79 results about "Focal Spot Size" patented technology

A directly diode-pumped amplifier system is disclosed which produces sub-picosecond pulses with an output power of 2 watts or more. Computer resources are coupled to the amplifier system and are configured to provide control of operating parameters of the amplifier system. An optional second harmonic generator is supplied to increase the contrast ratio and reduce the minimum focal spot size. This amplifier system can be utilized for material processing applications.

A device and method for X-ray tube focal spot parameter control, wherein stray electrons are detected in an X-ray tube. The detected electrons lead to a signal having a characteristic pattern. The characteristic pattern may be evaluated, and based on the evaluation a controlling signal may be outputted so that a fast and exact controlling of the operating parameters of an X-ray tube may be carried out based on the detected stray electrons.

The invention discloses an in-situ heat treatment method for realizing electron beam selective melting material increase manufacturing of metal parts, relating to the technical field of material increase manufacturing and heat treatment. The method adds a step of secondary heating remelting to melt a forming zone after a step of forming zone melting. The secondary heating remelting parameters comprise the electron beam current scanning speed, the electron beam current, the scanning deflection amount and the focal spot size. The method carries out in-situ heat treatment in the process of part processing forming process, therefore eliminates part of micro holes in the parts, and meanwhile can improve the surface smoothness of the parts, realize micro-structure controlling and realize regulation and control for the mechanical property of forming parts in a certain range.

A laser welding apparatus includes a laser welding unit including a first lens adapted to focus a laser beam; a second lens adapted to diffuse the laser beam to the first lens; and a third lens adapted to guide the laser beam to the second lens. The relative positions of the first lens, the second lens, and the third lens, are adjusted to adjust a diffusion angle and a beam width of the laser beam entering the first lens. The laser welding apparatus performs: actuating the laser welding unit to travel at a predetermined speed along a predetermined trajectory; directing the laser beam at a first welding spot; adjusting the focal length to focus the laser beam at the first welding spot; holding the laser focal spot size substantially constant; and directing the laser beam at a second welding spot after completion of welding for the first welding spot.

A method of cutting polycarbonate thin sheets generally less than 2 millimeters includes providing a source of pulse ultraviolet (UV) radiation. In operation, the method includes directing the UV radiation at the polycarbonate sheet to photo-ablate the polycarbonate sheet. A combination of parameters associated with the radiation may be selected, including at least one of a group of fluence, speed, coating of polycarbonate, number of passes, increasing or decreasing focal length, changing focus position and focus spot size.

A method for controlling focal spot size changes of an x-ray source in an imaging system includes measuring focal spot sizes as a function of a plurality of x-ray source operating parameters, determining a calibration table or transfer function utilizing the measured focal spot sizes as a function of the plurality of x-ray tube operating parameters, and utilizing the calibration table or transfer function to control focal spot size variations during operation of the imaging system.

An X-ray imaging apparatus includes an X-ray generation part, an X-ray detection part, and a revolution drive mechanism. The X-ray generation part has an X-ray generator including a cathode and an anode, and emits an X-ray beam from the X-ray generator. The X-ray detection part detects the X-ray beam. The revolution drive mechanism performs X-ray imaging by revolving the X-ray generation part and the X-ray detection part around the object while the X-ray generation part and the X-ray detection part are opposed to each other with said object interposed therebetween. The X-ray imaging apparatus controls a restriction part to thereby restrict an X-ray transmission in such a manner that the focal spot size of an X-ray beam used in X-ray CT imaging of a relatively narrow imaging region is smaller than the focal spot size of an X-ray beam used in X-ray CT imaging of a relatively large imaging region.

An air-coupled ultrasonic phased array detection device, the transmission signal is sent to the air-coupled ultrasonic probe by the ultrasonic transmitter receiver, and the ultrasonic wave excited by the probe is incident into the inside of the test piece at a certain angle; The wave signal is received by the ultrasonic probe and transmitted to the signal receiver. The signal is amplified by the preamplifier and enters the data processing unit. After delay superposition and imaging processing, the imaging of the scanning result at a certain angle is completed. Scanning in multiple angles and depth directions can be completed through different emission pulse settings without moving the probe, and a wide range of detection results can be obtained from the content of the tested specimen. Because the air-coupled ultrasonic probe is used, there is no need to touch the detection surface during work, which prolongs the service life of the probe; through the parameter setting of the transmission waveform in the early stage, the length of the focal column, the size of the focus and the direction of the sound beam can be optimally controlled. It has certain advantages in terms of ratio and defect detection rate.

An x-ray optical system includes a multiple corner optic assembly including an adjustable aperture assembly located in close proximity to the optic assembly. The adjustable aperture assembly enables a user to easily and effectively adjust the convergence of an incident beam of x-rays or the optic focal spot size. The adjustable aperture assembly may further enable a user to condition x-rays of one wavelength and block x-rays of another wavelength and thereby reduce the amount of background radiation exhibited from x-rays of more than one wavelength.

A high-resolution imaging approach is described. The described approach includes use of a small focal spot size and positioning of the patient offset from the center of the imaging volume. The off-center displacement is combined with a small focal spot size and with modified image reconstruction methods to provide high intrinsic spatial resolution without hardware changes to the imaging system.

It is described a method for measuring the sharpness in an X-ray system (100). The measurement is based on a common edge response. An edge device (120) representing the projection device is placed within a beam-shaping device (470). Due to a high geometrical magnification factor the edge response function (241a) and also both an impulse response function (246a) and a modulation transfer function (251a) will predominately depend on the size of the focal spot (112) rather than on a pre- sampling spread function of a detector (130) being used for receiving the X-radiation (117), which has laterally passed the edge device (120).

The invention discloses a method and system for determining a curved surface structure of a long-focal-length non-spherical reflector. The method and system can determine the curved surface structureof the long-focal-length non-spherical reflector, so as to prepare the non-spherical reflector with the uniform long focal length characteristic according to the curved structure. Compared with a conventional parabolic reflector, the non-spherical reflector prepared according to the curved structure is equivalent in technical implementation difficulty, can achieve the same lateral focal spot size,also can enable the long focal length to be prolonged by 10-100 times, and achieves a small focal spot and the long focal length, so the non-spherical reflector is good in application prospect for astrong field of high-power laser and material interaction.

A cathode assembly design is provided that includes two flat emitters, a longer emitter filament and a shorter emitter filament. In one implementation the focal spot sizes produced by the long and short emitters overlap over a range. Thus, one emitter filament may be suitable for generating small and concentrated focal spot sizes while the other emitter filament is suitable for generating small and large focal spots sizes.