50 results about "Axial mode" patented technology

A printed quasi-tapered tape helical element and printed helical array antenna arc disclosed. The helical element comprises a thin helix conductor having a uniform section associated with a tapered section. The helix conductor can be printed on a thin dielectric sheet and bonded to a hollow composite dielectric support. A solid copper conductor is configured to provide electrical connection between a feeding point of the helix conductor and a microstrip line of a microstrip feed network. The uniform and tapered helix turns are respectively wrapped around the uniform and tapered sections, which enables impedance matching, axial mode excitation, gain and radiation patterns, and damping out of standing waves generated in current distribution over the helix conductor. Conductive composite cups surrounding each helical element reduces mutual coupling in array environment. Thus, the helical element and the array antenna achieve low on-axis and off-axis axial ratio performance over the wideband for global coverage.

In an endoscope system including: a light emission unit emits laser light as illumination light or excitation light; a light guide unit guides the illumination light or the excitation light to an object; and an image pickup unit picks up a normal image formed with reflection light generated by reflection of the illumination light from the object or a fluorescence image emitted from the object in response to the excitation light. The laser light is multiaxial-mode laser light, or the light emission unit includes a plurality of laser-light sources which emit single-axial-mode laser beams having different wavelengths or phases. Alternatively, a vibration unit which vibrates the light guide unit is provided, or a high-frequency signal is superimposed on a driving current of the light emission unit, so that the wavelength of the laser light is shifted among a plurality of values.

The invention discloses an axial-mode cylindrical helical antenna. The axial-mode cylindrical helical antenna comprises a helical radiator, a medium supporter, a feed matcher, a grounding board and a radio-frequency (RF) coaxial connector, wherein the helical radiator is of a cylindrical shape which is formed in a manner that a copper pipe is sequentially and helically encircled rightwards, and a variable-lift-angle helical structure is formed in a manner that the helical radiator extends to the circumference of a cylindrical bottom face from the circle center of the bottom face along the radial direction and then extends along the axial direction in a rising manner; the medium supporter is fixedly arranged on the grounding board; the feed matcher is of an inverted-L-shaped microstrip structure and divided into a horizontal part and a vertical part; the starting end of the helical radiator is arranged on the horizontal part which is stuck to the upper surface of the medium supporter and supported by the medium supporter; the RF coaxial connector is vertically arranged on the grounding board, and the top end of an inner conductor of the RF coaxial connector is connected with the vertical part; and an outer conductor of the RF coaxial connector is connected with the grounding board. The axial-mode cylindrical helical antenna has the advantages of flexible design, simple physical structure, excellent antenna performance and wide application.

A diode pumped, multi axial mode, intracavity doubled, intracavity tripled laser, includes at least two resonator mirrors defining a resonator cavity. A laser crystal and a doubling crystal are positioned in the resonator cavity. A tripling crystal is also positioned in the resonator cavity. A diode pump source supplies a pump beam to the laser crystal and produces a laser crystal beam with a plurality of axial modes that are incident on the doubling crystal. This produces a frequency doubled output beam. Further, a diode pumped, multi axial mode, intracavity nonlinearly-converted laser is provided and includes at least two resonator mirrors defining a resonator cavity, a laser crystal and a nonlinear conversion apparatus positioned in the resonator cavity. A nonlinear conversion apparatus is also positioned in the resonator cavity. A diode pump source supplying a pump beam to the laser crystal and produces a laser crystal beam with a plurality of axial modes that are incident on the nonlinear conversion apparatus. The result is a nonlinearly converted output beam that has a % RMS noise of less than 3%.

A method and apparatus are provided for detecting a frequency of an optical signal within a communications channel having a plurality of optical carriers separated by a predetermined frequency spacing. The method includes the steps of locking an optical carrier frequency to an axial mode of an optical resonator of known free spectral range; providing an additional optical resonator as a reference having a known free spectral range that differs from that of the first optical resonator; locking an optical reference signal to a closest axial mode of a reference optical resonator producing an optical reference signal that is spectrally offset from said optical carrier frequency by a spectral quantity less than the known free spectral range; mixing the optical carrier frequency with the reference optical signal frequency thus generating a difference signal as a beat frequency; and measuring a frequency of a difference signal.

A CO₂ laser reference oscillator (RO) can provide injection seeding to a Q-switched (QS) or Q-switched cavity dumped (QSCD) CO₂ laser, where the output frequency of the RO laser is locked to the peak of the laser line by the use of appropriate electronics to dither one of the resonator mirrors of the reference oscillator. This injected radiation seeds the radiation building up within the Q-switched laser cavity, such that the oscillating frequency favors the wavelength of the injected radiation. An electronic feedback control circuit can be used to lock an axial mode of the Q-switched laser to line center. The change in build-up time of the pulses within the QS laser can be used to maintain cavity length at a value that enables oscillating at the peak of the same laser line that is injected into QS laser.

The invention discloses a method for quickly estimating underwater target shell radial vibration low-frequency sound radiation signals based on mode decomposition, and belongs to the technical field of underwater target sound radiation. The method includes the following steps that firstly, based on uncertainty of a researched object, the range of researched frequency bands is determined; secondly, based on a mode decomposition theory and different model structures, a simulation sound pressure equation is determined; thirdly, based on a mode truncation theory, an appropriate lower order axial mode order is calculated by adopting a higher circumferential mode order; fourthly, an appropriate lower order circumferential mode order is calculated by adopting a higher axial mode order; eventually the radiation signals through simulating calculation are acquired through calculation, and then the underwater target sound radiation condition is analyzed. According to the technical scheme, the underwater target sound radiation signals generated by radial vibration are accurately simulated through the few mode orders, and therefore calculation complexity is low and accuracy is high.

Novel reconfigurable antennas are provided which may be used to accommodate the requirements for wideband multi-standard handheld communication devices. It is shown that using a shape memory alloy spring actuator, the height of a helical antenna and therefore the pitch spacing and angle can be varied. This can in turn tune the far-field radiation pattern and gain of the antenna dynamically to adjust to new operating conditions. The radiation pattern can further be directed using a two-helix array. Finally, a helical antenna embodiment is implemented and measured using a shape memory alloy actuator. Measurement results confirm that while keeping the centre frequency constant, gain tunability can be attained using this structure.

The invention relates to a test method of SiC crystal phonon anisotropy based on polarized Raman spectroscopy, wherein the test method includes the following steps: (1) processing SiC crystals respectively, to obtain a-face, c-face and m-face samples, and polishing; (2) adding a semi-wave sheet in an incident light path of a Raman spectrometer, and adding a polarizing sheet in a back scattering light path; (3) fixing the direction of the polarizing sheet, rotating the semi-wave sheet to change the relative direction of the incident polarized light to the scattering polarized light, and testinga polarized Raman spectrum; (4) fitting peaks of different phonon modes, to obtain the Raman intensities of a plane mode E1, a plane mode E2 and an axial mode A1; (5) carrying out normalization treatment law of the Raman peak intensities of the plane mode E1, the plane mode E2 and the axial mode A1; and (6) obtaining anisotropy of different anisotropic phonon modes. By optimizing the test parameters, the anisotropy of the phonons in different polarity faces of the SiC crystals is effectively characterized.

The invention provides a multi-angle adjusting and clamping device for welding of a special-shaped pipe fitting. The multi-angle adjusting and clamping device comprises a bracket, a square rail and afixed gear, a set of sliding supporting seat is slidably connected with the upper end face of the bracket, a set of fixed chucks is connected with the right end face of the bracket in an axial mode, aset of middle gears is connected with the right end face of the bracket in an axial mode, a set of middle gears is connected with the left end face of each sliding supporting seat in an axial mode, aset of center rotating shafts is connected with the upper part of each sliding supporting seat in an axial mode, a set of adjusting pulling seats is slidably connected with each center rotating shaft, and a set of adjusting nuts is connected with the left end face of each adjusting pulling seat in an axial mode. Movable chucks and the fixed chucks are arranged to rotate synchronously, the fact that the welding seam cannot change is ensured, and the welding quality is improved; and by adapting rotating of the pipe fitting, welding is achieved through a overall non-rotating manner, blocking dueto the clamping device is avoided, secondary welding is avoided, one-time welding molding is achieved, and the welding quality is improved.

The invention discloses a cylinder stroke amplification mechanism which aims at solving the problem that the cylinder stroke is difficult to be increased in the prior art. The cylinder stroke amplification mechanism comprises a frame and a cylinder which are fixed together; the cylinder stroke amplification mechanism also comprises a gear, a fixed rack and a movable rack; the fixed rack is fixed on the frame; the movable rack can move in a linear axial mode; an original lever of the cylinder is in rotating connection and vertical intersection with a center shaft of the gear; the upper edge and the lower edge of the gear, which are opposite to each other, are meshed with the fixed rack and the movable rack respectively; a material pushing rod which is used for outputting the motion outward is fixedly connected onto the movable rack; the fixed rack and the movable rack are provided with automatic lubrication devices. According to the cylinder stroke amplification mechanism, the gear is driven by the original lever of the cylinder to move, the gear rotates under the constraints of the fixed rack, and the movable rack is driven to move, and the push work of workpieces is executed by the material pushing rod.

The invention relates to an axial mode helical antenna, particularly to an axial mode helical antenna with a double-layer segmental medium lens. The axial mode helical antenna with the double-layer segmental medium lens aims at solving the problem that when the coil number of an existing helical antenna is large, the enhancement effect of the gain is obvious, and the manufacture of the antenna can be complex. The double-layer segmental medium lens is arranged above the upper end of the helical antenna, and the lower surface of the double-layer segmental medium lens is a downward-convex spherical surface. The distance between the vertex of the lower surface of the double-layer segmental medium lens and the upper end surface of the helical antenna is 12mm, the lower end of the helical antenna is connected with the terminals of micro-strip line metal straps on a micro-strip impedance transformer floor, the tops of the micro-strip line metal straps on the micro-strip impedance transformer floor are connected with an inner conductor of a coaxial feeder line, the central axis of the helical antenna is perpendicular to the upper surface of the micro-strip impedance transformer floor, and the micro-strip metal straps are arranged on the micro-strip impedance transformer floor in a question mark shape. The axial mode helical antenna with the double-layer segmental medium lens is applicable to the radio field.

The invention provides an N330 carbon black production method. The process is simple and practical, and produced carbon black is better in performance. A hard carbon black reaction furnace is used for production, and the volume ratio of air to natural gas entering the reaction furnace is (18-19):1, so that more redundant air is generated to take participation in secondary combustion in a reaction chamber; raw oil enters the reaction chamber according to the spray amount of 440 kg/h; each kilogram of raw oil needs 2-3 m<3> of mixed gas composed of air and natural gas; the temperature of secondary combustion in the reaction chamber is controlled to be 1500-1600 DEG C; a plurality of gas inlets are evenly formed in a spray burner in the radial direction, and natural gas enters the gas inlets in a radial surrounding and axial mode so as to improve combustion efficiency; a first quenching section and a second quenching section are arranged at an outlet of the reaction furnace, the temperature of the first quenching section is controlled to be 900-950 DEG C, the temperature of the second quenching section is controlled to be 700-950 DEG C, and accordingly reaction time is prolonged; after carbon black is subjected to wet granulation, mixed gas composed of tail gas generated after carbon black production and air is introduced to dry the carbon black at the temperature of 300 DEG C; the tail gas and the air are mixed according to the volume ratio of (1.5-1.6):1.

The invention discloses a connecting device suitable for a forging die for a large upsetting forging crankshaft and a using method thereof. The connecting device comprises a connector, wherein the connector is I-shaped, and the upper end of the connector is fixed on a sliding block of a press; a pair of shaft tables are arranged at the lower end of the connector, and shaft holes are formed in theshaft tables; connecting shafts penetrate through the shaft holes in a penetrating mode, and elastic check rings are arranged at the two ends of the connecting shafts; bosses with the position corresponding to the that of the connector is further arranged at the lower end of the connector; connecting pieces are also in an I-shaped shape and each comprise an upper cross arm and a lower cross arm, wherein through holes are formed in the upper cross arms, and the through holes are connected with the connecting shafts in an axial mode, and the lower parts of the upper cross arms are planes and arematched with the upper surfaces of the bosses; the upper parts of the lower cross arms are matched with the upper side surfaces of grooves arranged on the die; and pin holes are formed in the upper surface of the die and the lower surface of the connector correspondingly, and positioning keys are inserted into the pin holes. The connecting device and the using method thereof have the advantages that a traditional structure utilizing bolt conduction force can be changed into a large-scale rectangular cross section conduction structure with the connecting pieces, so that the connecting strengthis high, structure is simple, operation is convenient, and working stability and the safety of the die are high.