42results about How to "Reduce adjustment requirements" patented technology

The invention discloses a two-axis photoelectric collimator based rotary table division error detection method. The two-axis photoelectric collimator based rotary table division error detection method includes the steps: (1) mounting a multi-tooth division table at the center of the working face of an inspected rotary table, fixing a planar mirror onto the multi-tooth division table and using an autocollimator for collimating the planar mirror; (2) enabling the inspected rotary table to rotate for a circle so that both two axes of the photoelectric autocollimator have numerical reading; (3) placing the inspected rotary table at the zero position, reading initial values of the two-axis photoelectric autocollimator, then rotating the multi-tooth division table by an angle phi, and enabling the planar mirror to rotate by the angle phi along with the inspected rotary table; (4) enabling the planar mirror to rotate by the angle phi towards the opposite direction along with the multi-tooth division table, enabling the photoelectric autocollimator to collimate the planar mirror again and read measurement values until a circle is completed; and (5) changing an inclination angle of the multi-tooth division table relative to the rotary table while keeping the two-axis photoelectric autocollimator immovable, repeating the step 2, the step 3 and the step 4 for secondary detection, and reading measurement values of the two-axis photoelectric autocollimator. By the aid of the method, the requirement on adjustment is lowered.

The invention discloses a toroidal concave reflector laser cavity resonator which comprises a reflector, a laser medium and an output mirror and the toroidal concave reflector laser cavity resonator is characterized in that: the reflector is toroidal and concave and comprises one or more homocentric and toroidal arc concave faces. The invention can make the center of the reflecting surface into around surface or the center of the reflector surface into a non reflecting surface or an air core. The invention can also adopt a toroidal concave output mirror. The laser cavity resonator of the invention has simple processing, convenient adjustment, stable working, large available mode volume, very small divergence angle and good beam quality, thus being applicable to middle, high power gas lasers or solid lasers and especially being applicable to gain medium of large volume and toroidal and columnar gain medium.

The invention relates to a positioning mechanism of a tool fixture, in particular to a gas dustproof damping-free retractable elastic positioning mechanism, and belongs to the technical field of positioning. The gas dustproof damping-free retractable elastic positioning mechanism comprises a positioning pin base. The positioning pin base is internally provided with a through hole. The through hole is internally connected with a positioning pin in a sliding mode. The bottom of the positioning pin base is provided with a spring base. The lower end of a spring is located in the spring base, and the upper end of the spring makes contact with the positioning pin. The gas dustproof damping-free retractable elastic positioning mechanism is reliable in structure, good in protective property and convenient to maintain. In the normal state, gas between a pin body and the pin base is blown out of an opening of the pin base, and the gas dustproof function is achieved. A gas film is generated between the pin body and the pin base, no mechanical damping motion exists, and the flexibility of movement of the elastic positioning pin is improved. The service life of the spring is prolonged because no damping exists, and the adjusting requirement for the spring force of the elastic positioning pin is low.

The invention discloses a control method of a supplementary-fired building heat exchange unit, comprising a plate heat exchanger, a gas-fired water heater, and the primary side return water and the secondary side return water of the plate heat exchanger are connected by pipes, each plate type The heat exchanger is correspondingly installed with a gas water heater, which is installed on the secondary side water supply pipe of the plate heat exchanger, and the gas water heater is connected to the gas pipeline. It also includes a control system, including a weather forecasting module, a data acquisition module, a control module, a display module, and a communication module. The control method includes establishing a heating system operation module, a gas supplementary combustion module, an analysis module, and an adjustment module for the transformed heat exchange unit; prejudging the establishment of a heating system operation module for the heat exchange unit through the analysis module, The judgment result enters the adjustment module in advance, and the heating system runs stably through the gas supplementary combustion module. The invention significantly reduces the dependence of the building heat exchange unit on the hydraulic balance, and realizes the precise delivery of thermal energy through multi-energy complementation.

The present invention relates to a method for preparing a test sample using FIB and a test sample, the method comprising: providing a pretreated sample with a target layer having opposite first and second surfaces; The pretreated sample is fixed on the sample stage; along the direction towards the first surface and / or the second surface of the target layer, the ion beam is used to perform the first thinning of the pretreated sample, and the thickness of the pretreated sample is reduced. Thinning to a preset thickness; forming several through holes through the pretreated sample; continuing to perform a second thinning on the pretreated sample formed with the through holes until the target layer is thinned to a target thickness. The above method can avoid deformation of the target layer during the thinning process.

The invention discloses a large, thick, high-strength and high-toughness TMCP type steel plate and a production method thereof. The large, thick, high-strength and high-toughness TMCP type steel plate is composed of, by weight, 0.06%-0.08% of C, 0.20%-0.40% of Si, 1.40%-1.50% of Mn, 0.015% or less of P, 0.005% or less of S, 0.020-0.030% of Nb, 0.030%-0.050% of Alt, the balance Fe and inevitable impurities and 0.20% or less of Pcm. According to the steel plate, the components are simple, only a proper amount of microalloy Nb is added, and the precious elements such as V, Ti and Ni are not added; production cost is low, and the probability of large-scale production is increased. The steel plate is of a mixed structure mainly containing bainite, ferrite, pearlite and martensite and has a good comprehensive mechanical property; the steel plate is better in matching of the components and the strength and toughness, and it is guaranteed that the steel plate has the excellent comprehensive mechanical property; particularly, the impact performance of half of the plate in the thickness direction is good at the low temperature of minus 40 DEG C, and the method can be widely used for producing low-temperature-resistant building steel and engineering steel used in extremely cold climate. The method has the advantages that the production cost is low, and the technique is simple; the performance of products is excellent, and the comprehensive mechanical property of the products is stable.

The disclosed total-reflection laser cavity comprises a total-reflection mirror composed by a right-angle rotary table medial surface and a coaxial right-angle conical lateral surface both as high reflecting surfaces, an output mirror, and the laser active medium. Wherein, there is a size relation PHIb=2PHIa with PHIa as the diameter of contact circle between the lateral and medial surfaces, and PHIb as the bottom diameter of the total-reflector. This invention has well performance and wide application.

The invention relates to a structure notch filter designing method which is used for structure notch filters for large flight envelope range flight or multi-task flight airplanes or changing along with the flight state. Design is conducted under the condition that the requirement for the sufficient pneumatic servo elastic stability margin of an airplane is guaranteed, the method includes the steps that an airplane envelope is divided, pneumatic elasticity analysis without the structure notch filter is conducted on the airplane envelope, frequency points and damping coefficients which are preliminarily obtained are adjusted according to an adjustment principle, and finally a transmission function of the structure notch filter is obtained. By the adoption of the structure notch filter designing method, the adaptability of structure notch filter design is improved, the pneumatic servo elastic stability margin is improved, the requirement for adjusting flight control law technical parameters is lowered, and the flight performance is improved.

The invention discloses a slow light waveguide structure based on a photonic crystal air bridge structure, which adopts a line defect photonic crystal structure, and comprises a longitudinal structure and a horizontal structure, wherein, the longitudinal structure is an air bridge multi-layer structure which comprises an air layer, a semiconductor material layer, an air layer and a substrate material layer from the top layer to the bottom layer; the horizontal structure adopts a triangular lattice structure, the period is P, and the radius is R; and the waveguide is formed through removing a row of holes. Through changing the size of the line defect nearby hole, the slow light waveguide structure of the invention realizes a slow light working area reaching up to 50 nanometers; the centralwavelength can be adjusted through the width of the waveguide, which can be realized only in need of the small holes with two types of apertures within the requirement range of hundreds of nanometersof operating wavelengths, thus lowering the requirement of device parameter adjustment in a certain technological condition. By utilizing the slow light photonic crystal waveguide of the slow opticalwaveguide structure based on the photonic crystal air bridge structure, the bandwidth can cover the C wave band of the fiber-optical communication, and can achieve 50nm.

The invention consists of a totally reflecting mirror, an output mirror and a laser working medium. The totally reflecting mirror consists of medial surface of first right angle truncated cone and the lateral surface of the reverse right angle taper cone. The first right angle truncated cone and the right angle taper cone have coaxial symmetry axis of rotation , their medial surface and lateral surface all are highly reflective surface. The output mirror is composed of round plane beam splitter and totally reflecting mirror in concentric ring shape, and they have coaxial symmetry axis of rotation. The totally reflecting mirror in concentric ring shape is composed of the medial surface of the second right angle truncated cone and the lateral surface of third right angle truncated cone, and both right angle truncated cone have coaxial symmetry axis of rotation, and their medial surface and lateral surface all are highly reflective surfaces.

Disclosed are a device for increasing high-energy petawatt laser focusing power density and a method. The device comprises a reflector group, a deformable lens, a beam expanding system, a compressor, a large-aperture off-axis parabolic lens, a wedge-shaped lens, a wavefront sensor, a high-resolution scientific CCD (charge coupled device), a computer and a deformable lens high-voltage power controller. The wavefront detector is placed at the rear of the focus of the large-aperture off-axis parabolic lens, the small-aperture deformable lens which is a correcting component is placed in a small-aperture optical path in front of the compressor, and the wavefront detector and the small-aperture deformable lens form an adaptive optical closed correcting loop which is used for measuring and correcting, with wavefront of a spherical surface behind the focus as a benchmark. The small-aperture deformable lens can effectively correct all wavefront distortions including wavefront distortions caused by an optical compressing element and an optical focusing element, the size of a focusing spot is close to diffraction limit as far as possible, and the laser focusing power density is greatly increased. The device has the advantages that the device is economical and high-efficient, is simple in adjustment and stable in operation, and the like.