This paper introduces a internal flaws detected system. The internal flaws of metal tube or internal hole of mechanical device, such as crazing, rust-eaten and dropping of electroplated coating. By using xenon-light as a light source through the fiber bundle, the internal surface of tube is illuminated and imaged on the CCD optical receiver by endoscope, Then the direction and the size of the flaws are measured after processed by the imaging grab section and computer processing system. This system also can detect the pose water pipe of the aircrafts, the firebox of the aero engine, turbine and lamina which can not be viewed and detected nearly by human eye. It can measure their redundancy and size of internal flaws.
This paper introduces one on-line measuring system of the metal surface roughness. The system is based on the theory about light's diffusing of the metal surface. Laser is used as the lamp-house of measure and in the system detector collects the light's signals by optical fiber. The surface roughness measuring principle and method are presented and the experiment data are analyzed. After comparing with other approaches, the standard-sample-plate comparison is adopted. The method is simple in structure and high in efficiency and the one-by-one measuring points can reflect the real surface. As for all the factors can induce errors in on-line measuring, the research obtains good result by revising the errors with reparative formula.
With the development of the minimally invasive surgeries (MIS), the quality of information provided to surgeons becomes more and more important. Consequently it has been a trend that stereoscope replaces the traditional monocular endoscopes. This 3D video endoscope system acquires separate left and right images by a pair of stereo-objective lenses replicating human binocular vision. The system employs time multiplexing technique accomplished by images processor. The separate left and right images will been seen with an active matrix liquid crystal screen and a circular polarized eyewear at different moments at the same time. The clinical evaluation shows that when the system is adopted to perform the MIS, the procedure is safer, more effective, and less invasive.
This paper introduces a non-contact measuring system —measuring thread system using laser fiber sensor. It can solve some problems of the traditional measuring methods, such as complicated technical process, long re-testing periods, waste workpiece. A low noise amplifier used to match the photo-electronic detecting element due to the weak signal is applied in this system. Furthermore, it presents a new measuring system with phase-sensitive detecting circuit controlled by computer program, an interface circuit of microcomputer, laser fiber sensor system and digital processing system, the system based on the above elements has high resolution and sensitivity, the measuring errors ?20 ?m.
By using light as a carrier, the information of voice and data is sent to a receiver through atmosphere, so this system with computer via some interfaces can be applied to link computers into network. This system has shown many advantages on volume weight flexibility, convenience, security and anti- interference. In this paper, firstly, the principle of a laser communication system is introduced, then the performance of LOC, GaAs, AlGaAs semiconductor lasers are presented; moreover, the basis of choosing photo-detector, the characteristic and usage of silicon avalanche photo-detectors, and the threshold detection and false-alarm ratio of the system are presented in detail.
This paper introduces a photoelectric detection system, i.e. the internal surface of the metal tube illuminated by Xenon light through fiber bundle, is imaged on CCD optical receiver by endoscope. The image can be converted to video frequency signal, then this signal can be converted to digital signal by a sampling control system, which processed by a computer. SO the measurement system can clearly display the surface flaws of workspace of complicated construction, and quantitatively measure sorts of flaws by an image processing system.
The combined use of the photoelectric and electron-optic properties of BSO crystal leads to realize spatia light modulation. Under some condition BSO crystal can become birefringent depending on a local illuminance. The relationship between the distributions of illuminance and birefringence will be discussed. This spatial light modulator can work in real-time, which converts illuminance into transparence. The experiment shows, in order to increase the sensitivity of BSO crystal, an electric field 6 kv/cm at an atmosphere pressure 15 X 105 Pa should be applied to BSO crystal. With BSO crystal we have measured 3D deformation by means of real-time holography.