Quantitative analysis of holographic particle data

• Published in: Optics and lasers in engineering 1993, Vol.18 (4), p.267-279
• Main Authors: Bryanston-Cross, P.J., Quan, C., Funes-Gallanzi, M., Judge, T.R.
• Format: Article
• Language: English
• Subjects: Exact sciences and technology; Fundamental areas of phenomenology (including applications); Holographic interferometry; other holographic techniques; Holography; Optics; Physics
• ISSN: 0143-8166; 1873-0302
• DOI: 10.1016/0143-8166(93)90055-P

There are several well known difficulties in forming and analysing holographic particle data in the micrometre and submicrometre size range. This paper suggests that these problems can be overcome by using a combination of research techniques. Firstly, it has been found that it is possible to record images of submicrometre particles by using conventional photographic materials. Essentially, a diffraction limited optical component has been used to provide aberration free particle images. Secondly, the sensitivity of the holographic material has been increased with the use of specialized holographic processing chemicals. Thirdly, it has been found that it is possible to encode holographically double, slightly displaced, particle images by using a pulse laser. Thus, Young's fringes can be obtained directly from the stored holographic data, and the particle velocity can be measured directly from the hologram. Fourthly, the holographic particle data can be automatically analysed, using a software program. Finally since the data is stored holographically, it is possible to obtain instantaneous 3-D particle velocities. This paper demonstrates that it is possible to perform holographic particle image velocimetry automatically, with only a small amount of preprocessing.