2019 Laser Holography Technology

Abstract: The current application of laser holography in some scientific as well as industrial fields were introduced. Some strong points and problems existing in the related fields were analyzed. The development trend of laser holography in certain subjects was discussed. That new technology integration, laser holography will be found for more and more application was em-phasized.

Since the invention of laser holography, the application field and scope of laser holography technology have been expanding, and the influence on related technologies and industries is increasing. Especially in recent years, with the comprehensive application of laser holography technology and other discipline technologies, laser holography technology It also shows its huge application prospects. Based on this, a comprehensive research and discussion on the application and development trend of laser holography technology is carried out to promote the continuous application of laser holography technology and the continuous improvement of application level. This is to promote the development of laser holography theory and technology. 

A typical transient laser holographic interferometric measurement test equipment newly developed and developed in recent years: (1) YSC1 type moving particle transient laser holography tester for testing the atomization characteristics of rocket engine nozzles; (2) SPQ_1 type quadrant picosecond ultraviolet laser holographic detector for laser thermonuclear fusion dense plasma electron density measurement; (3) Transient laser holographic interferometry measurement system including recording, reproduction and image processing; (4) A laser holographic grating precision test system for displacement detection of diaphragms commonly used in aviation, aerospace, petrochemical and other sectors.

Continuous improvement of laser holographic interferometry

(1) Since 2002, researchers represented by Professor Cai Yunliang of Nanjing University of Aeronautics and Astronautics have systematically studied various factors affecting measurement results in 3D displacement measurement, and proposed a set of analysis and solutions, and have begun to apply. In related fields. They also conducted a large number of studies on the measurement of displacement, deformation and stress analysis, and vibration analysis, both measuring the magnitude of displacement or deformation, and measuring the direction of displacement vector, which is currently in the near-application phase. (2) Laser holographic interferometry When measuring the image of interference fringes, uneven background noise often occurs, and the image is sometimes blurred. In the past two years, with the development of computer digital image processing technology of laser holographic interference fringes, it has been able to greatly eliminate uneven background noise, enhance image contrast, and refine holographic interference fringes to obtain clear interference fringe patterns. The purpose of accurate quantitative measurement. The transient laser holographic interferometry technology has a time resolution of ns, ps, and fs, with a spectral range from near-infrared to ultraviolet. As the spatial resolution of photoelectric image sensors increases, the replacement of holographic dry plates with large aperture array CCD targets will soon become a reality. At present, the United States and Germany have developed laser holographic interferometric measuring devices from bacterial recording media. With advances in semiconductor laser technology, miniaturization of pulsed solid-state lasers has become possible. Smaller, portable transient laser holographic metrology test equipment will play a greater role in research, defense, and the national economy.