70 results about "Microwave resonance" patented technology

The invention provides an active regulation and control device for a microwave resonant cavity based on Rydberg atoms. The microwave resonant cavity comprises a protective shell, an atomic gas chamber and a photoelectric detector, the active regulation and control device comprises a PID control module and piezoelectric ceramics, the PID control module is used for processing a received EIT transmission spectrum signal after generating a modulation signal to carry out atomic resonant frequency scanning on the atomic gas chamber, obtaining a target resonant frequency through a current feedback zero crossing point corresponding to an EIT transmission spectrum valley bottom value, and generating a deviation correction signal; and the piezoelectric ceramic is used for adjusting the length of a protective shell of the microwave resonant cavity according to the received correction signal, so that the atomic resonant frequency is locked as the target resonant frequency. The invention further provides an active regulation and control method for the microwave resonant cavity based on the Rydberg atoms. According to the invention, the resonant frequency of the microwave resonant cavity can be rectified in real time, and the optimal and most stable resonant mode of the local oscillation microwave frequency responding to atoms is kept.

The invention relates to the technical field of assembly clamps, and discloses a flexible assembly clamping jaw device based on multi-dimensional force sensing, comprising: a central precision positioning unit comprising a central positioning seat, the tail end of which is provided with a central adsorption disc with a first pressure sensor and a first microwave resonance sensor; the miniature laser radar is arranged at the tail end of the central positioning seat and is used for calibrating spatial poses; according to the device, multi-sensor fusion sensing is adopted, complete closed-loop control is constructed, the central adsorption disc, the near-end telescopic adsorption disc and the far-end telescopic adsorption disc are all integrated with pressure sensors and microwave resonance sensors, contact force and gap changes are monitored respectively, all sensing data are fed back to the control unit in real time, and the control unit is controlled. And the action parameters of all execution mechanisms are dynamically adjusted, intelligent regulation and control of the whole process from contact to fitting to locking are achieved, and the environment adaptability and operation stability of the clamping jaw are improved.

The invention belongs to the technical field of road maintenance, and discloses a road concrete pavement layer self-adaptive crushing method based on microwave-assisted resonance, and the specific technical scheme is as follows: a microwave heating device is used for pretreating a cut and divided crushing area, and a concrete layer is weakened through a heating effect of microwave radiation to realize separation of a pavement layer; when it is judged that the temperature of the concrete in the heating area reaches the needed temperature through the thermal infrared imager, the inherent frequency of the concrete is calculated, a calculation result is fed back to the resonance crushing device, and the resonance crushing device enables the pavement layer to generate forced vibration to be crushed by generating excitation frequency; the novel method for crushing the concrete pavement layer based on microwave-resonance energy coupling has the characteristics of being accurate, controllable, efficient, applicable to multiple scenes and the like, and can be matched with an acoustic emission system to realize closed-loop control of concrete crushing, so that the working environment of the concrete pavement layer is greatly improved, and the service life of the concrete pavement layer is prolonged. And the maintenance frequency of the equipment is greatly reduced while the crushing efficiency is improved.

A method for non-invasively identifying a location of a mass or tumor including: providing a patient with a possible mass or tumor; providing a detector including one or more resonant sensors, each sensor including at least one loop resonator, at least one cavity resonator, or at least one waveguide resonator; detecting resonant frequencies at different locations on the patient's skin near locations of the mass or possible tumor; and locating the mass or tumor by noting a location of an atypical resonant frequency.

The invention relates to a VOCs purification device based on an enrichment catalysis coupling microwave integrated technology, the VOCs purification device comprises an air inlet, a flip slide bar device and an overall shell, the lower part of the flip slide bar device is connected with the overall shell, and the upper part of the flip slide bar device is connected with the air inlet; a supporting frame is arranged at the bottom end in the overall shell, a stepping motor is arranged in a square groove position in the bottom of the supporting frame, and a three-rotation gear disc oil seal mechanism is arranged in a circular groove position in the top of the supporting frame. A thrust bearing is further arranged in the overall shell, and a rotating wheel cavity is formed above the thrust bearing. The upper part of the runner cavity is connected with a clean gas pipeline; the lower part of the base is connected with a three-spin gear disc oil seal mechanism; a microwave resonance shell is fixedly connected to the side face of the overall shell, and a microwave emission box is arranged on the microwave resonance shell. And a paint mist filter is arranged above the clean gas pipeline in the overall shell. Compared with the prior art, the device has the advantages that industrial waste gas can be directly absorbed, and purification of VOCs is completed under automatic control.

The invention discloses a detection and monitoring system for fault early warning in use of an insulating sling, relates to the technical field of electrical safety and intelligent monitoring, and is used for solving the problem that an internal progressive deterioration trend cannot be captured. A microwave resonance signal in the sling is obtained, the resonant frequency offset of each layer is extracted based on spectral decomposition, and a humidity distribution result is inversed and fed back in combination with a dielectric property database, and is used for setting a monitoring period and collecting operation data; a key area is screened based on a humidity diffusion coefficient, an evaluation area of which the risk level needs to be improved is identified by using a weighted average method, and the risk weight is calculated and the early warning time is set through a nonlinear model in combination with the physical attribute and the diffusion coefficient of the area, so that the early identification and dynamic early warning of the hidden fault of the sling are realized, and the safety and the monitoring precision are effectively improved. And the sudden failure risk is reduced.

The household garbage sorting and resource utilization integrated system comprises a double-shaft crusher, a semi-magnetic roller is arranged in the center of the lower end of the double-shaft crusher, a slope conveying frame is arranged on the front side of the lower end of the semi-magnetic roller, and the front end of the slope conveying frame is connected with a low-temperature hot-pressing assembly; a microwave resonance drying assembly is arranged at the lower end of the low-temperature hot-pressing assembly, an eddy current sorting machine is arranged at the lower end of the microwave resonance drying assembly, and a high-temperature hot-pressing assembly is arranged on the lower side of the rear end of the eddy current sorting machine. And the utilization rate of resources is improved.

The invention relates to a current measurement method, electronic equipment and a readable storage medium. The method comprises the following steps: acquiring an initial resonant frequency of the quantum current sensor, and outputting a microwave modulation signal according to the initial resonant frequency; performing optical detection magnetic resonance measurement operation based on the microwave modulation signal, obtaining a measurement response signal for the microwave modulation signal, and demodulating the measurement response signal to obtain a demodulation component; when the demodulation component is not matched with the demodulation component target value, the PID parameter is adjusted, and the microwave frequency of the microwave modulation signal is adjusted based on the adjusted PID parameter until the demodulation component is matched with the demodulation component target value; a microwave frequency when the demodulation component matches the demodulation component target value is determined as a microwave resonance frequency, and a current measurement value is determined on the basis of the microwave resonance frequency. By adopting the method, the current measurement efficiency of the quantum current sensor can be improved.

The application discloses a soil microwave uniform disinfection operation system and an operation method thereof, and belongs to the technical field of soil disinfection. The soil microwave uniform disinfection operation system comprises a power chassis, an on-board control box, a rolling microwave irradiation system, a conveying mechanism and a shovel mechanism. The shovel mechanism and the conveying mechanism are sequentially arranged at the front end of the power chassis, and the on-board control box and the rolling microwave irradiation system are arranged on the upper end of the power chassis. The rolling microwave irradiation system comprises a microwave resonance cavity arranged on the upper end of the power chassis, microwave generating units arranged on the two sides of the microwave resonance cavity and a roller mechanism arranged in the microwave resonance cavity. The rolling microwave irradiation system is adopted to perform efficient disinfection on field soil, effectively reduces the risk of local overheating caused by microwave irradiation, effectively improves the microwave irradiation efficiency and uniformity of soil, and realizes the microwave irradiation disinfection treatment operation on the field soil piece by piece.

The invention discloses a double-resonance microwave sensor, and relates to the technical field of sensors, the double-resonance microwave sensor comprises a dielectric plate, the front surface of the dielectric plate is provided with a microwave resonance layer, and complementary opening resonance units are etched on the microwave resonance layer; the complementary opening resonance unit comprises an inner ring groove and an outer ring groove which are concentrically arranged, one side of the inner ring groove is provided with a connecting bridge extending outwards, and the connecting bridge is communicated with the outer ring groove; interdigital slotting units which are symmetrical to each other are arranged on the two sides of the outer ring groove respectively; the back surface of the dielectric plate is provided with microstrip lines corresponding to the complementary opening resonance units. According to the invention, by adopting a dual-resonance structure in which the complementary opening resonance units are coupled with the microstrip lines, dual-resonance transmission response can be excited and formed, so that the detection precision and sensitivity of the sensor are improved.

This aerosol generating device comprises: a source unit for generating microwaves; a resonance unit, comprising an accommodation space for accommodating an aerosol-generating article, for giving rise to microwave resonance due to the microwaves generated by the source unit; a cover disposed in the resonance unit so as to move between open and closed positions, opening and closing the accommodation space; and a control unit for controlling the source unit on the basis of external force exerted by the aerosol-generating article on the cover.

The application discloses an electron cyclotron resonance ion source, which comprises a plurality of microwave transmission modules, a plurality of microwave resonance cavities, a plasma generation chamber and a magnetic field module, the microwave transmission module comprises a microwave source, an impedance matcher and a waveguide, the microwave source is used for generating and emitting microwaves, the microwave sources generate microwaves with the same or different frequencies, the inlet of the waveguide is connected with the microwave source, and the outlet is connected with the microwave resonance cavity, each waveguide is connected with one microwave resonance cavity, the impedance matcher is used for adjusting the frequency and standing wave of the microwaves and realizing impedance matching of microwave feeding, the inlet of the plasma generation chamber is connected with the outlets of the plurality of microwave resonance cavities, free electrons are formed at the boundary of the plasma generation chamber and the plurality of microwave resonance cavities, and the magnetic field module is used for generating a magnetic field, so that the free electrons make spiral motion in the plasma generation chamber and collide with background gas introduced into the plasma generation chamber to generate plasma. The electron cyclotron resonance ion source can realize multi-frequency microwave feeding and improve the uniformity of plasma.

The application discloses a double-resonance microwave sensor and relates to the technical field of sensors, which comprises a dielectric plate, the front surface of the dielectric plate is provided with a microwave resonance layer, and the microwave resonance layer is etched with a complementary open resonant unit; the complementary open resonant unit comprises concentrically arranged inner ring grooves and outer ring grooves, one side of the inner ring grooves is provided with an outwardly extending connecting bridge, the connecting bridge is in communication with the outer ring grooves; the two sides of the outer ring grooves are respectively provided with interdigitated slotted units that are symmetrical to each other; and the back surface of the dielectric plate is provided with a microstrip line corresponding to the complementary open resonant unit. The double-resonance structure of the complementary open resonant unit and the microstrip line coupling can excite a double-resonance transmission response, so that the detection precision and sensitivity of the sensor are improved.

The invention relates to the technical field of selenium drum circulation, and particularly discloses a selenium drum recycling and replacing system and a control method.The method comprises the steps that firstly, quantitative characterization of subsurface defects and local mechanical properties is conducted on waste metal core base materials through microwave resonance and nanoindentation multi-source fusion detection, and a base material state quantitative data set is generated; performing multi-physical field transient simulation by taking the data set and target coating parameters as input, and predicting an interface residual stress score in a regeneration process; based on a prediction result, reversely solving a dynamic temperature control sequence and gradient material matching scheme; in a vacuum coating environment, active stress compensation coating is realized, transient thermal excitation modal testing is performed on the regenerated toner cartridge, high-frequency dynamic characteristics of the regenerated toner cartridge are extracted and compared with a simulation predicted value, simulation model parameters are optimized according to deviation data feedback, closed-loop control is formed, and the interface bonding strength and long-term imaging reliability of the regenerated toner cartridge are improved.

Disclosed is a method for characterising a sample (E), said method comprising magnetically coupling the sample to a microwave resonator (RHS) such that the coupling dominates the relaxation dynamics of an electron spin (SEL) of a paramagnetic centre of the sample, and determining, by nuclear-magnetic-resonance spectroscopy, coefficients Cij of coupling between a nuclear spin of the sample, called the probe nuclear spin (SNi), and other nuclear spins (SNj, SNk) of the sample, said method employing indirect detection of a state of said probe nuclear spin (SNi), through counting of microwave photons, of respective noise signals (SBS) produced by the return to equilibrium of said electron spin (SEL). An apparatus for implementing such a method is also disclosed.

The utility model discloses an industrialization microwave continuous type high temperature device, including: support chassis, be provided with the placement site on support chassis, be used for placing the sample board that has sample, the casing, form microwave resonance cavity in its inside, microwave source device is used for feeding microwave to microwave resonance cavity, reaction channel, can be penetrated wave, set up microwave resonance cavity inside, it includes: outer layer channel, and the inner layer channel of detachable setting in outer layer channel, telescopic power component, telescopic setting on support chassis, through telescopic push the sample board that places in placement site moves to drive the multiple sample board that is located at one side of placement site moves and in turn passes the inner layer channel. The utility model provides an industrialization microwave continuous type high temperature device, and it can realize the continuous high temperature heating of large quantities of samples, satisfies the demand of industrialization processing production.

The invention discloses a microwave resonance detection device and a microwave resonance detection method for synchronously measuring the moisture content and the bulk density of a material, and belongs to the technical field of microwave application. The microwave resonance detection device comprises a sample cavity, a resonant cavity, a discharging device, a temperature sensor, a signal processing module and a display unit; a microwave signal is generated through the signal processing module, is coupled to the resonant cavity through the sending probe and is received by the receiving probe after interacting with a sample, and the resonant frequency and power attenuation are detected by the reference detector and the signal detector in the signal processing module. The temperature of a sample is detected by the temperature sensor positioned in the sample groove, a signal is analyzed by the signal processing module, a function relation is established, and synchronous measurement of the moisture content and the bulk density of a measured material is realized. The measurement precision of the microwave moisture content and bulk density detection device is improved, the measurement result is not influenced by temperature, and rapid and high-precision detection of materials such as particles and powder is realized.

This heater assembly comprises: an oscillation unit that generates microwaves; a resonance unit that comprises an insertion space in which an aerosol-generating article is accommodated, and that heats the aerosol-generating article by resonance of the microwaves; and a microwave output unit that transmits the microwaves generated by the oscillation unit to the resonance unit, wherein the microwave output unit connected to the oscillation unit is screw-coupled to one region of the resonance unit, thereby coupling the oscillation unit to the resonance unit.

The application discloses a kind of based on AI dynamic proportioning's fungus mushroom residue fermentation ingredient control method and ingredient device, it is related to biological fermentation technical field.The application includes: S1: multi-modal data acquisition: by near infrared spectrometer, metal oxide semiconductor gas sensor array and microwave resonance moisture sensor, obtain cellulose / lignin spatial distribution, spoilage characteristic and humidity gradient;S2: parameter determination: according to target threshold value, the three-dimensional feature of original fungus mushroom residue pile and time sequence result, determine the optimal parameter;S3: adjustment control: according to the optimal solution, real-time adjustment is carried out to fermentation temperature, auxiliary material addition and aeration amount.The application combines spatial feature and time sequence data, realizes the digital twin modeling of fermentation process, simultaneously by the three-dimensional target space of composting degree-conversion rate-energy consumption constructed, in combination with K-means clustering algorithm and B spline curvature optimization, determine the optimal parameter, shorten the fermentation parameter adjustment response time.

The invention provides a spiral annular microwave resonance sensor and provides a water holding rate measuring method based on the spiral annular microwave resonance sensor, and the method comprises the following steps: respectively connecting a coaxial feeder line of the spiral annular microwave resonance sensor with an excitation port and a receiving port of a vector network analyzer; an observation window is formed in the inclined measuring pipe section, a high-speed camera used for obtaining the flow pattern of the flowing-through oil-water two-phase flow is arranged at the observation window, and a spiral annular microwave resonance sensor is installed at the downstream of the observation window; establishing a mixed dielectric constant model changing along with the water holdup under different flow patterns, wherein the mixed dielectric constant model is used for predicting the water holdup under the corresponding flow pattern according to the obtained mixed dielectric constant; solving a mixed dielectric constant based on the relationship between the resonant frequency and the mixed dielectric constant; and predicting the water holdup according to the mixed dielectric constant model which is identified by the high-speed camera and corresponds to the current flow pattern and changes along with the water holdup. The device and the method can realize the measurement of the water holdup of the oil-water two-phase flow under the complex flow pattern.

The invention discloses a multi-stage electrostatic dust collection and self-cleaning method for a printing down machine, which comprises the following steps of: dynamically pre-collecting dust, analyzing the characteristics of a material by terahertz spectrum, and generating turbulent flow by bionic fish scale-shaped flow deflectors; carrying out gradient electrostatic adsorption, and carrying out multi-stage electric field polarization, charging, particle adsorption, dust collection pole plate sensing monitoring, pulse blowback and polarity switching self-cleaning; activating plasma, generating radio frequency by a double-frequency generator to resonate with microwave, injecting mixed gas to activate, and monitoring spectrum in real time; intelligent vacuum suction, sensing and height adjustment of a silica gel suction nozzle, particle adhesion reduction through ultrasonic waves, temperature control through a micro-channel and vacuum degree adjustment through a variable frequency pump are achieved; and when the supercritical CO2 is used for cleaning and the efficiency is reduced, liquid CO2 is injected, supercritical fluid is formed through temperature rise and pressure rise, an auxiliary agent is added, stubborn pollutants are removed by virtue of a pulsed electric field, and CO2 is recycled. According to the invention, material self-adaptive processing, tracing and 5G remote operation and maintenance are realized through a terahertz spectrum analysis and control system, the quality control and fault response speed is improved, and the overall technical index reaches a leading level.

The invention relates to the field of functional ceramic manufacturing, in particular to a method for manufacturing a leaf cup based on microwave radiation carbonization treatment of leaves. According to the method for carbonizing the decorative wood leaves based on microwave radiation, on the basis of a traditional wood leaf drying treatment method, microwave treatment is innovatively used for treating the wood leaves till carbonization, and the treatment mode is optimized based on electromagnetic loss of polar molecules of different wood leaves. According to the method, by accurately controlling conditions such as microwave resonant cavity atmosphere and microwave frequency curve, pyrolysis of the decorative wood leaf cellulose is treated until the carbonization degree and hardness of a leaf body are moderate. According to the decorative wood leaves treated through the method, clear vein textures can be more easily fired in the firing process of the wood leaf cup, the aesthetic characteristic is achieved, the process cost can be saved, and the firing yield is increased.

This invention discloses a method and apparatus for online monitoring of moisture content in insulating oil of substation oil-filled equipment, relating to the field of power equipment condition monitoring technology. The method involves extracting insulating oil from the lower part of the oil-filled equipment, removing particulate impurities, and then diverting it via a four-way valve to three measurement units—microwave resonance, capacitive sensing, and infrared spectroscopy—to simultaneously detect moisture content. The detected insulating oil is then dehumidified and returned to the equipment. The control unit analyzes the three measurement results and automatically triggers a three-level treatment mode based on the moisture content, dynamically adjusting the output of the oil pump and dehydration unit. It also analyzes the source of moisture based on multi-dimensional parameters such as oil temperature, load, and ambient humidity. Simultaneously, the apparatus uses a mixed adsorbent of molecular sieve and activated alumina, along with a polyimide hollow fiber membrane, to reduce the moisture content of the insulating oil to below 5 ppm and 3 ppm, respectively. This invention achieves real-time online monitoring, intelligent diagnosis, and closed-loop automatic processing of insulating oil moisture, improving the equipment's insulation performance and operational reliability.

The present invention discloses a method, system, and device for early detection of metal pipeline corrosion, relating to the field of passive wireless sensing technology. The method comprises: receiving a to-be-processed microwave signal corresponding to each initial microwave signal; preprocessing each to-be-processed microwave signal to obtain a microwave signal feature set; the microwave signal feature set includes microwave resonance points, the correlation coefficient and Euclidean distance between each microwave resonance point and a healthy resonance point, and the mean, median, and variance of each microwave resonance point; inputting multiple microwave signal feature sets into a pipeline corrosion detection model to determine the pipeline status of the metal pipeline; the pipeline status includes water inflow and no water inflow; the pipeline corrosion detection model is determined by training a random forest model based on a sample set. The present invention achieves intelligent and automated prediction of metal pipeline corrosion.

The invention discloses a microwave irradiation area matching method and a microwave irradiation area matching system, and relates to the technical field of intelligent energy regulation and control. Key parameters such as reflection and transmission power, three-dimensional temperature distribution, blood flow change, tissue moisture content and thickness of a target area are acquired in real time by combining a multi-mode acquisition device, and a comprehensive physiological response parameter set is constructed through multi-source signal fusion and inversion processing; calculating a tissue resonance response coefficient, judging a microwave resonance absorption state, and implementing an energy regulation strategy; a thermal response coupling coefficient is calculated, thermal effect response is evaluated, and an adjustment strategy is given; calculating a microcirculation improvement index and implementing corresponding adjustment; and finally, constructing an AI dynamic energy adjustment model by using a convolutional neural network to realize adaptive optimization of energy output. According to the method, multi-parameter real-time closed-loop regulation and control can be realized, the energy transfer efficiency and the microcirculation improvement effect are improved, and the method has the advantages of high precision, safety and personalized adaptation.

The application discloses a microwave resonance cavity and a microwave plasma chemical vapor deposition device, wherein a convex top cover is arranged in a deposition chamber, and the convex top cover is arranged as a V-shaped convex platform or a W-shaped convex platform towards a deposition table, so that the microwave electromagnetic field in the resonance cavity can be improved, the electric field intensity at the top cover can be eliminated, plasma at the top cover can be avoided, the adverse effect of secondary plasma on diamond film growth can be eliminated, and the deposition of the diamond film is facilitated; and the resonance cavity with the conical deposition table can increase the electric field intensity and area on the tray, improve the microwave electromagnetic field in the resonance cavity, and then increase the plasma, improve the microwave energy utilization rate, and increase the deposition area and deposition speed of the diamond film.

The utility model discloses a microwave plasma reaction system, including: frame, microwave resonance cavity, assembles on the frame, microwave source device, assembles to the microwave resonance cavity outer wall, is used for to microwave resonance cavity inside microwave feed -in, quartz tube, from top to bottom through microwave resonance cavity setting, it has the reaction section in microwave resonance cavity, gas inlet component, with one end of quartz tube intercommunication, is used for the gas into, assembly spare, be located in the quartz tube, along the axial direction of quartz tube and extend to the reaction section, needle body, be located in the reaction section, perpendicular the axial arrangement of quartz tube, set up a plurality of, a plurality of needle body assembly spare is arranged along the axial direction of quartz tube and arranges, blanking component, with another end of quartz tube intercommunication, is used for discharging processing material, the microwave plasma reaction system that the utility model proposes, through microwave energy to gas ionization, can high -efficient production plasma, to material processing effect is good.

The invention belongs to the technical field of equipment for detecting water content of an oil product in a pipeline, and relates to a device and a method for detecting non-uniform distribution water content of an oil product based on a microwave resonance technology. The detection device comprises a microwave transmitting device, an MCU, an antenna, a pipeline, a detection device body and a microwave transmission line. The microwave transmitting device controls the D / A converter to input different voltage signals to the VCO through the MCU to generate microwave signals with different frequencies, and then the microwave signals are input into the antenna through the microwave transmission line. The whole antenna can be attached to a pipeline; a logarithmic detector of the detection device converts microwave signal power output by an antenna into a voltage signal, an MCU receives the voltage signal and transmits the voltage signal to a PC through a serial port, the PC can analyze and process data, and the water content of oil in a pipeline is obtained through characteristic frequency. The antenna of the device is small in size and easy to install, installation is simple and light, the water content of the oil product can be accurately detected, and the non-uniform water content in the pipeline can be measured in a real-time, online and non-contact mode.

The invention discloses a GFRP pipeline defect detection method and system based on microwave resonance. The GFRP pipeline defect detection method based on microwave resonance comprises a hole defect detection step 1 and a joint bubble defect detection step 2, wherein the hole defect detection step 1 is specifically implemented as follows: step 11, a microwave resonance probe moves relative to a GFRP pipeline at a first preset resonant frequency; a first preset distance is kept between the microwave resonance probe and the surface of the GFRP pipeline in the moving process; and 12, continuously recording the measured value amplitude of the resonance peak S21 of the microwave resonance probe in the moving process. The GFRP pipeline defect detection method and system based on microwave resonance have the beneficial effects that whether hole defects exist or not is judged, and if the hole defects exist, the hole diameter and the hole depth of the hole defects are further output; and judging whether a joint bubble defect exists or not, and further outputting the type of the joint bubble if the joint bubble defect exists.

Disclosed is a device for transdermally detecting the concentration of one or more substances in a subject's bloodstream. The device includes a signal generation module arranged to generate microwave frequency signals at one or more discrete frequencies. The device also includes a sensor module comprising at least one microwave resonance sensor arranged to make contact with a subject's skin, the at least one microwave resonance sensor arranged to transmit microwave frequency signals generated by the signal generation module into the subject's body. The device also includes a signal processing module connected to the at least one microwave resonance sensor and arranged to: detect a resonance characteristic of the at least one microwave resonance sensor, and process the resonance characteristic to determine the concentration of one or more substances in a subject's bloodstream.