Mare´chal’s condition governed tolerable primary aberrations in Fraunhofer holography

Vikram, Chandra S.

doi:10.1117/1.601410

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…Latta calculated the third- [6] and fifth-order [7] aberrations that are present in four types of hologram geometry. Vikram investigated the effect of primary aberrations on resolution using both the Rayleigh quarter-wavelength rule [8] and the Marechal tolerance [9]. The light intensity distributions in image planes associated with the influences of hologram aberrations were investigated by Nowak et al [10] and Banyasz [11].…”

Section: Aberration Reduction By Refractive Index Compensationmentioning

confidence: 99%

Accurate three-dimensional metrology of underwater objects using replayed real images from in-line and off-axis holograms

Hobson¹,

Watson²

1999

Meas. Sci. Technol.

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In many fields of science and engineering it is important to obtain accurate high-resolution images of underwater objects and scenes to allow precision dimensional measurement and inspection. Optical holography enables true three-dimensional images, with a simultaneous high resolution and large depth of field, to be recorded. The technical challenges of recording such holograms, and their subsequent replay in the laboratory, is considerable as there are increased optical aberrations arising from the change in refractive index when an object recorded in water is replayed in air. Our detailed evaluation of these aberrations, and techniques for their compensation, are described. We have demonstrated a resolution of better than 10 µm using in-line holography and better than 100 µm using off-axis holography in laboratory simulations of underwater scenes. Volumes of water of 2.5 litres (in-line) and up to 100 litres (off-axis) have been recorded. An absolute coordinate accuracy of better than 1% for both in-line and off-axis holograms has been achieved. Results are presented on resolution and coordinate accuracy versus distance, replay wavelength, off-axis angle, and holographic plate misalignment. We discuss the concepts with reference to the design of an underwater holographic camera for the recording of marine organisms and the associated replay of the holograms.

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Section: Aberration Reduction By Refractive Index Compensationmentioning

confidence: 99%

Accurate three-dimensional metrology of underwater objects using replayed real images from in-line and off-axis holograms

Hobson¹,

Watson²

1999

Meas. Sci. Technol.

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The principles and practice of holographic recording of plankton

Hobson¹,

Watson²

2002

J. Opt. A: Pure Appl. Opt.

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Optical fiber strain sensor based on sandwiched long-period fiber gratings with a surface bonding layer

Chiang

2014

J. Micro/Nanolith. MEMS MOEMS

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Abstract. An optical fiber strain sensor based on sandwiched long-period fiber gratings (OFSS-SLPFG) with a surface bonding layer is proposed. The proposed OFSS-SLPFG is an etched optical fiber that is sandwiched between two thick photoresists with a periodic structure. To prevent the glue effect in the surface bonding process, where glue flows into the SLPFG structure, reducing the coupling strength, a surface bonding layer (thickness: 16 μm) is used as the base layer on the bottom of the OFSS-SLPFG. The OFSS-SLPFG is, therefore, more effective for use as a strain sensor. When external strain loading is applied, the resonant dip loss of the OFSS-SLPFG is reflected linearly. A bending strain calibration experiment is demonstrated by the four-point bending test. The results show an average linearity (R 2 ) of 0.980, with a sensitivity of 0.00788 dB∕με. This phenomenon suggests that the OFSS-SLPFG can be utilized as a sensitive strain transducer. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Mare´chal’s condition governed tolerable primary aberrations in Fraunhofer holography

Cited by 3 publications

References 20 publications

Accurate three-dimensional metrology of underwater objects using replayed real images from in-line and off-axis holograms

Accurate three-dimensional metrology of underwater objects using replayed real images from in-line and off-axis holograms

The principles and practice of holographic recording of plankton

Optical fiber strain sensor based on sandwiched long-period fiber gratings with a surface bonding layer

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