CN118518686B - System and method for detecting water content of wooden relics based on immovable relics - Google Patents
System and method for detecting water content of wooden relics based on immovable relics Download PDFInfo
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Abstract
The invention discloses a system and a method for detecting the moisture content of a wooden cultural relic based on an immovable cultural relic, which relate to the technical field of moisture content detection, wherein a target cultural relic is monitored in real time in a temperature monitoring mode, and is subjected to primary abnormal judgment according to temperature information, so that the condition of the cultural relic can be timely found when the state of the cultural relic changes, if the primary abnormal judgment result is abnormal, the moisture content of the target cultural relic is detected through microwaves, and the quick response mechanism is beneficial to reducing the damage risk of the cultural relic caused by delay. By acquiring the material and thickness of the coating on the surface of the target area of the target cultural relics, the detection signal of the microwaves is corrected, and the influence of the coating on the detection signal is eliminated, so that the accuracy of microwave detection is improved.
Description
Technical Field
The invention relates to the technical field of water content detection, in particular to a system and a method for detecting the water content of wooden cultural relics based on immovable cultural relics.
Background
The immovable cultural relics are used as important components of human cultural heritage and bear rich historical information and unique artistic value. The wooden relics become an important member of the immovable relics by unique materials and processes. However, since wooden relics are exposed to natural environments for a long period of time, their moisture content may be affected by various factors. Too high or too low water content may have adverse effects on the preservation state and service life of the wooden relics, and therefore accurate detection of the water content of the wooden relics is very important for protecting the relics.
For the detection of the moisture content of wooden relics, the application of nondestructive detection technology is increasingly paid attention to. Common nondestructive testing methods include resistance, microwave, and radiation methods. Although the method can meet the requirement of detecting the moisture content of the cultural relics to a certain extent, periodic detection is needed by manpower at present. In this way, a lot of manpower and time are consumed, the detection period is long, and if the moisture content of the cultural relics exceeds the safety range due to the change of factors such as ambient humidity and temperature, the cultural relics cannot be found and protected in time, so that the service life of the cultural relics is seriously affected. And in order to protect the wooden relics, one or more layers of protective coatings are coated on the surfaces of the relics. These coatings can affect the detection accuracy of existing non-destructive detection techniques, thereby reducing the accuracy of the measurement results.
Disclosure of Invention
The invention aims to solve the problems of untimely detection and low accuracy in the background art, and provides a system and a method for detecting the moisture content of wooden relics based on immovable relics.
According to a first aspect of the invention, a method for detecting the water content of a wooden relic based on an immovable relic is provided, and the method comprises the following steps:
monitoring a target area of a target cultural relic in real time, and acquiring temperature information of the target area;
Performing primary abnormality judgment on the target cultural relics according to the temperature information, wherein the primary abnormality judgment result comprises normal and abnormal;
If the primary abnormality judgment result is abnormal, acquiring the material and thickness of the surface coating of the target area;
Transmitting target microwaves to the target area, and receiving microwave attenuation signals of the target microwaves after penetrating through the target area;
Obtaining a target water content according to the microwave attenuation signal and the material and thickness of the surface coating of the target area;
and carrying out secondary abnormality judgment on the target cultural relics according to the target water content.
Optionally, the temperature information includes an infrared thermal imaging image, and the performing an anomaly determination on the target cultural relic according to the temperature information includes:
Taking the infrared thermal imaging image as input of a pre-trained neural network model to obtain a first water content of the target area;
if the first water content exceeds a first preset range, judging that the target cultural relics are abnormal, otherwise, judging that the target cultural relics are normal.
Optionally, the obtaining the material and thickness of the surface coating of the target area includes:
Inquiring maintenance records, and extracting the material type of the surface coating of the target area;
determining parameters of the target ultrasonic wave according to the material type of the surface coating of the target area, wherein the parameters comprise the frequency, the power and the pulse width of the target ultrasonic wave;
Transmitting a target ultrasonic wave to the target area according to the parameters, and receiving a echo signal;
and determining the thickness of the surface coating of the target area according to the echo signals.
Optionally, the transmitting the target microwave to the target area and receiving the microwave attenuation signal after the target microwave penetrates through the target area includes:
inquiring a measurement record, and acquiring the latest water content measurement information of the target area as original water content information;
Determining the transmitting power of the target microwave according to the material and thickness of the surface coating of the target area and the original moisture content information;
And transmitting the target microwaves to the target area according to the transmitting power.
Optionally, the obtaining the target water content according to the microwave attenuation signal and the material and thickness of the surface coating of the target area includes:
Converting the microwave attenuation signal into an electric signal, and amplifying and filtering the electric signal to obtain a target signal;
calculating an energy attenuation value and a phase offset of the target microwave according to the target signal;
correcting the energy attenuation value and the phase offset according to the material and the thickness of the surface coating of the target area to obtain a target attenuation value and a target offset;
And obtaining the target water content according to the target attenuation value and the target offset.
According to a second aspect of the invention, a system for detecting the water content of a wooden relic based on an immovable relic is provided, and comprises:
the temperature information acquisition module is used for monitoring a target area of a target cultural relic in real time and acquiring temperature information of the target area;
The primary judging module is used for carrying out primary abnormality judgment on the target cultural relics according to the temperature information, wherein the primary abnormality judgment result comprises normal and abnormal;
The coating information acquisition module is used for acquiring the material and thickness of the surface coating of the target area if the primary abnormality judgment result is abnormal;
the microwave transmitting module is used for transmitting target microwaves to the target area and receiving microwave attenuation signals of the target microwaves after penetrating through the target area;
The water content detection module is used for obtaining target water content according to the microwave attenuation signal and the material and thickness of the surface coating of the target area;
And the secondary judgment module is used for carrying out secondary abnormality judgment on the target cultural relics according to the target water content.
Optionally, the temperature information comprises an infrared thermal imaging image, and the primary judging module comprises:
the fuzzy water content calculation module is used for taking the infrared thermal imaging image as input of a pre-trained neural network model to obtain a first water content of the target area;
And the primary abnormality judgment module is used for judging that the target cultural relics are abnormal if the first water content exceeds a first preset range, and judging that the target cultural relics are normal if the first water content exceeds the first preset range.
Optionally, the coating information obtaining module includes:
the coating material acquisition module is used for inquiring maintenance records and extracting the material type of the surface coating of the target area;
The sound wave parameter determining module is used for determining parameters of the target ultrasonic wave according to the material type of the surface coating of the target area, wherein the parameters comprise the frequency, the power and the pulse width of the target ultrasonic wave;
The sound wave signal generation module is used for transmitting target ultrasonic waves to the target area according to the parameters and receiving echo signals;
And the coating thickness determining module is used for determining the thickness of the surface coating of the target area according to the echo signals.
Optionally, the microwave emission module includes:
the water content prediction module is used for inquiring the measurement record and acquiring the latest water content measurement information of the target area as original water content information;
The microwave parameter determining module is used for determining the transmitting power of the target microwaves according to the material and thickness of the surface coating of the target area and the original water content information;
and the microwave generation module is used for transmitting the target microwaves to the target area according to the transmitting power.
Optionally, the water content detection module includes:
the signal preprocessing module is used for converting the microwave attenuation signal into an electric signal, and amplifying and filtering the electric signal to obtain a target signal;
The change amount calculation module is used for calculating the energy attenuation value and the phase offset of the target microwave according to the target signal;
the variation correction module is used for correcting the energy attenuation value and the phase offset according to the material and the thickness of the surface coating of the target area to obtain a target attenuation value and a target offset;
And the target water content determining module is used for obtaining the target water content according to the target attenuation value and the target offset.
The invention has the beneficial effects that:
The invention provides a method for detecting the moisture content of a wooden cultural relic based on an immovable cultural relic, which comprises the steps of monitoring a target area of the target cultural relic in real time, obtaining temperature information of the target area, carrying out primary abnormality judgment on the target cultural relic according to the temperature information, obtaining the material and the thickness of a surface coating of the target area if the primary abnormality judgment result is abnormal, transmitting target microwaves to the target area, receiving microwave attenuation signals after the target microwaves penetrate through the target area, obtaining the target moisture content according to the microwave attenuation signals and the material and the thickness of the surface coating of the target area, and carrying out secondary abnormality judgment on the target cultural relic according to the target moisture content.
The method is characterized in that a target cultural relic is monitored in real time in a temperature monitoring mode, the condition of the cultural relic can be timely found when the condition of the cultural relic changes, the accurate water content is obtained through microwave measurement, the rapid response mechanism is beneficial to reducing the damage risk of the cultural relic caused by delay, and the detection signal of microwaves is corrected by obtaining the material and the thickness of the coating on the surface of the cultural relic, so that the influence of the coating on the detection signal is eliminated, and the accuracy of microwave detection is improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method for detecting the water content of a wooden relic based on an immovable relic, according to an embodiment of the invention;
Fig. 2 is a schematic diagram of a system for detecting the moisture content of a wooden relic based on an immovable relic according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a method for detecting the water content of a wooden cultural relic based on an immovable cultural relic. Referring to fig. 1, fig. 1 is a flowchart of a method for detecting the moisture content of a wooden relic based on an immovable relic according to an embodiment of the present invention. The method comprises the following steps:
s101, monitoring a target area of a target cultural relic in real time, and acquiring temperature information of the target area.
S102, performing one-time abnormality judgment on the target cultural relics according to the temperature information.
And S103, if the result of one abnormal judgment is abnormal, acquiring the material and thickness of the surface coating of the target area.
S104, transmitting target microwaves to the target area, and receiving microwave attenuation signals after the target microwaves penetrate through the target area.
S105, obtaining the target water content according to the microwave attenuation signal and the material and thickness of the surface coating of the target area.
S106, performing secondary abnormality judgment on the target cultural relics according to the target water content.
Wherein, the result of one abnormality judgment includes normal and abnormal.
According to the method for detecting the moisture content of the wooden relics based on the immovable relics, provided by the embodiment of the invention, the target relics are monitored in real time in a temperature monitoring mode, so that the states of the relics can be timely found out when the states of the relics change, the accurate moisture content is obtained through microwave measurement, the rapid response mechanism is helpful for reducing the damage risk of the relics caused by delay, and the detection signals of microwaves are corrected by acquiring the material and the thickness of the coating on the surface of the relics, so that the influence of the coating on the detection signals is eliminated, and the accuracy of microwave detection is improved.
In one implementation, the target cultural relic may have a plurality of detection areas, and the target area is any one of the plurality of detection areas.
In one implementation, the method can detect the water content of the target cultural relics periodically by a microwave method, and can detect the cultural relics according to abnormal responses.
In one implementation, the secondary anomaly determination is performed on the target cultural relics according to the target water content. If the target water content exceeds the second preset range, judging that the target cultural relics are abnormal, and sending alarm information to maintenance personnel. The second preset range is determined by the specific wood species and protection requirements of the relics. The second preset range may be given by a skilled person based on experience with the protection of the cultural relics.
In one embodiment, the temperature information comprises an infrared thermographic image, and step S102 comprises:
and step one, taking the infrared thermal imaging image as input of a pre-trained neural network model to obtain a first water content of a target area.
And step two, if the first water content exceeds a first preset range, judging that the target cultural relics are abnormal, and if not, judging that the target cultural relics are normal.
In one implementation, moisture in the wood absorbs thermal radiation and the presence of moisture affects the temperature distribution at the wood surface. These temperature differences can be captured by a thermal infrared imager and converted into a visual thermographic image. The convolutional neural network can be trained to rapidly and accurately extract the characteristic information about the water content in the image, so that the water content in the wood is obtained. The infrared thermal imaging measurement of the water content is rapid and convenient, and can continuously detect the target cultural relics without damaging the cultural relics, so that the real-time monitoring of the cultural relics can be realized. But the accuracy is lower, and the method is only suitable for the early-stage fuzzy detection, and when the method judges that the target cultural relics are abnormal, a more accurate measuring method can be called in time.
In one implementation, the first predetermined range is related to training results of the neural network model. And obtaining the error range of the neural network according to the performance of the neural network in the test set. And obtaining a first preset range according to the water content early warning range given by the professional technician. For example, if the protection requirement of an ancient building shows that the water content should be between 10% and 15%, and the error range of the neural network model is about ±1%, the first preset range may be set to 11% to 14%.
In one embodiment, step S103 includes:
inquiring maintenance records, and extracting the material type of the surface coating of the target area.
And step two, determining parameters of the target ultrasonic waves according to the material types of the surface coating of the target area.
And thirdly, transmitting target ultrasonic waves to a target area according to the parameters, and receiving echo signals.
And step four, determining the thickness of the surface coating of the target area according to the echo signals.
Wherein the parameters include the frequency, power and pulse width of the target ultrasound wave.
In one implementation, non-contact measurement of the coating can be achieved by ultrasonically measuring the thickness of the coating without damaging the coating on the surface of the cultural relic.
In one implementation mode, the physical and chemical characteristics of the coating can be accurately known by inquiring the maintenance record and extracting the material type of the coating on the surface of the target area, and parameters of the target ultrasonic wave including frequency, power and pulse width are determined according to the material type of the coating, so that the interaction between the ultrasonic wave and the coating can be ensured to reach the optimal state, and the cultural relics can not be damaged.
In one embodiment, step S104 includes:
Step one, inquiring a measurement record, and acquiring the latest water content measurement information of a target area as original water content information.
And step two, determining the transmitting power of the target microwaves according to the material and thickness of the surface coating of the target area and the original moisture content information.
And thirdly, transmitting target microwaves to a target area according to the transmitting power.
In one implementation, the microwave method can realize non-contact water content measurement without damage to cultural relics.
In one implementation, the last moisture content measurement information may be the moisture content of the last microwave detection or the moisture content of the last infrared detection.
In one implementation, the emission power of the target microwave is determined according to the material and thickness of the surface coating of the target area and the original moisture content information. The absorption and reflection properties of the coating layers of different materials and thicknesses for microwaves are different, so that the transmission power of the microwaves needs to be adjusted according to the actual situation to ensure that the microwaves can penetrate the coating layers and effectively interact with the water in the wood. At the same time, considering the original moisture content information also helps to more accurately predict the propagation and attenuation of microwaves in wood, thereby ensuring that the microwaves penetrate the target region.
In one embodiment, step S105 includes:
Step one, converting a microwave attenuation signal into an electric signal, and amplifying and filtering the electric signal to obtain a target signal.
And step two, calculating the energy attenuation value and the phase offset of the target microwave according to the target signal.
And thirdly, correcting the energy attenuation value and the phase offset according to the material and the thickness of the surface coating of the target area to obtain a target attenuation value and a target offset.
And step four, obtaining the target water content according to the target attenuation value and the target offset.
In one implementation, the microwave attenuation signal is converted into an electric signal, and the electric signal is amplified and filtered, so that noise and interference in the signal can be eliminated, and the signal-to-noise ratio of the signal can be improved. This helps to more accurately extract information related to the target water cut, providing a reliable data basis for subsequent calculations and analysis.
In one implementation, the energy attenuation values and phase offsets are modified to take into account the effects of the material and thickness of the target area surface coating on microwave propagation. The method can eliminate the influence of the coating on the measurement result, so that the obtained water content data is more accurate and reliable.
In one implementation, a mathematical model may be determined from experimental data. The mathematical model can map to obtain the target water content according to the corrected energy attenuation value and the phase offset.
The embodiment of the invention provides a system for detecting the water content of a wooden cultural relic based on an immovable cultural relic. Referring to fig. 2, fig. 2 is a schematic diagram of a system for detecting the moisture content of a wooden relic based on an immovable relic according to an embodiment of the present invention. The system comprises:
The temperature information acquisition module is used for monitoring the target area of the target cultural relics in real time and acquiring the temperature information of the target area.
And the primary judging module is used for carrying out primary abnormality judgment on the target cultural relics according to the temperature information.
And the coating information acquisition module is used for acquiring the material and thickness of the surface coating of the target area if the result of one abnormal judgment is abnormal.
And the microwave transmitting module is used for transmitting target microwaves to the target area and receiving microwave attenuation signals after the target microwaves penetrate through the target area.
The water content detection module is used for obtaining the target water content according to the microwave attenuation signal and the material and thickness of the surface coating of the target area.
And the secondary judgment module is used for carrying out secondary abnormality judgment on the target cultural relics according to the target water content.
Wherein, the result of one abnormality judgment includes normal and abnormal.
According to the method for detecting the moisture content of the wooden relics based on the immovable relics, provided by the embodiment of the invention, the target relics are monitored in real time in a temperature monitoring mode, so that the states of the relics can be timely found out when the states of the relics change, the accurate moisture content is obtained through microwave measurement, the rapid response mechanism is helpful for reducing the damage risk of the relics caused by delay, and the detection signals of microwaves are corrected by acquiring the material and the thickness of the coating on the surface of the relics, so that the influence of the coating on the detection signals is eliminated, and the accuracy of microwave detection is improved.
In one embodiment, the temperature information comprises an infrared thermographic image and the primary judgment module comprises:
and the fuzzy water content calculation module is used for taking the infrared thermal imaging image as the input of the pre-trained neural network model to obtain the first water content of the target area.
The primary abnormality judgment module is used for judging that the target cultural relics are abnormal if the first water content exceeds a first preset range, and judging that the target cultural relics are normal if the first water content exceeds the first preset range.
In one embodiment, the coating information acquisition module includes:
And the coating material acquisition module is used for inquiring the maintenance record and extracting the material type of the surface coating of the target area.
And the sound wave parameter determining module is used for determining parameters of the target ultrasonic wave according to the material type of the surface coating of the target area, wherein the parameters comprise the frequency, the power and the pulse width of the target ultrasonic wave.
And the sound wave signal generation module is used for transmitting target ultrasonic waves to the target area according to the parameters and receiving echo signals.
And the coating thickness determining module is used for determining the thickness of the surface coating of the target area according to the echo signals.
In one embodiment, a microwave transmission module includes:
the water content prediction module is used for inquiring the measurement record and acquiring the latest water content measurement information of the target area as the original water content information.
And the microwave parameter determining module is used for determining the transmitting power of the target microwaves according to the material and thickness of the surface coating of the target area and the original moisture content information.
And the microwave generation module is used for transmitting target microwaves to a target area according to the transmitting power.
In one embodiment, the water cut detection module includes:
And the signal preprocessing module is used for converting the microwave attenuation signal into an electric signal, and amplifying and filtering the electric signal to obtain a target signal.
And the change amount calculation module is used for calculating the energy attenuation value and the phase offset of the target microwave according to the target signal.
And the variation correction module is used for correcting the energy attenuation value and the phase offset according to the material and the thickness of the surface coating of the target area to obtain a target attenuation value and a target offset.
And the target water content determining module is used for obtaining the target water content according to the target attenuation value and the target offset.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (6)
1. The method for detecting the water content of the wooden relics based on the immovable relics is characterized by comprising the following steps of:
monitoring a target area of a target cultural relic in real time, and acquiring temperature information of the target area;
Performing primary abnormality judgment on the target cultural relics according to the temperature information, wherein the primary abnormality judgment result comprises normal and abnormal;
If the primary abnormality judgment result is abnormal, acquiring the material and thickness of the surface coating of the target area;
Transmitting target microwaves to the target area, and receiving microwave attenuation signals of the target microwaves after penetrating through the target area;
Obtaining a target water content according to the microwave attenuation signal and the material and thickness of the surface coating of the target area;
performing secondary abnormality judgment on the target cultural relics according to the target water content;
The temperature information comprises an infrared thermal imaging image, and the performing one-time abnormality judgment on the target cultural relics according to the temperature information comprises the following steps:
Taking the infrared thermal imaging image as input of a pre-trained neural network model to obtain a first water content of the target area;
If the first water content exceeds a first preset range, judging that the target cultural relics are abnormal, otherwise, judging that the target cultural relics are normal;
The obtaining the material and thickness of the surface coating of the target area comprises the following steps:
Inquiring maintenance records, and extracting the material type of the surface coating of the target area;
determining parameters of the target ultrasonic wave according to the material type of the surface coating of the target area, wherein the parameters comprise the frequency, the power and the pulse width of the target ultrasonic wave;
Transmitting a target ultrasonic wave to the target area according to the parameters, and receiving a echo signal;
determining the thickness of the surface coating of the target area according to the echo signal;
The transmitting the target microwave to the target area and receiving the microwave attenuation signal after the target microwave penetrates through the target area comprises the following steps:
inquiring a measurement record, and acquiring the latest water content measurement information of the target area as original water content information;
Determining the transmitting power of the target microwave according to the material and thickness of the surface coating of the target area and the original moisture content information;
transmitting the target microwaves to the target area according to the transmitting power;
the obtaining the target water content according to the microwave attenuation signal and the material and thickness of the surface coating of the target area comprises the following steps:
Converting the microwave attenuation signal into an electric signal, and amplifying and filtering the electric signal to obtain a target signal;
calculating an energy attenuation value and a phase offset of the target microwave according to the target signal;
correcting the energy attenuation value and the phase offset according to the material and the thickness of the surface coating of the target area to obtain a target attenuation value and a target offset;
And obtaining the target water content according to the target attenuation value and the target offset.
2. A system for detecting the moisture content of a wooden relic based on an immovable relic, for implementing the method for detecting the moisture content of a wooden relic based on an immovable relic according to claim 1, wherein the system comprises:
the temperature information acquisition module is used for monitoring a target area of a target cultural relic in real time and acquiring temperature information of the target area;
The primary judging module is used for carrying out primary abnormality judgment on the target cultural relics according to the temperature information, wherein the primary abnormality judgment result comprises normal and abnormal;
The coating information acquisition module is used for acquiring the material and thickness of the surface coating of the target area if the primary abnormality judgment result is abnormal;
the microwave transmitting module is used for transmitting target microwaves to the target area and receiving microwave attenuation signals of the target microwaves after penetrating through the target area;
The water content detection module is used for obtaining target water content according to the microwave attenuation signal and the material and thickness of the surface coating of the target area;
And the secondary judgment module is used for carrying out secondary abnormality judgment on the target cultural relics according to the target water content.
3. The system for detecting the moisture content of the wooden relics based on the immovable relics according to claim 2, wherein the temperature information comprises an infrared thermal imaging image, and the primary judging module comprises:
the fuzzy water content calculation module is used for taking the infrared thermal imaging image as input of a pre-trained neural network model to obtain a first water content of the target area;
And the primary abnormality judgment module is used for judging that the target cultural relics are abnormal if the first water content exceeds a first preset range, and judging that the target cultural relics are normal if the first water content exceeds the first preset range.
4. The system for detecting the moisture content of a wooden relic based on an immovable relic according to claim 2, wherein the coating information obtaining module comprises:
the coating material acquisition module is used for inquiring maintenance records and extracting the material type of the surface coating of the target area;
The sound wave parameter determining module is used for determining parameters of the target ultrasonic wave according to the material type of the surface coating of the target area, wherein the parameters comprise the frequency, the power and the pulse width of the target ultrasonic wave;
The sound wave signal generation module is used for transmitting target ultrasonic waves to the target area according to the parameters and receiving echo signals;
And the coating thickness determining module is used for determining the thickness of the surface coating of the target area according to the echo signals.
5. The system for detecting the moisture content of a wooden relic based on an immovable relic according to claim 2, wherein the microwave emitting module comprises:
the water content prediction module is used for inquiring the measurement record and acquiring the latest water content measurement information of the target area as original water content information;
The microwave parameter determining module is used for determining the transmitting power of the target microwaves according to the material and thickness of the surface coating of the target area and the original water content information;
and the microwave generation module is used for transmitting the target microwaves to the target area according to the transmitting power.
6. The system for detecting the moisture content of a wooden relic based on an immovable relic according to claim 5, wherein the moisture content detection module comprises:
the signal preprocessing module is used for converting the microwave attenuation signal into an electric signal, and amplifying and filtering the electric signal to obtain a target signal;
The change amount calculation module is used for calculating the energy attenuation value and the phase offset of the target microwave according to the target signal;
the variation correction module is used for correcting the energy attenuation value and the phase offset according to the material and the thickness of the surface coating of the target area to obtain a target attenuation value and a target offset;
And the target water content determining module is used for obtaining the target water content according to the target attenuation value and the target offset.
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| CN112798622A (en) * | 2021-01-04 | 2021-05-14 | 电子科技大学 | A wood moisture content detection device and method based on microwave transmission principle |
| CN115326839A (en) * | 2021-05-10 | 2022-11-11 | 上海大学 | Nondestructive testing and analyzing method for water source of stone cultural relics |
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