Xiaolong Bai

Bio: Xiaolong Bai is an academic researcher. The author has contributed to research in topics: Ultrasonic sensor & Scan line. The author has an hindex of 2, co-authored 2 publications receiving 9 citations.

Method for scanning ultrasonic microscope to image by means of multi-layer scanning simultaneously

Abstract: The invention discloses a method for a scanning an ultrasonic microscope to image by means of multi-layer scanning simultaneously, which comprises the steps of: 1) moving a Z-axle motor after the scanning ultrasonic microscope is started up, so that focal spot of an ultrasonic focusing probe is arranged in the middle of a depth range concerned by a material to be measured, and a scanning image A is obtained; 2) amplifying the scanning image A, so that a whole window of an oscilloscope is bestrewed by the scanning image A; 3) setting a value N as required, equivalently dividing the scanning image A into N regions along with the axis of abscissas, i.e. a time axis; 4) respectively taking a maximum value of each region echo signal, and converting the maximum values to be N corresponding grayvalues, i.e. the size of each gray value of pixel points of N layer images on the position; and 5) controlling an electrical machine to drive the ultrasonic focusing probe to scan line by line in an XY plane, i.e. the N layer images of the material to be measured can be obtained. The method is used for imaging a plurality of layer surfaces of the material to be measured within one C scanning time, so that a detection result which is more detailed is obtained, and the method is convenient in analysis.

Simultaneous measurement of elastic moduli, attenuation, density, and thickness of a layer by ultrasonic spectroscopy using point-focus transducer

Abstract: This paper presents an ultrasonic technique for simultaneous determination of the complete set of acoustical and geometrical properties of a layer embedded between two known materials using point-focus transducer, which provides a high lateral resolution. The theoretical model of the two-dimensional spectrum Rt(θ,ω) of the layer is calculated as a function of six parameters: longitudinal and transverse velocities ci, ct, attenuation αi, αt, density ρ and thickness h, which fully determined the layer properties. The experimental spectrum Re(θ,ω) can be measured by V(z,t) technique using point-focus transducer which is verified in our previous work. By minimizing the differences between the theoretical and experimental spectra at normal and oblique incidence, the six parameters of the layer can be derived. The full set of the properties of a 250μm thick stainless steel layer immersed in water are determined using this technique as an example. This measurement technique enables precise measuring of the local full set properties of layers.

Water immersion ultrasonic phased-array detection device and detection method of disc part of aero-engine

Abstract: The invention belongs to the field of nondestructive detection, and relates to a water immersion ultrasonic phased-array detection device and a detection method of a disc part of an aero-engine. The water immersion ultrasonic phased-array detection device comprises a flaw detection water tank (1), a rotary table (2), a control cabinet (3), a three-dimensional moving device (4), an ultrasonic flaw detector, a control computer (6), a probe clamp (7) and an ultrasonic probe. The device is characterized in that the ultrasonic flaw detector is an ultrasonic phased-array flaw detector (5), and the ultrasonic probe is an annular-array ultrasonic phased-array probe (8). The detection method comprises detection steps as follows: system connection is conducted; and ultrasonic echo signals are acquired and recorded. According to the device and the method, the probe is prevented from being changed repeatedly, and the detection efficiency is improved.

Automatic ultrasonic C scanning detection system for annular forging

Abstract: The invention discloses an automatic ultrasonic C scanning detection system for an annular forging. The detection system comprises a mechanical scanning control unit, an automatic control mechanical scanning device, a rotary work platform, a water supply and drainage device, a water spray coupling device, an ultrasonic detection probe, an ultrasonic flaw detector and a communication unit thereof, data acquisition equipment and a C scanning nondestructive measurement unit, wherein the mechanical scanning control unit provides synchronous signals for the C scanning nondestructive measurement unit and controls the motions of the mechanical scanning device and the rotary work platform so as to drive the detection probe mounted in the water spray coupling device to scan; the water supply and drainage device is arranged on the edge of the rotary work platform so as to supply and drain water in real time; the ultrasonic flaw detector transmits and receives pulses through the detection probe and conveys detected echo information to the C scanning nondestructive measurement unit through the data acquisition equipment to perform imaging analysis. By adopting the system disclosed by the invention, the problems in ultrasonic detection of the annular forging with a complicated structure can be solved so that the imaging is accurate and visual.

Method for establishing layer-by-layer C scanning peak value image of ultrasonic scanning microscope

Abstract: The invention relates to a method for establishing a layer-by-layer C scanning peak value image of an ultrasonic scanning microscope. The method comprises the following steps of: setting the total layer-by-layer scanning thickness of a piece to be detected; setting the single-layer scanning thickness of the piece to be detected; uniformly dividing the total thickness into a plurality of layers according to the thickness of the single layer; and carrying out data treatment on the plurality of layers through primary C scanning movement, so as to obtain a plurality of corresponding grayscale images. With the adoption of the method provided by the invention, the problem in the conventional C scanning peak value image technology of low scanning efficiency caused by arranging scanning layers for a plurality of times according to demands and scanning for a plurality of times can be solved by setting the total thickness of the piece to be detected in a layer-by-layer scanning manner and the thickness of piece to be detected in a single-layer scanning way, uniformly dividing the total thickness into the plurality of layers according to the thickness of the single layer, and carrying out the data treatment on data corresponding to the plurality of uniformly divided and resolved layers through the primary C scanning movement, so as to obtain the plurality of corresponding grayscale images.

Low-density material perspective imaging method and system

Abstract: The invention discloses a low-density material perspective imaging method and system, which is used for imaging an inspection device inside a packaging body through ultrasonic wave. The inspection device comprises a first element with a first surface, a second element with a second surface, and a wire connecting the first surface and the second surface; and the first surface and the second surfaceare located in different planes, and the density of the wire is less than 5 grams per cubic centimeter. The low-density material perspective imaging method includes the steps that a first focusing parameter of the first surface and a second focusing parameter of the second surface are obtained; according to the scanning constraint conditions, scanning imaging is carried out on the inspection device, and the scanning constraint conditions are specifically generated according to the first focusing parameter and the second focusing parameter. Not only can the good imaging effect on the first andsecond surfaces be obtained, but also the low-density wire can be well reflected in imaging results; and scanning imaging of elements with low-density wires under the non-destructive condition is realized.

Ultrasonic diagnosis and positioning device for clinical treatment

Abstract: The invention discloses an ultrasonic diagnosis and positioning device for clinical treatment. The ultrasonic diagnosis and positioning device comprises a working table. The front side and the rear side of the working table are each fixedly provided with a first handle. A control switch, a display screen, a host and a first wireless transceiver are installed on the upper surface of the working table. The ultrasonic diagnosis and positioning device is simple in structure and has integrity; due to the arrangement of the first handles, overall movement can be conducted, and carrying is convenient; through the cooperation of an ultrasonic receiver and an ultrasonic emitter, the position of a focus is detected and diagnosed, the principle is simple, implementation is convenient, the ultrasonicreceiver and the ultrasonic emitter can be transversely adjusted along an auxiliary base and can rotate along a stepping motor, and therefore the position is rapidly adjusted and the focus is positioned; through an electric telescopic rod, the height can be adjusted; through the movement of an arm plate, the horizontal position can be adjusted, and therefore the ultrasonic diagnosis and positioning device is suitable for diagnosis and detection of different physiques or different parts, and use is convenient.