576 results about "Wave tube" patented technology

Determining the placement of an endotracheal tube in a patient. The invention evaluates discontinuities in the medium surrounding the endotracheal tube, such as the airway, as a function of distance past an end of the endotracheal tube. Using a loudspeaker to generate sound waves, the sound waves propagate through a coiled wavetube, a connecting adapter, and an endotracheal tube, into the area of interest. With a processing system, reflected sound waves which return from the cavity back to a microphone within the wavetube are analyzed and an area-distance curve of the area in interest is constructed.

The invention discloses a distribution terahertz oscillator, which relates to technique of THz (terahertz) electromagnetic wave sources and comprises an electron gun, an interaction region and a collector. The interaction region consists of a periodic slow wave structured modulation resonant cavity and an energy extraction cavity, and the modulation resonant cavity is in a periodic slow wave structure which can be operated in a backward wave mode or a forward wave mode to be interacted with electron beams in a distributive manner, so that the electron beams can be modulated in terms of speed and density. The distribution terahertz oscillator integrates advantages of a backward wave tube and a distribution klystron, and has the advantage of suitableness for generating THz electromagnetic waves.

A 2-m-maglitude free-piston-driven high-enthalpy shock tunnel comprises a high-pressure gas storage chamber, a piston launching mechanism, a piston, a compression tube, a piston stop mechanism, a maincapsule mechanism, a shock wave tube, a small capsule mechanism, a spray tube, a test segment, a track and a support system. The high-pressure gas storage chamber is arranged at the upstream of the piston launching mechanism and stores high-pressure air. After being launched through the piston launching mechanism, the piston may move to the downstream of the compression tube at increased speed; when the piston arrives at the tail end of the compression tube, most energy is transmitted to helium-argon mixed light gas, and high-temperature high-pressure gas is generated; at this moment, a membrane of the main capsule mechanism breaks, incoming shock wave is generated and passes through the shove wave tube until its tail end, the shoe wave may be reflected, and high-temperature high-pressuregas is generated to cause breakage of a membrane of the small capsule mechanism. The high-temperature high-pressure test gas passes through the spray pipe to the test segment, and free stream conditions required are acquired.

The invention discloses and especially relates to a secondary harmonic inhibition method for a broadband helix travelling wave tube, and belongs to the technical field of broadband helix travelling wave tubes. Within a certain range, a travelling wave tube harmonic inhibition situation becomes greater if a distance between a fin to a center is reduced, however, the reduced distance will make the fin closer to a helix and might cause engineering machining troubles and many other potential troubles. Therefore, two different fin structures are adopted by an input segment and an output segment respectively, and the distance from a fin on the input segment to the center is made to be greater. Through the even and symmetric fin structure, a better harmonic inhibition effect is exhibited, and other factors in terms of the design of a travelling wave tube can be better weighed.

A self contained breathing apparatus has a display of air pressure within the face mask in the field of vision of the user of the breathing apparatus. The display is four lights that indicate the four quarter-tanks of pressure, and the lights change to indicate the amount of air remaining. A transducer receives tank pressure and provides an electric signal. The air pressure is placed on a bourdon tube which rotates a disk in response to changes in pressure. One half of the disk includes a gradient, and a light source emits light through the gradient to be received by a light sensor. As the disk rotates, the gradient varies the amount of light received by the sensor, so the electrical output of the sensor varies.

This invention relates to one nuclear power stabilizer wave tube weld beam test and position device, which comprises double slide entrance hole supportive position rack on the flange surface, wherein, the position rack comprises entrance hole flange connection socket with double slide set and flexible cover tube in between with radio source tube and sensor cable; flexible cover tube bottom end and radio source position bolt socket are connected with three sensors along 120 degree direction on bolt socket; radio source position socket head and stabilizer are relative to the down supportive central hole; glue racket is fixed on the wave tube outsides stabilizer with radio glue dark case distributed on the glue racket.

The invention discloses a helical line traveling wave tube slow-wave component and a preparation method thereof. The method comprises the steps as follows: a cleaned medium holding rod and the helical line are arranged in a diamond deposition chamber; the diamond is deposited on the surface of the medium holding rod and the helical line to form a diamond film; the medium holding rod and the helical line with the diamond film and a metal pipe shell are fixed on a loading die and extruded into the metal pipe shell. The component comprises the medium holding rod, the helical line, a pipe shell, a first diamond film and a second diamond film. The diamond is deposited on the surfaces of medium holding rod and the helical line, therefore, the defect of low heat conductivity of other mediums is compensated, the heat dissipation capability of the slow-wave component is improved, and the problems of difficult processing and expensive price of the diamond holding rod are solved.

The invention discloses a deformation-free thermal extrusion method for helix slow-wave component preparation, which relates to the microwave device technology and is used for preparing a helix travelling wave tube component. The method comprises the following steps: placing and fixing a metal tube shell on an extrusion platform, feeding a helix and a medium clamping rod into an extrusion die, heating the tube shell firstly to increase the inside diameter of the tube shell, pushing the helix and the clamping rod of which positions are well fixed to the tube shell by using a push rod, then stopping heating, taking down the extrusion die, recovering the temperature of the whole component to the room temperature, and generating a great contraction force at the moment due to the contraction ofthe inside diameter of the tube shell to be applied to the helix and the clamping rod component to firmly extrude the both inside the tube shell so as to finish the preparation of the slow-wave component. Various dies required by the method can be prepared by machining of a linear cutting electro-discharge machine tool. The method not only can well improve the heat dissipation performance of theslow-wave component, but also can avoid the component structure deformation, dielectric performance reduction and high-frequency loss increment caused by the conventional assembly method.

The invention provides a rectangular-grooved loading winding waveguide slow wave line, relating to a travelling wave tube amplifying device in the technical field of microwave vacuum electronics. A series of arc (or right-angle) bend waveguides and straight waveguides are connected end to end to form a winding waveguide structure; each bend waveguide is inboard provided with an opening along the broadside direction of the waveguides; each opening position is connected with a rectangular groove; the whole winding waveguides and the chambers of the rectangular-grooves are mutually communicated; the central axis symmetric line of the winding waveguide structure, the straight waveguides walls and the rectangular-grooved walls are provided with circular through holes at the points of intersection thereof; then two through holes of all adjacent straight waveguide walls and rectangular-grooved walls are connected by metal tubes with the same aperture size as the aperture size of the circular through holes to form an electron bunch channel. In the invention, the rectangular grooves featuring periodic loading are used for improving field distribution in conventional winding waveguide slow wave line; the slow wave line of the invention, compared with ordinary slow wave line, has higher coupling impedance, higher power gain and output power and smaller volume.

The invention discloses a planar annular microstrip slow-wave structure which belongs to the field of microwave electric vacuum technology. The planar annular microstrip slow-wave structure relates to a traveling-wave tube amplifier device. The planar annular microstrip slow-wave structure comprises a dielectric substrate (2) and metal wires (1) on the surface of the dielectric substrate (2). The planar annular microstrip slow-wave structure is characterized in that each metal wire (1) has a periodical structure which is obtained through successively connecting a plurality of annular units with same shape and same dimension. Each annular unit is obtained through joining two open rings which are in mirror symmetry in a vertical direction. Two adjacent annular units are connected at a joining part between the two open rings through a microstrip line. Compared with an existing microstrip slow-wave structure, the planar annular microstrip is advantageous in that a vacuum device with the planar annular microstrip slow-wave structure can be used in a higher operating frequency band on condition of same dimension because of wider cold bandwidth. The planar annular microstrip slow-wave structure provided by the invention has a wide transverse dimension, thereby effectively reducing a requirement for an electronic gun and a focusing magnetic field. The planar annular microstrip slow-wave structure has a relatively high coupling impedance and can perform interaction with an electron beam in a relatively good manner. Therefore the planar annular microstrip slow-wave structure has relatively high potential and is suitable for miniature planar traveling-wave tubes.

The invention discloses a small all-metal slow wave device for a traveling wave tube or backward wave tube which works at a centimeter wave band or a millimeter wave band in the technical field of vacuum electronics. The small all-metal slow wave device comprises a cylindrical metallic wave conductor and annular sheet type metallic electric resonance pieces arranged inside the wave conductor at intervals, wherein the inner diameter of the cylindrical metallic wave conductor is not larger than one third of the free space wavelength of an electromagnetic wave working at a center frequency, an electron beam channel is formed in the middle of each annular sheet type metallic electric resonance piece, and two auricle-shaped through holes are symmetrically formed in the annular sheet body of each resonance piece. Due to the fact that the two auricle-shaped through holes generating electric resonance are symmetrically formed in the annular sheet body of each resonance piece, electromagnetism intercoupling is effectively eliminated, and only the electric resonance generated by electric dipoles exists. Taking a slow wave device working at the S waveband as an example, the cross section of the all-metal slow wave device is only 35%-50% that of a traditional coupled cavity traveling wave tube. Thus, the all-metal slow wave device has the advantages of being small in size, simple in structure, high in power capacity, output power and interaction efficiency, capable of being produced in an industrialized mode easily and the like.

The invention discloses an angular-clamping biradial electron beam angle logarithmic plane zigzag slow-wave line slow-wave structure, and relates to the field of radial beam traveling-wave tube systems. The structure comprises a metal cavity, an angle logarithmic metal plane zigzag slow-wave line, an upper ideal cathode, a lower ideal cathode, a first medium supporting rod, and a second medium supporting rod. The structure solves a problem of an ineffective angle logarithmic micro-strip slow-wave structure in a working process of a radial beam traveling-wave tube, which is caused by a condition that a defocused electron beam is liable to bombard a logarithmic micro-strip and causes the fusion of the logarithmic micro-strip.

This invention relates to pressure difference controlled self-adapting throttle expansion valve, which comprises pressure difference inductance structure and elastic elements in outer shell and elastic wave pattern tube, wherein the elastic element both ends are separately connected to the elastic wave pattern tube sealed end outside and outer shell inner top end and the elastic wave tube bottom is connected to the outer shell bottom end. The elastic wave pattern tube and the outer shell form chamber A. The flow adjusting structure comprises drive bar connected to the elastic wave tube sealed end inner top, valve needle and valve with one hole for the needle move. Its sealed upper end is connected to the drive down end.

The invention relates to a manufacturing process of a slow wave system for a helix travelling wave tube. The manufacturing process comprises steps that, (1), a helix and a clamping rod are put in a tube casing to form a slow wave before extrusion; (2), the slow wave before extrusion is put in an extrusion tool, the position corresponding to the clamping rod is aligned with a pressing head of the extrusion tool, pressing force is exerted through the extrusion tool to make the tube casing, the clamping rod and the helix to realize tight contact; (3), a white copper ring and a pure iron pole shoe are sleeved outside the tube casing, an AgCu welding material is filled, and the parts are sent to a hydrogen furnace; (4), the temperature curve of a hydrogen furnace is set as follows, the temperature increasing/decreasing speed is 15DEG C/min, the soldering temperature is 780 DEG C, the insulation time is 2 minutes, and the parts are taken out after soldering; and (5), whether the clamping rod and the helix of the slow wave system generate displacement and whether the welding material is fully melted are detected through a microscope. According to the manufacturing process, structure soundness and thermal diffusivity of the slow wave system are greatly improved through the hot compression effect, and bearable power of the whole tube can be improved correspondingly.

The invention belongs to the technical field of broadband helix traveling wave tubes, and provides an efficient broadband helix traveling wave tube with inner diameter hopping for the shortcoming of low output power of the existing broadband helix traveling wave tube. The efficient broadband helix traveling wave tube comprises an input helix, an output helix, a clamping rod, a tube casing and a centralized attenuator. The input helix and the output helix are fixed in the tube casing through the clamping rod. The input helix and the output helix are separated through cutting. Both sides are cut, and the centralized attenuator is arranged. The efficient broadband helix traveling wave tube is characterized in that the inner diameter of the output helix is hopping compared with the inner diameter of the input helix, so that the helix traveling wave tube realizes saturation output power point gathering in a work band. According to the broadband helix traveling wave tube provided by the invention, an inner diameter hopping technology is used to effectively solve the problem of saturation output power synchronization in bandwidth; the output power of the broadband helix traveling wave tube is effectively improved; and the output power is high under an equal excitation input condition.

The invention discloses a rectangular slow wave line used for a traveling wave tube. A rectangular ridge waveguide is used as a rectangular shielding cylinder; on the basis of the rectangular shielding cylinder, n, or n+1, or n-1 metal rectangular rings with square externals and circular internals and two metal flat plates are provided additionally; the centers of the metal rectangular rings are overlapped with the central axis of the rectangular ridge waveguide, and are periodically distributed in an axial direction; the internal circular parts of the metal rectangular rings form an electron beam channel of the traveling wave tube; and the metal rectangular rings and the outer shielding cylinder are connected together by the two metal flat plates which are arranged parallel to the wide edge of the rectangular shielding cylinder between the metal rectangular rings and narrow edge of the rectangular shielding cylinder. Therefore, the all-metal slow wave line is formed; the slow wave line is directly connected with the rectangular shielding cylinder, so that the thermal conductivity is greatly improved; the coupling impendence is higher; the power capacity is increased; a ridge loaded structure is adopted, so that a relatively wide bandwidth is realized; meanwhile, the rectangular slow wave line is simple to process, high in integrality, high in processing precision, simple to assemble and good in the radiating effect; and furthermore, the precision of the slow wave tube can be ensured easily.

The invention provides a satellite travelling-wave tube thermovacuum testing system which comprises a vacuum vessel, wherein the vacuum vessel is internally provided with a travelling-wave tube platform which is fixedly arranged on an elevating mechanism; the travelling-wave tube platform is of a hollow cavity structure; the cavity is internally provided with a heat exchange tube; the heat exchange tube is connected with a refrigerating unit through a coolant pipeline; and the refrigerating unit is positioned outside the vacuum vessel. According to the satellite travelling-wave tube thermovacuum testing system provided by the invention, a travelling-wave tube exchanges heat with the travelling-wave tube platform through a heat conduction mode, so that the heat exchange efficiency between the travelling-wave tube platform and a test piece is greatly improved, The travelling-wave tube cooling time is reduced, and one technical problem in a satellite travelling-wave tube thermovacuum testing process is solved.

The invention discloses a millimeter wave band traveling wave tube output window and a manufacturing method thereof, belonging to the field of microwave vacuum electron devices. The output window comprises a core bar-shaped inner conductor and cylindrical dielectric ceramic components arranged at the periphery and connected with each other by welding, wherein the components are then welded with outermost cylindrical outer conductors. The manufacturing method is as follows: utilizing electromagnetic simulation software to carry out stimulation experiment adjustment on the output window; selecting the inner conductor, the dielectric ceramics and the outer conductors; plating nickel on the inner conductor and the outer conductors; metalizing the alumina ceramics; assembling the inner conductor, the ceramics and the outer conductors on a corresponding welding jig and carrying out welding in a hydrogen furnace according to the corresponding process specification; detecting the vacuum air tightness of the output window; and testing the standing-wave ratio of the output window, wherein the requirement that the standing-wave ratio is less than 1.5 is satisfied in the working band. The structure of the output window has good vacuum air tightness, and the output window can bear direct current power transmission of 80W and can be widely used for the millimeter wave band low-frequency spiral traveling wave tubes.

The invention provides a strong sound agglomeration device and a strong sound agglomeration method for treating suspended particles. The strong sound agglomeration device comprises a strong sound source assembly, an agglomeration cabin assembly and a conventional dust removal assembly, wherein the agglomeration cabin assembly comprises a cylindrical head cabin, a cone transition cabin, a bidirectional modal standing wave tube for forming axial and radial standing wave fields and a cylindrical tail cabin, the cylindrical head cabin is connected to the strong sound source assembly and is provided with an opening for inputting gas to be treated, the major diameter end of the cone transition cabin is connected to the cylindrical head cabin, one end of the bidirectional modal standing wave tube is connected to the minor diameter end of the cone transition cabin, and the other end of the bidirectional modal standing wave tube is connected to the cylindrical tail cabin. The method comprises the following steps: step one, starting the strong sound source assembly, so that strong sound waves simultaneously form the axial and radial high strong sound standing wave fields in the bidirectional modal standing wave tube; step two, inputting the gas to be treated into the agglomeration cabin assembly, and aggregating the suspended particles into agglomerates with large particle sizes under the effects of the axial and radial high strong sound standing wave fields in the bidirectional modal standing wave tube; and step three, removing the agglomerates with large particle sizes in airflow by using the conventional dust removal assembly.

The invention discloses a slow wave structure used for an X-waveband space travelling wave tube. A tube shell adopts a Monel tube shell with the inner diameter of 1.9 millimeters, a holding rod is made of a wedge-shaped BeO99 material, the slow wave structure adopts a high-pure vacuum smelted molybdenum helix of 0.13mm*0.26mm, the helix at the output section of the slow wave structure has a plurality of sections with different thread pitches, and a two-section carbon film attenuator is selected for inhibiting self-oscillation. The slow wave system has the advantages of large coupling impedance, strong heat dissipation capability, high interactive efficiency and the like, and is suitable for the space travelling wave tube.

The invention relates to a serially connected electricity supply power supply for a multi-stage depressed collector traveling wave tube. The serially connected electricity supply power supply comprises a primary voltage converter, wherein the output end of the primary voltage converter is connected with a primary coil N0 of a multi-winding high-voltage transformer T1, N secondary coils of the multi-winding high-voltage transformer are respectively connected with the input ends of N rectification filter circuits, the output positive ends and the output negative ends of every two adjacent rectification filter circuits are connected, the output positive end of the first rectification filter circuit is connected with a tube body of the traveling wave tube, the output negative ends of the first to (N-1)th rectification filter circuits are connected with the (N-1) collectors of the traveling wave tube, the output negative end of the N-th rectification filter circuit is connected with the cathode of the traveling wave tube, and the output end of a voltage sampling circuit is connected with the feedback signal input end of the primary voltage converter. The serially connected electricity supply power supply has the advantages that secondary power supplies share one converter, the voltage output speed of each stage of power supply maintains consistency, the reliability is high, the secondary power supplies are connected in series and are superimposed, and the voltage withstanding value of an output filtering capacitor is reduced, so that the size of the whole power supply is greatly reduced, and the power density is high.

The invention belongs to an oval sheet beam electron gun, which is used with a travelling wave tube, a backward wave tube and the like. The oval sheet beam electron gun comprises a shell, an electric heating wire in the shell, a cathode component, a focusing electrode component and an anode, wherein an emitting surface of a cathode head of the cathode component is a plane, the focusing electrode component comprises a pyramidal focusing hole, and the anode is positioned at an output port of the shell and provided with an anode hole which is a cylindroid hole. The cathode head is made of lanthanum hexaboride, the emitting surface of the cathode head is modified into a plane, a pyramidal hole with a rectangular axial section is used as the focusing hole, and the cylindroid hole is used as the anode hole, so that the oval sheet beam electron gun has the advantages that the oval sheet beam electron gun is simple in structure and convenient in processing, the precision is easy to be guaranteed, devices are easy to be miniaturized, the production cost is low, current emitted by the cathode head is high in density, operation frequency of the devices and current density of electron beams can be improved effectively, the electron gun is high in output efficiency and long in service life, and the like. The defects of complex structure, low current density and unevenness of the electron beams, high evaporativity and short service life of the cathode in operation at high temperature, and the like in the prior art can be overcome.

The invention discloses a slow wave structure of a coplanar waveguide, wherein the slow wave structure of the coplanar waveguide belongs to the technical field of microwave electrovacuum and relates to a travelling wave tube amplifier device. The slow wave structure of the coplanar waveguide comprises a dielectric substrate (2) and a metal layer (1) on the surface of the dielectric substrate (2). The metal layer (1) comprises a central conduction band and grounded metal surfaces at two sides of the central conduction band. The shape of the central conduction band is a periodical bent curve. The central conduction band is isolated from the grounded metal surfaces at two sides. The slow wave structure of the coplanar waveguide can effectively settle a problem of electron accumulation on a microstrip slow wave structure, and serial connection or parallel connection with other microwave devices is easily realized, thereby easily realizing small size and integration of a vacuum device. The vacuum device with the structure of the invention has relatively low working voltage, and the coupling impedance curve and the dispersion curve are relatively flat, thereby realizing wide frequency band of the vacuum device and reducing gain fluctuation of the vacuum device in the working frequency band. Therefore the slow wave structure of the coplanar waveguide has relatively high potential and is suitable for a miniature planar travelling wave tube.