39results about How to "Clear design principles" patented technology

The invention provides a ground state single-transmission peak atom light filter and a method using the light filter for light filtering. The atom light filter comprises an alkali metal atomic bubble, two polarizing films, a magnetic field source and a temperature control system, wherein the alkali metal atomic bubble is filled with inert gas. When the atom light filter is used for the light filtering, polarizing directions of the two polarizing films can be firstly adjusted to be mutually vertical, and light selection can be carried out for incident lights; the temperature control system can be utilized for controlling the temperature of the alkali metal atomic bubble at 30 DEG C to 120 DEG C; and then light rotation can be carried out for the incident lights by utilizing a faraday anomalous dispersion effect of alkali metal atom in a uniform magnetic field, and a single-transmission peak light spectrum can be obtained. According to the invention, the faraday anomalous dispersion effect which is realized after the inert gas and alkali metal gas are mixed is utilized, the design principle is clear, the structure is simple, the working is stable, and the laser performance is high.

The invention discloses an all-optical switch based on a rubidium-atom optical filter and a method thereof. The all-optical switch based on the rubidium-atom optical filter comprises an alkali-metal rubidium-atom glass air chamber with a V-type energy level structure, two Glan-Taylor polarizers with the polarization directions perpendicular to each other and a stable magnetic field source used for generating a magnetic field with uniform intensity for the alkali-metal rubidium-atom glass air chamber, wherein the alkali-metal rubidium-atom glass air chamber, the two polarizers with the polarization directions perpendicular to each other and the stable magnetic field source form a standard atomic optical filter. The all-optical switch based on the rubidium-atom optical filter further comprises a 420 nm laser device serving as a control part of the all-optical switch of the atomic optical filter and a 780 nm laser device serving as a performance testing and application wavelength testing part of the all-optical switch of the rubidium-atom optical filter. The all-optical switch based on the rubidium-atom optical filter has the advantages of being clear in design principle, simple in structure, easy to manufacture, good in switching performance, stable in operation and long in service life.

The invention discloses a two-way axial-flow pump impeller based on an inclined V symmetrical wing type and a design method for the two-way axial-flow pump impeller, and belongs to the technical field of hydraulic engineering. The impeller comprises blades and a hub; wheel rim diameter of the impeller is 300 mm; a hub ratio is 0.4667; the four blades are uniformly distributed in the peripheral direction of the hub; wing types of the blades are inclined V symmetrical wing types; center lines of single-sided wing types of the blade wing types are in the shape of inclined V; maximum thickness of a hub side wing type is 12 mm; maximum thickness of a wheel rim side wing type is 6 mm; and section of a middle wing type is linearly changed according to the maximum thickness. A design method for the impeller comprises the following steps of: step A: designing a two-way axial-flow pump wing type; and step B: designing a two-way axial-flow pump impeller. The optimal point of cavitation performance of the two-way axial-flow pump adopting the inclined V symmetrical wing type design is close to a zero-head working condition point; and the optimal point of the cavitation performance of a common one-way pump is close to an efficient point. At the efficient point, the cavitation performance of the two-way pump adopting the inclined V wing type reaches the level of the one-way pump.

The invention discloses an integrated atom beam type optical frequency standard comprising an electrical cabinet and an optical cabinet. The electrical cabinet consisting of a control device, a measurement device, and a display device provides power for all devices of the optical cabinet and outputs a control signal and a frequency locking signal to the optical cabinet. The optical cabinet including an atomic beam tube, a laser device and an ultra-stable laser system outputs an ultra-stable resonant cavity signal and an atomic spectrum signal to the electrical cabinet; the atomic beam tube isan integrated calcium atom beam sealing tube; and the laser device includes a 423-nm laser device and a 657-nm laser device. On the basis of the optical frequency standard design, problems of many laser devices and complicated system of other optical frequency standard systems are solved; and the provided optical frequency standard is expected to be a first commercial time-keeping optical frequency standard capable of working continuously. The optical frequency standard based on the clear design principle has the high scientificity and engineering achievablility and a leading-edge novel designin the optical frequency standard field is provided.

The invention relates to a detection apparatus and method for the swing frequency error and swing zeroing error of a rotary table, belonging to the technical field of testing of inertial devices. According to the invention, magnetic steel is fixedly mounted on a detected rotation frame or side end face of the rotary table; a Hall sensor and a processing circuit are fixedly arranged on an immovable foundation; once the magnetic steel faces an induction surface of the Hall sensor, a TTL level induction signal is generated; a rotary-table calibrating device acquires TTL level induction signals and calculates the cycle length of adjacent TTL level induction signals so as to obtain the error of the swing frequency of the rotary table; a digital level meter is arranged on the reference surface of the detected frame of the rotary table; a photoelectric autocollimator collimates the center of a reflective mirror on the rotary table; and the digital level meter and the photoelectric autocollimator test the states of the rotary table before and after swing test and then data processing is carried out so as to obtain the swing zeroing error. The detection apparatus and method provided by the invention can detect the swing frequency errors and swing zeroing errors of rotary tables of different types, and has the characteristics of good applicability, high accuracy, convenience and rapidness.

The invention discloses a cable-force-adjustable anchor pull anti-slide pile. Prestress anchor cables are additionally arranged within the range of 1.5-4.5 m below the top of the anti-slide pile, anda cable force adjusting device is additionally arranged at the anchoring end of each anchor cable, wherein each cable force adjusting device comprises a cable adjusting device, a tensioning device anda connecting device for connecting the tensioning device with the cable adjusting device. The cable adjusting devices are used for controlling the magnitude of cable force and increasing or decreasing the cable force of anchor cables according to the project needs. The tensioning devices are used for providing or releasing tensioning force for tension compensation. According to the cable-force-adjustable anchor pull anti-slide pile, the cable force of the anchor pull pile can still be adjusted after project completion and operation, so that the prestress loss of the anti-slide pile is compensated.

The invention discloses an automatic design method for a novel axial flow pump impeller based on a Brewkovski airfoil profile, belongs to the technical field of hydraulic engineering equipment. Parameters of the blade grid density, the axial surface speed, the rotation component speed, the blade chord placing angle, the airfoil profile camber and thickness are determined; a design method of the system is formed through coordinate transformation and graphic display. The method is scientific, the design principle is clear, the model design of the axial flow pump becomes simpler and more convenient from theoretical analysis to model establishment and from program design to model output, the operation efficiency and precision of the axial flow pump are improved, theoretical guidance is provided for researchers in various fields, and technical support is also provided for axial flow pump manufacturers.

The invention provides a separate injection well separate injection technology boundary comprehensive judgment method. According to the separate injection well separate injection technology boundary comprehensive judgment method, a ground water injection system-water injection wellbore-water distribution nozzle-injection-production well chamber-oil well wellbore five-node integrated design methodis adopted, the 'interlayer flow difference' is taken as a characteristic variable, selective balanced water injection is taken as a design target, a water nozzle adjustment process boundary and an oil reservoir boundary are comprehensively considered, a comprehensive boundary chart is established, separate injection process selection is guided, a test and regulation process mode is optimized, thetest and regulation period can be effectively prolonged, the labor intensity of personnel is reduced, and the separate injection development effect is improved.

The invention discloses a first sliding and then hinged support and a connection method. Firstly, a lower structure is implemented and completed, an embedded part is reserved in the lower structure, the bottom of a sliding support is fixed on the lower structure through the embedded part, an upper structure is connected to the top of the sliding support, and after the upper structure is implemented and completed and horizontal force is released, and deformation becomes stable, a limiting device is added to limit movement of the sliding support, so that the limited sliding support only rotatesin an axial direction, thereby changing the sliding support to a hinged support. According to the support and the method, the requirement of mutual sliding of a connecting part under the complex stress condition in an implementation process is firstly met, and horizontal force and deformation of mutual action of the connecting part are released. During subsequent use, the stability of the structure can be enhanced by converting the sliding support into the hinged support, mutual sliding can be limited, so that the final structure can eliminate the rigid connection damage effect in the implementation process, can further enhance stability in a use process, and the method has the characteristics of simple implementation, clear principles, strong practicability and the like.