Reducing the aberrations of holographic images of underwater particles by using the off-axis scheme with normal incidence of object beam

Victor V. Dyomin, John Watson, Philip W. Benzie

Результат исследований: Материалы для книги/типы отчетовМатериалы для конференции

3 Цитирования (Scopus)

Аннотация

In this paper we describe a method of recording by combining back-illumination of in-line objects with an off-axis reference beam to produce low-aberration holograms. This is advantageous since at the reconstruction stage no extra means of compensation are required. Calculations have shown that the spherical aberration does not exceed 5% for objects from 100 to 200 μm at a wavelength of 0.532 μm, the longitudinal spherical aberration does not exceed 1%, and astigmatism does not exceed 1%. A series of holograms were recorded to confirm the above predictions. Two targets consisting of arrays of squares, triangles, hexagons, rectangles and circles with dimensions of 100 μm and 200 μm were fabricated on glass plates by photolithography. Holograms were recorded with the objects placed in air or in water at various distances. After processing, holograms were replayed at λ= 0.633 μm and at λ=0.542 μm. More than 100 images were compared with the original targets for shape, dimensions and evidence of aberrations. Corresponding particles sizes differ by no more than 10%. The above experiments allow us to conclude that use the off-axis scheme with normal incidence of object beam on holoplates can provide a reduction of aberrations without any additional compensation at reconstruction stage.

Язык оригиналаАнглийский
Название основной публикацииOCEANS 2007 - Europe
СостояниеОпубликовано - 28 ноя 2007
Опубликовано для внешнего пользованияДа
СобытиеOCEANS 2007 - Europe - Aberdeen, Scotland, Великобритания
Продолжительность: 18 июн 200721 июн 2007

Серия публикаций

НазваниеOCEANS 2007 - Europe

Конференция

КонференцияOCEANS 2007 - Europe
СтранаВеликобритания
ГородAberdeen, Scotland
Период18.6.0721.6.07

ASJC Scopus subject areas

  • Computer Science Applications
  • Oceanography
  • Ocean Engineering
  • Modelling and Simulation

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