Theory And Application Technology Of Data Visualization For Optoelectronic Measurement

With the rapidly progress of modern optoelectronic measurement and computer technology, optoelectronic measurement are playing a more and more important role in the science research, military and industry fields. Especially, the scientific visualization technology has gradually evolved and grown up from the computer graphics. The data visualization of optoelectronic measurement has become to the significant proof and means of science research. On the other hand, the higher software and hardware requirement of data visualization technology for the huge data set in actual application has been presented.The mostly technical parameter of the detector of an optoelectronic measurement system was introduced in detail, and the design of low noise pre-amplifier and its characteristic of frequency and noises were analyzed. Then, the principle of lock-in amplifier and the implement of analog lock-in amplifier were narrated, which using widely in weak signal detection. Moreover, the digital signal processing in optoelectronic measurement, included non-recursive digital filtering and recursive digital filtering was discussed.The three dimension visualization based on surface rendering was expatiated. The principle and implement of the classical algorithm - MC (Marching Cubes) were analyzed, and the problem and resolving of the ambiguity of MC were discussed were analyzed. Furthermore, the OpenGL (Open Graphics Library) was introduced, which is a standard specification defining a cross-language cross-platform API for writing applications that produce 2D and 3D computer graphics. Then, the surface rendering display technology based on OpenGL was discussed, which includes model rendering, coordinate transform and so on. A Geometry Compression algorithm based on Loop subdivision mesh was proposed to compress the data of 3D models, so that it can be decreased the requirement of disk space and network for save or transmit the 3D models.After studied the theory and method of shaft alignment, a new high precision rotatory laser shaft alignment method based on laser measurement technology and data visualization technology was presented, and the software and hardware design and implement of the prototype was described in detail. A receiver with dual PSD was designed to a particular structure. It not only resolved the problem of the alignment between the LD beam and PSD, but also improved the precision of the system. The system calculated the shaft disalignment and the adjust value of the machine feet by four point measure method. The measurement result of the prototype and its error were analyzed, so that proved the correctness of the method, and gived the resolution and measuring uncertainty of the prototype system.A Mirau phase-shifting interferometer for the profile measurement of microlenses array was discussed. The light source of the interferometer system was a He-Ne Laser. The interference image system consisted of a Mirau interference objective and other optical elements. A piezoelectric transducer (PZT) was used for the phase shifter. The profile of microlenses array was obtained with interferograms by five-step phase-shifting algorithm. According to the feature of the profile of microlenses array, the whole array was divided into many micro parts. Then, the profiles of each part can be acquired by the Mirau phase-shifting interferometer method with the precise motion unit. Finally, the accurate profile of the whole microlenses array was gained by using the data splice and 3D reconstruction technology.A method was brought forward for evaluating laser spot quality based pseudo-color processing. For human eyes, the distinguish ability to color images is far larger than it to gray images. So the gray image can be transformed to the color image by pseudo-color processing that enhanced the discrimination in the image detail. Accordingly, the energy distribution of laser spot can be clearly represented. After discussed the principle of pseudo-color transform and pseudo-color coding, an evaluating system for laser spot quality based pseudo-color processing was proposed. The system employed a CCD (charge-coupled device) as detector, and transformed the electronic image signal from CCD to the digital image by image capture card, and displayed 2D/3D distribution diagram, 1D distribution curve and other parameters of the cross section of laser beam by using the laser spot analysis software.