60 results about "Resonant absorption" patented technology

The invention discloses a preparation method of a flexible infrared super-surface absorber based on MDM, and belongs to the field of micro-nano machining patterning. The method comprises the following steps: pretreating a polymer material; depositing a layer of bottom metal film on the pretreated substrate by adopting magnetron sputtering; a metal reflecting layer, a dielectric insulating layer and a metal surface functional layer are sequentially deposited through magnetron sputtering, a periodic nano microstructure is constructed on the surface of a flexible composite film, a nano round pit array is etched in situ on a surface metal layer of an MDM structure by using a femtosecond laser selective etching process, and an MDM laminated structure is formed. According to the invention, stable integration of the MDM structure and the flexible substrate can be realized, and meanwhile, high absorptivity and good flexibility of the device in an infrared band are ensured. The absorber prepared by the invention can generate resonance absorption on incident infrared electromagnetic waves through a surface plasmon and F-P cavity resonance coupling mechanism, and meanwhile, the characteristic size variation is changed through physical excitation, so that effective absorption and frequency regulation of the electromagnetic waves at the infrared band of 3-14 microns are realized.

The application belongs to the field of heavy metal detection, and discloses a coal-fired heavy metal detection and analysis device and method based on LIBS-LAAS, which comprises a pulsed laser excitation unit, a wavelength-tunable continuous laser resonance absorption unit, a coaxial signal acquisition unit, a paraxial signal acquisition unit, a control and analysis unit and a displacement detection platform; the pulsed laser excitation unit comprises a pulsed laser, which emits pulsed laser and ablates a sample to generate plasma; the wavelength-tunable continuous laser resonance absorption unit comprises a wavelength-tunable continuous laser for emitting continuous laser to the plasma; the coaxial signal acquisition unit comprises a first spectrometer, which acquires LAAS absorption spectrum information of the continuous laser passing through the plasma. Through the application, the interference of the spectrum line overlap of the LIBS detection of heavy metal elements can be broken through, the spectrum information of multiple heavy metal elements in the coal sample can be acquired at the same time, the rapid detection and analysis of the heavy metal elements can be realized, and the accuracy of the heavy metal detection and analysis result is improved.

The invention discloses a method for synthesizing a ZnFe2O4 photocatalyst based on ferromagnetic resonance absorption effect mediation. The synthesis method comprises the following steps: dissolving Zn (NO3) 2.3 H2O and Fe (NO3) 3.9 H2O in deionized water, and stirring to obtain a mixed solution; adding a NaOH solution to adjust the pH value; continuously heating and stirring, filtering after low-power short-time microwave heating, washing with water until the pH value of supernate is 7, and naturally drying; and continuously calcining the dried product, and then carrying out low-power short-time microwave heating to obtain the ZnFe2O4 photocatalyst with the specific surface area of 49.3-50.6 m < 2 > / g, the visible light absorption range of 580 nm and the saturation magnetization of 46.5-47.33 emu / g. The obtained photocatalyst is large in specific surface area, high in visible light absorption capacity, low in photogenerated charge recombination efficiency, easy to separate and recycle, high in photocatalytic capacity and capable of effectively removing norfloxacin in wastewater.

To provide a metasurface structure and gas sensor that can accurately detect targets at low concentrations of 1 ppm or less contained in gas. [Solution] Light in the ultraviolet region is irradiated onto the substrate 2 and the metal part 3 on the substrate 2, and only specific wavelengths are absorbed and reflected by surface plasmon resonance, and the gas to be detected is provided near the metal part 3. The aspect ratio of the gap between adjacent metal parts 3 along the x-axis on the substrate 2 is set to 55 / (300-10) or more and 100 or less. The aspect ratio qy of the gap between adjacent metal parts 3 along the y-axis on the substrate 2 is set to 55 / (800-163) or more and 100 / (300-296) or less. The filling factor of the metal part 3 along the x-axis on the substrate 2 is set to 10 / 300 or more and 0.99 or less. The filling factor of the metal part 3 along the y-axis on the substrate 2 is set to 163 / 800 or more and 296 / 300 or less.

The invention provides a microwave control method and a microwave controller for an electron paramagnetic spectrometer. The microwave control method for the electron paramagnetic spectrometer comprises the following steps: controlling a microwave source to generate a microwave signal for paramagnetic resonance detection; a first power division signal and a second power division signal are obtained through distribution; inputting the first power division signal into a resonant cavity, detecting a reflection signal of the resonant cavity after resonance absorption of the to-be-detected sample to obtain a first detection signal, and performing phase shift on the second power division signal to obtain an orthogonal local oscillation signal; performing frequency mixing on the first detection signal and the local oscillator signal to obtain an I down-conversion signal and a Q down-conversion signal; performing data processing to obtain detection result information; and error analysis is performed and the microwave source is corrected, so that the frequency of the output microwave signal is kept at the first working frequency. By establishing a feedback loop from output to microwave signal input of the microwave source, feedback control of microwave signals is realized, and high-precision microwave control in the electron paramagnetic spectrometer is further realized.

The invention discloses an out-of-band wave-absorbing electromagnetic window based on transverse quasi-cavity resonance, and relates to the technical field of artificial electromagnetic materials. An impedance layer is arranged and forms a series resonance circuit, so that incident electromagnetic waves excite transverse quasi-cavity resonance on metal wires of inductance structure units, absorption of low-frequency-band electromagnetic waves (C wave band) is achieved, and the electromagnetic window has the advantages of being simple in structure, low in cost and high in efficiency. Then, incident and reflected electromagnetic waves excite a surface plasmon polariton (SSPP) mode on the metal grid bars, so that energy is located in gaps of the metal grid bars and the second dielectric substrate, and the second dielectric substrate realizes absorption of high-frequency electromagnetic waves (Ku wave band), namely, compatible synergistic absorption of low-frequency resonance absorption of the impedance layer and high-frequency SSPP mode absorption of the high-frequency wave-absorbing structure is realized; meanwhile, efficient transmission of a middle wave band (X wave band) is achieved through the frequency selection surface on the lowermost layer, and finally absorption and transmission integration of vertical resonance regulation and transverse electromagnetic coupling is achieved under a wide frequency band.

The application discloses molybdenum-doped nano zinc oxide with high visible light photocatalytic performance and a preparation method and application thereof. The molybdenum-doped nano zinc oxide is prepared from 1-octadecene, 1-dodecanol, oleic acid, a zinc source and a molybdenum source through vacuum degassing treatment, uniform stirring under a nitrogen atmosphere, heating to 100-140 DEG C, keeping warm until solid particles are dissolved, heating to 220-250 DEG C, keeping warm for 0.5-1 h of reaction, and cooling, washing and drying. The molybdenum-doped nano zinc oxide produces a local surface plasmon resonance absorption peak in the range of 600-700 nm through molybdenum ion doping, and the nano powder has a diameter of 5-20 nm; and the visible light photocatalytic performance of the zinc oxide material is greatly improved under the condition of visible light.

The utility model discloses a detachable exhaust duct silencer, which relates to the technical field of silencers and comprises a frame plate mechanism, detachable sealing mechanisms are arranged on two sides of the frame plate mechanism, and a silencing resonance mechanism is inserted into the frame plate mechanism. In order to solve the problems that in the prior art, due to the fact that a silencer is prone to being blocked and needs to be replaced and maintained, forked pipes and single connecting pipes are arranged on the two sides of a frame plate mechanism, the airflow speed is reduced, local turbulence noise caused by airflow bias is avoided, a combined noise reduction scheme of source control and tail end treatment is formed, and the noise reduction efficiency is greatly improved by disassembling the corresponding arrangement of a sealing mechanism and a noise elimination resonance mechanism. The two sides of the frame plate mechanism can be opened for maintenance, the micro-perforated cylinder plates form a resonance structure through micro-holes in the plates and cavities formed by separation of the separation insertion plates, the micro-perforated cylinder plates are arranged in a staggered mode, and sound energy is absorbed through resonance of air columns at the small holes.

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

The application discloses a radar-sound compatible absorbing superstructure and a preparation method thereof, and belongs to the technical field of sound-absorbing and wave-absorbing materials.The superstructure is formed by fusing and depositing 3D printing of a wave-absorbing material, has three-dimensional gradient composition and a multistage pore structure, the multistage pore includes micro-pore and macro-pore structure, and the macro-pore structure is a space folding inclined pore.Micro-pores and macro-pores are simultaneously constructed in the superstructure, the composite effect of the micro-pores and the macro-pores is utilized to form resonance absorption peaks at different frequencies, the problem of excessive thickness / volume of a traditional radar-sound compatible absorbing material is solved, different direction incident electromagnetic waves can be fully contacted with the absorber, omnidirectional multistage reflection is realized, the folding multistage inclined pore can extend the propagation path of sound waves and radar waves without increasing the thickness of the structure, multiple reflections are formed in the folding channel, and thus sharp wave dissipation is caused in the channel.

The present invention discloses an intelligent reverse design for accelerating materials for robot-assisted automatic characterization of nanocrystals. Specifically, the following design methods are disclosed: S1) using a high-throughput preparation platform to conduct small-dose experiments; S2) constructing a small-dose experimental database; S3) designing a decision optimization disk; S4) detecting the longitudinal plasmon resonance absorption peak, absorbance ratio, and half-maximum width of the nanocrystals obtained under different reaction conditions using the decision optimization disk, and selecting the experimental conditions that are closest to the target morphological characteristics as further amplification conditions; S5) conducting amplification experiments and obtaining the morphological characteristics of the nanocrystals in each group of experiments; S6) establishing an equation between the reaction volume in the step-by-step method and the corresponding morphological characteristic parameters. The present invention implements intelligent reverse design by implementing robot-assisted automatic characterization of nanocrystals in nanocrystal amplification experiments.

The invention relates to an electromagnetic wave absorbing structure, in particular to a three-dimensional circular ring array wave absorbing structure, and belongs to the field of electromagnetic wave absorbing materials. According to the three-dimensional circular ring array wave-absorbing structure, by designing the three-dimensional hollow circular rings, resonance absorption of electromagnetic waves and multiple scattering and path dissipation are increased, meanwhile, the volume ratio of a wave-absorbing medium is reduced, and compared with a traditional flat plate wave-absorbing material, the three-dimensional circular ring array wave-absorbing structure has the advantages of being light in weight, excellent in wave-absorbing performance and the like; the dielectric substrate layer and the three-dimensional circular ring array wave-absorbing layer are integrally formed, compared with an existing three-dimensional structure wave-absorbing body, the wave-absorbing structure is easier to prepare and covered with the wave-transparent protection layer, the overall appearance of the wave-absorbing structure is of a flat plate structure, the low-frequency wave-absorbing performance and the structural stability of the wave-absorbing structure are effectively improved, and the wave-absorbing structure is suitable for the field of wave-absorbing materials.

The invention discloses a radar wave absorbing rubber patch with a periodic grid structure and a preparation method of the radar wave absorbing rubber patch, and belongs to the technical field of wave absorbing materials. According to the wave-absorbing rubber patch, a female and male mold structure is formed by rubber three-dimensional periodic structure units with wave-absorbing performance and rubber three-dimensional periodic structure units with wave-transmitting performance, and the planar rubber patch is formed through integral vulcanization. By utilizing the characteristic that the impedance of the wave-transparent structure unit is close to the air impedance, electromagnetic waves efficiently enter the wave-absorbing structure unit, multiple times of reflection, scattering, interference and resonance absorption of the electromagnetic waves are realized through a complex cavity in the wave-absorbing unit, and the problems that a traditional wave-absorbing patch is single in energy loss mode and insufficient in absorption intensity are solved. The wave-absorbing rubber patch has the characteristics of wide wave-absorbing frequency band, high absorption strength, strong designability, good processability, excellent bearing performance and the like, and the preparation process of the wave-absorbing rubber patch is strong in adaptability, easy to control and suitable for the fields of military stealth, civil electromagnetic protection, electromagnetic interference resistance and the like.

The utility model relates to the technical field of injection pumps, and discloses a low-noise injection pump set which comprises a motor, a pump head is fixedly installed on one side of the motor, and an output shaft of the motor is fixedly connected with the input end of the pump head. The protection structure is arranged outside the pump head and used for reducing noise, the multiple sound absorption plates are installed on the inner wall of the cover body, interference channels are formed through the extending parts on the two sides of the sound absorption plates, the uneven interference faces are formed on the inner wall of the cover body, sound waves generated when an impeller impacts liquid can be gradually absorbed by the interference faces, and propagation and diffusion of the sound waves are restrained; the split cover body facilitates later-stage additional installation of the protection structure, meanwhile, the acoustic board and the extension part are conveniently and independently replaced after being aged and damaged, the closed structure of the cover body prevents noise from directly leaking out, gaps of the acoustic board and the interference groove absorb energy through cavity resonance and surface reflection, and the noise reduction effect is achieved. Medium-high frequency noise is absorbed through reflection and cavity resonance.

A method and apparatus for detecting a low altitude unmanned micro-aircraft (UAV) is described. The method includes recording acoustic signals caused by mechanical vibrations of the motor and rotation of the propeller. The method is characterised in that, in addition, the optical signal of the UAV in the range of visible light (0.4... 0.76 [mu] m) and / or infrared light (0.76 [mu] m... 1 mm) is recorded, the occurrence of optical signal parameter modulation caused by these identical mechanical vibrations is detected, and the presence of a correlation of the acoustic and optical signals of the UAV is recorded, the presence of which indicates the detection of the UAV. The device (1) comprises:-a passive acoustic sensor (2),-a passive optical sensor (4), and-a correlator (3), and-an active acoustic sensor (5) adapted to operate at wavelengths at which acoustic waves resonate and scatter on the UAV, with a frequency range of 10... 20 kHz, and-an active radar sensor (6) adapted to operate at wavelengths at which the acoustic waves resonate and scatter on the UAV. The active radar sensor works at the wavelength corresponding to the signal resonance absorption wavelength in the atmosphere, the range is (1mm... 15mm), and the active radar sensor detects the UAV with the flight height of 5m... 50m.

The invention discloses a scanning imaging system based on an exciton resonance absorption principle. The system is composed of a semiconductor sample with exciton resonance absorption characteristics, an excitation light source, a mechanical chopper, an optical microscopic system, a displacement table, a photoelectric detector, a lock-in amplifier and a computer. The excitation light source provides narrow-band light with a specific central wavelength, the narrow-band light is irradiated to a semiconductor material sample with an exciton resonance absorption characteristic through the optical microscopic system or the lens group, and the position of the narrow-band light excitation sample is controlled through the displacement table. The narrow-band light reflected or transmitted by the semiconductor material is incident on the photoelectric detector through the optical microscopic system, and the computer processes the obtained electric signal to obtain a carrier distribution two-dimensional image in the surface of the semiconductor sample. The method has the characteristics and advantages of simple system structure, low cost and carrier dynamics visualization.

Interferometric element (IE) intended for a device for detecting at least one compound (C) exhibiting resonant absorption over a predetermined spectral region centered on a resonance wavelength, said interferometric element comprising a detection subset (DS) optimized for said resonance wavelength and comprising: a plurality of resonant Fabry-Pérot type optical cavities at said resonance wavelength, each cavity comprising a reflective layer (RS) at said resonance wavelength and a partially transparent layer (TS) at said resonance wavelength, the partially transparent layer of the sensitive cavities being permeable to the compound(s) to be detected (C); an encapsulation layer impermeable to the compound(s) to be detected (C) and encapsulating a first subset of optical cavity(ies), called reference cavities,so that each reference cavity is devoid of said compound to be detected between the reflective layer (CR) and the partially transparent layer, the encapsulating layer not encapsulating a second subset of optical cavity(ies), called sensitive cavities, so that each sensitive cavity can include the compound(s) to be detected (C) between the reflective layer (CR) and the partially transparent layer. [Fig. 1]

The application discloses a kind of based on 3D printing metamaterial mid-infrared gas sensor and preparation method thereof.The application is printed on the periodic arrangement of column arm unit on substrate using 3D printing technology, and metal film is deposited on its surface, to realize the narrow-band resonance absorption of specific wavelength mid-infrared light.The application can be adjusted by the geometric parameter and arrangement mode of column arm unit, and the absorption characteristics of sensor in mid-infrared wave band are optimized, so that it can produce resonance response to the characteristic absorption peak of target gas, thereby significantly improving the sensitivity and selectivity of gas detection.Compared with traditional planar nanostructure, the optical performance of the sensor structure design of the application is greatly improved, and it has the advantages of miniaturization, rapid response, high sensitivity and excellent gas selectivity, and can be widely used in environmental monitoring, industrial emission monitoring and safety detection and other fields.

The application discloses a kind of for low frequency broadband high-efficiency sound absorption metamaterial unit and its superstructure module, and the metamaterial unit includes the metamaterial cavity enclosed by multiple blocks of wall and the acoustic waveguide channel being arranged in the metamaterial cavity, acoustic waveguide channel is provided with impedance high-efficiency modulation sound absorption body, impedance high-efficiency modulation sound absorption body includes high porosity sound absorption medium and impedance modulation channel.The introduction of impedance modulation channel can effectively change the acoustic characteristics of high porosity sound absorption medium, by changing the geometric configuration of impedance modulation channel, can be widely modulated acoustic impedance, while producing resonance absorption peak in low frequency band, so as to significantly improve the sound absorption performance in low frequency band.A plurality of metamaterial units with different low-frequency high-efficiency absorption performance are connected in parallel, and through the coupling effect between the metamaterial units, a metamaterial module with low-frequency broadband high-efficiency sound absorption and noise reduction performance can be formed, thereby realizing low-frequency broadband high-efficiency sound absorption performance.

This invention discloses a mid-to-low frequency ventilation and sound insulation metamaterial comprising two main areas: sound absorption and ventilation. The sound absorption area is divided into inner and outer rings, each composed of multiple circumferentially arranged sound-absorbing functional cavities. Each functional cavity includes a resonant cavity formed by partitions and a perforated cavity formed by micro-perforated plates. The perforations on the plates are positioned according to the centroid of the vertical projection of the functional cavities. The ventilation area is a cylindrical region enclosed by the inner ring functional cavities, forming a complete resonant cavity via a ring-shaped base plate. This material combines the resonant characteristics of a Helmholtz resonator, achieving mid-to-low frequency broadband sound insulation through multiple parallel HR combinations. The hollow tube design ensures ventilation, and the mid-to-low frequency band utilizes a non-local coupling sound absorption mechanism for sound insulation. A 4.6cm thick specimen can block 90% of incident wave energy (TL≥10dB) in the 435~1700Hz range, and customized designs can be achieved simply by adjusting the aperture. The improved design incorporates a connecting small hole in the center of the inner and outer functional cavity partitions to form a connected functional cavity, bridging the gap between resonance absorption peaks and enhancing low-frequency sound absorption. The improved unit can achieve the same sound insulation effect in the range of 385~1700Hz.

The application relates to the field of layered composite materials, and particularly discloses a material plate compatible with electromagnetic waves and underwater acoustic waves, which comprises a composite absorption layer and an underwater acoustic absorption layer; wherein the composite absorption layer comprises an electrically conductive substrate and a plurality of layers of alternately stacked sound absorption material plates and wave absorption functional plates, the wave absorption functional plate is composed of a dielectric substrate and a patterned resistive film; and the underwater acoustic absorption layer is a viscoelastic material matrix embedded with a cavity structure. Wideband resonant absorption and impedance matching of electromagnetic waves are realized through multi-size resistive film patterns, and the sound absorption material plates and the cavity-matrix in the underwater acoustic absorption layer are used in cooperation to preliminarily consume and deeply dissipate underwater acoustic waves. The application improves the impedance mismatching problem of underwater acoustic absorption and electromagnetic absorption, has the advantages of wideband, high efficiency and compact structure, and is suitable for radar and sonar compatible stealth skins of equipment such as ships and cross-medium vehicles.

The utility model provides a pixel structure and an infrared detector, relates to the technical field of infrared detectors, and aims to improve the infrared absorption capability of the detector. The pixel structure comprises bridge arms, bridge piers and a bridge floor. The bridge floor is connected with the piers through the bridge arms. The bridge surface comprises an infrared absorption layer and an enhanced absorption layer above the infrared absorption layer, the enhanced absorption layer comprises a metasurface structure and a conductive structure, the conductive structure is connected with the bridge arms, and the conductive structure is further connected with the infrared absorption layer. According to the pixel structure, the enhanced absorption layer composed of the metasurface structure and the conductive structure is added on the infrared absorption layer, so that the infrared absorption efficiency of the pixel structure can be enhanced. Resonance absorption of infrared radiation of a specific wave band can be achieved by regulating and controlling the surface plasmon effect, and the responsiveness of the pixel structure to an infrared spectrum is remarkably improved. And the preparation of the enhanced absorption layer is highly compatible with the preparation process of the existing pixel, only the pattern of the single-layer mask plate needs to be adjusted, no additional process needs to be added, and the practicability and the mass production potential are improved.

The utility model discloses a shock absorption and sound absorption cotton structure for an automobile, and relates to the technical field of shock absorption and sound absorption cotton, the shock absorption and sound absorption cotton structure comprises an outer top plate, an inner sound absorption mechanism is fixedly connected below the outer top plate, and a plurality of groups of fixed rotating seats are fixedly connected above the inner sound absorption mechanism; through the telescopic synergistic effect of the multiple sets of damping rods and the supporting springs, directional attenuation is conducted on vibration energy perpendicular to the outer top plate, and energy dispersion caused by multi-degree-of-freedom vibration is avoided; a double-side rotating seat, a first damping rod and a second damping rod are matched, a multi-stage dissipation path of vibration energy in the vertical direction is formed, the damping efficiency is remarkably improved, the vibration energy enters the sound absorption cotton layer in a directional mode through the hard dense-hole bottom plate, and high-frequency noise attenuation is achieved; the high-density sponge layer absorbs low and medium frequency sound waves through pore resonance, the aluminum foil layer forms a sound and heat isolation barrier through the dual functions of sound reflection and heat radiation blocking, and finally the integrity of a sound wave gradient attenuation path is guaranteed through supporting of the rubber supporting columns.

A diffraction device (10) comprises: a flow path element (12) in which a flow path through which a gas flows is formed; and an excitation light source unit (20) for irradiating the gas flowing through the flow path formed in the flow path element with a plurality of excitation laser beams, wherein the flow path element (12) has a first flow path (41) which extends along a first direction and through which a first gas (V1) containing molecules that resonantly absorb the excitation laser beams flows, and a pair of second flow paths (42, 42) which are formed so as to extend along the first direction and sandwich the first flow path therebetween along a second direction intersecting the first direction and through which a second gas (V2) containing molecules that do not resonantly absorb the excitation laser beams flows, and an opening (14) which is provided to penetrate the flow path element along the second direction so as to extend from one of the second flow paths through the first flow path to the other second flow path when viewed from a third direction intersecting the first direction and the second direction.

The invention relates to the technical field of energy science and catalytic science, in particular to palladium-gold nanostars and a preparation method and application thereof. The palladium-gold nano-star comprises a gold nano-star and palladium nano-arrays which are orderly arranged on the surface of the gold nano-star; and the gold nanostars and the palladium nanoarrays jointly form a snowflake-like structure. According to the snowflake-like palladium-gold nanostar structure constructed by the invention, the palladium nanoarrays are highly and orderly arranged on the surface of the gold nanostar, so that optimized integration of a plasma antenna (gold nanostar) and a catalytic reactor (palladium nanoarrays) is realized. The unique structure has relatively strong surface plasmon resonance absorption capability, a self-constructed hot spot effect and a large specific surface area. The palladium-gold nanostars prepared by the method have excellent hydrogen production rate in photocatalytic formic acid dehydrogenation hydrogen production reaction.

A resonant sound absorber according to the present invention is attached to an attachment surface in an inner cavity of a tire. The resonant sound absorber comprises: a resonance box that has an opening and has a hollow part formed on the interior thereof; and a hollow neck part that is inserted into the opening and affixed to the resonance box, and extends into the hollow part.

The application provides a sound absorption structure and device. The sound absorption structure comprises: a body having a sound wave incidence surface; a plurality of partitions, at least part of the partitions being arranged in the body in a first direction parallel to the sound wave incidence surface, and at least part of the partitions being arranged in the body in a second direction parallel to the sound wave incidence surface, the first direction intersecting the second direction; and a plurality of partitions and the body enclosing a plurality of resonance cavities, the resonance cavities being configured to absorb sound waves by resonance; wherein at least one of the resonance cavities is bendable; and when bent, the length of the at least one resonance cavity in the first direction and / or the second direction changes. The above sound absorption structure can better adapt to different curved surfaces by configuring the bendable resonance cavities, thereby saving a large amount of installation space and greatly widening the application scenarios and application range of the sound absorption structure.

The utility model relates to a laminated vibration absorption and isolation trench structure, which comprises a soil retaining and vibration isolation structure and an additional laminated vibration absorption structure, the soil retaining and vibration isolation structure comprises a vertical plate, a toe plate and a heel plate, and the additional laminated vibration absorption structure is positioned on the upper part of the heel plate and on the outer side of the vertical plate and comprises a flexible cushion layer, a rigid restraint layer and an earthing mass body. According to the laminated vibration absorption and isolation trench structure, on one hand, vibration energy of a target controlled body input from the outside is isolated through the soil retaining and vibration isolation structure, and static stability of the vibration isolation trench is guaranteed, and on the other hand, vibration energy of a part of frequency bands in environmental vibration is absorbed through resonance of the additional laminated structure. Energy of the specific frequency band is blocked from being transmitted to the target control body, and the vibration reduction effect of the concerned frequency band is improved.

The application discloses a gold nanorod enhanced photothermal elastic gas detection system and a detection method, which are used for improving the universality of the gas detection system. The system comprises an adjustable laser, a gas cell and a quartz tuning fork. The light receiving area of the quartz tuning fork is arranged at the corresponding position of the modulated laser output by the adjustable laser. The light receiving area is provided with a photoelectric conversion film coating. The photoelectric conversion film coating comprises gold nanorod material deposited on the surface of the quartz tuning fork. The longitudinal localized surface plasmon resonance absorption peak of the gold nanorod material is matched with the absorption wavelength band of the to-be-detected gas. When the modulated laser emitted by the gas cell irradiates the photoelectric conversion film coating, the gold nanorod material enhances the absorption of the modulated laser through the localized surface plasmon resonance effect and converts the modulated laser into heat energy. The heat energy generated by the photoelectric conversion film coating is transmitted to the quartz tuning fork, so that the quartz tuning fork generates thermal elastic deformation and excites the quartz tuning fork to vibrate and output a gas concentration electric signal.

The utility model provides a wave absorber which is formed by arranging at least one wave absorbing unit in an array mode, each wave absorbing unit comprises a resonance absorbing layer, a first substrate layer, a middle dielectric layer, a second substrate layer and a plane absorbing layer which are sequentially stacked, each resonance absorbing layer comprises resonance patterns, each resonance pattern comprises a square ring pattern and a square block pattern, and the square ring pattern and the square block pattern are arranged in a staggered mode. The square block patterns are arranged in the square ring pattern in an array mode, and the square block patterns are connected into a whole through one or more corners of the square block patterns. Through the above implementation mode, the resonance pattern comprises the plurality of mutually connected square block patterns arranged in the square ring pattern, and the plurality of square block patterns are connected into a whole through one corner or a plurality of corners, so that the area of a single square block pattern is not influenced, and the square block patterns are utilized to absorb electromagnetic waves to the maximum extent; and the plurality of square patterns are mutually connected together, so that a relatively good resonance effect can be achieved, and the absorption effect of the resonance pattern is further improved.