52results about How to "Low external environment requirements" patented technology

The invention relates to a device for measuring parallelism of sight axis and reception axis of a laser range finder based on liquid crystal modulation, which belongs to the technical field of optical precision measurement. The device comprises an off-axis parabolic mirror, a liquid crystal spatial light modulator, an integrating sphere, a visible light source, an optical fiber A, a laser delay module, an optical fiber B and a coupler, wherein the liquid crystal spatial light modulator is disposed on the focal plane of the off-axis parabolic mirror; the liquid crystal spatial light modulator, the integrating sphere, the optical fiber A, the laser delay module, the optical fiber B and the coupler are sequentially disposed behind the focal plane, and the coupler is connected with a laser emitter; and the visible light source is connected with the integrating sphere. The detection device uses the liquid crystal to perform electro-optical modulation to generate surface target for optoelectronic scanning. The invention can be used for rapid detection of the parallelism of sight axis and reception axis of the laser range finder in both indoor and outdoor environments; and has the advantages of high measurement success ratio, high precision and portability.

The invention provides an amplitude phase calibrating device for semi-closed loop coupled phased array channels. Each channel of an active phased array plane is coupled to one waveguide coupler, thereby forming a coupling loop. Two ends of the coupling loop are connected with a signal receiving and transmitting module and a load. When a channel of the active phased array plane transmits an amplitude phase, a transmission system of the active phased array plane transmits a signal, and the signal receiving and transmitting module of the coupling loop receives the signal. When the channel of the active phased array plane receives the amplitude phase, the signal receiving and transmitting module of the coupling loop transmits a signal, and a system of the active phased array plane receives the signal. The transmitted or received amplitude phase information is fed back to a beam control dispatcher of an array phased array radar for amplitude phase calibration. The device not only can be used for the amplitude phase calibration of a phased array before assembly, also can be used for channel detection and amplitude phase calibration after assembly, enables the waveform design of the phased array to be more accurate, and enables the performance of the array phased array radar to be better.

The invention relates to a preparation method of a highly dispersed silicon dioxide microsphere with a controllable particle size. The preparation method comprises the following steps: (1) evenly mixing ethyl ortho-silicate and anhydrous ethanol; (2) dissolving inorganic salts into a mixed solution of ammonia water, anhydrous ethanol, and deionized water, wherein silicon dioxide microspheres with different particle sizes can be obtained according to the species and addition amounts of inorganic salts; and (3) stirring the solution obtained in the step (2) at a high speed, adding the solution obtained in the step (1) into the solution obtained in the step (2), reducing the stirring speed after the solutions are evenly mixed; two hours after reactions, carrying out centrifugal separation, and drying to obtain the silicon dioxide microsphere. The adopted equipment is simple, the operation is convenient, the repeatability is high, and the requirements on external environment are low. The particle size of the microsphere can be precisely controlled, during the preparation process of highly dispersed silicon dioxide microsphere. The reaction time is not changed. The prepared silicon dioxide microsphere has good dispersibility without grafting modification.

A method for preparing 2D grating of polymer / liquid crystal includes mixing light sensitive monomer with liquid crystal then injecting them in liquid crystal cell with two glass base plates, setting said cell according to designed angle at plate of two ¿C beam laser interference to carry out primary exposure to mixture in cell, rotating cell to be required angle to carry out secondary exposure for obtaining cross and periodic polymer layer surface on two directions to form tunable 2D grating of polymer / liquid crystal , hiving tuning ability on 2D direction by prepared grating under electric field action.

The invention discloses a digital Mohr phase shifting interference surface shape measurement method based on a region location fitting algorithm. The method comprises the following steps: establishinga virtual interferometer, acquiring an ideal system residual wavefront on an image surface of the virtual interferometer, and pre-marking a solving error region; acquiring a single-breadth actual interferogram in an actual interferometer; solving a surface shape error by using a digital Mohr phase shifting interference method to obtain the surface shape error with the solving error region; selecting data in a solving correctness region for fitting of the surface shape error to obtain a fitting coefficient; and reconstructing the surface shape error by the fitting coefficient to finally obtaina surface shape error result without the solving error region. The digital Mohr phase shifting interference surface shape measurement method solves the problem of a solving error occurring at a largeresidual aberration wavefront caused by the adoption of the digital Mohr phase shifting interference method; the measurement dynamic range of the digital Mohr phase shifting method is extended to beequivalent to that of a traditional phase shifting method; and meanwhile, the real-time, anti-shock and high-precision advantages of the original digital Mohr phase shifting interference method are maintained.

The present invention provides a wave energy power generation device and a power generation method. The wave energy power generation device comprises a floating body, a power generation box, power generation array polar plates and an electric energy collecting element; the power generation array pore plates are arranged in the power generation box; the power generation array polar plates comprisea plurality of copper plates and copper columns which are arranged in parallel at intervals; the outer wall of the power generation box is provided with the floating body; the copper plates partiallyimmersed in sea water and the copper columns always immersed in sea water form an array; the power generation box floats on the sea surface through the floating body; and when the power generation boxswings with waves, the areas, wetted by seawater, of the copper plates used as electrodes changes, and thus double electrode layer charge and discharge current is generated and transmitted to an electric energy storage element for storage and output. According to the technical scheme, the problems that in conventional wave energy power generation technologies, moving parts need to be used, low-grade wave energy cannot be collected, and the development cost is high are solved.

The invention discloses a method for measuring particle size and gradation of mixed sand based on an auto-correlation algorithm. The method comprises three steps: measuring the mean particle size of multiple groups of the sand, creating a calibration chart, and obtaining the particle size and the gradation of the mixed sand. An image of uniform sand is photographed through a digital camera, a correlation curve is drawn through the auto-correlation algorithm, the mean particle size is calculated according to the rise of the correlation curve, and a calibration chart of the mixed sand is created; a correlation representative curve of the mixed sand is created through the auto-correlation algorithm and added to the calibration chart, an area rate of various parts of the uniform sand is solved by nonlinear programming, the area rate is conversed to a mass rate so as to obtain the gradation, the mean particle size is obtained after calculating, and a mass cumulative curve and a mass distribution curve are drawn to obtain the median particle size. By using the method for measuring the particle size and the gradation of the mixed sand based on the auto-correlation algorithm, field and on-site real-time measurements are realized, and accuracy measurement on the particle size and the gradation of the mixed sand is realized through universal available equipment.

The invention provides a system for preparing a colloidal crystal and a method for preparing the colloidal crystal and belongs to the field of preparation methods of colloidal crystals. The system comprises a microsphere injection system, an infrared wavelength heat source, a metal frame, a sample groove, a metal platform, a threaded shaft, a metal movement module, a polyfluortetraethylene plate and a drive motor, wherein the drive motor is arranged at the left end of the metal frame, the threaded shaft is connected to the drive motor, the metal movement module is sleeved on the threaded shaft, the metal movement module is connected to the metal platform, the sample groove is formed in the metal platform, the polyfluortetraethylene plate is fixed to the upper end of the metal frame and is in contact with the sample groove, the drive motor rotates to drive the threaded shaft so as to drive the metal movement module to move right. The invention also provides a method of preparing the colloidal crystal; by virtue of the method, single-particle-size and multi-particle-size colloidal crystal templates can be assembled within a relatively short time range, and the obtained colloidal crystal has controllable thickness and is ordered in a large area.

The invention discloses a dismounting and mounting machine for a prefabricated box culvert mould core. The dismounting and mounting machine is composed of hydraulic cylinders, a hydraulic station, a multi-way valve, an upper vehicle frame, upper vehicle tracks, upper vehicle wheels, upper vehicle wheel driving motors, a lower vehicle frame, lower vehicle tracks, lower vehicle wheels and lower vehicle wheel driving motors, wherein the four hydraulic cylinders are provided and are fixedly arranged at two sides of the upper vehicle frame; the multi-way valve and the hydraulic station are arranged on the upper vehicle frame; the multi-way valve is connected between the hydraulic station and the hydraulic cylinders through an oil transmission pipeline; the upper vehicle frame, the upper vehicle tracks, the upper vehicle wheels and the upper vehicle wheel driving motors form an upper sliding mechanism; the lower vehicle frame, the lower vehicle tracks, the lower vehicle wheels and the lower vehicle wheel driving motors form a lower siding mechanism; and the upper sliding mechanism is parallel to the lower sliding mechanism, and the connecting way of the upper sliding mechanism is similar to that of the lower sliding mechanism. The dismounting and mounting machine for the prefabricated box culvert mould core can be used for self-loading and self-unloading a box culvert mould core, loading and unloading by using a crane are not needed, and transporting by a fork lift truck is not needed, so that the loading and unloading expenses are greatly reduced; and when the mould core is removed, the dismounting and mounting machine is high in precision, good in stability, free of deflection and flexible in operation.

The invention discloses a portable microfluidic chip imaging system. The imaging system ensures the consistency of the heights, the angles and the light conditions of all times of shooting when a reaction result in a microfluidic chip is acquired through a mobile phone and is low in requirement on the external environment, capable of greatly improving the accuracy of a read result, good in repeatability, satisfactory in effect, convenient to carry and very suitable for microfluidic chip imaging. The imaging system is small and exquisite in size and convenient to carry and cannot directly makecontact with a reaction region in the microfluidic chip, the condition that the interior of the imaging system is contaminated by chemical reagents cannot be caused, the cleaning problem is solved, the potential safety hazards are reduced, and the equipment does not generate obvious vibration like a scanner during imaging, so that the imaging system has the higher imaging quality.

The invention discloses an optical interferometer used for detecting the inner arc surface of an annular guide rail. The inner arc surface is located on the inner side or the outer side in the circumferential direction of the annular guide rail, a condensation convex lens of the inner arc surface is located between a laser and a collimation convex lens, and the focus of the condensation convex lens and the focus of the collimation convex lens coincide; a beam splitter located between the condensation convex lens and the collimation convex lens is used for dividing light of an auto-collimation convex lens into a first light beam and a second light beam; a reference lens is located on one side, back to the beam splitter, of the collimation convex lens, the surface, facing the collimation convex lens, of the reference lens is a convex surface, and the surface, back to the convex surface, of the reference lens is a standard spherical surface; a conical reflector is located in the annular guide rail to be detected, and a rotary shaft of the conical reflector, the axis of the annular guide rail and the axis of the reference lens coincide. According to the optical interferometer, feature information of the inner arc surface in the whole stereoscopic annular guide rail can be obtained at a time, and test efficiency, accuracy and reliability are also greatly improved.

The invention discloses a yaw control method for a wind driven generator. At least two yaw driving devices driving yaw of the wind driven generator are arranged. The number of the started yaw driving devices is controlled according to the air speed of a wind field; the number of the started yaw driving devices is controlled to be increased while the air speed of the wind field is increased; and the number of the started yaw driving devices is controlled to be decreased while the air speed of the wind field is decreased. The invention further discloses a yaw hydraulic control system of the wind driven generator. The yaw control method and the aw hydraulic control system of the wind driven generator are achieved on the basis of the yaw driving force needed by loads. Thus, the wind field adaptability is high, real-time wind alignment can be achieved, yaw errors are small, maintainability is good, manufacturing cost is low, and the requirement for an external environment is low.

The invention discloses a non-self-balancing steel truss large-span arch bridge rotation body, which comprises a base platform, a lower grinding disc is arranged on the surface of the base platform, the surface of the lower grinding disc is set as a conical surface, and a central pillar is arranged in the middle, and the surface of the conical surface is The isolation layer and the lubricating layer are coated in sequence. There is also a slideway on the base platform around the lower grinding table. There are a number of buttresses on the slideway. There is also an upper rotary table on the lower grinding table. The bottom is provided with a groove with the same shape as the lower grinding disc and the central pillar. The bottom of the upper turntable is also connected to the top of the pier. There is an overhead space between the bottom of the upper turntable and the base platform. The construction method is: Step 1) Preparation The base platform and the lower grinding disc; step 2) grinding the lower grinding disc; step 3) preparing the pier reinforcement; step 4) preparing the upper turntable. The invention has a relatively simple structure and is completely formed by pouring concrete, has low cost and is easy to popularize.

The invention provides a circulating gas supply system for a marshalling operation train in a vacuum environment and the train, the system comprises a pressure sensing unit, a control unit, a normal gas supply assembly, a first emergency gas supply assembly and a second emergency gas supply assembly, the normal gas supply assembly is connected with a first compartment, the first emergency gas supply assembly is selectively connected with the first compartment, the second emergency gas supply assembly is selectively connected with the first compartment or a second compartment, and when the pressure change rate is within a set safety threshold value, the normal gas supply assembly is used for supplying gas to the first compartment; and when the pressure change rate exceeds the set safety threshold value, the first emergency gas supply assembly is used for supplying gas to the first compartment or the first emergency gas supply assembly of the first compartment and the second emergency gas supply assembly of the second compartment are used for supplying gas to the first compartment. By means of the technical scheme, the technical problem that in the prior art, air cannot be circularly supplied to the train in the vacuum environment is solved.

The invention provides a window-based counting method and device based on multi-category incremental learning, which makes full use of the characteristics of regular target shapes, establishes a direct relationship between pixels and numbers, reduces cumulative errors, and realizes fast counting, while allowing objects Sticking, ignoring non-uniform density and mass factors. In order to avoid the limitation of the shooting angle when collecting images, there will be errors in the pixels of each area of ​​the target image, the detection range is divided into partitions by windows, and each window is counted separately to reduce the error. The device uses a dark box to avoid the interference of external light sources, and has very low requirements on the external environment; the multi-window template partitions the counting area to avoid the rolling of target objects and the adhesion between adjacent windows. The invention realizes high-accuracy fast counting of regular objects with light weight, small volume and uneven density similar to industrial sealing felt pads.

A device for measuring the bending angle of a bending piece is composed of a rotating platform (100), a drive device (400) mechanically connected with the rotating platform (100) to drive the rotating platform (100) to rotate, an angle measuring device (200) for measuring the angle of rotation of the rotating platform (100), a distance measuring device (300) fixed on the rotating platform (100) to measure the distance between the distance measuring device (300) and the first bending part (30a) of the bending piece, and a control device (500) electrically connected with the angle measuring device (200), the distance measuring device (300) and the drive device (400). According to the distance between the distance measuring device (300) and the first bending part (30a), the control device (500) can control the drive device (400) to drive the rotating platform (100) to rotate in the bending direction of the first bending part (30a), until the distance between the rotating platform and the first bending part (30a) measured by the distance measuring device (300) is minimal, then the bending angle of the bending piece can be calculated based on the angle of rotation measured by the angle measuring device (200) at this point. A method for measuring the bending angle of a bending piece is also disclosed. The device and method has the advantages of simple structure, accurate measurement and lower demand for the external environment.