Song Shuxiang

Bio: Song Shuxiang is an academic researcher. The author has contributed to research in topics: Light beam & Grating. The author has an hindex of 2, co-authored 2 publications receiving 6 citations.

Phase shifting optical projection three-dimensional measuring system and method

Abstract: The invention relates to a phase shifting optical projection three-dimensional measuring system and method. A laser is generated by a single-mode laser device and is expanded into light beams through an optical beam expanding system. The light beams pass through a one-dimensional beam splitting grating and forms two light beams. The two light beams pass through an acousto-optic modulator and generate Bragg diffraction and are projected to a beam-combiner after angles are adjusted to form an interference light path. The interference light path passes through a focusing lens and is amplified by a projection object lens. Interference fringes are generated and projected to a measured object. The interference fringes projected on a surface of the measured object are captured by a CCD camera. The interference fringes are processed by a computer and finally a three-dimensional morphology of the measured object is recovered. The system combines an acousto-optic modulation technology with a phase shifting fringe frequency conversion technology, fast measures the three dimensional morphologies of the surfaces of the multiple objects with different structures on-machine, has the strong vibration resistance capability, realizes the on-machine measurement in a processing process, and especially has strong robustness for the object surface with the complex structure.

Phase shift formula optical projection three -dimensional measurement system

Abstract: The utility model relates to a phase shift formula optical projection three -dimensional measurement system, expand the system of restrainting by the single -mode laser lasing through optics and spread into the light beam, the light beam forms two bundles of light behind one -dimensional beam splitting grating, the two bundles of light projects to close through angle of adjustment respectively again after producing bragg diffraction behind the acoustic optic modem and restraints the vessel shape and become to interfere the light path, it is amplified by projection objective behind focusing lens to interfere the light path, generate the interference fringe projection to the testee, the projection is acquireed the back to the surperficial interference fringe of testee by the CCD camera and is handled the final three -dimensional appearance of a testee that resumes through the computer. This system combines together acousto -optic modulation technique with phase shift stripe variable frequency technology, can be at the three -dimensional appearance on the multiple not isostructure object of quick -witted rapid survey surface, and the anti -vibration ability is stronger, also can realize measuring at the machine in the course of working, especially has stronger robustness to the object surface that the structure is complicated.

Three-dimensional measurement method based on improved multi-frequency stripe structured light

Abstract: The invention discloses a three-dimensional measurement method based on improved multi-frequency stripe structured light. The method is characterized by comprising the following steps of 1, generatingmulti-frequency coded stripe images; 2, conducting camera calibration; 3, conducting projector calibration; 4, projecting the coded stripe images and calculating an absolute phase of a stripe image the frequency of which is fn; 5, conducting three-dimensional reconstruction measurement. According to the method, applied equipment is simple, the cost is low, and precise three-dimensional measurement can be carried out on the surfaces of large objects complex in profile and drastic in transition.

Phase shifting optical projection three-dimensional measuring system and method

Abstract: The invention relates to a phase shifting optical projection three-dimensional measuring system and method. A laser is generated by a single-mode laser device and is expanded into light beams through an optical beam expanding system. The light beams pass through a one-dimensional beam splitting grating and forms two light beams. The two light beams pass through an acousto-optic modulator and generate Bragg diffraction and are projected to a beam-combiner after angles are adjusted to form an interference light path. The interference light path passes through a focusing lens and is amplified by a projection object lens. Interference fringes are generated and projected to a measured object. The interference fringes projected on a surface of the measured object are captured by a CCD camera. The interference fringes are processed by a computer and finally a three-dimensional morphology of the measured object is recovered. The system combines an acousto-optic modulation technology with a phase shifting fringe frequency conversion technology, fast measures the three dimensional morphologies of the surfaces of the multiple objects with different structures on-machine, has the strong vibration resistance capability, realizes the on-machine measurement in a processing process, and especially has strong robustness for the object surface with the complex structure.

Structured light lighting device and method of producing striped structured light

Abstract: The invention provides a structured light lighting device and a method of producing striped structured light. The structured light lighting device includes a laser, a half-wave plate, a condenser lens, a beam splitter, a reflector, an optical length delay module, and a Dove prism and a half-wave plate which are rotationally arranged in an optical path. Linearly polarized light emitted by the laser passes through the half-wave plate and the condenser lens in sequence, and is then split by the beam splitter into a reflected beam and a transmitted beam. The reflected beam enters the optical length delay module. The transmitted beam is reflected by the reflector to the optical length delay module. After the reflected beam and the transmitted beam pass through the optical length delay module, two lighting beams with the same optical length are formed. After the two lighting beams pass through the Dove prism and the half-wave plate, two spots are generated in a plane P1. A method of producing striped structured light is further provided. With the structured light lighting device adopted, problems such as low energy utilization rate, small lighting field of view and difficult polarization modulation in the prior art are solved.

Surface measurement method and surface measurement device

Abstract: The invention relates to a surface measurement method and a surface measurement device. The surface measurement method includes the steps following steps that: a surface to be measured is provided; the interference fringes of a local region of the surface to be measured are acquired and horizontally enlarged; and the surface height of the surface to be measured is obtained according to the horizontally-enlarged interference fringes of the local region of the surface to be measured. According to the surface measurement method, the local region is measured to characterize an overall condition under a premise that the frequency of the light source of the surface measurement device and the measuring mechanism of the surface measurement device are not changed, the number of measuring points cansatisfy the requirements of the Nyquist frequency of the local region, and therefore, the surface characteristics of a surface with large variations in surface height can be truly and accurately reflected. The surface measurement method can truly and accurately reflect the surface characteristics of a 2D cover plate and a 3D cover plate having large variations in surface height.

Fan-shaped strip based mirror plane defect detection system and method

Abstract: The invention provides a fan-shaped strip based mirror plane defect detection system and method. The system includes strip projection equipment, an image acquisition device and a control module. The control module controls the strip projection equipment to project fan-shaped strips to a to-be-detected object. The image acquisition device is used for receiving a fan-shaped strip image reflected from the to-be-detected object and transmitting the acquired fan-shaped stirp image to the control module in a form of an image signal. The control module controls the strip projection equipment to output the fan-shaped strips by coding, decodes the fan-shaped strips acquired by the image acquisition device, solves a fan-shaped strip modulation degree by using data after decoding the fan-shaped strip image to obtain a gray-scale distribution map, and compares the data after decoding the gray-scale distribution map with the coded fan-shaped strip before output to obtain a modulation degree diagram and a defect display diagram that can observe defects.