45 results about "Strong focusing" patented technology

A particle beam to treat malignant tissue is delivered to a patient by a gantry. The gantry includes a plurality of small magnets sequentially arranged along a beam tube to transfer the particle beam with strong focusing and a small dispersion function, whereby a beam size is very small, allowing for the small magnet size. Magnets arranged along the beam tube uses combined function magnets where the magnetic field is a combination of a bending dipole field with a focusing or defocusing quadrupole field. A triplet set of combined function magnets defines the beam size at the patient. A scanning system of magnets arranged along the beam tube after the bending system delivers the particle beam in a direction normal to the patient, to minimize healthy skin and tissue exposure to the particle beam.

The invention relates to a high power microwave plasma chemical vapor deposition device for a diamond film, and belongs to the technical field of preparation of diamond films. The device comprises an upper cylinder and a lower cylinder of a resonant cavity, a deposition table for depositing the diamond film and a resonant cavity main body formed by semi-ellipsoidal microwave reflectors. The semi-ellipsoidal microwave reflectors are in smooth transition with the upper cylinder of the resonant cavity in shape, thus, guaranteeing that microwave entering into the resonant cavity is not scattered. At the same time, the semi-ellipsoidal microwave reflectors are arranged, so that the resonant cavity has strong focusing capacity of a microwave electric field for the convenience of focusing microwave energy above the deposition table so as to form a strong electric field area and high-density plasmas. The positions of the semi-ellipsoidal microwave reflectors are adjusted to adjust the resonant cavity of the device, so that distribution of the microwave electric field and plasmas in the device are optimized in real time. At the same time, a quartz glass window in the device is located below the diamond film deposition table, and other main parts of the device are far from the plasmas and can be directly cooled by water better.

A color picture tube device with a coaxial electron gun that makes it possible to avoid design difficulties by implementing a technique of applying a dynamic voltage to the OLF lens. The electrode plates in the shape of protrusions are attached to the field correcting electrode plates parallel to each other along the horizontal scanning direction. The field correcting electrode plates are horizontally long and flat plates in which three holes are provided. The shape of the plates is similar to that of the peripheral electrodes. hole. This structure allows the quadrupole lens to be formed by an auxiliary lens having a strong focusing effect in the horizontal direction and a diverging effect in the vertical direction, which can increase the HV difference. As a result, the dynamic voltage can be reduced without the design difficulties of the prior art, which does not have such a ledge-shaped electrode plate.

The invention discloses an optical device of a flexible implantable nerve photoelectrode, which is arranged on a flexible polymer substrate and includes: an input grating, a waveguide and an output grating, the input grating is a parallel grating for coupling incident light, and the input of the waveguide The end of the waveguide is coupled to the input grating, the output end of the waveguide is coupled to the output grating, and the output grating is a focusing grating, which is used to couple and focus light on the recording electrode to provide optical stimulation with single-cell resolution. The invention also discloses the design and preparation method of the optical device. The optical device of the flexible implantable neural photoelectrode provided by the present invention provides single-cell resolution optical stimulation and in-situ recording through the design of the waveguide and grating; the small size of the device can reduce implant damage, and it has low loss and high Coupling and strong focusing; its high integration is conducive to the realization of multi-channel, high-density nerve stimulation and recording; the use of flexible polymer substrates can reduce the formation of nerve scars and achieve long-term stable work in vivo.

The invention provides a water immersion ultrasonic flaw detection method for rolling steel defects, belonging to the technical field of water immersion ultrasonic nondestructive testing. In the present invention, the thickness of the water layer of each focusing probe is different, the focusing probe is fixed on the water immersion ultrasonic flaw detector by the fixture, and the multiple focusing probes are controlled by software to move together to ensure that each focusing probe can The scanning area of ​​the steel is scanned once, and the scanning results of each focusing probe are displayed on the computer, and then the scanning results of each focusing probe are combined to more accurately analyze whether there is Defect, because the focal points of each focusing probe are distributed in the thickness direction of the rolled steel to be tested, the signal near the focal point is much stronger than other positions of the sound beam, so the scanning signal of the focusing probe can be effectively enhanced by the method of the present invention, Make the detection result more accurate.

The invention is a particle light manipulation device based on a ring-core coaxial helical waveguide fiber. It is characterized in that: the device is composed of a ring-core coaxial helical waveguide fiber 1, and the fiber end of the fiber is ground to form a truncated cone 2 at the fiber end; the ring-core coaxial helical waveguide fiber 1 includes a cladding 3, a ring core 4 and a central core 6 consisting of multiple helical waveguides 5. On the one hand, the device can emit a strong focused annular light field 10 through the fiber end of the ring-core coaxial helical waveguide fiber 1, realize stable three-dimensional capture of the particle 11 near the focal point outside the fiber end, and realize the positioning and positioning of the particle 11. On the other hand, the fixed-axis rotation 15 and rotational ejection 16 of the particles 11 can also be realized by controlling the energy of the phase vortex beam 14 emitted from the helical fiber core. The invention can be used in the fields of optical information transmission, optical micromanipulation, microscopic imaging, light manipulation of tiny particles such as medicine particles, and application of optical fiber integrated devices.