316 results about "Micro defects" patented technology

An apparatus according to one embodiment includes an endoscope tip including a housing that is monolithically formed of a transparent material. At least one optical component is at least partially encased within the housing. The optical component can be, for example, a light source, a fiber optic, an imaging sensor, a lens, a reflector or a light shield. In another embodiment, an apparatus includes an endoscope having a distal end portion that includes a housing. The housing is monolithically formed with a transparent material and a light source is at least partially encased within the housing. The housing also includes a micro-defects portion within the transparent material of the housing. The micro-defects portion is configured to provide a selected output shape of a beam of light produced by the light source.

The invention relates to a material mechanical property in-situ testing system and method in a dynamic and static load spectrum, and belongs to the field of mechanical tests. The system integrates the following functions: a static testing function of biaxial drawing and shearing in an orthogonal plane, a shearing static testing function, a double shaft pull-pull mode fatigue testing function, and a static/dynamic press testing function. A complicated static/dynamic load spectrum can be established. Multi-mode composite load mechanical property evaluation can be performed on a film material or a block material, for example: high-cycle fatigue tests based on double-shaft pre-stretching load and impact press tests based on double-shaft stretching-shearing pre-load. At the same time, special defects are pre-fabricated on the central area and cross shaped arm area of a test piece; the analysis functions of a variable-zoom optical imaging system or a digital speckle strain analysis system can be utilized; the provided system and method can also be used to research the deformation behavior and cracking expansion rules of micro defects in a component under a multi-dimensional stress, and an evaluation tool is provided for performance degradation rules of products and optimized preparation method of materials.

In the conventional methods for enhancing defect detection sensitivity by improving the resolving power, if a microscopic pattern, which is a high spatial-frequency structure as is the case with a microscopic defect, has become the brightest portion, the gray-scale contrast of the microscopic defect will be enhanced. At the same time, however, the gray-scale contrast of the microscopic pattern will also be enhanced simultaneously. Consequently, there has existed a problem that it is impossible to enhance the microscopic-defect detection sensitivity further than that. In the present invention, an aperture stop which is divided into a plurality of small apertures is located on an illumination pupil plane. Then, light-shield/light-transmission for each small aperture is controlled independently of each other. This control allows an inspection-target object to be illuminated at only an incident angle at which the gray-scale contrast of the microscopic defect will be emphasized more sharply.

A memory device (200) can include a memory cell block (202), a standby current source (206), an active current source (208), and a clamping device (212). In a standby mode, a standby current source (206) can provide constant standby current I_STBY to memory cell block (202) via block supply node (204). In an active mode, active current source (208) can provide current to accommodate current necessary for active operations (e.g., accessing the memory cell block). A clamping circuit (212) can provide additional current in the event a block supply node (204) potential VCCX collapses due to the presence of micro-defects. In addition, compensation for process variation can be achieved by a self regulating well (454) to source (404) back bias that can modulate the threshold voltage of p-channel transistors of memory cells within the well (454), reducing overall leakage.

The invention discloses semiconductor material growing equipment, and in particular relates to a Czochralski crystal growing furnace for semiconductor single crystal growth. In the invention, the downward motion of a heat shield is used to replace the upward motion of a crucible, so that the crucible can only rotate and not ascend any more, thus, one degree of freedom is reduced and the system complexity is decreased; by adopting dual heaters respectively located at the bottom and the side face of the crucible respectively to control the growth of a crystal by aiming at different stages respectively, the temperature gradient control of the crystal and melt is more convenient; the relative positions between the crucible and the heaters are kept parallel and unchanged, and the heat radiation of the heaters is directly used for baking the crucible, so that the heat transfer efficiency is greatly improved in comparison with that in a traditional method in which the crucible in the traditional single crystal furnace is constantly away from a heating zone; and a flow guiding cylinder is used for guiding argon gas to carry out enhanced heat exchange on the crystal, so that an convection vortex of the argon gas above the melt is inhibited, thus, impurities and micro-defects in the crystal are favorably reduced and the consumption level of the argon gas is decreased.

The invention discloses a machine-vision-based method and a machine-vision-based device for intelligently detecting surface micro-defects of a product. The device comprises a first conveying belt, a second conveying belt, a third conveying belt and a conveying belt driving device, wherein the conveying belt driving device is controlled by a PLC (Programmable Logic Control) system; photoelectric sensors are correspondingly arranged on both sides of the three conveying belts; a coaxial light source and a camera A are arranged on the second conveying belt; the camera A is connected with an image acquisition card, an industrial personal computer, a DAQ (Data Acquisition) card and the PLC system; a non-uniform light source composed of a grating and a parallel light source is arranged above the third conveying belt; a camera B is arranged above the side of the third conveying belt and connected with the image acquisition card; a servo motor of the parallel light source is connected with the PLC system; a defective product elimination unit is arranged at the side edge of the tail of the third conveying belt. By the cooperation of two stations, fine defects can be detected efficiently and accurately, and particularly, the effect of detecting the surface defects of mirror-surface-like products through the grating and the non-uniform light source at the second station is excellent.

The present invention is a method for producing a wafer comprising, at least, a BMD forming step of subjecting a silicon single crystal in a state of an ingot to heat treatment thereby to form bulk micro defects (BMDs) inside, and a wafer processing step of processing the ingot in which the bulk micro defects (BMDs) was formed into wafers. Thereby, there can be provided a method for producing a wafer, wherein heat treatment for providing IG capability in production of wafer can be shortened and wafers with high IG capability can be produced in large quantity. Also, the present invention can further comprise a wafer heat-treating step of subjecting the processed wafer to heat treatment, or an epitaxial growth step of forming an epitaxial layer on the wafer. Thereby, there is improved productivity of annealed wafers or epitaxial wafers that are excellent in gettering capability.

The invention discloses a method for repairing micro-defects inside metal materials which can repair the micro-defects inside the metal materials so as to improve the performance of the metal materials without affecting the thermal deformation of the metal materials. The method comprises the following steps: putting the metal material to be repaired in an external physical field excitation device capable of generating a pulsed magnetic field and a pulsed electric field, and selecting the appropriate field treatment process for processing according to the magnetic property of the metal material and the configuration type of the microscopic defect inside the substrate. In this way, the in-situ repair of internal defects of metal materials can be realized by pulsed magnetic field and pulsed electric field induction. Therefore, the plastic toughness of metal materials is improved, the strength of materials can be increased, the abrasion resistance of materials can be greatly improved, the initiation of microcracks can be restrained and expansion of the microcracks can be delayed, and the fatigue life of the materials can be significantly prolonged. In addition, the whole repair process will not cause significant temperature rise and thermal deformation of the metal material.

The invention relates to a device for preparing silicon single crystal and aims at providing a vertical pulling silicon single crystal growing furnace with a water-cooling jacket. The growing furnace comprises a heater, a quartz crucible and a heat insulating device. The above of the quartz crucible is provided with a thermal shielding device which guards a single crystal rod lifting region; the tube-shaped water-cooling jacket is arranged between the thermal shielding device and the single crystal rod lifting region; and the water-cooling jacket is a hollow jacket device, the interior of which is a channel for cooling water to flow and provided with a water inlet pipe and a water outlet pipe. The newly grown high temperature part of the single crystal rod is cooled by the water-cooling jacket, and large temperature difference ensures the single crystal rod to dissipate heat rapidly, and the growing speed of the single crystal rod can increase nearly one time. As the heat on the growing interface of the single crystal rod can be led away by the single crystal rod, the power consumption of the heater can be reduced greatly and the micro defect of the crystal can be reduced. If the temperature of the used cooling water is lower, the cooling effect is better.

The invention discloses a surface treatment method and a texturing method for diamond wire cutting silicon wafers. The surface of a diamond wire cutting silicon wafer is covered with an amorphous silicon layer caused by cutting, and line marks are densely distributed on the surface of the diamond wire cutting silicon wafer. The surface treatment method comprises the following steps: cleaning and pre-treating a diamond wire cutting silicon wafer; putting the cleaned and pre-treated diamond wire cutting silicon wafer in mixed solution containing metal ions, oxidizing agent and etching agent, and carrying out metal ion adhesion, SiO2 generation through oxidation, and catalytic chemical etching reaction in sequence; cleaning the etched silicon wafer with first cleaning fluid, second cleaning fluid and deionized water respectively, and removing metal particles, an oxide layer and chemical residues on the surface of the silicon wafer; and cleaning the silicon wafer to obtain a silicon wafer which has no line marks and contains a micro-defect amorphous layer. According to the invention, a diamond wire cutting silicon wafer can be effectively textured through a regular process, and the conversion efficiency of a crystalline silicon solar cell prepared with the textured silicon wafer is improved.

The invention relates to a nonlinear ultrasonic phased array imaging method for micro-crack detection. According to the method, an ultrasonic phased array detection system is utilized to collect the detection signals in the sequence focusing mode and the parallel focusing mode, the appropriate receiving delay tr and the width T of the time-domain intercepting window are determined, the intercepted detection signals are subjected to Fourier transform, the sound kinetic energies Es and Ep of the sequence focusing method and the parallel focusing method and the relative energy difference gamma of the two focusing methods are respectively calculated, and the nonlinear source position is determined according to the gamma, ie., the micro-defect position.

The invention discloses a mirror-like object surface optical imaging device and an imaging method thereof. The device comprises a parallel light source, a grating, a camera, a computer and a light source controller for controlling the parallel light source. The camera is connected to the computer. The parallel light source and the grating cooperate to generate a non-uniform light source with light and dark stripes. According to refraction and reflection principles of light, by moving the non-uniform light source, the light and dark stripes can scan the total surface of a scanned object, and the camera is employed to acquire a same position on the object surface continuously in a movement period so as to obtain series of pictures, and subjecting the series of pictures to morphological dilation treatment, and then synthesizing a final target pictures. The device and the method provided by the invention solve the unable imaging problem due to too small mirror-like object surface defects and high reflections, and mirror-like object surface micro-defects and a background can form significant contrast, the noise is small, the gray value difference is great, and defect segmentation can be easy.

To enable accurate and quick decision on the quality of a glass substrate, by precisely calculating the position of a defect in the depth direction, based on the image of a defect photographed, while moving the focal surface of a camera from the surface of the glass substrate to the inside, to obtain a clear image of a micro defects. The focal point of the camera is made to coincide with the position of a defect on the surface of the glass substrate; the gradient of illuminance in color in a boundary between the defect and the background thereof is calculated as a gradient index GI value with respect to a traveled distance from the glass surface, by using the image with the defect photographed, while the focal plane of a camera is moved from the surface of the glass substrate to the back side; the traveled distance, corresponding to the maximum of the gradient index GI value is determined as the position of the defect in the depth direction.

An adaptive optics microperimetry, infrared beacon emits infrared light to the pupil of the subject, the Hartmann wavefront sensor measures the wavefront aberration of the human eye carried by the reflected light of the fundus, and the computer calculates the control voltage based on the measured aberration , driving the wavefront corrector to correct the aberration of the human eye. After the aberration correction is completed, the fixed optotype for fixing the line of sight of the examinee and the optical stimulation optotype for providing optical stimulation to the fundus of the examinee are displayed at a plurality of predetermined positions on the stimulus optotype display device. The pupil camera uses the infrared light emitted by the infrared light source in front of the eye to capture the subject's human eye pupil image and calculate the pupil diameter. The computer controls the change of the optical stimulus visual target according to the change of the subject's pupil diameter, and measures the subject's field of vision. The invention has high reliability, reduces the stimulus redundancy caused by the aberration of the human eye in the visual field test, is beneficial to discover early micro-perspective defects, and provides a powerful tool for the evaluation of the micro-perspective defects of the human eye and the diagnosis of related diseases.

The invention provides a multi-axis linkage mechanical device used for finely repairing micro-defects on a surface of an optical element and relates to a mechanical device for repairing the optical element. The mechanical device is used for solving the problem of the growth of micro-defects generated during a high-energy beam intense laser targeting process of the optical element. A vertical element is vertically mounted on a plate base; an X-axis linear unit is mounted on the plate base; the X-axis linear unit is connected with a Y-axis linear unit through an XY linear unit connector; the Y-axis linear unit is connected to a C-axis rotating unit through two connectors; an operating platform is mounted on the C-axis rotating unit; a fixture body is mounted on the operating platform; a Z-axis linear unit is mounted on the vertical element; the Z-axis linear unit is connected to a B-axis rotating unit through two connectors; a spindle connector is mounted on the B-axis rotating unit; an electric spindle clamping fixture is mounted between a first spindle clamping element and a second spindle clamping element; and a CCD (Charge Coupled Device) tool setter and a monitoring device are mounted on a main mounting surface of the vertical element. The multi-axis linkage mechanical device is used for repairing the surface of the optical element.

The invention discloses a nonlinear ultrasonic guided wave detection method and a nonlinear ultrasonic guided wave detection device for pipeline micro damage. An exciting transducer capable of exciting single guided wave modal state and a matched receiving transducer are adopted, the transducers can wind a pipeline to excite axisymmetric modal states, the receiving efficiency of a second order harmonic signal is improved by a matching and corresponding receiving probe, the detection capacity of the system on second order harmonic waves of the guided waves is improved. The nonlinear change of a material is characterized by detecting the ratio of nonlinear response to propagation distance, nonlinear interference of instruments is effectively reduced, nonlinear ultrasonic guided wave evaluation of the pipeline material is realized, and nonlinear ultrasonic high sensitivity can be used for early detection of the pipeline micro defects.

The invention discloses a construction method for a subway tunnel penetrating through a building in a fractured rock stratum. The construction method mainly comprises the following steps: firstly utilizing a deep hole grouting process to reinforce a stratum; excavating a tunnel by circularly utilizing mechanical excavation and explosion, and after the excavation of a tunnel face is completed, immediately performing primary support in an anchor rod, bar-mat reinforcement, shotcrete and grid combined support manner till the tunnel penetrates through the building; finally performing grouting reinforcement of a tunnel inner deep hole sleeve valve tube. According to the construction method, by utilizing central mechanical excavation and circumferential smooth blasting techniques, the disturbance of the penetrating-tunnel explosion construction to the fractured rock stratums is reduced, the expansion and growth of rock body internal micro-defects are effectively controlled, the expanding and shaking losses to the building are avoided; due to the field vibration speed monitoring, the explosion vibration speed of a to-be-tested point of the building is within 10 mm/s, which meets the standard requirements.

The invention discloses a defect defecting method based on a wide frequency band ultrasonic phase array, which is applied to an ultrasonic phase array transducer consisting of multiple array elements. The defect defecting method comprising the steps of: exciting by multiple array elements by adopting modulation codes, transmitting modified big-timewidth and big-bandwidth linear frequency modulation signals at a transmitting end, gathering the linear frequency modulation signals at a focal point and reflecting the signals; receiving the reflected signals at a receiving end by each array element and distributing the delayed and corrected signals within a same time window range; and implementing matched-filtering within a frequency domain according to the reflected signals received by each array element, coherently combining the matched-filtered signals within the frequency domain to obtain bandwidth signals within the frequency domain, and implementing inverse fast Fourier transform, thus obtaining time domain pulse compression signals. By virtue of the method, the bandwidth of the transmitted signals can be increased and the pulse compression signals with high resolution can be obtained, so that micro defects can be accurately detected.

The invention provides a visual detection method for micro-defects on the surface of a magnetic tile. The method comprises the steps of reading a magnetic tile image, detecting magnetic tile image defects, obtaining a defect region K of the magnetic tile image, and judging whether or not the area of the defect region K is greater than a first set value; detecting the magnetic tile image defects, obtaining a second-class defect effect map of the magnetic tile image, and judging whether or not the length of the second-class defect effect map is greater than a second set value; detecting the magnetic tile image defects, obtaining a circular degree of a communication domain pixel of an edge detection image Q' of the magnetic tile image, and judging whether or not the circular degree of the communication domain pixel of the edge detection image Q' is greater than a third set value, wherein whether or not the defects of the magnetic tile belong to three types can be judged through the threejudgement processes. The visual detection method for the micro-defect on the surface of the magnetic tile is high in adaptability to illumination changes and magnetic tile type changes; various different types of defects of the magnetic tile can all be detected; compared with magnetic tile defect images obtained by means of traditional methods, the magnetic tile defect image obtained by means of the method is clearer and more accurate.