211 results about "Pyroelectricity" patented technology

The invention discloses a pyroelectric infrared human body detection device. The device comprises a pyroelectric infrared sensor, a Fresnel lens, an electronic circuit and a moving mechanism; the pyroelectricity infrared sensor is fixed on the moving mechanism which comprises drive equipment and a bracing frame driven by the drive equipment; and the pyroelectric infrared sensor is fixed on the bracing frame. A travel switch is arranged on the bracing frame; the electronic circuit comprises a control circuit of the travel switch; the control circuit of the travel switch receives a travel switch signal to control the operation of the drive equipment. The pyroelectric infrared human body detection device is provided with the moving structure to drive the pyroelectric infrared sensor to move in order that the static human body has movement relative to the pyroelectricity infrared sensor, thereby realizing the induction and the detection to the static human body.

The invention discloses an air conditioner control method, an air conditioner and a storage medium. When an initialization completing instruction fed back through a pyroelectricity infrared detection device is received, the pyroelectricity infrared detection device is controlled to detect a static heat source within the preset rotation angle, the relative position information of the static heat source is calculated by obtaining the deflection angle of the pyroelectricity infrared detection device relative to the preset initial position during pulse signal feedback within the period, and when the static heat source is a human body, the set temperature and / or the air outlet parameter of the air conditioner are / is adjusted according to the indoor and outdoor temperature and the relative position relation; and the problem that when the human body stays in one area still, a pyroelectricity infrared sensor cannot be utilized for generating pulse signals for adjustment on the running parameter of the air conditioner is solved, and the comfort of the air conditioner is improved.

The invention discloses solar united system of concentrate light and pyroelectricity. It has condenser plate and the pyroelectric united device set on condenser zone on the condenser plate. The pyroelectric united device is set with an outer insulating layer of glass, solar cell plate were set under the glass, with cooling conduit which links nano cooling fluid set under the cell plate, the cooling conduit of pyroelectric united device are connected with the cryogenic circulating conduit sequentially installed with cryogenic heat exchanger,cryogenic circulating pump and cryogenic governor valve; the cavity of pyroelectric united device is connected with the high-temperature circulating conduit sequentially installed with high-temperature heat exchanger,high-temperature circulating pump and high-temperature governor valve. The invention complex utilizes the photo electricity and photo-thermal; improve photovoltaic conversion efficiency when the heat is used. The condenser technology reduces the utilization area of photovoltaic battery panels; great reduce the system investment, with a very broad market prospect.

The invention discloses an intelligent monitoring and early warning system for safety helmet wearing on the transformer substation site. The intelligent monitoring and early warning system comprises a central processing unit, a camera monitoring device, a pyroelectricity infrared sensing module, a GSM module, a voice warning module and transformer substation entrance guard equipment. The whole intelligent monitoring and warning system for safety helmet wearing on the transformer substation site is installed on a transformer substation entrance guard. According to the system, the pyroelectricity infrared sensing module monitors whether operators enter or not, the camera monitoring device collects and analyzes images, whether the operators wear the safety helmets already is determined, if the operators wear the safety helmets correctly, the operators are allowed to enter, if the operators do not wear the safety helmets, the entrance guard is closed, the operators are not allowed to enter, the voice warning module is started to give a voice alarm, the GSM module is started to inform the operators on duty through an answering machine, the potential safety hazards are eliminated, the safety of the operators is protected, and the safety production management is improved.

A pyroelectric material of a quaternary skutterudite structure and a method for preparing the material, the chemical formula of the material is that CoSb3+delta-x-yXxYy, wherein the X is Se or Te, the Y is Ge or Sn, the delta is Sb compensation, and the x and the y are respectively the doping quantity of the X and the Y. The material is characterized by simultaneously doping IVB group and VIB group elements into CoSb3, and the material utilizes the charge compensation between the IVB group and the VIB group elements to increase the whole doping concentration, and introduces more point defect scatterings to reduce the heat conductivity. Under a proper condition, a CoX1.5Y1.5 phase can be separated from a Co-Sb-X-Y basal body and 'nanometer points' can be formed, and the additional scattering action can be generated to the phonon transport. The invention adopts the method of combining the mechanical alloying and the spark discharging plasma sintering, and prepares Co-Sb-X-Y quaternary materials with high pyroelectricity, and the non-dimensional value ZT of the material can reach 1.1 at 550 DEG C.

The invention relates to a graphene compounded with stibine cobalt base skutterudite thermoelectric material and a preparation method of the graphene compounded with stibine cobalt base skutterudite thermoelectric material. The chemical general expression of the material is MxCo 4 Sb 12 / graphene, wherein x is greater than or equal to 0 and less than or equal to 1, M is one of a rare earth element, alkali earth metal, alkali metal, Ga and Tl, and the content of the graphite olefine is less than 3%. The preparation method comprises the following steps of: (1) weighing M, cobalt and antimony, then mixing with a carbon nanometer pipe, and carrying out ball milling under inert gas shielding; and (2) placing the obtained substances in a graphite jig, and carrying out discharge plasma sintering under the inert gas shielding, thus obtaining the graphene compounded with stibine cobalt base skutterudite thermoelectric material. The graphene compounded with stibine cobalt base skutterudite thermoelectric material and the preparation method of the graphene compounded with stibine cobalt base skutterudite thermoelectric material have the advantages of simple preparation technology, short preparation time, easiness in control, good repeatability, low cost and good industrialization prospect; and the obtained material has a good pyroelectricity property.

A method of producing a lithium-tantalate crystal comprising, at least subjecting a single-polarized lithium-tantalate crystal wherein an optical absorption coefficient at a wave number of 3480 cm−1 is 0.3 cm−1 or less to a heat treatment under a reducing atmosphere at a temperature of not lower than 250° C. and not higher than Curie temperature and a single-polarized lithium-tantalate crystal wherein an optical absorption coefficient at a wave number of 3480 cm−1 is 0.3 cm−1 or less and an electric conductivity is 1×10−12 Ω−1·cm−1 or more. There can be provided a method of producing a single-polarized lithium-tantalate crystal in a short time efficiently wherein the surface charge generated due to a pyroelectric property can be decayed quickly by improving the electric conductivity and a single-polarized lithium-tantalate crystal.

The invention discloses a body automatic sensing LED light which is invented for solving the problems of high energy consumption, separation of incandescent bulbs and switches and the like in the prior art. The body automatic sensing LED light comprises a light holder, a shell and at least one LED luminous tube; a circuit board is arranged in the shell; an aluminum base plate is connected to the lower side of the circuit board; a circuit assembly is arranged on the circuit board; a pyroelectricity infrared sensor and a photodetector are arranged on the bottom surface of the aluminum base plate; the LED luminous tubes are all arranged on the bottom surface of the aluminum base plate; and a lens is arranged under the pyroelectricity infrared sensor. With the structure, the body automatic sensing LED light is switched in a commercial power 220V lamp holder, a circuit is rectified and filtered by an effective electronic transformer; a sensing signal is combined with the photodetector after being subjected to coupling signal processing, voltage amplification and shaping so as to realize the breakthrough of 90 percent of the commercial power conversion efficiency, large illumination, long service life and static micropower consumption. When the light is turned off when meeting the environment illumination in the day light, the light cannot turn on even if people moves in a light movement area; when no light is emitted at night, people can automatically trigger and turn on the light and the light is turned off in a delay way when people leaves, and the light works in cycles. The invention has the advantages of economical efficiency, practicability, environmental protection and energy conservation.

The invention belongs to the technical field of human body differentiation and provides a method for extracting and differentiating human body heat source features of infrared pyroelectricity wavelet packet energy. According to the method, the purposes of detection within a 360-degree large-scale range and with a long distance and detection of a static infrared heat source are achieved and the problems that the comfort and the energy-saving performance in an intelligent air conditioner conflict and the false alarm rate in a safety supervision system is high are effectively solved. Thus, according to the technical scheme, the method for extracting and differentiating the human body heat source features of infrared pyroelectricity wavelet packet energy comprises the following steps that a single pyroelectricity infrared detector is driven by a stepping motor to rotate at a constant speed, so that detection of a static object at the long distance and within 360-degree large-scale range is achieved; the detection range is within a disc, wavelet packet analysis is conducted on a collected sample of the human body heat source and a collected sample of a non-human-body heat source, wavelet packet energy serves as a feature of a signal, 5-folding-time cross validation is conducted through a BP neural network, and therefore the human body heat source and the non-human-body heat source are differentiated. The method for extracting and differentiating the human body heat source features of infrared pyroelectricity wavelet packet energy is mainly applied to occasions of the human body differentiation technology.

The invention discloses a device and a method for identifying gestures through compressed infrared sensing. According to the device for identifying the gestures, a pyroelectricity infrared sensor array visibly modulates a sub field-of-view in a Fresnel lens installed in front of a pyroelectric sensor by means of a random coding mode to randomly compress and project high-dimensional infrared radiation states generated by gesture motions into low-dimensional pyroelectricity infrared sensing array measurement space, so that characteristics of the gesture motions are obtained. According to the method for identifying the gestures, each semantic motion characteristic sequence with special actions is subjected to characteristic parameter estimation by means of vector quantization, a codebook is distributed to each characteristic sequence through training data and used as a semantic expression template, and test data are subjected to decision making by means of a classifier to express semanteme, so that the gesture actions are distinguished. By means of compressed infrared sensing, the gesture motion characteristics are obtained, generation and processing progresses of redundant and invalid information are effectively avoided, complexity and hardware costs of a sensing system are obviously reduced, and a light weight gesture identification algorithm is supported.

The invention discloses a high-precision infrared multi-gas detection device, and belongs to the field of gas detection. According to the high-precision infrared multi-gas detection device, with the combination of a variable cavity long light filter and an infrared light source which has a wide spectrum and has a stepper type working mode and a scanning working mode, gating wavelength which is emitted to a pyroelectricity sensitive unit to be detected can be controlled, and furthermore high-precision detection on multiple gases by using a single device can be achieved; through comparative analysis on output signals of a reference gas chamber and an absorption gas chamber, a relatively precise detection result can be obtained; meanwhile, due to the reference gas chamber, external factor interference can be reduced; in addition, a plurality of concave mirrors which can be reasonably adjusted through an optical distance component are arranged inside the absorption gas chamber, so that optical distance adjustment can be achieved, and measurement on concentration of different gases under high detection precision can be achieved. Due to a reasonable design structure, the types and the concentration of multiple gases can be detected with high precision at one time by using the single device, a novel gas detection device with good properties can be provided, and the application field of infrared gas detection can be widened.

The invention discloses a porous polyvinylidene fluoride-carbon nanotube composite material and a preparation method thereof. The method comprises the following steps: uniformly dispersing carbon nanotubes in a polyvinylidene fluoride base under the action of ultrasonic dispersion to form a conducting network structure, and forming pores in the film forming process of the polyvinylidene fluoride base by utilizing the volatilization of the poor solvent and the phase separation effect of the carbon nanotubes and polyvinylidene fluoride, thereby preparing the porous polyvinylidene fluoride base. By using the porous structure of the polyvinylidene fluoride base, the porous polyvinylidene fluoride-carbon nanotube composite material becomes a poor conductor of heat. The conducting network structure formed by the carbon nanotubes in the polyvinylidene fluoride base can effectively enhance the electric conductivity and Seebeck coefficient of the porous polyvinylidene fluoride-carbon nanotube composite material. The prepared porous polyvinylidene fluoride-carbon nanotube composite material has excellent pyroelectricity.

In the present invention, provided is an organic piezoelectric material specifically exhibiting high orientation and thermal stability as an organic piezoelectric material exhibiting an excellent piezoelectric characteristic and having piezoelectricity and pyroelectricity, which is capable of converting thermal or mechanical simulation into electrical energy, and also provided are an ultrasound probe for which the organic piezoelectric material is used, and an ultrasound image detector thereof. It is a feature that an organic piezoelectric material of the present invention possesses a compound represented by Formula (1) and a base material made of an organic polymeric material, satisfying Expression (1): |C Log P (1)−C Log P (base material)|≦3.0 when C Log P values of the compound and the base material are expressed as C Log P (1) and C Log P (base material), respectively.

The invention discloses a photovoltaic solar protection device with a fresh air ventilation function. The photovoltaic solar protection device with the fresh air ventilation function comprises a photovoltaic sun shield, a fresh air ventilation device and control switches, wherein the photovoltaic sun shield comprises a photovoltaic cell panel and a heat-insulated waterproof case; the fresh air ventilation device is provided with an upper air flue and a lower air flue, wherein a pyroelectricity module formed by a pyroelectricity chip and heat pipe radiators at the upper end face and the lower end face is arranged in the middle of a clapboard separating the upper air flue and the lower air flue, and the upper air flue and the lower air flue are internally provided with blowers; the photovoltaic cell panel is connected with the pyroelectricity chip and the control switches by leads, and the switch of working conditions of the winter and the summer is achieved through the switch of the control switches. According to the photovoltaic solar protection device disclosed by the invention, the photovoltaic in-situ power generation and utilization are achieved while the integration of a fresh air unit function and a sunshading function, the recycle of waste heat and cool air all year round is achieved, the advantages of photoelectric and photo-thermal comprehensive utilization, high system efficiency and compact device structure are provided, and the popularization and utilization values are favorable.

The invention discloses a current type terahertz pyroelectricity detector reading circuit, and belongs to the field of terahertz detecting and imaging. The reading circuit comprises a current-voltage converter, a 50Hz trap circuit, a first-order lowpass filtering amplifying circuit and an electric potential raising module. Signals output by the terahertz pyroelectricity detector are input into the current-voltage converter so that the current signals can be converted into voltage signals; the signals output by the current-voltage converter are input into the 50Hz trap circuit so that power frequency interference can be eliminated; the signals output by the 50Hz trap circuit are input into the first-order lowpass filtering amplifying circuit so that the signals can be further amplified; the signals output by the first-order lowpass filtering amplifying circuit are input into the electric potential raising module so that a voltage can be raised and the voltage signals output by the circuit can be matched with a voltage required by a rear digital collecting circuit. The voltage signals output by the circuit are pure, and the circuit is suitable for collecting and outputting a weak current of the terahertz pyroelectricity detector.

The invention provides an efficient nano negative ion releasing agent and a preparation method thereof and relates to the field of negative ion releasing materials. The negative ion releasing materials are widely applied to the fields of ceramics, coatings, plastics, spinning, decoration and the like, currently, most negative ion releasing materials are tourmaline and excite negative ion release by adding a large amount of rare earth or composite salt, radioactivity and heavy metal content of the most negative ion releasing materials exceed standard easily, the negative ion release is unstable, and the release efficiency is low. In order to overcome defects in the prior art, the efficient nano negative ion releasing agent is provided and is characterized by being prepared from raw materials in parts by mass as follows: 50-80 parts of the negative ion releasing material, 30-50 parts of an excitation material, 5-28 parts of an energy transfer material and 1-6 parts of a chelating agent. The efficient nano negative ion releasing agent and the preparation method have beneficial effects as follows: the efficient nano negative ion releasing agent is prepared through comprehensive adoption of a nano grinding technology and combination of piezoelectricity and pyroelectricity of the negative ion releasing material as well as chelating ligands of the excitation material and the energy transfer material with a chelating agent.

The invention is concerned with the electrode alloy pyroelectricity device of the cobalt antimonide pyroelectricity device and it's making method. It includes the Cu-W alloy electrode with the W quality percentage 20% to 30%; the rest components are copper and unavoidable impurity; the optimized Cu75W25 electrode hot coefficient of expansion (CTE) and the CoSb3 pyroelectricity are in right hot matching with difference no more than 9.8%. The component making applies the transition layer of the metal Ti, granularity about 20-50mum, and the discharge plasma sintering (SPS) method to achieve the connection of the Cu-W alloy electrode and the pyroelectricity. Because of the high conductivity and the thermal conductivity of the copper tungsten alloy and it is matching with the CoSb3 pyroelectricity material rightly, the invention is with the quite stable surface with no obvious composition plane electrode transition, keeps the making method simple.

The invention discloses a living energy-saving control device based on a video and an implementation method thereof. The living energy-saving control device comprises an image monitoring and controlling unit. The image monitoring and controlling unit is respectively connected with a photosensitive sensor, a passive pyroelectricity infrared detector, a camera, a temperature sensor, a buzzer, a first electronic switch, a second electronic switch, a first key and a second key. A people-counting program module based on the video, a human body behavior analysis program module based on the video, and a smoke and fire detection program module based on the video are embedded into the image monitoring and controlling unit. Through video-based control over an electric blanket, an electric fan and a night vision lamp in a bedroom, in winter, the electric blanket turned on can be cut off immediately or later when a user falls asleep; in summer, the electric fan turned on can operate with a normal blast volume before the user falls asleep, and the wind speed can be adjusted according to environment temperatures after the user falls asleep; the night vision lamp is turned on at night according to behaviors of the user, the night vision lamp and the camera are turned off when the user falls asleep and is in a static state, influences of infrared light of the night vision lamp and infrared light of the camera on health of the user who falls sleep are reduced, and the living energy-saving control device has a fire alarm function. The living energy-saving control device based on the video is more suitable for being used in a bedroom of a single person.

A method for producing a piezoelectric composite substrate with satisfactory productivity controls the inclination of the crystal axis and the polar axis of a single-crystal thin film and prevents an adverse effect due to pyroelectricity in a production process. The method for producing a piezoelectric composite substrate provided with a plurality of piezoelectric materials includes an ion-implantation step, a bonding step, and a separation step. In the ion-implantation step, H+ ions are implanted into a piezoelectric single crystal material. In the bonding step, the piezoelectric single crystal material is bonded to a piezoelectric single crystal material. At this time, the polarity of the polar surface of the piezoelectric single crystal material is opposite to the polarity of the polar surface of the piezoelectric single crystal material, the polar surfaces being bonded to each other. In the separation step, a separation layer of the piezoelectric single crystal material is divided by heating to separate a piezoelectric single-crystal thin film.

The invention relates to personnel counting method and equipment based on an embedded system. Information collected by adopting the traditional mode for collecting human body information is messy. The method comprises the following steps of: collecting signals: placing a detector of a signal collecting device at the top of a human body passing area, only responding human body signals limited in a detection area by an infrared pyroelectricity sensor through a reformed optical system, and converting the collected irregular signals into regular signals which can be identified by a processor; processing the signals: after the identifiable regular human body infrared signals are inputted to the core processor, indentifying the human body moving directions by adopting a fuzzy identification algorithm, and then counting personnel quantity in real time and automatically storing in an external memory; and establishing a system USB transmission interface by utilizing a USB controller of an embedded microprocessor so that users can transfer the data of personnel information in the memory through the USB interface. The invention is used for counting personnel in messy streams of people.

A SAW element of the present invention includes a plurality of inter-digital transducer (IDT) electrodes on a piezoelectric substrate, grating reflector electrodes disposed on the sides of the IDT electrodes, and a plurality of pad electrodes led from the IDT electrodes and the grating reflector electrodes. A plurality of the pad electrodes includes isolated pad electrodes not directly opposed to the outer periphery of the SAW element, and adjacent pad electrodes directly opposed to the outer periphery thereof A connecting electrode between the isolated pad electrode and the adjacent pad electrode is removed by etching at least before dicing in order to prevent discharge from occurring due to pyroelectricity, and to prevent the electrodes from being damaged.

The invention relates to an alarming system, in particular to a vehicle remote monitoring burglarproof system comprising a vehicle (1), a pyroelectricity detecting unit (2) in the vehicle (1), a processing unit (5), an image acquiring module (3) and a public communication unit (4). When the detecting unit (2) in the vehicle (1) detects a signal, the processing unit (5) controls the image acquiring module to acquire the image information in the vehicle and to transmit the compressed image through the public communication unit (4) to a display of a mobile telephone (6). The alarm system is free from distance influence and can know the situation in the vehicle at any time and place.

The invention relates to a static human body position estimation device and method based on the pyroelectricity technology. The device comprises a front end collecting module, a rotary transmission device and a data processing transmission module. The front end collecting module comprises a single-hole information modulation cover, a Fresnel lens and a pyroelectric sensor. The rotary transmission device comprises a stepping motor. The data processing transmission module comprises a data processing circuit, a wireless transmission circuit and a data storage circuit. The information modulation cover is used for adjusting the thermal infrared incidence amount of the human body. The Fresnel lens is provided with an induction region capable of enlarging the induction distance and generating bright and dark alternation. The stepping motor drives the front end collecting module to rotate on a fixing shaft at a certain speed and a certain angle, and the pyroelectric sensor is used for processing inducted human body thermal infrared energy signals through the data processing circuit. By the utilization of multiple pieces of measured angle information and in combination with a mature positioning algorithm, the position information of the static human body is estimated, and meanwhile the relative azimuth information of the static human body can be estimated through the single device.

The invention discloses a control system of a fire water monitor. The control system comprises a power module, an input module, a microcontroller and an output module, wherein the power module provides power for the whole control system; an output end of the input module is connected to an input end of the microcontroller; an input end of the output module is connected to an output end of the microcontroller and an output end of the output module is connected to an executive component of the fire water monitor; and the input module is provided with a pyroelectricity sensor the front end of which is provided with a narrow band filter through which only the infrared light with the wavelength of 4.06-4.4mu can be transmitted. After the technical scheme is adopted and the system adopts the microcontroller as a central controller, peripheral components are few and failure rate is low, and besides, as the front end of the pyroelectricity sensor is provided with the narrow band filter throughwhich only the infrared light with the wavelength of 4.06-4.4mu can be transmitted, sunlight, thunder and lightning light, electric welding light and other interference sources with the wavelength out of the range of 4.06-4.4mu are filtered out by the narrow band filter, thus ensuring the accuracy of detected flames and improving the working reliability of the system.

The invention discloses a microbial fuel cell electrode having a photocatalytic synergistic effect as well as a preparation method and an application of the electrode. The electrode comprises a carbon cloth supporting body, a tourmaline and reducing substance mixed powder layer and a modified photocatalytic material, wherein the tourmaline and reducing substance mixed powder layer are attached to the outer surface of the carbon cloth supporting body, and the modified photocatalytic material is attached to the surface of the tourmaline and reducing substance mixed powder layer. Microbes and a photocatalyst in the electrode have a coupling effect during degradation of wastewater; the modified photocatalyst has the visible-light response, and limitations on usage conditions of the photocatalyst are greatly reduced; tourmaline has pyroelectricity and piezoelectricity and can produce permanent weak current, the service life of hole-electron pairs produced on the surface of the photocatalytic material is prolonged under the effect of the current, and the photocatalytic efficiency is improved. Besides, tourmaline and reducing substance mixed powder can effectively ease transfer of holes-electrons or oxidized ions produced by photocatalysis to a biological membrane, and the activity of the microbes is guaranteed.

The invention discloses a circulating water direct connection waste heat supply and steam extraction heat supply coupled combined heat and power generation heat supply system in the technical field of pyroelectricity design and control. The system comprises a steam turbine intermediate pressure cylinder, a communicating pipe valve, a steam turbine low pressure cylinder, a cooling tower / air cooling island, a condenser, a heat supply steam extraction valve, a heating network heater, a near-end heating network and a far-end heating network, wherein an outlet of the steam turbine intermediate pressure cylinder is respectively communicated with an inlet of the steam turbine low pressure cylinder and an inlet of the heating network heater through the communicating pipe valve and the heat supply steam extraction valve; an outlet of the steam turbine low pressure cylinder is connected with an inlet of the condenser; an outlet of the condenser is respectively connected with an inlet of the cooling tower / air cooling island, an inlet of the near-end heating network and the inlet of the heating network heater; an outlet of the heating network heater is connected with an inlet of the far-end heating network; an outlet of the far-end heating network is merged with an outlet of the near-end heating network and then connected with the inlet of the condenser. The system reduces loss of a cold source and solves the problem that long-range transmission of circulating water direct connection waste heat supply cannot be achieved.

The invention discloses an intelligent invisible bed control system. The intelligent invisible bed control system comprises a bed body, a motive power part and a controller, wherein the controller comprises a single-chip main control module, a DC (Direct Current) power module, an infrared detection module, a micro-switch module and a manual switch module and / or a remote control receiver module; according to the invention, an output shaft of the motive power part directly drives the bed body to rotate so as to unfold the bed body for use and fold the bed body for invisibility; and the invisible bed can be controlled intelligently. The intelligent invisible bed control system is provided with multiple safety settings, such as a pyroelectricity infrared sensor, a resistance detector, a micro-switch, a remote control locker, an electronic controller and the like, to guarantee people from damage to the maximum limit, can be used for efficiently solving safety hazard that the conventional invisible bed control system in the market is easy to drop directly due to mechanical failure and solving various personal injury and property damage problems which are easy to happen to people due to incorrect manipulation of the conventional invisible bed control system and has higher safety performance.

The invention relates to a preparation method of a CDs / PVDF (Polyvinylidene Fluoride) composite thin film. The preparation method comprises the following steps: taking blue carbon quantum dots prepared from citric acid and diethylenetriamine through a hydrothermal method as fluorescent filler; combining the fluorescent filler with PVDF with excellent piezoelectric properties to obtain the CDs / PVDFcomposite thin film by a blending casting mode. By use of the CDs / PVDF composite thin film, the fluorescence self-quenching phenomenon of solid-phase carbon quantum dots is well avoided; the CDs / PVDFcomposite thin film retains excellent fluorescent characteristics of the carbon quantum dots as well as chemical corrosion resistance, high temperature resistance, oxidation resistance, weather fastness and ray radiation resistance; on the basis of combining original characteristics of the composite thin film with excellent piezoelectricity, dielectricity and pyroelectricity, a composite functional thin film material integrating luminous property with piezoelectricity is formed.

The invention relates to a single-crystal tellurium nanotube and a preparation method and application thereof. The preparation method of the single-crystal tellurium nanotube comprises the steps as follows: adding tellurium dioxide and poly vinyl pyrrolidone (PVP) into a glycol solution; agitating and heating the mixture till clarification; continuously heating the mixture to 180-230 DEG C; adding sodium hydroxide into the mixture and agitating for 5-60 minutes at the temperature of 180-230 DEG C to obtain the tellurium nanotube, wherein the weight ratio of the tellurium dioxide, the poly vinyl pyrrolidone (PVP), glycol and the sodium hydroxide is (0.16-0.64):(0.2-0.8):(55-112):(0.05-0.8). The prepared single-crystal tellurium nanotube is 170-460 nanometers in diameter, about 5.0-9.0 microns in length and 30-40 nanometers in wall thickness. The single-crystal tellurium nanotube can service as an in-situ template for compounding PbTe pyroelectricity nanotubes, Bi2Te3 pyroelectricity nanotubes and Sb2Te3 pyroelectricity nanotubes.

The invention discloses a dust catcher, which solves the problems of complex structure, gas obstruction caused by an active carbon filter screen and high possibility of blockage of solid granules in the conventional dust catcher. The dust catcher is provided with a grid packing (3), and a liquid sprayer (1) is arranged above the grid packing (3); the grid packing (3) is a packing layer with a three-dimensional gridding runner and consists of strip plates which are arranged in a row, and the strip plates are tilted with a horizontal plane; and the same rows of strip plates are parallel with each other, the inclination directions of the two adjacent rows of strip plates with the horizontal plane are opposite, and the two adjacent rows of strip plates are crossed mutually. The dust catcher is mainly used for dust removal in enterprises of petrochemical industry, pyroelectricity industry, steel industry and the like.