, the transceiver works in a simplex mode, and the transmitting mode and the receiving mode can be set by a program.
And a power detection port is reserved, and microwave power calibration measurement can be performed.
The main functions of the microwave transceiver include:
1) any one device can be used as a transmitter or a receiver through setting; 2) the connecting antenna can form a complete set of microwave receiving and transmitting system; 3) parameters such as transmitting power, frequency, switching time and the like are adjustable; the starting and stopping are controllable; 4) coding and outputting information such as relative time, channel number, frequency, transmitting power value, receiving power or attenuation value, frame number and the like; 5) three-channel input and output; 6) the power measurement interface is arranged, and microwave power calibration measurement can be carried out; 7) the device has a working state indicating function.
(2) Main technical requirements and indexes (or parameters) of equipment
a) Working environment
The working temperature is-40 ℃ to 70 ℃; relative humidity of 5-90%; the installation position is 500 meters away, and the mobile signal tower cannot be influenced mutually; waterproof grade: IP 67.
b) Frequency index
The working frequency range is 800 MHz-3.5 GHz, the emission frequency point can be set, the frequency setting interval is no more than 10 Mhz; channel 1: 800 MHz-1500 MHz; and (3) a channel 2: 1500 MHz-2500 MHz; and (3) passage: 2500 MHz-3500 MHz.
c) Output power: not less than 33 +/-3 dBm.
d) Power supply: 12V, the power consumption is no more than 20 w.
e) Channel switching time: 10ms ≦ (default 10ms, settable).
f) Maximum input range of receiving port: not less than 10 dbm.
g) Reception sensitivity: -126 dBm.
h) A communication interface: ethernet, UDP, the connector should choose the waterproof device of quick-release with reliable quality.
j) A radio frequency interface: an N-type female head.
k) The communication protocol is as follows: with reference to appendix 1: communication protocol (tentative).
l) output requirement: it should be possible to encode and output information such as relative time, channel number, frequency, transmit power, receive power or attenuation value, frame number, etc.
m) self-test requirement: the equipment has a board card and software function self-detection function.
n) size and weight: the external dimension is as follows: no more than 200 × 150 × 80 mm; weight: not more than 2 kg.
The schematic block diagram of the microwave transceiver is shown in fig. 3, and the microwave transceiver is divided according to functional modules, and mainly comprises 6 parts:
1) external interface module: and 1-path RS232 and 1-path network port external communication interfaces are provided.
2) A data processing module: mainly completes the radio frequency digital filtering, shaping, modulation and demodulation and the coding and decoding of the baseband.
3) A radio frequency receiving channel: and finishing the filtering, the amplification and the frequency conversion receiving of the microwave radio frequency signal.
4) Radio frequency transmission channel: and frequency conversion, filtering and amplification of the microwave radio frequency signal are completed.
5) A clock generation module: and providing fixed local oscillator and variable local oscillator clock sources of radio frequency receiving and transmitting channels.
6) A power supply module: providing power to the on-board active devices.
(1.1) receiver
As shown in fig. 4, the received rf signal enters the low-pass filtering unit from the rf port of the module to filter the input signal, filter high-end interference, amplify the signal by the low-noise amplifier, send the amplified signal to the band-pass filter through the 1-out-of-9 switch to perform preselection filtering, and enter the first-stage mixer to generate an intermediate frequency of 375MHz after filtering. The signal is amplified by an intermediate frequency amplifier and then sent to a 375Mhz sound meter filter for filtering, then enters a secondary mixer after passing through a variable attenuator, is mixed with a fixed local oscillator to generate a secondary intermediate frequency of 25MHz, is filtered by a two-stage intermediate frequency amplifier and a sound meter filter, is sent to an intermediate frequency variable gain amplifier, is sent to an ADC for analog-to-digital conversion, and is sent to a rear-stage FPGA for data signal processing.
(1.2) transmitter
As shown in fig. 5, the data processing unit is sent to the DAC for digital-to-analog conversion to generate a two-if analog signal of 25MHz, and after filtering and amplifying the image frequency by the reconstruction filter, the two-if analog signal is mixed with a two-if local oscillator signal to generate a 375MHz one-if signal. An intermediate frequency signal is amplified and filtered, then is sent to a local oscillator through a variable attenuator, generates 1-5G radio frequency signals through frequency mixing, is sent to a band-pass filter bank through a low-pass filter for filtering and amplifying, filters frequency mixing products, is amplified through a power amplifier, filters harmonic waves through a low-pass filter, then is reflected through an isolator isolation antenna, and is sent to an antenna through a switch selected from 3 for transmitting.
Main device type selection:
DAC: AD9957, 14bit, 1 Gbps; a reconstruction filter: 5 th order elliptic function low pass filter, 3dB bandwidth: 25MHz and a cut-off frequency of 50 MHz.
(2) Antenna with a shield
(2.1) emission:
a panel antenna: 1 pair; bandwidth: 4 GHz; vertical angle: 10-20 degrees; horizontal angle: less than 10 degrees; gain: more than 10 dBi; 250mm 200mm 150mm (width length height).
(2.2) receiving:
a panel antenna: 1 pair; vertical angle: 10-20 degrees; horizontal angle: less than 10 degrees; gain: > 10 dB.
The specific moisture test method for paper bags is shown in fig. 6.
The main control computer software mainly comprises four modules: the system comprises a control module, a data receiving module, an intelligent algorithm module and a visualization module.
The control module completes communication with the transceiver, and realizes functions of channel setting, power frequency adjustment, starting and stopping test, transceiver conversion test and the like of the transceiver.
The data receiving module receives the working state parameters and the test data of the transceiver in real time and transmits the working state parameters and the test data to the intelligent resolving module for resolving the data.
And the intelligent algorithm module performs linear regression algorithm correction on the input channel data by contrasting with the loss and phase change value in the basic database to respectively obtain three-channel measured moisture, and then inputs the moisture values of the channels in a set measurement time period into a convolutional neural network system for synthesis according to different weighting coefficients to obtain the moisture value of the measured paper packet.
And the visualization module is used for visually displaying the paper-in-paper moisture value and other working state information to a user according to the algorithm output result.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A device for improving the precision of microwave measurement of moisture in waste paper bags is characterized by at least comprising a detection unit and a control terminal;
the detection unit at least comprises a transceiver, a communication control module and a microwave conversion module, wherein the transceiver comprises a transmitter and a receiver, the transmitter at least comprises three frequency channels, a paper package to be detected is arranged between the transmitter and the receiver, the communication control module is communicated with the control terminal, and the microwave conversion module controls channel switching according to an instruction of the communication control module;
the receiver is matched with the transmitter to detect and phase-discriminate and output the power attenuation value and the phase change value of each channel, and the control terminal obtains the moisture value of the detected paper packet according to the received power attenuation value and the phase change value of each channel.
2. The apparatus for improving the accuracy of microwave measurement of moisture in wastepaper packets according to claim 1, wherein said transmitter comprises three channels corresponding to three frequencies of 1GHz, 2GHz and 3GHz, respectively.
3. The apparatus for improving the accuracy of microwave measurement of moisture in wastepaper packets according to claim 1, further comprising a receiving antenna, a transmitting antenna and a feeder line, the receiving antenna and the transmitting antenna being connected to the transmitter and the receiver by the feeder line, respectively.
4. The apparatus for improving the accuracy of microwave measurement of moisture in wastepaper bags according to claim 3, wherein the receiving antenna and the transmitting antenna are passive plate antennas, and the parameters of both are identical.
5. The apparatus for improving the accuracy of microwave measurement of moisture in wastepaper bags according to claim 3, wherein the frequency range of each of the receiving antenna and the transmitting antenna is 800M to 3.5GHz, and the horizontal and vertical direction angles are less than 20 °.
6. The apparatus for improving the accuracy of microwave measurement of moisture in wastepaper packets as claimed in claim 3, wherein the transmitter is connected to three antennas through a microwave switch, and the switching of the circulation path is performed at a predetermined speed in accordance with the instruction from the control terminal, and each path transmits a signal of a different frequency.
7. The apparatus for improving the accuracy of microwave measurement of moisture in waste paper bags according to claim 1, further comprising a display module in communication with the control terminal and configured to display the moisture value and/or the operation status of the paper bag under test in real time.
8. A method for improving the accuracy of microwave measurement of moisture in wastepaper packets, characterized in that the apparatus of any one of claims 1 to 7 is used, comprising the steps of:
constructing a microwave energy attenuation database, a microwave phase change database, an antenna flatness database and a transmitter power correction database;
and receiving power attenuation and phase change values of each channel, utilizing a basic database to correct and compensate the received data, and adopting a linear regression algorithm and a convolutional neural network algorithm to synthesize the three-channel data to obtain a moisture value of the current paper packet.
9. The method for improving the moisture precision of the wastepaper packets measured by microwaves as claimed in claim 8, wherein the microwave energy attenuation database and the microwave phase change database are derived from the attenuation and phase shift data of water to frequency signals of 1GHz, 2GHz and 3GHz, and the antenna flatness database is derived from the measurement of a vector network analyzer.
10. The method for improving the moisture precision of the waste paper package measured by microwaves as claimed in claim 8, wherein a linear regression algorithm and a convolutional neural network algorithm are adopted to synthesize three-channel data, and specifically:
for the power attenuation and phase change value of each channel, correcting by a linear regression algorithm according to the loss and phase change value in a basic database, and respectively obtaining the moisture measurement results of three channels;
and inputting the moisture values of all channels in the set measurement time period into a convolutional neural network system for synthesis according to different weighting coefficients to obtain the moisture value of the measured paper packet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011195170.1A CN112505069A (en) | 2020-10-30 | 2020-10-30 | Device and method for improving precision of microwave measurement of moisture in waste paper package |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011195170.1A CN112505069A (en) | 2020-10-30 | 2020-10-30 | Device and method for improving precision of microwave measurement of moisture in waste paper package |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112505069A true CN112505069A (en) | 2021-03-16 |
Family
ID=74954698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011195170.1A Pending CN112505069A (en) | 2020-10-30 | 2020-10-30 | Device and method for improving precision of microwave measurement of moisture in waste paper package |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112505069A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504251A (en) * | 2021-08-13 | 2021-10-15 | 河南工业大学 | Grain moisture rapid detection method and system based on radio frequency signals |
| CN113884512A (en) * | 2021-10-28 | 2022-01-04 | 山东瑞中智能科技有限公司 | Waste paper water content detecting system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110093212A1 (en) * | 2007-08-28 | 2011-04-21 | Tews Electronik Dipl. Ing. Manfred Tews | Method and device for measuring a moisture value of dielectric materials |
| CN105572150A (en) * | 2014-10-16 | 2016-05-11 | 航天信息股份有限公司 | Dual-channel grain moisture measuring method and device based on spread spectrum |
| CN106997040A (en) * | 2016-12-19 | 2017-08-01 | 四川九洲电器集团有限责任公司 | A kind of L-band radar signal receiving device and method |
| CN107271457A (en) * | 2017-06-05 | 2017-10-20 | 默斯测控技术（长沙）有限公司 | Multiple spectra microwave hydro analysis method, device and drimeter |
-
2020
- 2020-10-30 CN CN202011195170.1A patent/CN112505069A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110093212A1 (en) * | 2007-08-28 | 2011-04-21 | Tews Electronik Dipl. Ing. Manfred Tews | Method and device for measuring a moisture value of dielectric materials |
| CN105572150A (en) * | 2014-10-16 | 2016-05-11 | 航天信息股份有限公司 | Dual-channel grain moisture measuring method and device based on spread spectrum |
| CN106997040A (en) * | 2016-12-19 | 2017-08-01 | 四川九洲电器集团有限责任公司 | A kind of L-band radar signal receiving device and method |
| CN107271457A (en) * | 2017-06-05 | 2017-10-20 | 默斯测控技术（长沙）有限公司 | Multiple spectra microwave hydro analysis method, device and drimeter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504251A (en) * | 2021-08-13 | 2021-10-15 | 河南工业大学 | Grain moisture rapid detection method and system based on radio frequency signals |
| CN113884512A (en) * | 2021-10-28 | 2022-01-04 | 山东瑞中智能科技有限公司 | Waste paper water content detecting system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104967494B (en) | A kind of test method, equipment and system | |
| CN112505069A (en) | Device and method for improving precision of microwave measurement of moisture in waste paper package | |
| AU671342B2 (en) | Arrangement for measuring the condition of a receiver antenna | |
| CN103138845B (en) | Amplitude phase characteristic test method for down-conversion reception channel of ultra-wide band synthetic aperture radar (SAR) receiver | |
| CN106226741B (en) | The method and system of intermediate frequency controllable signal is obtained using TR components | |
| CN108777585A (en) | The device and method of passive intermodulation signal in a kind of adaptive cancellation wireless transceiver system | |
| CN105281850A (en) | Handheld radio comprehensive tester | |
| CN114720952B (en) | Multi-frequency-band weather radar full-link remote calibration system | |
| CN211046941U (en) | Radio frequency performance test system | |
| CN1157966C (en) | Coupling calibration network and method for intelligent antenna array of radio communication system | |
| CN111596266B (en) | Radio frequency front end of unmanned aerial vehicle C wave band radar is surveyed to low cost | |
| CN105577294A (en) | Multifunctional handheld passive intermodulation analyzer | |
| CN113242098A (en) | Radio frequency performance test system and method | |
| CN113612553B (en) | Receiver radio frequency link nonlinear effect multi-parameter test platform | |
| CN105763208B (en) | A kind of method and system of tuning optimization aerial signal | |
| CN102306266B (en) | Simulator for radio frequency identification | |
| CN205071007U (en) | Handheld radio comprehensive tester | |
| CN210867684U (en) | Multi-target real-time remote measuring system | |
| CN210778990U (en) | Quasi-plane wave generator based on dual-polarized antenna | |
| CN111679253A (en) | Millimeter wave radar test system and method thereof | |
| CN104242966B (en) | Noise cancellation method and noise elimination apparatus | |
| CN104569925A (en) | Multi-functional wideband receiving and transmitting channel | |
| CN106301625B (en) | A kind of antenna feeder test and arrangements for analyzing frequency | |
| CN210609159U (en) | 5G terminal signal transmitting and receiving device and terminal | |
| CN107831373A (en) | A kind of semi physical of heavy caliber net-shape antenna passive intermodulation power density determines method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |