32results about How to "Implement multiple reflections" patented technology

The invention discloses an on-line measuring system and method for the concentration of NO3 free radicals in the atmosphere based on broadband cavity-enhanced absorption spectroscopy. The on-line measuring system at least comprises a light source controller, a light source, a first convex lens, a second convex lens, a pair of high-reflectivity lenses, a detection cavity, an optical fiber, a spectrometer and a zero-point generator. According to the invention, the pair of high-reflectivity lenses compose a resonant cavity, a LED is used as the light source, and the spectrometer is used as a detector; dynamic zero points are employed for elimination of the influence of other absorbed components on the measurement of NO3 free radicals, so on-line accurate measurement of the NO3 free radicals in the atmosphere is realized. The on-line measuring system and method provided by the invention have the characteristics of low detection limit, high sensitivity, high temporal-spatial resolution, high stability and low cost.

The invention discloses preparation and application of an alpha-fetoprotein photoelectrochemical competitive immunosensor based on a double-sensitized structure. A sensing interface is constructed byusing titanium dioxide mesocrystals as a probe substrate and immobilizing an alpha-fetoprotein antibody (Ab), and using bismuth sulfide as an electrode substrate and immobilizing an alpha-fetoproteinantigen; the sensor with the double-sensitized structure is constructed by means of specific binding between an antigen and the antibody. An electrode modified with the alpha-fetoprotein antigen is placed in a mixed solution containing different concentrations of free antigen and a certain amount of labeled probes, and the free target antigen competes with the immobilized antigen for bonding to the labeled probes. Under the illumination condition, the electrode bonded with the probes can generate photocurrent with certain intensity, and the amplification of a current signal is realized by means of the double-sensitized structure. Furthermore, as the concentration of the free target material increases, the number of the probes bonded to the immobilized antigen decreases, and the photocurrent intensity is also reduced. Based on the phenomenon, a photoelectric analysis method for alpha-fetoprotein can be established.

The invention provides an optical path folding device. Based on the confocal optical system consisting of a beam input end, an output end, a main plane mirror and a concave mirror, a tilted sub-mirroris introduced on the focal plane to change the reflection angle of the incident light beam, thereby achieving multiple reflections of the light beam in the confocal optical system. The output beam maintains the optical characteristics of the input beam and has a higher optical path volume ratio. Variable optical path can be achieved by rotating the tilted sub-mirror. Parallel input of multiple beams can be realized by adopting a fiber array collimator at the input end. A fiber array collimator is used at the input and output ends, and a part of the pigtail fiber is connected, so that the optical path can be connected in series to achieve a longer optical path.

The invention belongs to the field of laser gas sensing, and provides a high-efficiency optical path folding device and a miniaturized high-sensitivity gas sensor. The high-efficiency optical path folding device can realize multiple reflections of light beams, has a longer optical path and a higher optical path volume ratio, and is compact in size. The miniaturized high-sensitivity gas sensor caneffectively improve the accuracy and precision of the gas concentration measurement results by adopting the high-efficiency optical path folding devices provided in the first aspect and the second aspect, and has the advantages of long optical path, small size and stable optical path structure.

The invention discloses a tail end disinfection and water purification assembly with a water quality monitoring function and an application method and belongs to the field of tail end water purification. The tail end disinfection and water purification assembly comprises a fluid cavity, a sealing part and an optical detection module, which are connected in sequence, wherein the sealing part is provided with a water inlet; the fluid cavity is provided with a water outlet; the optical detection module comprises an ultraviolet LED (Light Emitting Diode) module, an LED circuit board and a fluorescent detection module; the LED circuit board is of a hollow circular ring structure; the ultraviolet LED module is mounted on a circular ring of the LED circuit board; the fluorescent detection moduleis mounted at a hollow part of the LED circuit board. The tail end disinfection and water purification assembly disclosed by the invention has the advantages of small volume, low cost, simple structure, easiness for installation, high sensitivity and good sterilization effect; the invention further provides a calibration application method of the tail end disinfection and water purification assembly.

The invention discloses a microwave ablation antenna based on a spiral gap structure. The microwave ablation antenna comprises a conical ablation needle head, and a semi-rigid coaxial needle rod; thefront end of the semi-rigid coaxial needle rod is connected with the tail end of the ablation needle head; an outer conductor behind the joint is provided with a plurality of optimizable spiral slitsfor radiation, and impedance matching and radiation are carried out without forming or forming a plurality of annular slits behind the spiral slits, so that energy is transmitted in the semi-rigid coaxial line and is efficiently radiated at the slits. According to the microwave ablation needle, microwave energy transmission consumption is low, energy is efficiently radiated at the spiral slits andmainly concentrated at the front end of the ablation antenna, backward radiation is effectively restrained, and therefore a novel structure is provided for minimally invasive or non-invasive microwave tumor treatment.

The invention discloses a preparation method of a modified silicon dioxide emulsion, which comprises the following steps: adding 5-8 parts by weight of modified silicon dioxide aerogel, 15-20 parts byweight of butyl acrylate, 12-18 parts by weight of styrene, 8-15 parts by weight of methacrylic acid, 5-10 parts by weight of emulsifier, 0.2-0.5 part by weight of initiator and 45-65 parts by weightof solvent, and stirring to react at 70-90 DEG C to obtain the modified silicon dioxide emulsion; and the invention also discloses a reflective insulation coating. The coating disclosed by the invention is composed of a double-layer structure, wherein an outer reflecting layer is mainly composed of fluorocarbon resin, hollow glass beads and a reflecting filler; an inner thermal insulation layer is mainly composed of polyurethane resin and silica aerogel, according to the invention, the solar reflectivity is as high as 90% or above, the heat conductivity coefficient is low, and external heat is effectively prevented from diffusing into the coating.

The invention discloses a folded-plate-shaped photovoltaic assembly, front glass used by the folded-plate-shaped photovoltaic assembly and a photovoltaic system. The folded-plate-shaped photovoltaic assembly comprises the front glass, a battery body and a back surface layer which are sequentially arranged from top to bottom, and the front glass and the back surface layer are respectively folded plate structures each of which is mainly composed of a plurality of V-shaped units connected in sequence. The V-shaped units of the front glass and the V-shaped units of the back surface layer correspond to each other up and down, and a space for accommodating the battery body is formed between the V-shaped units of the front glass and the V-shaped units of the back surface layer. According to the invention, under the condition of limited area, the overall light receiving area of the photovoltaic assembly can be improved; moreover, when sunlight irradiates the V-shaped units of the front glass,the sunlight can be reflected and incident for multiple times between the two inclined panels of each V-shaped unit, so that the energy absorption of the assembly to the sunlight is increased, and thepower generation capacity of the assembly is improved.

The invention provides a preparation method of a graphene aerogel, a Fe3O4 / graphene aerogel and a preparation method of the Fe3O4 / graphene aerogel, and belongs to the technical field of graphene aerogels. The preparation method of the graphene aerogel comprises the steps that an annealed porous silicon dioxide framework is placed at 1,100-1,300 DEG C, through a chemical vapor deposition method, graphene grows, and pretreated gel is obtained. The porous silicon dioxide framework in the pretreated gel is removed to obtain the graphene aerogel. The preparation method of the Fe3O4 / graphene aerogelcomprises the steps that the graphene aerogel and a dopamine solution are subjected to a hybrid reaction under the alkalescence condition to obtain a dopamine / graphene aerogel. Then through an alcohol-thermal reaction and calcining, the Fe3O4 / graphene aerogel is obtained. The graphene aerogel prepared by the preparation method is specific in structure and high in conductive performance and has few defects, and therefore the obtained Fe3O4 / graphene aerogel has better electromagnetic shielding performance.

The present invention provides a displacement sensor with refractor and capable of improving magnification times and a measurement method thereof. The displacement sensor comprises: a laser source configured to emit a laser beam, wherein the laser beam is incident into a reflection surface of a triangular wave reflector; a reflector set comprising at least two reflectors, wherein the reflectors are configured to receive laser beams reflected corresponding to the reflection surfaces and allow the received laser beams to be reflected again; the reflection surfaces configured to allow the laser beams emitted by the laser source or the laser beams reflected by the reflector to be reflected again; a refractor configured to receive the laser beams which are reflected by the reflection surfaces,do not received by the reflector set any longer and allow the laser beams to generate refraction; and a photoelectric detector configured to receive the laser beams refracted by the refractor and measure the incident positions of the laser beams. Through arrangement of the refractor, the angle of the laser incident to the photoelectric detector is reduced, and the displacement sensor can further improve the displacement measurement precision.

The invention discloses a wave absorbing integrated material of a gradient-pore type structure. The wave absorbing integrated material is composed of a base material, surface pores and a coating, and is characterized in that the pores are evenly formed in the surface of the base material, and the pore rate is increased along with the increase of the distance from the surface of the base material. The base material is carbon, or silicon carbide or a composite material formed by mixing the carbon and the silicon carbide, the depth of each pore is 1-10mm, the pores account for 5-40% of the area of the surface of the base material, the pores are parallel, or perpendicular to one another, or bent, the cross section of each pore is round, or irregular round, and the diameter of each pore is 0.1-1mm. The coating is a silicon carbide coating, or a silicon nitride coating, or an iron oxide coating, or a multi-layer coating or a trapezoid coating formed by two or more coatings, and the thickness of the coating is 10-100 micro meters. The wave absorbing integrated material has good wave absorbing performance and mechanical property.

The invention discloses an assembled angle-adjustable folded-plate-shaped photovoltaic module and a photovoltaic system thereof. The photovoltaic module comprises front glass, a battery string formedby connecting a plurality of solar cells and a back plate, which are sequentially arranged from top to bottom. The front glass and the back plate are respectively of a folded plate structure which ismainly composed of a plurality of V-shaped units which are connected in sequence, the V-shaped units of the front glass and the V-shaped units of the back plate correspond to each other up and down, spaces for placing the solar cells are formed in inclined panels which form the V-shaped units, and the solar cells face the corresponding inclined panels; the two inclined panels of each V-shaped unitare hinged, that is, each inclined panel of the front glass and each inclined panel of the back plate corresponding to each other up and down and the solar cell between the inclined panels form a spliced unit; and an angle adjusting mechanism for adjusting an included angle is arranged on each V-shaped unit. The assembled angle-adjustable folded-plate-shaped photovoltaic module is of a folded-plate-shaped structure, the included angle of each V-shaped unit is adjustable, and the generating capacity of the module is improved; and the module is formed by splicing the spliced units, so that themodule is convenient to store and transport, and repair and replacement of the module are facilitated.

The invention relates to a preparation method and using method of a bromine-oxygen-bismuth photocatalytic composite material for oily sewage treatment. Bismuth nitrate, potassium bromide and metasilicate are proportioned according to a certain raw material ratio, a reaction is carried out in an ethanol-ethylene glycol mixed solvent for 12-24 hours, and separating, drying and grinding are carried out, so that the bromine-oxygen-bismuth photocatalytic composite material is obtained. During use, 0.01-0.1% of the bromine-oxygen-bismuth photocatalytic composite material is added into 100-3000 mg / Lof sewage, and the sewage is stirred and exposed under sunlight for 2-5 hours, so that 93% or more of oil can be removed. The preparation method has the characteristics of easily available raw materials, simple production process and the like, and the product has a simple use method, can be recycled, and does not cause secondary pollution.

The application provides a preparation method of graphene airgel, Fe 3 o 4 A graphene airgel and a preparation method thereof belong to the technical field of graphene airgel. The preparation method of the graphene airgel comprises: placing the annealed silicon dioxide porous framework at a temperature of 1100-1300° C. and growing graphene by a chemical vapor deposition method to obtain a pretreatment gel. The graphene airgel is obtained by removing the silica porous framework in the pretreated gel. Fe 3 o 4 A method for preparing the graphene airgel, comprising: mixing and reacting the graphene airgel and a dopamine solution under weak alkaline conditions to obtain the dopamine / graphene airgel. Fe was then obtained by alcohol thermal reaction and calcination 3 o 4 / Graphene airgel. The graphene airgel obtained by the above method has a special structure, fewer defects, and high electrical conductivity, so the obtained Fe 3 o 4 / Graphene airgel has better electromagnetic shielding performance.

An II type superlattice photoelectric detector possessing an absorption enhancement structure and a manufacturing method thereof are disclosed. The manufacturing method comprises the following steps of carrying out molecular-beam epitaxial growth on a substrate so as to form an absorption enhancement layer; carrying out molecular-beam epitaxial growth on an upper surface of the absorption enhancement layer so as to form an absorption layer, wherein the absorption layer is an N structure II type superlattice structure; and completing manufacturing of the II type superlattice photoelectric detector possessing the absorption enhancement structure. In the invention, through adopting an N structure II type superlattice material as the absorption layer and simultaneously introducing the absorption enhancement layer, a device can acquire 80% of high quantum efficiency at a target wave length position and a good narrow bandwidth characteristic is embodied nearby a target wave length.

The invention discloses a core-shell Ni / Co alloy and nitrogen-doped carbon-based wave-absorbing composite material and a preparation method thereof.The preparation method comprises the steps that firstly, a Ni / Co-MOF precursor is prepared through a simple hydrothermal reaction, and then the core-shell Ni / Co-C composite wave-absorbing material is obtained through high-temperature treatment in an argon inert environment; when the thickness of the composite wave-absorbing material is 3.5 mm, the frequency is 8.9 GHz, and the optimal effective wave-absorbing bandwidth (RL) value can reach-71.9 dB, RLlt; the effective wave-absorbing bandwidth of-10 reaches up to 16 GHz, S, C, X and Ku frequency bands are covered, and due to the fact that a core-shell structure with nickel and cobalt wrapped by carbon is formed, the material has good stability. The wave-absorbing material prepared by the method disclosed by the invention is environment-friendly, good in stability, relatively wide in wave-absorbing bandwidth, high in reflection loss, simple in process and suitable for large-scale production.

The invention relates to the technical field of chemical vapor deposition, and provides a femtosecond laser pre-dissociation device, which comprises a femtosecond laser dissociation module and a highRydberg atomic detection module, the femtosecond laser dissociation module and the high Rydberg atomic detection module are connected through a first pipe, and the first pipeline is provided with a valve. The invention further provides chemical vapor deposition equipment, which comprises a reaction gas supply source, a reaction cavity and the femtosecond laser pre-dissociation device. According tothe invention, the reaction gas is catalyzed and dissociated in advance by the femtosecond laser dissociation module, the reaction gas is dissociated into CH2 or CH before entering the reaction cavity, so that the production efficiency is greatly improved and the pollution to the air is reduced, the components of the gas such as H2, CH3, CH2 or CH and the like are analyzed by the high Rydberg atomic detection module and fed back to the femtosecond laser dissociation module for real-time adjusting the optimized power density and the time domain distribution so as to better control the processof the catalytic reaction.

The invention relates to a sound absorption and noise reduction device, and particularly relates to the sound absorption and noise reduction device. The sound absorption and noise reduction device comprises fixed frame plates, anti-collision sound-absorption assemblies and sound attenuation blocks, wherein each fixed frame plate comprises a rear sound absorbing plate, a left fixed plate, a right fixed plate and a plurality of sound wave reflection columns; the left end and the right end of each rear sound absorbing plate are respectively connected with the corresponding left fixed plate and the corresponding right fixed plate; the plurality of sound wave reflection columns are uniformly arranged on the front end surface of the corresponding rear sound absorbing plate; each sound wave reflection column comprises a support column and a polygonal pyramid; each polygonal pyramid is fixedly connected to one end of each support column and the other end of each support column is fixedly connected to each rear sound absorbing plate; the plurality of anti-collision sound-absorption assemblies are arranged between one corresponding left fixed plate and one corresponding right fixed plate; the quantity of the anti-collision sound-absorption assemblies is identical to that of the sound wave reflection columns. The sound absorption and noise reduction device has the beneficial effects thatan optimal sound absorption and noise reduction effect is achieved, and a buffer effect on the sound absorption and noise reduction device can be achieved when the sound absorption and noise reductiondevice is hit.

The invention discloses a preparation method of a mesoporous reduced graphene oxide absorbent, and belongs to the technical field of preparation of wave-absorbing materials. Comprising the following steps: 1) preparing a reducing agent aqueous solution with certain concentration; 2) weighing a certain mass of graphene oxide powder and adding the graphene oxide powder into a reducing agent water solvent; (3) heating the solution in the step (2) in an air dry oven; 4) after heating is finished, washing the product with deionized water to remove redundant reducing agent; and 5) carrying out freeze-drying treatment on the cleaned product, and grinding the freeze-dried product to finally obtain mesoporous reduced graphene oxide powder. According to the mesoporous reduced graphene oxide prepared by the method, multiple reflection of electromagnetic waves in the material is realized, multiple loss of the electromagnetic waves is realized under the action of a structural defect polarization center, and finally, the mesoporous reduced graphene oxide shows excellent electromagnetic wave loss performance.

The invention discloses a microwave ablation antenna based on a spiral slot structure. The microwave ablation antenna includes a conical ablation needle, a semi-rigid coaxial needle rod, the front end of the semi-rigid coaxial needle rod is connected to the end of the ablation needle, and several optimized spirals are formed on the outer conductor behind the connection. The slots radiate, and there are no or several annular slots behind the helical slots for impedance matching and radiation. The energy is transmitted in the semi-rigid coaxial line and radiated efficiently at the slots. The microwave ablation needle of the present invention has low microwave energy transmission consumption, and the energy radiates efficiently at the helical gap, mainly concentrated at the front end of the ablation antenna, effectively suppressing the backward radiation, thereby providing a new structure for minimally invasive or non-invasive microwave tumor treatment.

The invention discloses preparation and application of an alpha-fetoprotein photoelectrochemical competitive immunosensor based on a double-sensitized structure. A sensing interface is constructed byusing titanium dioxide mesocrystals as a probe substrate and immobilizing an alpha-fetoprotein antibody (Ab), and using bismuth sulfide as an electrode substrate and immobilizing an alpha-fetoproteinantigen; the sensor with the double-sensitized structure is constructed by means of specific binding between an antigen and the antibody. An electrode modified with the alpha-fetoprotein antigen is placed in a mixed solution containing different concentrations of free antigen and a certain amount of labeled probes, and the free target antigen competes with the immobilized antigen for bonding to the labeled probes. Under the illumination condition, the electrode bonded with the probes can generate photocurrent with certain intensity, and the amplification of a current signal is realized by means of the double-sensitized structure. Furthermore, as the concentration of the free target material increases, the number of the probes bonded to the immobilized antigen decreases, and the photocurrent intensity is also reduced. Based on the phenomenon, a photoelectric analysis method for alpha-fetoprotein can be established.

The invention discloses a device and method for improving performance of a photoacoustic spectral trace gas sensor. The device comprises a pulsed laser, a laser collimation system, a thin film polarizer, a first right angle prism, a Pockels cell, a photoacoustic cell, a second right angle prism, a preamplifier, a control and data acquisition system, and a computer, wherein the pulsed laser, the laser collimation system, the thin film polarizer, the first right angle prism, the Pockels cell, the photoacoustic cell and the second right angle prism are sequentially set in the beam propagation direction; a microphone is disposed in the photoacoustic cell and connected to the preamplifier; the preamplifier is connected to the control and data acquisition system; and the control and data acquisition system is connected to the computer. The device and method provided by the invention utilize a Pockels cell to change the polarization state of the laser and two right angle prisms to achieve multiple reflections of the beam.

The invention relates to the technical field of chemical vapor deposition, and provides a femtosecond laser pre-dissociation device, which comprises a femtosecond laser dissociation module and a highRydberg atomic detection module, the femtosecond laser dissociation module and the high Rydberg atomic detection module are connected through a first pipe, and the first pipeline is provided with a valve. The invention further provides chemical vapor deposition equipment, which comprises a reaction gas supply source, a reaction cavity and the femtosecond laser pre-dissociation device. According tothe invention, the reaction gas is catalyzed and dissociated in advance by the femtosecond laser dissociation module, the reaction gas is dissociated into CH2 or CH before entering the reaction cavity, so that the production efficiency is greatly improved and the pollution to the air is reduced, the components of the gas such as H2, CH3, CH2 or CH and the like are analyzed by the high Rydberg atomic detection module and fed back to the femtosecond laser dissociation module for real-time adjusting the optimized power density and the time domain distribution so as to better control the processof the catalytic reaction.

The invention discloses a layered double magnetic metal hydroxide derived magnetic metal and carbon composite wave-absorbing material and a preparation method thereof, the layered double magnetic metal hydroxide (LDH) is used as a precursor, and the magnetic metal and carbon composite wave-absorbing material with a multi-dimensional, multi-level and porous structure is synthesized through subsequent heat treatment. The preparation method is simple in process and low in cost, large-scale industrial production can be achieved, and the prepared composite wave-absorbing material is small in density, small in thickness, wide in effective absorption frequency band and high in reflection loss.

The invention discloses a device and method for improving the performance of a photoacoustic spectrum trace gas sensor. The device includes a pulse laser, a laser collimation system, a thin film polarizer, a first rectangular prism, a Pockels cell, a photoacoustic pool, The second right-angle prism, preamplifier, control and data acquisition system and computer, the pulsed laser, laser collimation system, film polarizer, first right-angle prism, Pockels cell, photoacoustic cell, second right-angle prism The direction of beam propagation is set in sequence; a microphone is set in the photoacoustic pool; the microphone is connected to a preamplifier; the preamplifier is connected to a data acquisition system; the control is connected to a data acquisition system and a computer. The invention uses a Pockels cell to change the polarization state of laser light and two rectangular prisms to realize multiple reflections of light beams.

The invention provides a drop-out fuse with a wireless passive temperature sensing device. The drop-out fuse comprises a drop-out fuse body and a clamping sleeve mounted on the drop-out fuse body; a temperature sensor is mounted on the clamping sleeve; the temperature sensor comprises a metal casing, an RFID tag antenna and an RFID temperature measuring chip; the RFID tag antenna is mounted in themetal casing; the RFID temperature measuring chip is mounted on the metal casing and penetrates through the RFID tag antenna; the RFID tag antenna is internally provided with a mounting cavity; a metal inner ring is mounted in the mounting cavity; a plurality of sponge pads are arranged on the side, close to the RFID tag antenna, of the metal inner ring; the sponge pads are in contact with the RFID tag antenna; the metal inner ring is internally filled with a sponge filling layer; a metal rod is mounted in the metal inner ring; and a support plate is connected between the metal rod and the RFID tag antenna. According to the device, the recognition distance between a tag and an external reader is improved, the detection stability is good, and the detection data is reliable.