200 results about "Electrostatic induction" patented technology

The invention discloses an electrostatic induction and optical imaging principle-fused online monitoring device and method for wear particles of a water-lubricated bearing, and belongs to the field of state monitoring of mechanical equipment. The device comprises a square insulation detection cavity, a detection electrode array, an electromagnetic shielding shell, a high-speed optical imaging module and a signal processing unit, the square insulation detection cavity is installed in a bearing lubrication water loop. The detection electrode array is fixed to the outer wall of the cavity and used for capturing electrostatic signals generated when the abrasion particles pass through. The electromagnetic shielding shell wraps the detection cavity and is grounded through a wire to eliminate environmental electromagnetic interference. The high-speed optical imaging module integrates a high-magnification microscope lens and a CMOS sensor, is coaxially mounted with the detection cavity, and obtains the morphology characteristics of the wear particles in real time; and the signal processing unit performs multi-modal data fusion analysis on the electrostatic signal and the optical image. Through cooperative detection of electrostatic induction and optical imaging, the monitoring precision and reliability of the wear particles of the water-lubricated bearing are remarkably improved.

The invention relates to the related technical field of dust detection, and provides a mining induced charge and light scattering fusion dust detection device and method.The dust detection device comprises a workbench, a sampling assembly and a detection assembly, and the sampling assembly comprises a sampling air pump, a conical airflow homogenizer and a closed sampling cavity; the detection assembly comprises an annular sliding rail, a light scattering detection module and an electrostatic induction detection module; the dust detection method comprises the following steps: S1, device initialization and zero calibration; s2, sampling preparation of dust-containing airflow; s3, dual-module synchronous signal acquisition; s4, data processing and temperature and humidity compensation; s5, carrying out anti-interference protection assembly; and S6, data fusion and result output. S7, device cleaning and standby; through cooperative work of the double detection modules, dust detection signals in different concentration intervals are accurately captured, wide-range coverage from low concentration to high concentration is achieved, and synchronous monitoring of dust concentration and particle size characteristics is achieved.

A soil sensor includes a signal generator, and a transmitter coupled to the signal generator, the transmitter configured to transmit a signal from the signal generator, the signal having a fixed frequency, the transmitter including a transmit electrode embedded within a first dielectric material. The soil sensor includes a receiver, the receiver being configured to electrostatically couple to the transmitter through a channel including soil, the receiver including a charge variation (QVAR) electrode embedded within a second dielectric material. The soil sensor includes a charge variation (QVAR) sensor coupled to the QVAR electrode, the QVAR sensor configured to detect a variation in charge detected at the QVAR electrode in response to the signal from the signal generator and output a digital signal including the charge detected. And the soil sensor further includes a processing circuit coupled to the QVAR sensor and configured to determine a level of moisture in the channel based on the digital signal.

The invention discloses a flexible self-powered sensor, sign language translation equipment and a sign language translation method. The flexible self-powered sensor comprises an upper power generation layer, a lower power generation layer, a supporting block and a wire. The flexible upper power generation layer and the flexible lower power generation layer are attached to the hand of a user as much as possible, the discomfort during wearing is reduced, and the wearing experience is improved; the first flexible friction layer and the second flexible friction layer are used for generating power through friction, so that dependence on external energy is reduced, and the equipment complexity is reduced; when the flexible self-energized sensor is extruded, the distance between the first flexible friction layer and the second flexible friction layer changes, charge distribution in the corresponding electrodes of the first flexible friction layer and the second flexible friction layer is changed based on the electrostatic induction principle, and quantitative analysis can be conducted on changes of hand actions of a user. In addition, the sensor has the characteristics of low cost and simple production process. The invention relates to the technical field of sign language translation.

A friction nanometer generator disclosed by the present invention comprises a collection unit, a conversion unit and an output unit, the collection unit comprises an input shaft and a base, the conversion unit comprises a roller and a fixed cylinder, the outer wall surface of the roller and the inner wall surface of the fixed cylinder are both provided with friction materials, and the polarities of the friction materials of the roller and the fixed cylinder are opposite; the output unit comprises an energy storage electrode layer and an output electrode layer. The input shaft drives the roller to rotate, the roller and the inner wall of the fixed cylinder rub and roll, and friction materials of the roller and the fixed cylinder have opposite polarities and rub to generate electric energy; the generated electric energy is injected into the energy storage electrode layer, the energy storage electrode layer transmits energy to the output electrode layer through electrostatic induction, and the output electrode layer generates current output. Friction resistance and material abrasion are reduced in a rolling contact mode, the energy storage electrode layer and the output electrode layer of the output unit are of a non-contact structure, a large number of charges are generated due to electrostatic induction, an efficient electric energy output system is formed, and the charge density and the output performance of the friction nanometer generator are effectively improved.

The invention provides a space particulate matter concentration detection method and device in an industrial and mining environment, relates to the technical field of industrial and mining environment detection, and solves the technical problem of low detection accuracy in the prior art. The method comprises the following steps: sensing a charge signal of the suspended particulate matter through a charge acquisition probe; the charge acquisition probe is used for generating induction current according to electrostatic induction charge characteristics of the suspended particulate matters; carrying out amplification processing and noise processing on the charge signal, and adopting a differential signal processing mechanism to eliminate environmental noise in the noise processing; the processed charge signals are input into a particulate matter characteristic model, and the spatial particulate matter concentration is obtained through calculation; the particulate matter characteristic model is used for representing an association relationship between electrostatic induction charge characteristics and concentrations of particulate matters with different particle sizes. The method is used in the detection process of the space particulate matter concentration.

The invention discloses a real-time monitoring device, system and method for the motion state of a triboelectric rotating component. The device comprises a rolling bearing, wherein the rolling bearing comprises a bearing ring, a retainer and a rolling body; the sensor comprises a dielectric ring and a stator circuit board, and the dielectric ring and the stator circuit board are arranged on the same side of the rolling bearing; the dielectric ring is arranged on the retainer and rotates at the same speed as the retainer; the stator circuit board is provided with a pair of electrodes, and the dielectric ring can generate electrostatic induction with the pair of electrodes so as to generate an electric signal used for monitoring the operation state of the retainer. According to the invention, the sensor and the rolling bearing can be integrated in a narrow space and the operation state of the retainer can be monitored.

The invention discloses a charged body flight path sensing method based on an electrostatic induction principle. The charged body flight path sensing method comprises the following steps: capturing an electrostatic field signal generated by a flying charged body through a hemispherical electrostatic induction electrode array; each detection electrode is composed of an induction plate, an insulation substrate and a shielding electrode, the space directivity of the induction plate is effectively improved, and lateral electrostatic field interference is reduced. And an amplification circuit in the rear-stage high-resistance antistatic sensor independently amplifies signals of each detection electrode, and digitally acquires the signals through a multi-channel oscilloscope. A multi-gene symbol regression method is combined with a genetic algorithm and a linear least square method, a mathematical expression is optimized to minimize a prediction and target output error, and a circumference absolute error between a prediction value and a target value is calculated. And finally, filtering and demigration processing are carried out on the collected signals, the time difference of signal peak moments is mined, a time characteristic value data set of the flight path is constructed, and accurate data support is provided for analysis of the flight path of the electrified body.

The application relates to a device and method for electrostatic induction and sound surface wave mask electrolytic machining, belonging to the electrolytic machining field. The pump, the liquid storage tank and the electrolytic tank are connected to realize electrolyte circulation. The various components in the electrolytic tank are riveted. The anode and cathode assemblies and the shielding induction electrode assembly are inserted into the electrolytic tank. The positive and negative poles of the power supply are connected with the anode and cathode plates in the anode and cathode assemblies respectively, and the workpiece arranged in the induction electrode assembly is arranged in the electric field between the anode and cathode plates. The piezoelectric ceramic is attached to the base plate of the induction electrode assembly, and the signal generator and the power amplifier are connected with the piezoelectric ceramic. Based on the device, the piezoelectric ceramic is connected with a megasonic driving voltage to generate a surface wave on the surface of the workpiece; the anode and cathode plates are connected with direct current, and the workpiece is arranged in the electric field formed by the anode and cathode plates, so that the surface to be machined of the workpiece is subjected to oxidation reaction, and the non-machining surface is subjected to reduction reaction, thereby realizing wireless induction machining of the workpiece. The application has the advantages of simple operation, re-distribution of the electric field, enhancement of mass transfer, improvement of mask electrolytic machining precision, arrangement of multiple workpieces in the electric field formed by the anode and cathode plates, and substantial improvement of mask electrolytic machining efficiency.

The present invention discloses a gesture recognition sensor based on a triboelectric nanogenerator and a preparation method thereof, which relates to the technical field of gesture recognition and solves the technical problem of poor wearing comfort of the gesture recognition sensor. The key points of the technical solution are that the sensor includes an Ecoflex layer, a metal electrode layer, and an insulating support layer. Based on the principle of electrostatic induction and friction, the contact and separation of the back-of-hand skin and the sensor can generate electrical signals of a certain mode. The sensor can obtain multiple groups of different electrical signals generated by the deformation of the skin at different positions on the back of the hand through an array arrangement on the back of the hand. The electrical signals can accurately identify specific gestures after being processed and analyzed by machine learning. The application of the array arrangement method not only reduces the size of a single sensor and improves the wearing comfort, but also can obtain more motion signals from different positions, greatly improving the accuracy of gesture recognition.

In one example, the static electric induction device includes:a heat-generating component which is subject to electric induction, anda duct system configured to lead a coolant along the heat-generating component, whereinthe duct system includes a plurality of cross channels and at least two longitudinal channels, each one of the longitudinal channels is assigned to at least some of the cross channels and the assigned cross channels connect the respective longitudinal channels with each other, andthe duct system further includes at least one flow obstruction located in at least one of the longitudinal channels, the flow obstruction is configured to allow flow of the coolant through it and locally narrows a cross-section of the respective longitudinal channel by at least 75%.

The invention discloses a method for collecting and constructing an electrostatic induction signal data set of a flying charged body. The electrostatic induction signal data set comprises an induction plate, an insulating substrate and a shielding electrode. The array is distributed on the hemispherical shell, the central axis points to the sphere center, and the inclination angle of the normal electrode is 0 degree. The experiment comprises a central spot emission mode and an area strafing mode, and four paths of electrostatic induction signals are recorded. A multi-channel digital oscilloscope with a sampling rate of 20KHz is used for synchronously recording signals, and filtering and deoffset processing are carried out. The flight path information is mined through the time difference of the signal peak moments, and a time characteristic value data set is obtained. The electrostatic field signal generated by the flying charged body can be effectively captured, and a data basis is provided for analysis and application.

The invention discloses an electrostatic induction electrode array system for simulating an electrical induction organ of a shark, which comprises an electrified target, an electrostatic field and a hemispherical electrostatic induction electrode array, and is characterized in that a detection electrode of the hemispherical electrostatic induction electrode array comprises a cylindrical structure consisting of an induction plate, an insulating substrate and a shielding electrode; the bottom end in the electrostatic sensor is a circular-plate-shaped induction plate used for inducing a space electrostatic field and connected to the signal input end of the electrostatic sensor, the insulating substrate is used for electrically separating the induction plate from the shielding electrode, and the shielding electrode is connected to the power ground of the electrostatic sensor and used for blocking the influence of a lateral electrostatic field on the induction plate. The detection electrode obtains a current value of the charged target, and the current value is used for representing a static signal generated when the charged target passes through the detection electrode. According to the invention, a high-spatial-resolution electrostatic field sensor is realized, the induction area and spatial resolution of an unmanned platform to a spatial electrostatic field can be improved, and the attack direction of a flying charged body can be accurately sensed.

The utility model discloses a parallel clamping plate-shaped vibration electrode for static detection, and belongs to the field of charge electric quantity measurement. Comprising a pair of parallel clamping plate electrodes arranged in a mirror image mode. Each parallel clamping plate electrode consists of an external electrode plate and an internal electrode plate; a piezoelectric ceramic piece is arranged between the external electrode piece and the internal electrode piece; the external electrode plate, the internal electrode plate and the piezoelectric ceramic plate are fixedly connected into a whole; the parallel clamping plate electrode is fixed on the circuit board through an external electrode plate; an electrostatic induction electrode is arranged at one end of the parallel clamping plate electrode; the electrostatic induction electrodes are independently fixed on the circuit board; the external electrode plate is electrically connected with the circuit board; and the internal electrode plate is connected with zero volt voltage. A point fixing mode of a vibration electrode is changed into a surface fixing mode; the function (main) vibration direction is parallel to the length direction of the vibration electrode, and the piezoelectric ceramic piece completely covers the vibration electrode piece; and interference vibration and stray capacitance signals caused by the interference vibration can be effectively reduced, so that the detection result is more accurate, and the stability is better.

A rotation angle vector sensor and a rotary password lock. The rotation angle vector sensor comprises: two turntable friction nanogenerators, respectively used to provide clockwise and counterclockwise angle sensing signals, both comprising a friction conductive component and a friction component; a transmission shaft, which is passed through the two turntable friction nanogenerators; a first rotating mechanism and a second rotating mechanism, which are installed on the transmission shaft, respectively used to drive the friction components of the corresponding turntable friction nanogenerators to rotate synchronously when rotating clockwise and counterclockwise. The present invention couples the principles of friction electrification and electrostatic induction, and combines an innovative rotating mechanism, which can be used for synchronous sensing of rotation angle and rotation direction and real-time feedback, and has the advantages of no need for power supply, compact structure and simple manufacturing. The rotary password lock utilizes the characteristics of the rotation angle vector sensor that can perform synchronous sensing of rotation angle and rotation direction, which enhances the complexity of the password and can prevent the password from being cracked by tracking the input trajectory, thereby improving security.

The invention discloses a rotor misalignment dynamic detection method, device and system, a medium and equipment. The method comprises the following steps: acquiring an electrostatic induction voltage signal of a rotor to be detected; preprocessing the collected electrostatic induction voltage signal of the rotor to be detected; constructing a rotor misalignment dynamic detection model; and detecting the pre-processed electrostatic induction voltage signal of the rotor to be detected based on the rotor misalignment dynamic detection model so as to obtain the misalignment amount of the rotor to be detected. Based on the electrostatic induction principle, the misalignment amount of the rotor can be effectively obtained without direct contact with the rotor.

The utility model discloses an electrostatic induction pendulum for earthquake monitoring and early warning based on electrostatic induction. The device comprises a pendulum and an electrostatic induction sensor, and tiny potential changes can be detected in the swinging process. As a core component, the electrostatic induction sensor consists of the following key parts: a weight module, a connecting layer I, an electrode layer, a connecting layer II and an electrostatic interaction layer. Wherein the weight module provides necessary mass so as to ensure the dynamic characteristics of the pendulum; the first connecting layer is used for fixing the connection between the weight module and the electrode layer; the electrode layer is responsible for detecting electrostatic induction signals generated by pendulum motion and converting the signals into measurable potential change; the second connecting layer is used for fixing the electrode layer and the electrostatic interaction layer; the material of the electrostatic interaction layer carries charges, and the electrostatic induction signal of the electrode layer is enhanced in the earthquake monitoring and early warning process. Through the design, the device can realize high-sensitivity monitoring of earthquake precursor, and can capture fine ground movement caused by earthquake waves. In combination with a data acquisition system and a machine learning algorithm, the device can analyze the signals in real time and automatically send early warning information to related departments and individuals when an abnormal vibration mode is detected, so that precious time is won for taking preventive measures.

The invention discloses a passive bipolar movable mask electrochemical machining device and method for a workpiece. The device comprises a power supply control system, an electrochemical machining system, a motion control system and an electrolyte circulating system, the electrochemical machining system is provided with a first electrochemical machining tank and a second electrochemical machining tank which are oppositely arranged, two electrodes are arranged in each electrochemical machining tank, and two movable masks are pressed and attached to the two faces of a workpiece to form a mask structure. The motion control system drives the two grooves to be closed or separated; the electrolyte circulating system forms flushing and sucking liquid circulation facing the surface of a workpiece through a flushing pipe and a liquid sucking pipe; the power supply control system intermittently switches the polarities of the two electrodes, so that charge distribution on the two sides of the workpiece is alternately changed, and passive bipolar electrochemical machining is realized; according to the method, photoresist is replaced by the movable mask, the process is simplified, the efficient liquid flushing and absorbing mode and the electrostatic induction machining mode are combined, the inter-electrode mass transfer and electric field uniformity are remarkably improved, and the machining efficiency, precision and depth-diameter ratio are improved.

The application is an array type electrostatic sensor, a projectile velocity measuring device and method based on the sensor. The array type electrostatic sensor is in the shape of a tube coaxially arranged behind the projectile outlet and the barrel or bore body, and a plurality of circumferentially arrayed graphite electrodes in a pleated triangle structure are arranged at the upstream and downstream cross sections along the axis of the tube. The measuring device comprises an induction unit, a signal conditioning unit and an analysis and calculation unit, obtains the electrostatic induction signal component belonging to the projectile, then according to the velocity range of different projectile models, selects the electrostatic induction signals of the electrodes at different positions in different cross sections to reconstruct the charge distribution and establish the cross correlation sensitivity matrix, and further based on the correlation focusing principle of the electrodes at different cross sections, proposes a data fusion algorithm of multiple sensor electrodes, and finally measures the muzzle projectile velocity. The application proposes to use electrostatic field sensing measurement as a new means for projectile testing in view of the complex environment of high temperature and high pressure at the muzzle.

The application belongs to the technical field of low-altitude aircraft detection, and particularly relates to a static electricity radar device for low-altitude aircraft detection and a working method thereof. The device comprises: a metal spherical shell configured to be grounded; an insulating material arranged on the surface of the metal spherical shell; a plurality of static electricity sensing electrodes embedded in the insulating material, the plurality of static electricity sensing electrodes being arrayed on the surface of the metal spherical shell, and the normal directions of the plurality of static electricity sensing electrodes converging at the geometric center of the metal spherical shell; and a signal processing module comprising a gating unit, a conditioning unit and a processing unit. The gating unit is connected to the static electricity sensing electrodes and is used for selecting specified static electricity sensing electrodes to be connected to subsequent circuits in time. The conditioning unit is configured to convert the induced charge signals into voltage signals and amplify and filter the voltage signals. The processing unit receives the digitized static electricity signals, and analyzes the spatial pose information of the low-altitude aircraft according to the signal intensity difference of different static electricity sensing electrodes. The spatial positioning of the low-altitude aircraft is realized by using the static electricity sensor array.

The utility model discloses an egg support type friction nanometer power generation pavement plate, the power generation principle of the plate is friction power generation and electrostatic induction coupling effect, current is generated through electron transfer generated by interaction between polar materials, and the purpose of pavement power generation is achieved. The plate at least comprises three structural layers, namely a compression-resistant protective layer, a friction nano power generation layer and a high-strength bearing layer from top to bottom, wherein the friction nano power generation layer is provided with a multi-layer egg support type insulating plate, a metal electrode layer, two friction surfaces which are attached to the friction nano power generation layer and have opposite polarities, an elastic support body and a rectifying circuit layer connected with the metal electrode layer. The utility model relates to a pavement plate with a function of collecting pavement vibration energy, which is arranged between a surface layer of a newly-built pavement and a structural layer or between structural layers of an existing pavement, and generates electric energy through a contact-separation friction process of a friction nanometer power generation layer under the action of vertical force and horizontal force generated by wheel load. And the application potential is wide.

An active noise reduction device and a range hood provided by the present invention include: a housing including a receiving cavity, with an opening provided on one side of the receiving cavity; a dust collecting member provided on the opening, including at least one electrode plate, the electrode plate being adapted to be connected to an external power supply and adsorb dirt particles on the periphery; and a noise reduction member provided in the receiving cavity, adapted to collect noise outside the housing along the opening, or emit sound waves for neutralizing noise to the outside of the housing. By providing an electrode plate on the opening and charging the electrode plate by connecting it to an external power supply, the charged electrode plate can, through the phenomenon of electrostatic induction, adsorb fine particles such as oil fume and dust on the periphery, preventing them from flying into the interior of the housing and adhering to the noise reduction member, keeping the surface of the noise reduction member clean and ensuring the noise reduction effect.

The invention relates to the technical field of hydrogen peroxide preparation through an anthraquinone method, in particular to a working solution regeneration treatment method and device in the process of hydrogen peroxide preparation through the anthraquinone method, and the method comprises the following steps: step 1, adsorbing and removing moisture in a working solution by adopting a solid alkaline material; step 2, applying an electric field to the working solution, so that water drops mixed in the working solution are charged; step 3, enabling the working solution to flow along a surface with sieve pores, applying another electric field on the surface, enabling the electrified water drops to move towards the surface under the action of the electric field, enabling the water drops to be polarized and subjected to electrostatic induction by the electric field, enabling two ends of the water drops to be charged with opposite charges to form induced dipoles, enabling positive and negative dipoles of adjacent water drops to attract each other, colliding with each other, and coalescing into large water drops, large water drops are discharged along the surface with the sieve holes; 4, the working solution is transferred to a carclazyte bed, a degradation product is reduced into anthraquinone, and then the working solution repeatedly enters a hydrogenation workshop section. The method has the following beneficial effects that the regeneration effect is good, the cost is low, and the service life of aluminum oxide is prolonged.

This invention provides a multilayer polarization-enhanced liquid-solid contact separation triboelectric nanogenerator structure, comprising, from bottom to top: a first electrode layer, a polarization-enhancing dielectric layer, a triboelectric layer, a second electrode layer, and a surface nanoparticle modification layer. Both the first and second electrode layers are made of copper foil and are used to collect charges generated by electrostatic induction. The polarization-enhancing dielectric layer is a PVDF thin film, used to enhance the interfacial charge storage capacity and electric field coupling strength, thereby enhancing the electrostatic induction effect and significantly improving the device's output voltage and current. The triboelectric layer is a FEP thin film, which can acquire electrons upon contact with the droplet. The surface nanoparticle modification layer is composed of PTFE nanoparticles, which adhere to the FEP thin film, further increasing the surface triboelectric charge density and thus improving the output voltage. This invention, through liquid-solid contact electrification and electrostatic induction mechanisms, can efficiently convert the mechanical energy of rainwater into electrical energy to provide power for low-power sensors in rainfall detection.

The application belongs to the technical field of instruments and meters, and particularly relates to a transistor proximity sensor based on an interdigital electrode extended gate structure. The proximity sensor is composed of a voltage source, an ammeter, a transistor, interdigital electrodes and the like. The voltage source is used for supplying power to the transistor drain and the far gate end of the interdigital electrodes, and the near gate end of the interdigital electrodes is electrically connected with the transistor gate via a conductive lead. The working mechanism of the proximity sensor of the application relies on the synergistic enhancement effect among the electrostatic induction between the target object and the interdigital electrodes, the regulation effect of the target object on the interdigital electrode capacitance and the modulation effect of the target object on the voltage division of the near gate end of the interdigital electrodes. When the charged target object or the uncharged target object approaches the extended gate end of the interdigital electrodes, the transistor source-drain current can be changed, so that the proximity sensing function is realized.

The application discloses a kind of round crystal processing with destatic device, belong to round crystal destatic technical field, including outer box and for being used to the processing mechanism of round crystal and carrying out destatic treatment, outer box is also provided with two for sending and sending out transfer mechanism and in-out mechanism of round crystal.The application is when round crystal enters the lower side of upper electrode plate, utilize high voltage power supply and electrify lower electrode sheet, form strong electric field, the electric field is excited by electrostatic induction on the back of round crystal and generates opposite polarity charge, generates uniform electrostatic adsorption force, firmly fixed on the surface of insulating sheet, realizes the lossless, clean fixing of round crystal;The application is set up air guide cabin and inner pole needle in the two sides of upper electrode plate, by applying several thousand volts high voltage generates strong electric field, ionize air and generate a large number of free electrons and positive ion, and form directional moving ion wind under the action of electric field, ion wind is directly blown to the surface of round crystal moving to the lower side of electrode plate, can rapidly, uniformly neutralize static charge on round crystal.

The present invention discloses a method and system for calculating the induced voltage of a low-voltage line in the same corridor as an ultra-high voltage line, including: obtaining the operating voltage and current data of the ultra-high voltage overhead line and the low-voltage line in the same corridor, the mutual capacitance and mutual inductance data per unit length between the three phases of the ultra-high voltage overhead line and the three phases of the low-voltage line in the same corridor, and the self-capacitance and self-inductance data of the three phases of the low-voltage line in the same corridor; respectively calculating the induced voltage, induced current, electrostatic induced voltage and current, and electromagnetic induced voltage and current data of the low-voltage line in the same corridor; if any of the above data exceeds the corresponding threshold requirements, the ultra-high voltage overhead line is redesigned until the above data all meet the corresponding threshold requirements. The present invention does not need to build a simulation model, nor does it need to simulate and compare all operating and shutdown conditions of all loops. The calculation process of line parameters is simple, with low workload and high efficiency.

The present invention discloses a liquid cosmetic ingredient analysis system based on the triboelectric effect. The system includes a microfluidic channel and a self-powered liquid sensor respectively used for manipulating trace liquid samples and analyzing trace element components. A driving component for driving the liquid to flow is connected to the microfluidic channel, and a voltage acquisition component is connected to the self-powered liquid sensor. The self-powered liquid sensor is a multi-layer thin film sensing structure prepared based on the triboelectric effect and the electrostatic induction effect. The multi-layer thin film sensing structure includes a glass substrate (1), a bottom electrode (2), a dielectric layer (3), and a top electrode (4) sequentially arranged from bottom to top. The microfluidic channel (5) is bonded to the upper surface of the top electrode (4). The present invention can determine the components in liquid cosmetics based on different voltage signals generated by the triboelectric effect, can miniaturize the cosmetic detection equipment, and the detection is more simple and fast.

The invention discloses an omni-directional flexible sliding energy conversion system and a full-printing preparation method, the system comprises a flexible substrate layer, an inner circle electrode containing a leading-out wire is uniformly deposited on the flexible substrate layer, an isolation layer is printed on the leading-out wire area of the inner circle electrode, and the isolation layer is printed on the leading-out wire area of the inner circle electrode. An outer ring electrode containing a leading-out wire is printed on the flexible substrate layer, wherein the outer ring electrode and the inner circle electrode are of an annular nested structure; coating and printing WPU / BaTiO3 composite ink on the flexible substrate layer and completely covering the inner circle electrode and the outer ring electrode to form a de-electron layer; and coating ink on the other flexible substrate layer to form an electronic layer. The electron-losing layer and the electron-gaining layer move relatively to cause an electrostatic induction phenomenon, the inner circle electrode and the outer ring electrode generate a potential difference, the potential difference causes movement of electrons to generate current, and displacement motion is converted into electric signals to be output. The system does not need to consume extra electric energy, can efficiently provide power support for wearable equipment, and has durability and reliability.

The invention provides a droplet generator, which belongs to the field of energy collection and comprises a fixed bracket, a bulk effect power generation structure and an electromagnetic induction power generation structure. The bulk effect power generation structure is rotationally connected with the two sides of the fixed support through a rotating shaft and comprises a plurality of blades arranged in a surrounding mode in the circumferential direction of the rotating shaft, and a shared electrode, two dielectric layers and a top electrode which are arranged on the outer side of each blade. The two magnets are opposite in magnetism; the electromagnetic induction electrodes are arranged on the two sides of the bulk effect power generation structure in the axial direction of the rotating shaft and form an electromagnetic induction power generation structure with the shared electrode; after the liquid drops drop to the dielectric layer, under the driving of gravitational potential energy, the liquid drops spread out and are in contact with the top electrode to form electrostatic induction, and electrons are driven to flow in a loop of the top electrode and the shared electrode to form current; meanwhile, after the liquid drops drop to the dielectric layer, potential energy of the liquid drops is converted into kinetic energy of the blades, and current is formed through change of magnetic flux of the shared electrode. The energy collection effect can be improved.