186 results about "Microwave reflection" patented technology

An automatic, electromechanical microwave tuner, used for load pull transistor testing, employs three horizontally and vertically adjustable RF probes; the tuner creates very low mechanical vibrations, because it is capable of generating all microwave reflection factors required for complete load pull and noise measurement operations, using only vertical probe movement; it also provides high tuning dynamic range, large frequency bandwidth and continuous choice of tuning target areas.

The invention specifically relates to a reduced graphene oxide and nano cerium oxide composite microwave absorbing material and a preparation method thereof. The method comprises the following steps: preparing graphene oxide by using an improved Hummers method; mixing a graphene oxide aqueous solution with cerium nitrate in a mass ratio of 1:25, and adjusting the pH value to 10; and by using a one-step hydrothermal method, simultaneously generating nano cerium oxide and reducing the graphene oxide, so that a reduced graphene oxide and nano cerium oxide composite microwave absorbing material is obtained. The microwave absorption parameters of the composite material are tested by using a vector network analyzer, and the microwave reflection loss of the composite material is calculated by using a classical coaxial line theory. Results show that the reduced graphene oxide and nano cerium oxide composite microwave absorbing material has excellent microwave absorbing properties, high absorption strength and wide absorption band, and compared with nano cerium oxide, the microwave absorbing properties are greatly improved. Thus, the reduced graphene oxide and nano cerium oxide composite microwave absorbing material disclosed by the invention has broad application prospects, and is of great significance to the expansion of industrial application of rare earth oxides and the national defense construction.

The invention relates to a normal pressure microwave plasma generating apparatus, which consists of a rectangular waveguide, a wave-transparent gas seal membrane, a waveguide changeover mechanism, a microwave resonant cavity, a closure end adjustable phase matching unit, a reactor, a flame lighter, an outer layer cooling collar and a rotating air current generating unit. The microwave transmits in the rectangular waveguide, the reactor is disposed on the geometrical center in the resonant cavity which has the air cooling collar installed outside, the flame light is disposed upon a gas reaction tube and the rotating air current generating unit, the combined type insulated high temperature resistant electrode of the flame lighter is disposed along the inner axis of the quartz tube with the end position adjustable up and down freely. The invention achieves the following advantages: adopting the rectangular waveguide and waveguide conversion can make the microwave energy gathered to process higher power; the power capacity can reach 2KW; the close end can adjust the phase matching unit to generate standing wave in the resonant cavity, ensures the microwave energy coupled to the resonant cavity, reduces microwave reflection loss and improves energy utilization efficiency.

An apparatus, system, and method, for using circular mode magnetic microwave energy to heat the product in a continuous microwave process. The microwaves are generated and transmitted as rectangular waveguide mode microwave energy, and are converted by mode converters to circular magnetic mode microwave energy. As circular magnetic mode microwave energy, the microwave energy passes through a material and is reflected on the other side back into the material, thus traveling through the material a second time. Reflected microwave energy from the main reflected wave as well as reflections from other structures, surfaces and layers in the system travel back toward the microwave source. They are sensed, and a computer tuning system causes capacitive probes to generate offsetting microwave reflections, which are opposite in phase and equal in magnitude to the sum of all of the reflected waves. These induced reflections cancel and negate the reflected microwaves, resulting in optimum utilization of microwave energy to heat the product.

The invention relates to a high power microwave plasma diamond film deposition device, which belongs to the technical field of chemical gas-phase deposition of the diamond film, and comprises an upper cylindrical body of a microwave cavity, a lower cylindrical body of the microwave cavity, a diamond film deposition platform, a microwave reflection body, a quartz window, a plasma, an adjusting mechanism A and an adjusting mechanism B. The diamond film deposition platform and the microwave reflection body are arranged inside the upper and the lower cylindrical bodies, and the quartz window is arranged below the diamond film deposition platform; and the height of the microwave reflection body is adjusted through the adjusting mechanism A, the height of the upper cylindrical body is adjusted by the adjusting mechanism B, and the microwave reflection body reflects and strengthens the microwave electric field. The upper cylindrical body, the lower cylindrical body, the diamond film deposition platform, the microwave reflection body, the adjusting mechanism A and the adjusting mechanism B can realize the direct water cooling. Under the high power, the diamond film of high quality is deposited at a high speed, and the device has the advantages of reliability, convenient adjustment and the like.

The invention belongs to the technical field of high-temperature industry related measurement facilities and particularly relates to a self-cleaning microwave antenna with resistance to high temperature and corrosion. The self-cleaning microwave antenna comprises an outer sleeve used for installation, an antenna inner cover, a flange plate, a cooling fin, a PTFE (Polytetrafluoroethylene) antenna rod, a water-cooling cover, an air-cooling cavity, a wave-transmitting material plate, and the like. The invention has the beneficial effects that both a horn and a microwave reflection plane of the integral antenna are made from high-temperature-resistant self-cleaning ceramic materials so that the integral self-cleaning microwave antenna has strong temperature tolerance; the antenna is of a single-layer, double-layer or multilayer nested type cooling structure, a water-air mutual-separation and co-cooling closed structure is adopted according to the requirement of total cooling quantity, the air-cooling cavity plays a blowing role at the same time of playing a cooling role so as to form a rotation air flow to remove deposited dust on the inner surface of a radar and guarantee the cleanness of the surface of the wave-transmitting material plate, and an adherence resistant function is also fulfilled; and on the premise of meeting the requirement on the total cooling quantity and taking the balance between nitrogen-cooling expense and water-cooling expense into consideration, a thermal balance is achieved for the cooling quantity between water cooling and air cooling, and the advantages of large volume and fast temperature drop are achieved by applying water cooling to save nitrogen.

The invention discloses a drilling tool and a method for detecting the reservoir stratum boundary and thickness while drilling. In the horizontal drilling wells of coal stratums, hydrocarbon reservoir and other reservoir stratums, an ultrahigh-frequency electromagnetic wave and microwave reflection stratum detection ranging method is applied to identify the coal stratums, hydrocarbon reservoir and other reservoir stratums and the boundaries of upper and lower overlaying stratums thereof and measure the distances between a horizontal drill and the boundaries of upper and lower overlaying stratums. When the ground trenchless construction horizontal drilling operation is carried out on the basis of the method, obstacles above and below a track of a horizontal shaft can be detected, and the distances between the horizontal shaft and the obstacles can be measured; and when the horizontal drilling operation which passes through rivers or buildings is carried out on the basis of the method, a distance between a river bed or a building foundation and the shaft below the river bed or the building foundation is detected, and the drill is kept parallel to the river bed or the building foundation or within a preset distance in a drilling process.

The invention discloses a microwave ablation therapeutic apparatus with a microwave ablation needle protected based on microwave power detection. The microwave ablation therapeutic apparatus comprises the microwave ablation needle 1, a microwave ablation instrument 6, a coupler 2, a forward detection wave processing module 3, a reverse detection wave processing module 4 and a signal processing module 5. The microwave power output by the microwave ablation instrument 6 is transmitted to the microwave ablation needle 1 through a main feeder 23, the microwave power output by the microwave ablation instrument 6 outputs power through a coupling part of a forward coupler 21, wave detection is achieved through the forward detection wave processing module 3, and then a microwave output power value is obtained; part of the reflection power of the microwave ablation needle 1 is reflected through a coupling part of a reverse coupler 22, detection wave treatment is conducted through the reverse detection wave processing module 4, and then a microwave reflection power value is obtained; the signal processing module 5 calculates the energy injected into ablated tissue according to the monitored microwave output power value and the microwave reflection power value, and the output power of the microwave ablation instrument 6 is adjusted or cut off.

Embodiments of the invention are directed to a method of determining underground liquid (e.g., water) content. Embodiments of the method may include: receiving a scan of an area at a first polarization, the scan scans including first L band microwave reflections from the area. Embodiments of the invention may include receiving an optical data at a wavelength of 1 millimeter to 10 nanometers. Embodiments of the method may further include filtering electromagnetic noise from the scan using the optical data. Embodiments of the method may further include creating a water roughness map based on typical roughness values of various types of water sources and the filtered scan, identifying a first type of water sources using the water roughness map and the filtered scan and calculating the water content at locations in the area based on the identified first type of water sources.

The invention discloses a blood glucose detection method and device. The blood glucose detection device containing an antenna array is used for conducting blood glucose detection. The antenna array comprises a plurality of transmitting antenna array units and a plurality of receiving antenna array units. The method includes the steps that multiple paths of microwave detection signals of different frequencies are sent to conduct blood glucose detection; multiple paths of microwave reflection signals corresponding to the multiple paths of microwave detection signals are received; the multiple paths of microwave detection signals and the multiple paths of microwave reflection signals are analyzed, and a reflection spectrum of the multiple paths of microwave detection signals of different frequencies is obtained; the reflection spectrum of the multiple paths of microwave detection signals of different frequencies is analyzed, and the blood glucose concentration is determined. By means of the blood glucose detection method and device, the influence, on the microwave impedance magnitude, of the microwave frequency in the blood glucose detection process can be avoided, and thus the accuracy of microwave blood glucose detection is guaranteed; the reflection spectrum of the multiple paths of microwave detection signals of different frequencies is analyzed, and microwave blood glucose detection is achieved.

The invention discloses a pipe surface corrosion defect detection method and device based on microwave nondestructive test. The method comprises that a microwave signal reflected by the surface of a detected pipe is collected, imaging is carried out on a phase value of a reflection coefficient via a microwave imaging technology, edge detection is carried out on an imaging result to obtain defect position and width information, a defect detection model is constructed, and defect depth information is calculated. Phase values of the microwave reflection coefficients in different detection positions serve as imaging pixel points, the boundary is identified, the defect position and width information can be obtained, quantitative information of the defect depth can be resolved according to a reflection coefficient phase difference and defect size relation model, and thus, the position, width and depth of the defect in the pipe are detected quantitatively.

The invention discloses a multifunctional pavement overlay structure beneficial to microwave heating. The multifunctional pavement overlay structure comprises a microwave impedance matching layer (1), an asphalt concrete overlay layer (2), a microwave reflection layer (3) and an old cement pavement surface layer (4) from top to bottom in order. Specifically, the microwave impedance matching layer (1) and the asphalt concrete overlay layer (2) form an electromagnetic parameter gradual change structure; the asphalt concrete overlay layer is the main object of microwave heating, and steel slag and carbonyl iron powder are added to change the electromagnetic parameters of an asphalt mixture, so that the microwave impedance matching layer and the overlay layer form the electromagnetic parameter gradual change structure to significantly reduce microwave reflection on the pavement surface in the microwave heating process and enhance microwave loss of the overlay layer, thus enhancing the microwave heating efficiency of the overlay layer overall; the microwave reflection layer is formed by bonding compounding of nonwoven geotextile and aluminized glass fiber fabric, can reflect most of microwave transmitted by the overlay layer back to the overlay layer for re-absorption, thereby significantly improving the microwave utilization and heating efficiency. The overlay structure has the characteristics of high surface microwave transmissivity, strong microwave absorption of the middle overlay layer, and reflection recycling of bottom microwave.

The present invention provides a lightweight structure for simultaneously providing a reduced infrared and radar Signature, while adding little or no weight to a vehicle. As such, the present invention allows for substantial improvements over prior systems. An example of the type of vehicle able to make use of the present invention is a military helicopter, but there is nothing within the spirit and scope of the present invention limiting it to any particular vehicle. The teachings of the present invention are useful with any vehicle for which a reduction in infrared emissions and microwave reflections is desired.

The invention discloses a blood glucose testing method and device; the method comprises the steps: sending multi-path microwave detection signals with different frequencies; receiving multi-path microwave reflection signals and/or microwave absorption signals of different frequency scopes corresponding to the multi-path microwave detection signals with different frequencies; calculating the multi-path microwave reflection signals and/or microwave absorption signals of different frequency scopes by means of a predetermined algorithm, thereby, obtaining blood glucose concentration information. By adopting the multi-frequency microwave detection and according to the detected results, the blood glucose concentration is calculated, so that the microwave detection error of blood glucose can be reduced and the accuracy and stability of microwave detection for blood glucose can be improved.

The invention relates to a microwave plasma chemical vapor deposition (MPCVD) synthesis device, a control method and a synthesis method. The synthesis device comprises a microwave generating device, areaction cavity and a gas supply device. The synthesis device is characterized in that the synthesis device further comprises a microwave reflecting measuring device, a temperature measuring device,a vacuum measuring device, an atmospheric pressure control device and a control center, wherein the microwave generating device, the microwave reflecting measuring device, the temperature measuring device, the vacuum measuring device, the atmospheric pressure control device and the gas supply device are separately connected with the control center in a communication mode. According to the microwave plasma chemical vapor deposition (MPCVD) synthesis device, the control method and the synthesis method, by automatic matching of power, atmospheric pressure, temperature and reflecting microwave, dynamic balance is realized, the internal environment of the reaction cavity can be stabilized in the environment which is most suitable for the synthesis of a target product, and the synthesis rate andquality of the target product can be improved; through the automatic matching of the power, atmospheric pressure, temperature, and reflecting microwave, the operating efficiency of the operator is effectively improved, and the time and labor is achieved; and the use efficiency of a magnetron is effectively improved, and the use safety is ensured.

The invention provides an L-waveband low-guide magnetic field compact high-power microwave device; according to the scheme, the microwave device comprises a circular waveguide outer cylinder, a coaxial inner conductor and a cathode; the circular waveguide outer cylinder is arranged outside the coaxial inner conductor in a sleeved mode, and the cathode is arranged at the front end of the coaxial inner conductor to transmit an annular electron beam; a microwave reflection cavity, a beam-wave interaction cavity, a first microwave extraction cavity and a second microwave extraction cavity are sequentially arranged in the circular waveguide outer cylinder along the electron beam transmission direction; and the annular electron beam emitted by the cathode can be radiated to generate high-power microwaves with the frequency of 1.56 GHz after passing through the four-resonant cavity structure in the primary pulse. According to the device, the size and the weight of a high-power microwave source system are greatly reduced, and the energy requirement of the magnetic field on the power supply can be greatly reduced.

A system and a method may detect underground water or gas leakage. The method may include receiving a first scan of an area including an underground gas pipe at a first polarization, the first scan including first microwave reflections of the area at a wavelength range of 3.8 cm to 1.3 m; receiving additional data, filtering electromagnetic noise from the first scan using the additional data; creating a water roughness map based on typical roughness values of a set of types of water sources and the filtered first scan; identifying one or more water accumulations at one or more locations along the gas pipe using the water roughness map and the filtered first scan and calculating the water content at the one or more locations along the gas pipe based on the identified one or more water accumulations.

The invention discloses a microwave calorimeter for measuring material microwave heat effect and its calorimetric method. The microwave calorimeter comprises a measurement control device and a microwave generating device, a reaction cavity body and an air pressure adjusting device which are connected to the measurement control device; the joint of the reaction cavity and the other parts is furtherprovided with a sealing device, and an isolating device is connected to the middle of the microwave generating device and the reaction cavity; a guide wave device for placing the microwave reflectionis arranged in the isolating device, the microwave generated by the microwave generating device enters the reaction cavity body through the isolating device; the reaction cavity body is connected with an air pressure adjusting device. After absorbing the microwave energy by means of internal loss medium, temperature is risen up to make the change of pressure intensity in the cavity, and the measurement of the medium temperature is further realized. Through pressure change, the microwave calorimetric effect under different working condition parameters is measured; the wave absorbing ability ofthe material is presented; the microwave calorimeter has the advantages of big range, high sensitivity, and others.

The invention relates to a method for carrying out breast tumor imaging by utilizing a microwave reflection time domain S21 signal. The method comprises the following steps: preparing a cavity breast model and a suspended tumor prosthesis; manufacturing a breast model with a tumor; connecting a transmitting antenna and a feeder line with a port 1 of a vector network analyzer; connecting a receiving antenna and a feeder line with a port 2 of the vector network analyzer; stimulating a measurement mode of a network analyzer time domain S21 signal; clinging the transmitting antenna and the receiving antenna and placing oppositely in a first-time measurement process; recording a transmission path time domain S21 signal at the moment; separating the transmitting antenna and the receiving antenna for a certain distance in a second-time measurement process; recording a new transmission path time domain S21 signal; subtracting the time domain S21 signal in the presence of the tumor prosthesis by the time domain S21 signal in the absence of the tumor prosthesis, so as to obtain time domain S21 signal changes caused by the tumor prosthesis; carrying out the tumor imaging on the subtracted time domain S21 signal by utilizing a confocal method.