32results about How to "Large measuring depth" patented technology

A surface emission laser light source is used as a tunable laser light source. Since the surface emission laser light source can realize a broad frequency scanning range at a high speed and in the single mode, a coherent length is longer than that of a multi mode light source. For this reason, when a tomography image is calculated by executing the Fourier transform for an output obtained from an interference optical device, measuring depth can be deepened.

The invention belongs to the field of nondestructive testing and relates to a method for nondestructive measurement of a residual stress field in a metal plate through ultrasonic waves. The method for nondestructive measurement of the residual stress field in the metal plate through the ultrasonic waves is beneficial to conducting nondestructive evaluation on the residual stress in the metal plate. The single-time measuring time of the method is only about 20 seconds and is dozens of times less than the single-time measuring time of a traditional X-ray residual stress measuring method, and the detection speed is high; meanwhile, the measurement depth in the method is adjustable, the maximum depth can reach 3mm and is dozens of times that of the measuring depth in the X-ray measuring method, and thus the measuring depth is large. The method is provided for measuring large-range residual stress distribution inside the plate, and a three-dimensional diagram or a contour map of the residual stress distribution can be obtained. The cost for the single-time measuring of the method is dozens of times less than that of the X-ray measuring method, obvious economy is achieved. The method is free of radioactivity and is safer compared with the X-ray measuring method.

The invention belongs to the field of nondestructive detection and relates to a method for nondestructive evaluation of residual stress levels in an aluminum alloy forged piece through ultrasonic waves. According to the method, the phenomenon that the propagation speed of the ultrasonic waves in materials can be affected by stress in the materials to a certain extent is used, and the difference of residual stress levels among different positions in the large size aluminum alloy forged piece is reflected through changes of sound speeds. The method has the advantages of being high in detection speed, large in measuring depth, good in economy and the like. The residual stress in the large size aluminum alloy forged piece is measured through the sound elastic effect of the ultrasonic waves in the method, and the method has the advantages of being high in measuring speed, convenient to use, flexible in measuring range, good in economy and the like. The single-time measuring time of the method is about five minutes and is shorter that the single-time measuring time of a neutron diffraction residual stress measuring method, the detection speed is high, the maximum measuring depth of the method can reach 400 mm, is larger that the measuring depth of the neutron diffraction method, and is much larger that the measuring depth of an X-ray method or a Barkhausen noise method.

The invention discloses a welding seam measuring method based on micro field depth, comprising the following steps: placing a camera with optical amplification factor being more than 2 slantwise relative to the local surface of a welding seam, shooting the local surface of the welding seam twice under the condition of different distance between camera and the local surface of the welding seam, extracting clear bands from two shot images, respectively obtaining the coordinate of each object point which corresponds to each image point on the centre lines of two clear bands in a direction perpendicular to the welding seam to obtain two straight line segments in a world coordinate, carrying out plane fitting by using the two straight line segments to obtain the normal vector value of the local surface of the welding seam, and extracting the boundary of the local surface of the welding seam from any one of the clear bands to obtain the width and the center coordinate of the local surface of the welding seam. The welding seam measuring method can be used to stably and reliably measure the center coordinate, the width and the normal vector value of the local surface of the complex micro-fine welding seam, is easy to operate and has high detection precision.

The invention provides a test block for carrying out ultrasonic inspection on residual stress of an aluminium alloy pre-stretching board by water immersion, belonging to the field of non-destructive inspection. A method for preparing the test block comprises the following steps of cutting a sample, processing the sample and installing the sample. In the method, the water immersion method is adopted for inspection, and the temperatures in stress calibration and stress measurement processes can be ensured to be consistent by controlling the water temperature not to be changed, thus eliminating the effects of temperature difference on the ultrasonic wave speed and eliminating temperature errors; besides, an automatic scanning frame is adopted instead of manual scanning, so that the distance between a probe and the surface of a material to be measured in the measurement process can be ensured not to be changed, thus eliminating the effects of coupling condition difference on sound propagation time and eliminating the coupling errors. The method is beneficial to non-destructive evaluation of the near surface residual stress of the aluminium alloy pre-stretching board.

The invention relates to a method for building a horizontal layered soil electrical model, which comprises the steps of building a composite layered soil model according to magnetotelluric three-dimensional inversion soil resistivity data, selecting the earth surface potential to act as a fitting index, fitting the earth surface potential of a composite model acquired by using a finite element method and the earth surface potential of a horizontal model deduced by using a Green function method by adopting a least square method so as to acquire an objective function of the horizontal layered soil electrical model, carrying out optimization solving on the objective function by adopting a genetic algorithm, acquiring a soil resistivity parameter and the corresponding layer depth of each layer in the horizontal layered soil electrical model, and thus realizing conversion from composite layering to horizontal layering of the model. The method provided by the invention reduces the complexity of the model, improves the reliability of the model, and can provide more accurate soil resistivity model data for analysis of an earth electrode.

The invention, which belongs to the technical field of the measuring instrument, in particular relates to a detection tool for measuring the small diameter of a tapered table at the inner end of a deep hole. The detection tool comprises a main rod and a measuring rod parallel to the main rod. A positioning cone, a fixed clamp and a guide rail are arranged successively at the main rod from bottom to top; the positioning cone is arranged at the main rod in a sliding manner; and the positioning cone and the main rod are arranged coaxially. A measuring slot is formed from the peripheral surface ofthe positioning cone to the axis of the positioning cone; and a scale line is arranged on the end surface of the measuring slot. A handle and a dragging block are arranged on the measuring rod; the handle is arranged on the measuring rod in a sliding manner; and the handle and the guide rail cooperate with each other to drive the measuring rod to approach or move away from the main rod. A vernieris arranged at the dragging block in an overlap joint manner and makes translation along the measuring slot with the dragging block; the vernier is arranged between the fixed clamp and the positioning cone; the axial motion of the vernier is limited by the fixed clamp and the dragging block; and the vernier is separated from the dragging block when the measuring rod is in a zero-gravity state.

The invention discloses an automatic detection method for the flaw of a metal material such as a metal sheet, a bar, a structural section, a tubular product, an angle iron, an iron rail and the like. A detector comprises a magnetic core 1, a primary coil 2, a secondary coil 3, a driving circuit and a detection circuit. When a specific driving voltage is added into the primary coil 2, a closed magnetic field can be generated in a continuous magnetic circuit which is formed by the magnetic core 1 and a metal body 4 to be detected; and when a metal flaw is detected, the parameter of the magnetic field can be changed, the change quantity of the parameter can be transmitted to the detection circuit and a calculation program by induction voltage generated by the secondary coil 3 to be processed, and the relevant parameters of the metal flaw to be detected can be exactly obtained in cooperation with the adjustment of a magnetic core screw bolt 6.

The invention relates to an underground exploring tube and a three-component magnetic survey system. The underground exploring tube comprises a shell (11), a three-component sensor module (12) arranged in the shell (11), a data measurement modulation transmission module (13) connected with the three-component sensor module (12), and a power supply module (14) connected with the three-component sensor module (12) and the data measurement modulation transmission module (13), wherein a non-magnetic vacuum heat preservation pipe used for wrapping the three-component sensor module (12) and the datameasuring, modulating and transmitting module (13) is arranged in the shell (11). The underground exploring tube is advantaged in that accuracy of deep positioning and inference interpretation of deep ore body (3000-5000m) exploration is improved, and a powerful support is provided for searching deep and hidden mineral resources.

The invention discloses a modulation profile measurement system and method based on inclined focusing and rotary scanning. The method comprises the steps that a grating is placed in an inclined optical axis manner, a clear image surface of the grating is an inclined plane in a measurement space, a high-reflection mirror is placed behind a projection lens, and the optical axis is deflected by nearly 90 degrees; the reflection mirror is rotated to enable a fringe clear imaging surface to complete scanning of the surface of a whole measured object, a CCD camera synchronously captures a fringe pattern carrying object surface information through a beam splitter, a modulation degree curve of each pixel is obtained through fringe light intensity information by means of a phase shift technology, and according to the obtained modulation degree peak value sequence number, the height of each pixel can be reconstructed by utilizing known system mapping parameters. According to the invention, axial scanning is replaced by rotary scanning, so that the measurement system is more flexible and compact, and the measurement depth can be obviously enlarged by obliquely placing the grating.

The invention relates to a design method for a deep-well three-component magnetic survey system, and the method comprises the steps: S1, generating an exploring tube structure scheme of an undergroundexploring tube in the deep-well three-component magnetic survey system based on the physical environment of the depth detected by the deep-well three-component magnetic survey system, generating a ground acquisition control system scheme of a ground acquisition control system of the deep well three-component magnetic survey system; s2, generating an exploring tube test scheme of the underground exploring tube based on the exploring tube structure scheme; and S3, generating a communication link scheme for establishing communication connection between the underground exploring tube and the ground acquisition control system based on the exploring tube structure scheme and the ground acquisition control system scheme. According to the scheme, the accuracy of deep positioning and inference interpretation of deep ore body (3000-5000m) exploration is improved, and a powerful support is provided for searching deep and hidden mineral resources.

The invention discloses a concrete carbonization depth detection device. The device comprises a drilling machine, a drill bit and a reading ruler; the drill bit is mounted on a rotating shaft of the drilling machine; the reading ruler is telescopically mounted on the drilling machine; the reading ruler and the drill bit are arranged in parallel; a central hole is formed in the center of the drillbit; the central hole is cylindrical; the central hole penetrates through one end, away from the drilling machine, of the drill bit; a long and narrow observation hole is further formed in the circumferential surface of the drill bit; and the observation hole is parallel to an axis of the drill bit. When the device is used for carrying out concrete carbonization depth detection, a large pit is notrequired to be chiseled, and the detection can be carried out only by drilling a small block on concrete, so that the damage to a concrete component is relatively small, and meanwhile, the measuringdepth is relatively large.

The invention discloses an auxiliary tool of a height gauge for ruling of a fitter. The auxiliary tool at least comprises a connecting block connected with a measuring jaw of the height gauge, and a ruling arm connected with the connecting block, wherein the connecting block is a strip-type metal block; a first connecting hole connected with the measuring jaw is formed in one end of the connecting block; a second connecting hole connected with the ruling arm is formed in the other end of the connecting block; the axis of the first connecting hole is parallel to that of the second connecting hole; a first jack screw hole for fastening the measuring jaw in the first connecting hole is formed in the connecting block; a second jack screw hole for fastening the ruling arm in the second connecting hole is formed in the connecting block; a first jack screw is arranged in the first jack screw hole; and a second jack screw is arranged in the second jack screw hole. With the adoption of the auxiliary tool, the ruling requirement of a deep groove can be met; when the auxiliary tool is not in use, the auxiliary tool can be dismounted directly from the measuring jaw of the height gauge, and normal use of the height gauge is not affected.