58results about How to "Insensitive to temperature changes" patented technology

Reactive sensors typically exhibit nonlinear response to the combination of an excitational signal (e.g., sinusoidally oscillating signal) and a physical parameter under measure (e.g., position of magnetic core member). Such sensors are typically sensitive to temperature variation. Systems and methods are disclosed for compensating for the nonlinear and / or temperature dependant behavior of reactive sensors and for calibrating the post-compensation output signals relative to known samples of the physical parameter under measure (e.g., position). One class of embodiments comprises a housing containing at least part of a reactive sensor, a monolithic integrated circuit and a timing reference (e.g., an oscillator crystal). The integrated circuit includes a waveform generator for generating a sensor exciting signal, a detector for detecting the response of the sensor to the combination of the exciting signal and the under-measure physical parameter, a temperature compensating unit and a Pade' Approximant based, nonlinearity compensating unit. The temperature compensating unit and the Pade' Approximant nonlinearity compensating unit are tuned by use of digitally programmed coefficients. The coefficients calibrate the final output as well as compensating for nonlinearity and temperature sensitivity. A highly accurate measurement of the under-measure physical parameter is made possible even though each of the sensor and compensating circuitry may be relatively simple, compact, and low in cost.

The invention relates to the technical field of radar, in particular to a millimeter-wave quasi-optical integrated dielectric lens antenna and an array thereof. The array consists of a microstrip integrated antenna, a dielectric lens, an objective lens, an array base, a reflecting mirror, a protective cover and a beam transfer switch; one end face of the dielectric lens is a hemisphere or an ellipsoid, while the other end face is a cylindrical section; the microstrip integrated antenna is generated by an dielectric substrate, the front surface of the dielectric substrate is closely adhered tothe cylindrical section of the dielectric lens and serves as a feed source, and the back surface is grounded; the hemispherical or ellipsoidal end face of the dielectric lens is an antenna radiating surface; the length of the cylindrical part of the dielectric lens can be changed; the antenna array is arranged into a linear array or an area array; the array base and the reflecting mirror have conical quasi-optical reflecting mirror surfaces; the focus of the objective lens of the linear array or the area array aligns with the central line of the dielectric lens; the protective cover is arranged outside; and the antenna array is controlled by the beam transfer switch. The antenna structure has strong shock resistance and dust prevention, and is suitable for millimeter-wave radars for planes, automobiles and ships, and receiving / emitting sensing of communication equipment.

The invention relates to the technical field of radar, in particular to a millimeter-wave quasi-optical integrated dielectric lens antenna and an array thereof. The array consists of a microstrip integrated antenna, a dielectric lens, an objective lens, an array base, a reflecting mirror, a protective cover and a beam transfer switch; one end face of the dielectric lens is a hemisphere or an ellipsoid, while the other end face is a cylindrical section; the microstrip integrated antenna is generated by an dielectric substrate, the front surface of the dielectric substrate is closely adhered tothe cylindrical section of the dielectric lens and serves as a feed source, and the back surface is grounded; the hemispherical or ellipsoidal end face of the dielectric lens is an antenna radiating surface; the length of the cylindrical part of the dielectric lens can be changed; the antenna array is arranged into a linear array or an area array; the array base and the reflecting mirror have conical quasi-optical reflecting mirror surfaces; the focus of the objective lens of the linear array or the area array aligns with the central line of the dielectric lens; the protective cover is arranged outside; and the antenna array is controlled by the beam transfer switch. The antenna structure has strong shock resistance and dust prevention, and is suitable for millimeter-wave radars for planes, automobiles and ships, and receiving / emitting sensing of communication equipment.

A tunable micro-lens and micro-lens array for use in optical communications are disclosed. The micro-lens uses thermo optical material and a temperature controller to adjust the temperature and, hence, the index of refraction of the thermo optical material. In one embodiment, a single temperature controller is used to maintain an array of micro-lenses at a desired temperature. In an alternate embodiment, the individual lenses in an array are separately tunable. The invention may be used with either 2D or 3D lenses, and is well suited for use with existing planar lightwave circuit (PLC) technology.

Reactive sensors typically exhibit nonlinear response to temperature variation. Systems and methods are disclosed for compensating for the nonlinear and / or temperature dependent behavior of reactive sensors and for calibrating the post-compensation output signals relative to known samples of the physical parameter under measure. One call of embodiments includes a housing containing at least part of a reactive sensor, a monolithic integrated circuit and a timing reference. The integrated circuit includes a waveform generator for generating a sensor exciting signal, a detector for detecting the response of the sensor to the combination of the exciting signal and the under-measure physical parameter, a temperature compensating unit and the Pade Approximant nonlinearity compensating unit are tuned by use of digitally programmed coefficients. The coefficients calibrate the final output as well as compensating for nonlinearity and temperature sensitivity.

A tunable micro-lens and micro-lens array for use in optical communications are disclosed. The micro-lens uses thermo optical material and a temperature controller to adjust the temperature and, hence, the index of refraction of the thermo optical material. In one embodiment, a single temperature controller is used to maintain an array of micro-lenses at a desired temperature. In an alternate embodiment, the individual lenses in an array are separately tunable. The invention may be used with either 2D or 3D lenses, and is well suited for use with existing planar lightwave circuit (PLC) technology.

The invention relates to a SiGe bipolar complementary metal oxide semiconductor (BiCMOS) radio-frequency power amplifier. The amplifier comprises a first-stage pre-amplification transistor, a second-stage power amplification transistor, a first-stage biasing circuit, a second-stage biasing circuit, an input matching network and an impedance conversion network. The circuit structure of the invention consists of a first-stage pre-amplification circuit and a second-stage power amplification circuit which are connected with each other through a coupling capacitor. The first-stage pre-amplification transistor is a standard SiGe transistor, and the linearity of the circuit is enhanced by a remote control (RC) serial feedback circuit; and the second-stage power amplification transistor is a high-voltage SiGe transistor and can reach relatively high output power. Both the first biasing circuit and the second biasing circuit have bipolar transistor current mirror structures, and temperature stability is enhanced by temperature negative feedback technology. The amplifier has high linearity and relatively high output power.

The invention relates to an extra-large fiber reinforced plastic (FRP) combined storage tank structure with a floating roof, and a construction method of the storage tank structure. The extra-large FRP combined storage tank structure comprises a tank top, a tank wall and a tank bottom, wherein the tank top has an FRP latticed shell structure; FRP plates are laid on the FRP latticed shell structure; the tank wall is composed of an inner layer FRP plate, an outer layer FRP plate and active powder concrete between the inner layer FRP plate and the outer layer FRP plate; the floating roof is arranged in the tank cover; a connection piece is arranged between the inner layer FRP plate and the outer layer FRP plate; concrete trapezoid grooves are sequentially formed between the inner layer FRP plate and the outer layer FRP plate along a circumferential direction; prestress bars are pulled between every two adjacent concrete trapezoid grooves section by section; and the inner layer FRP plate and the outer layer FRP plate are formed by connecting FRP spliced plates through tenon tongues and tenon grooves. The extra-large FRP combined storage tank structure is high in corrosion resistance and freezing resistance, insensitive to temperature change, low in heat transmission speed, favorable for keeping temperature in a tank body, high in compression strength, high in corrosion resistance and relatively high anti-permeability.

The invention relates to a Breguet overcoil balance spring (1) that includes a hairspring (3) mounted in a single part, made of micro-machinable material, and coaxially with a collet (5). According to the invention, the balance spring has a terminal curve (7) made of micro-machinable material and an elevation device (9) made of micro-machinable material between the outer coil (15) of the hairspring and the terminal curve to improve the concentric development of the balance spring. The invention also relates to the method of manufacturing the balance spring. The invention concerns the field of timepiece making.

The invention provides a Faraday rotation reflection mirror and an optical fiber interferometer. The Faraday rotation reflection mirror comprises a collimator, wherein a Faraday rotator is arranged at the emergence end of the collimator, and a reflection mirror is arranged at the emergence end of the Faraday rotator. A polarizing beam-splitting beam-combining device are arranged between the emergence end of the collimator and the Faraday rotator, the Faraday rotator is located on an emergence optical path of the polarizing beam-splitting beam-combining device, light beams pass through the Faraday rotator and then rotate for 90 degrees in a polarization state, and a focusing lens is arranged between the emergence end of the Faraday rotator and the reflection mirror. The optical fiber interferometer is provided with two interference arms, wherein each interference arm is provided with the Faraday rotation reflection mirror. The Faraday rotation reflection mirror is suitable for the optical fiber interferometer which is large in wavelength range, insensitive to temperature change and high in signal to noise ratio.

The invention relates to a Breguet overcoil balance spring (1) that includes a hairspring (3) mounted in a single part, made of micro-machinable material, and coaxially with a collet (5). According to the invention, the balance spring has a terminal curve (7) made of micro-machinable material and an elevation device (9) made of micro-machinable material between the outer coil (15) of the hairspring and the terminal curve to improve the concentric development of the balance spring. The invention also relates to the method of manufacturing the balance spring. The invention concerns the field of timepiece making.

A method for controlling one or more temperature dependent optical properties of a structure in accordance with embodiments of the present invention includes heating at least a portion of a photonic band-gap structure and oxidizing the portion of the photonic band-gap structure during the heating to alter at least one temperature dependent optical property of the stack.

The invention relates to rare-earth modified asphalt and a preparation method thereof. The rare-earth compound modified asphalt is prepared from, by weight, 80-95 parts of matrix asphalt, 0.1-3 parts of rare-earth compounds and 4.9-20 parts of rock asphalt. The rare-earth compound modified asphalt has the advantages of being insensitive to temperature changes, free of cracks at low temperature and long in service life, resisting to tracks at high temperature, resisting to ageing, resisting to stripping and the like, the production process is simple, energy consumption is low, and cost is low. The modified asphalt has wide application prospects in building of roads and bridges.

The invention relates to a high-efficiency LD (Laser Diode) pumping frequency-doubling laser with wide temperature bandwidth. The high-efficiency LED pumping frequency-doubling laser comprises an LD pumping source, a coupling system and a laser resonant cavity; the laser resonant cavity comprises an input cavity lens, a laser crystal with wider absorption bandwidth, a frequency-doubling crystal with wider temperature receiving bandwidth, and an output cavity lens. Through the technical scheme above, the output of frequency-doubling laser, containing red light, green light or blue light, with a wide temperature band can be respectively realized by plating a specified film system on the laser resonant cavity lens and cutting the frequency-doubling crystal according to a relative phase matching angle.

The invention discloses a non-ferrous metal surface treatment agent and a preparation method thereof. The non-ferrous metal surface treatment agent is characterized in that all components of raw materials are composed of, by weight, 15-20 parts of sodium polyacrylate, 18-22 parts of trifluoroethanol, 3-4 parts of nonyl phenol polyoxyethylene ether, 1-2 parts of sodium dodecyl sulfate, 2-4 parts of sodium citrate, 2-4 parts of EDTA tetrasodium salt, 5-7 parts of chitosan, 4-6 parts of a rust remover, 3-5 parts of a corrosion inhibitor, 3-5 parts of an alkaline cleaner and 2-3 parts of silicon dioxide. The non-ferrous metal surface treatment agent is high in detergency power, good in cleaning effect, free of phosphorus and organic solvent and capable of preventing metal from oxidation and corrosion and keeping the surface of the metal bright, residual liquor generated after cleaning is free of pollution to the ecological environment, a layer of compact protective film can be formed on the surface of the metal, the surface tension and the interfacial tension are lowered, metal ions can be fixed, sensitivity to temperature variation is low, and stability is good; the situation that the mechanical performance of the metal is lowered is avoided, and the strength of steel can be maintained; and the influence on the environment is small, and treatment is more convenient.

This invention provides a radiation dosimeter and new method of operation which comprise two types of the metal-oxide-semiconductor field-effect transistor (MOSFET) circuits allowing to amplify the threshold voltage changes due to radiation and provide temperature compensation. The first type dosimeter is a radiation integrated circuit (RADIC) which includes two radiation field-effect transistors (RADFET) and two MOSFETs, integrated into the same substrate. The second type of radiation circuit includes two RADFETs, integrated into the same substrate, and two resistors. The amplification of the threshold voltage change is achieved by using amplification principles of an MOSFET inverter. In both cases, under the ionizing irradiation, the gate of first RADFET is forward biased and the gate of second RADFET is biased off. In the reading mode the amplified differential threshold voltage change is measured. The increased radiation sensitivity allows to measure of the milli-rad doses. The temperature effect and drift is substantially eliminated. These radiation integrated circuits can be used as a personal dosimeter in the nuclear, industrial and medical fields.

The invention discloses an excitation power circuit of a rotary transformer, belongs to the field of drive power sources, and solves the problems of complex circuit and incapability of independently working in the traditional excitation power of the rotary transformer. The excitation power circuit consists of a sinusoidal oscillation circuit, an amplitude adjusting circuit and a power amplifying circuit, wherein the sinusoidal oscillation circuit consists of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor CSEL1, a capacitor CSEL2, a first operational amplifier and a second operational amplifier; the amplitude adjusting circuit consists of a resistor R6, a resistor R7, a resistor RSEL, a capacitor C3 and a third operational amplifier; and the power amplifying circuit comprises a resistor R8 and a power amplifier. The frequency of a sinusoidal excitation power source generated by the circuit of the invention is modulated by selecting a capacitance value of the capacitor CSEL1 and the capacitor CSEL2, and the amplitude value of the sinusoidal excitation power source is adjusted by changing the resistance value of the resistor RSEL. The excitation power circuit of the invention serves as the drive power source of the rotary transformer.

The invention provides a content detection method of gamithromycin. According to the technical scheme, the content of gamithromycin is detected by virtue of a HPLC method; an evaporative light-scattering detector is utilized, is high in sensitivity and is not sensitive to temperature variation, and a base line is relatively stable; the response of the evaporative light-scattering detector does not depend on the optical property of a sample, is not influenced by functional groups, is not interfered by a mobile phase and is in direct proportion to the quality of the sample, and specific chemical structures of detected main components are not required; the gamithromycin is relatively low in absorption wavelength and is absorbed at a tail end of an ultraviolet ray; therefore, compared with an ultraviolet detector, the evaporative light-scattering detector has great superiority in the detection of gamithromycin. Besides, selected chromatographic columns and chromatographic conditions are designed tightly around the characteristic of the evaporative light-scattering detector, a relatively good separation effect is integrally realized; after the method is verified by virtue of methods such as an accuracy experiment, a linear relation experiment and a sampling recycling experiment, results show that the accuracy is high, the detection range is wide, and the sensitivity is relatively good.

The invention discloses a light airplane aileron manipulating system. The light airplane aileron manipulating system comprises a left manipulating handle device, a right manipulating handle device, aleft aileron torsion bar, a right aileron torsion bar, an aileron synchronous rod, two same push-pull flexible shafts, two same space four-connecting-rod mechanisms, a left aileron and a right aileron, the two same push-pull flexible shafts are symmetrically arranged, and the two same space four-connecting-rod mechanisms are symmetrically arranged. A small connecting rod in the left manipulating handle device is connected with the left aileron torsion bar, the other end of the left aileron torsion bar is connected with the aileron synchronous rod, and flexible shaft connectors in the aileron synchronous rod are connected with the push-pull flexible shafts. The other ends of the push-pull flexible shafts are connected with the space four-connecting-rod mechanisms, deflection of the left aileron and the right aileron can be driven through the space four-connecting-rod mechanisms, and any one in the left manipulating handle device and the right manipulating handle device can control simultaneous reverse movement of the left aileron and the right aileron. According to the light airplane aileron manipulating system, the deflection angles of the ailerons are ensured at high accuracy.

The invention provides an optical imaging system for visible light waveband, medium-wave infrared waveband and long-wave infrared waveband. The optical imaging system mainly solves the problem that an existing multi-spectrum camera is heavy in structure and complicated in optical system. The optical imaging system for visible light waveband, medium-wave infrared waveband and long-wave infrared waveband comprises a first reflection mirror, a second reflection mirror and a third reflection mirror, wherein the first reflection mirror is used for reflecting the visible light waveband, the medium-wave infrared waveband and the long-wave infrared waveband, the second reflection mirror is used for reflecting the visible light waveband and the medium-wave infrared waveband and transmitting the long-wave infrared waveband, and the third reflection mirror is used for transmitting the visible light waveband and the medium-wave infrared waveband and reflecting the long-wave infrared waveband. The optical imaging system for the visible light waveband, the medium-wave infrared waveband and the long-wave infrared waveband is light in structure, few in optical devices, fine in imaging quality, small and high in engineering realizability and is integrated with multi-spectrum detection.

The invention relates to a SiGe bipolar complementary metal oxide semiconductor (BiCMOS) radio-frequency power amplifier. The amplifier comprises a first-stage pre-amplification transistor, a second-stage power amplification transistor, a first-stage biasing circuit, a second-stage biasing circuit, an input matching network and an impedance conversion network. The circuit structure of the invention consists of a first-stage pre-amplification circuit and a second-stage power amplification circuit which are connected with each other through a coupling capacitor. The first-stage pre-amplification transistor is a standard SiGe transistor, and the linearity of the circuit is enhanced by a remote control (RC) serial feedback circuit; and the second-stage power amplification transistor is a high-voltage SiGe transistor and can reach relatively high output power. Both the first biasing circuit and the second biasing circuit have bipolar transistor current mirror structures, and temperature stability is enhanced by temperature negative feedback technology. The amplifier has high linearity and relatively high output power.

The invention discloses a dynamically adjustable and controllable multimode interference coupler. The coupler comprises a coupler body. The coupler body comprises a supporting substrate, a coupler base body arranged on the supporting substrate, a plurality of input waveguides and a plurality of output waveguides, the input waveguides and the output waveguides are arranged on the coupler base body.And the coupler further comprises a dynamic regulation and control element used for regulating and controlling a refractive index of the coupler base body. Based on a MMI coupler, compared with an MZI array structure, the coupler has advantages that the coupler is simple in structure, and only one optical element (MMI) can achieve computing power which can be achieved by an array composed of dozens of MZIs; the coupler is insensitive to a temperature change and can be applied to occasions with the large temperature change; a bandwidth is wide, a design is more flexible, and applicability is stronger; and the coupler is insensitive to machining errors so that machining is simpler.

The invention relates to a three-screw pump machine barrel and a ceramic treatment method of an inner surface of the three-screw pump machine barrel, and belongs to the technical field of material surface modification. The three-screw pump machine barrel can be used for solving the problems that the existing three-screw pump rubber bushing has high temperature sensitivity, is easy to age and has aeolotropy. The three-screw pump machine barrel is characterized in that a ceramic membrane is plated on the inner wall of the three-screw pump machine barrel, the ceramic membrane is more than 800HV in hardness and more than 50mu m in thickness, and the ceramic membrane has the characteristics of high precision, high abrasion resistance, no sensitivity to temperature change and difficulty in chemical reaction with acid-base media. The ceramic treatment method of the inner surface of the three-screw pump machine barrel comprises the following steps: firstly electrifying the pump machine barrel filled with an alkaline working solution by use of a pulsed power supply, so as to generate a Al2O3 film on the inner wall of the pump machine barrel by virtue of the electrochemical reaction, and scanning the surface of the generated film by use of a laser so as to enable the surface of the film to be flattened. The method is suitable for ceramic treatment of the surface of the pump machine barrel.

The invention discloses a method for preparing a non-ferrous metal surface treating agent and belongs to the field of metal surface treatment. The method comprises the preparation steps: (a) weighing and mixing sodium polyacrylate, sodium pyrophosphate, carboxymethyl cellulose and sodium dodecyl sulfonate, adding deionized water, uniformly stirring, heating to the temperature of 45 DEG C while stirring, and carrying out heat preservation for 30 minutes, so as to obtain a solution; (b) cooling the solution obtained in the step (a) to the temperature of 25 DEG C, adding chitosan and alumina, and stirring for 20 minutes, so as to obtain a solution; (c) adding acetic acid and triethanolamine into the solution obtained in the step (b), and uniformly stirring, thereby obtaining the non-ferrous metal surface treating agent. Through treating the surface of metal by using the non-ferrous metal surface treating agent, the metal can be effectively prevented from oxidation and corrosion, and the surface of the metal can be kept bright; the non-ferrous metal surface treating agent is pollution-free to environment, is degradable, is low in cost and safe in use, and is beneficial to very good popularization.

The invention discloses a flexural type inhaul cable particle damper which comprises a damper lower portion support frame, a flexible type particle container, filler particles and a connection system. The upper steel plate of the damper lower portion support frame is in screw joint with one end of the flexible type particle container, the other end of the flexible type particle container is connected with the connection rod of the connection system, and the connection rod is connected with a rope sling through a bolt. The flexural type inhaul cable particle damper has the advantages that the flexibility of the container is used, the vibration action of the inhaul cable are transmitted to the particle container through the transmitting-down function of the connection rod, the bending vibration of the container is aroused, the particles are further driven to move, energy is consumed by the mutual collision and friction among the particles and the particles and the container, a using environment is not influenced by the changing of temperature, manufacturing cost is low, and suitable bandwidth is wide.

The invention discloses a preparation method of modified asphalt with good comprehensive performance. The modified asphalt is prepared from the following raw materials in parts by weight: 100 parts ofmatrix asphalt, 4 to 6 parts of compound modifying agent, 1.0 to 1.5 parts of compatilizer, 0.2 to 3 parts of surfactant and 1 to 2 parts of chemical auxiliary agent. The modified asphalt provided bythe invention has a specific proportion so that the problem of storage stability of SBS (Styrene-Butadiene-Styrene) modified asphalt is solved very well, the high-temperature stability of an asphaltpavement can be remarkably improved and the low-temperature anti-cracking performance of the asphalt pavement is improved; the modified asphalt has the advantage that the modified asphalt is not sensitive to temperature change; indexes including the needle penetration, softening point, ductility and the like of the modified asphalt are comprehensively improved and the service life of the asphalt pavement is prolonged.

The invention discloses a common-mode inductor applying a high-stability ultra-crystalline magnetic core and a manufacturing method of the common-mode inductor. The ultra-crystalline magnetic core with high stability is obtained through controlling vacuum electro-slag remelting, single-roll chilling, molding, ultra-crystallization and distressing processing of the ultra-crystalline magnetic core; and the stability of the common-mode inductor disclosed by the invention is improved through a gap filler which is formed by mixing an aluminum nitride based ceramic framework with excellent electromagnetic performance, a fully enclosed aluminum alloy shielding case and silicone rubber with glass fibers according to a weight ratio of 9: 1. The common-mode inductor applying the high-stability ultra-crystalline magnetic core is high in stability, insensitive to temperature, long in service life, good in electromagnetic shielding performance and excellent in heat dissipation performance.

The invention discloses a small-area reference circuit in the Internet of Things. The reference circuit comprises a staring circuit, a power supply independent biasing circuit and a core reference circuit, wherein the starting circuit is used for completing the starting of the reference circuit and avoiding an undesired zero current state; the power supply independent biasing circuit is used for generating current reference with a positive temperature coefficient; the core reference circuit is inclinedly arranged in the subthreshold area and generates core reference current and reference voltage, and the accuracy of the generated reference voltage is higher. According to the small-area reference circuit, all MOS tubes adopt strengthening-type MOS tubes, the strengthening-type MOS tubes arenot sensitive to temperature changes, energy consumption is lower, and as a result of the subthreshold state of MOSFET, high tolerance to power and technology changes is achieved.

The invention relates to an air film cooling platelet injector. The air film cooling platelet injector comprises an injector body, wherein a fuel flow channel which communicates with a fuel supply source and an oxidant flow channel which communicates with an oxidant supply source are formed in the injector body; the fuel flow channel comprises a fuel inlet channel, a radial fuel shunting chamber and a plurality of fuel shunting channels which communicate with each other in sequence, and the plurality of fuel shunting channels are circumferentially distributed along the central axis of the fuelshunting chamber; and the oxidant flow channel comprises an oxidant inlet channel, an oxidant turning cavity, a radial oxidant shunting chamber and a plurality of oxidant shunting channels which communicate with each other in sequence, the central axis of the fuel shunting chamber coincides with that of the oxidant shunting chamber, and the plurality of oxidant shunting channels are circumferentially distributed along the central axis of the oxidant shunting chamber. According to the air film cooling platelet injector, a combustion chamber body and an injector panel are cooled by adopting anair film cooling method, so that the service life of the injector and an engine can be prolonged.

The invention provides an athermalized super lens, and belongs to the technical field of optics. The athermalized super lens comprises a substrate and nano structures periodically arranged on at least one side of the substrate, wherein the refractive index temperature coefficient of the nanostructure is smaller than a reference refractive index temperature coefficient; or the nanostructure is composed of at least two materials, and the product of refractive index temperature coefficients of the at least two materials is smaller than zero. According to the athermalized superlens, the refractive index temperature coefficient of the nanostructure is smaller than the reference refractive index temperature coefficient, or the nanostructure is composed of at least two materials with the product of the refractive index temperature coefficients smaller than zero, so that the effective refractive index of the nanostructure is insensitive to temperature changes, and the problem that the imaging performance of the superlens is reduced due to temperature drift is solved.