88results about How to "Accurate length measurement" patented technology

A Fizeau interferometer apparatus is used for both low and high interference measurement. When irradiating a reference surface and a sample with a low coherent luminous flux, a path-matching passage divides the low coherent luminous flux into first and second paths, while the optical path length difference between the respective luminous fluxes passed through the two paths equals twice the optical distance between the reference surface and the sample. When irradiating the reference surface and the sample with a high coherent luminous flux, the luminous flux is made incident on the sample side of the path-matching passage at a position coaxial with the low coherent luminous flux.

The invention relates to the technical field of electric power, in particular to a system and method for testing the electric conductivity of a metal wire. The system comprises a direct-current power supply, a wire clamping system and a test system. The output end of the direct-current power supply is in series connection with the metal wire to be tested through a fixture. The metal wire to be tested is connected to an optical platform through a fixture. A first camera and a second camera are respectively and electrically connected with a computer. A multiple-pass digital multimeter V is connected with the metal wire to be tested and is further electrically connected with the computer. A multiple-pass digital multimeter A is connected with the metal wire to be tested through the direct-current power supply. Due to the adoption of the system and method for testing the electric conductivity of the metal wire, the electric conductivity of a metal wire of any length and section shape can be tested without considering the effect of the temperature on the resistance of the wire to be tested, and experiments are easy and quick to operate. The system and method greatly improve working efficiency, obviously improve testing accuracy and are suitable for all kinds of novel energy-saving metal wires.

The invention discloses a tubular structure length measurement system and method based on a three-dimensional medical image. According to the measurement system and method, by the adoption of the differential summation principle in mathematics, length value calculation of a tubular structure is converted into cumulative calculation of distances between a series of adjacent slices, wherein first, acenter line of the tubular structure is extracted; second, a normal plane is constructed based on the center line, the tubular structure is subdivided into a series of two-dimensional sections, and the range of a region-of-interest is determined on an image subjected to straightened surface reconstruction; and last, the sum of wall distances, between the adjacent sections contained in the region-of-interest, of the tubular structure is calculated, and a needed length value of the tubular structure is obtained. Therefore, precise measurement of the length of the tubular structure is realized,and the measurement system and method can be widely applied to the fields of intravascular stent preoperative planning, plaque length measurement, thrombus length measurement, angioma and interlayer measurement, intestinal polypus measurement, etc.

The invention discloses a magnetic resonance imaging-based perforator flap blood vessel positioning and measurement method, which comprises the following steps of: acquiring a magnetic resonance image of human subcutaneous tissues, and selecting a reference point from the image; searching for a position where a perforator flap blood vessel penetrates a muscle in the image, and setting mark points; reading imaging coordinates of the reference point and the mark points, and calculating displacement between the reference point and each mark point; tracking and segmenting the blood vessel, and calculating the length and diameter of the perforator flap blood vessel; and projecting all the mark points onto the surface of skin to obtain a perforator flap blood vessel mark image on the surface of the skin. The method can be used for accurately positioning the perforator flap blood vessel and accurately measuring the length and diameter of the perforator flap blood vessel, and is short in manual operation time and high in efficiency.

The invention relates to the field of medical apparatuses, and discloses a disposable tubular viscera tying lift apparatus. The lift apparatus comprises a lock fastener, a lift ring and a protective cover. The lock fastener is a key component composed of a tying strap and a locking unit, one side of the tying strap is provided with antislip convex teeth, the other side is provided with length scales, the tying strap surrounds the tubular viscera by a circle, the movable end penetrates the locking unit prior to being tightened, and then the tubular viscera such as the esophagus, intestine and stomach can be tied, blocked, lifted and subjected to length measurement. In laparoscopic surgery, the lock fastener can be used individually, and the lift ring and the protective cover are designed for use in combination for laparotomy operation. The disposable tubular viscera tying lift apparatus is compact, elastic and flexible, and is convenient to use in narrow operation space. Compared with the past common gauze and other instruments, the disposable tubular viscera tying lift apparatus has the advantages that the no-tumor procedure during tumor distal bowel resection in laparoscopic radical rectectomy for rectal cancer is well realized; difficulty in open rectal carcinoma radical operation is lowered greatly; the disposable tubular viscera tying lift apparatus is taken out with specimens to be discarded at the end of operation.

The invention relates to a measuring device (10) and a method for determining a length measurand of a workpiece. A carrier part (13), on which a probe unit (18) is arranged immovably in a first spatial direction (x), can be moved or positioned by means of a positioning arrangement (12). At least one laser interferometer (24) is connected to the carrier part (13) immovably in the first spatial direction (x). By means of a first laser measuring beam (L1) and a second laser measuring beam (L2), the laser interferometer (24) generates a first measurement signal (S1), which measurement signal describes the distance of the laser interferometer (24) from a first reflector (25) in the first spatial direction (x), and a second measurement signal (S2), which describes the distance of the laser interferometer (24) from a second reflector (26) in the first spatial direction (x). A probe system plane (E), which is immovable in the first spatial direction (x) relative to the carrier part (13) or the probe unit (18) and which extends at right angles to this first spatial direction (x), therefore has a position in the first spatial direction (x) that can be determined by means of the distances of the laser interferometer (24) from the first reflector (25) and the second reflector (26).

The invention relates to a robot used for electric power pipeline inspection. The robot comprises a control device used for receiving and processing video and distance measurement signals, a detectiondevice, a distance measurement device used for carrying out inner wall distance measurement, a communication device and a drive device. The detection device is used for detecting whether cracks, obstacles and the blocking situation exist in electric power pipelines or not in real time. The communication device is used for transmitting the in-pipeline condition detected by the detection device andthe distance signals measured by the distance measurement device, and the robot can be controlled by an upper computer. The drive device is responsible for providing power for the robot. The robot ishigh in measurement precision, the blocking condition in the electric power pipelines can be remotely controlled and accurately measured, and the cost is relatively low.

The invention discloses a method for predicting an FRP-concrete beam interface crack length under a variable amplitude fatigue. The method comprises the steps of firstly applying a static load to a static load test piece, and obtaining the ultimate bearing capacity of the FRP-concrete beam during damage, designing the maximum load of constant-amplitude fatigue according to the static load bearingcapacity, applying a constant-amplitude fatigue load to the constant-amplitude fatigue test loading test piece, and obtaining a stress-fatigue life relation curve under constant-amplitude fatigue according to test data, then applying a crossed variable-amplitude fatigue load to the variable-amplitude fatigue test loading test piece for testing, and predicting the crossed variable-amplitude fatiguelife of the test piece by correcting a Miner criterion according to test data and the obtained stress-fatigue life relation curve, and finally, designing a crack propagation length prediction formula, and substituting the crossed variable-amplitude fatigue life into the formula to obtain an interface crack length prediction value of the test piece under crossed variable-amplitude fatigue. The FRP-concrete interface crack propagation length under the crossed variable-amplitude fatigue can be accurately measured.

A pattern measurement apparatus includes a beam intensity distribution creation unit to scan a charged particle beam over a reference pattern having edge portions formed at a right angle to create a line profile of the reference pattern and thus create a reference-beam intensity distribution, an edge width detection unit to determine line profiles for pattern models including edges formed at various inclination angles by use of the reference-beam intensity distribution and calculate edge widths reflecting an influence of a width of a reference beam, and a correspondence table creation unit to calculate correction values for edge positions from the calculated edge widths and the pattern models and create a correspondence table in which the edge widths and the correction values are associated with one another.

The invention discloses a medical material for treating uterine prolapse. The medical material is characterized in that an anchor net is arranged to be a strip-like sheet, wherein clamping fins raised and extending from the two side edges are arranged at the bottom of the anchor net; cutting separation lines are arranged on an upper section of the anchor net on a body of the anchor net; when the anchor net is transversely sheared at the upper ends of the cutting separation lines, the anchor net at the positions of the cutting separation lines on a lower section can be separated into net pieces; a lead fixing hole and a bottom fixing hole are formed at an interval along the length direction of the anchor net in the lower section of the anchor net; the line end of a suspending line can sequentially penetrate through the bottom fixing hole and the lead fixing hole and form a contracted and fixed net knot around the lead fixing hole surrounding the anchor net. According to the medical material, the anchor net can be ensured to be accurately placed, the net pieces are conformally and loosely rooted to the abdominal wall to ensure and improve the anchor effect of the anchor net in the abdominal wall, and the middle part of the suspending line is accurate in positioning.

The invention provides a seed quality detection method and device based on structure hyperspectrum. The device is composed of a mechanical arm base, a mechanical arm, a vacuum seed suction module, a structured light projection module, a white light source, an optical fiber, a hyperspectral camera, a computer, a signal line and seeds. The seed quality detection method based on structure hyperspectrum comprises the following steps: calibrating a seed quality detection device based on structure hyperspectrum, acquiring seed three-dimensional phenotypic information, acquiring seed characteristic spectrum information and two-dimensional texture information, and modeling a seed vigor prediction model based on support vector regression (SVR). A structured light three-dimensional imaging technology is adopted, three-dimensional size information such as the length, the width and the volume of the seeds can be accurately measured, hyperspectral information of the seeds at different depths can bedetected through a structured light modulation technology, the information dimension is expanded, and the detection precision of the seed vigor index is improved.

The invention discloses a dragging length-measuring thin plate hydraulic cutter. An upper cross beam is fixed on an open door frame, a hinge seat is arranged on the upper cross beam, the upper end of a guide post is hinged with the hinge seat, the lower end of the guide post is respectively connected on a baseframe, symmetric guide frames are fixedly connected on the two sides of an upper cutting blade, guide sleeves arranged on the guide frames are in movable fit with the guide post, idler wheels of the guide frames are matched with a lining plate of the open door frame, a suspension beam is fixedly connected onto the open door frame, a cylinder and the guide sleeves in fit with the guide post are all fixed on the suspension beam, the end part of a piston rod of the cylinder and the lower end of the guide post are connected with a movable base plate, a rubber roller is mounted on the back surface of the movable base plate, a motor drives the rubber roller to rotate, a built-in bearing and an encoder connecting rod structure are arranged, and a free roller matched with the rubber roller is arranged on the baseframe. The dragging length-measuring thin plate hydraulic cutter disclosed by the invention has multiple using functions and has the advantages of flattening strip steel, centring, dragging and auxiliary strip penetrating, cutting head, tail and middle part of the strip steel, cutting and shunt winding, accurately measuring length and speed of the rolled strip steel and the like, improving strip penetrating speed and cutting speed, ensuring production safety and improving production efficiency.

The invention relates to the technical field of nondestructive flaw detection, and concretely relates to an ultrasonic flaw detection and defect positioning and measuring apparatus and a use method thereof. The apparatus is used for onsite ultrasonic nondestructive flaw detection, auxiliary positioning of a hiding defect and measurement of the length of the defect, and the apparatus used to position and measure the length allows positioning and length measurement to be visually and accurately carried out, and is simple to operate.

The invention discloses a microscopic dynamic monitoring device and a repairing method for a ceramic historical relic painting layer micron-scale crack. The device is formed by connecting a work bench, an ultra depth-of-field microscope, a repairing table, a tripod, a rotating shaft, an adjusting frame screw and a lens. When the ceramic historical relic painting layer micron-scale crack is repaired by the device, a cultural relic is arranged on the rotating shaft; a lens of the ultra depth-of-field microscope is adjusted to amplify a historical relic painting layer; the micron-scale crack is positioned through an image processor; the lens is adjusted by rotating the tripod, so that the image processor clearly displays the crack and then fixes the cultural relic; the crack is repaired with a reattachment repairing agent; and the whole repairing process is recorded and taken. According to the microscopic dynamic monitoring device disclosed by the invention, the painting layer micron-scale crack can be accurately positioned; the crack size can be accurately measured; multi-angle and multi-azimuth observation is achieved; an image and a video in the repairing process can be collected in real time; data and image collection is visual and accurate; and the repaired crack is completely closed and fitted.

The invention relates to an automatic measurement system for oil pipe string operation, which is composed of a rotating laser, a pulley, a photosensitive scale detector, a suspension weight sensor, electric power and signal cables, and a reading display instrument, which solves the troublesome oil pipe string operation The problem of string length measurement for many years has overcome the disadvantages of manual measurement, low precision, cumbersome and error-prone, the instrument is easy to install and use, with less manual intervention during use and a high degree of automation. Accurate string length measurement is the follow-up Drilling and oil production operations provide technical quality assurance.

The invention provides a fixed-length cutting facility for a flat steel strip of an elevator. The fixed-length cutting facility for the flat steel strip of the elevator comprises an unwinding device, a length measuring device, a traction device, a cutting device, a tension adjusting device, a winding device and a control device, wherein the control device is connected with the unwinding device, the length measuring device, the traction device, the cutting device, the tension adjusting device and the winding device. The length measuring device calculates the length of the conveyed steel strip according to the rotating cycle number of a rolling wheel. The traction device is used for driving the flat steel strip to be conveyed backwards. The cutting device comprises a disk cutting saw blade and a steel blade, wherein the disk cutting saw blade and the steel blade are arranged in an adjacent mode. The preset length is set in the control device, and when the length of the conveyed steel strip is equal to the preset length, the cutting device is started. Compared with the prior art, the fixed-length cutting facility for the flat steel strip of the elevator has the advantages that the length of the steel strip can be accurately measured by the length measuring device, the level of automation of the production process is improved, and the problems caused by manual measurement of the length are solved.

The invention relates to the technical field of welding, in particular to an arc length adjuster. The arc length adjuster comprises a sliding mechanism, a welding gun fixing mechanism, a cooling mechanism and a signal collector. The sliding mechanism is provided with a movable sliding block guide groove matched with a fixed block guide rail. The welding gun fixing mechanism is installed on a movable sliding block. A welding gun is installed on the welding gun fixing mechanism. Electrodes, corresponding to the welding gun, of the cooling mechanism are immersed in cooling water. The signal collector is connected with a welding loop. By means of the arc length adjuster, a welding arc can be stably ignited, and meanwhile, the length of the arc can be continuously adjusted and accurately measured, data are collected through circuit control, and welding current and arc welding voltage can be collected at the same time.

There is provided a substrate possessing a substrate main body in whose surface there is formed a measurement object article, and a reference scale having been provided, on the surface of the substrate main body, in the vicinity of a region where the measurement object article is formed so as to extend in at least one direction, wherein the reference scale has plural graduations which have been formed by utilizing a focused ion beam FIB and adjacently disposed for every spacing having been previously determined.

The invention discloses a table-type accurate cable length measuring instrument. The table-type accurate cable length measuring instrument comprises a workbench, a plate which is movably supported by the workbench, a screw passing through a screw hole in the workbench, a rotary plate rotationally connected with the workbench, and a length measuring instrument, wherein a gap through which a cable can pass is reserved between the plate and the rotary plate; and the length measuring instrument comprises a display plate and is capable of measuring the rotation distance of the rotary plate. The table-type accurate cable length measuring instrument is simple in structure, can measure the cable length accurately and does not influence the normal traction of a cable.

The invention discloses a length measuring device of a loom. The length measuring device comprises a rack, wherein the rack is provided with a loom main shaft, a mechanical length measuring mechanism and an electronic length measuring mechanism, the mechanical length measuring mechanism comprises a length measuring wheel, and the length measuring wheel is arranged on the rack through a length measuring wheel seat; the rack is also provided with a transmission mechanism which is used for transmitting the power of the loom main shaft to the length measuring wheel; the electronic length measuring mechanism comprises an electronic length measurer and a pressing wheel, the pressing wheel is positioned above the length measuring wheel, a yarn flying gap is formed by the match of the pressing wheel and the length measuring wheel, the electronic length measurer is positioned above the pressing wheel, the inner part of the electronic length measurer is provided with an encoder which rotates synchronously with the loom main shaft, and the bottom part of the electronic length measurer is provided with an electromagnetic needle directly facing the pressing wheel. According to the length measuring device disclosed by the invention, the structure is simple, the operation is easy, the length measurement of yarn is realized by adopting a matching mode of the electronic length measuring mechanism and the mechanical length measuring mechanism, and the length measuring can be more accurate.

The invention discloses an air supply control method and device and air conditioning equipment. The method comprises the steps of acquiring the temperature change time required by an air conditioner indoor unit pipeline to reach the target temperature when each air supply pipeline is separately communicated, wherein the target temperature is the temperature of the indoor space communicated by thecurrent communicated pipeline; and determining the length of each air supply pipeline according to the acquired temperature change time of each air supply pipeline, wherein the length is proportionalto the temperature change time. Through the air supply control method and device and the air conditioning equipment, the length of the air supply pipelines can be accurately measured, the air supply parameters can be adaptively adjusted, and the comfort is improved.