2.7 - Underwater optical range gating

Heckman, P.; Hodgson, R. T.

doi:10.1109/jqe.1967.1074390

Cited by 38 publications

(20 citation statements)

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“…Examples of range gated applications for marine environments include identification of small surface vessels 81, 82, 83 and divers. Gated viewing for underwater imaging was tested since a long time 84,85,86 and also recently using range gating with sub-centimeter accuracy 87 . Scanning systems were studied for the detection of underwater objects in front of ships 88 .…”

Section: Spatially Resolved Vibration Imagingmentioning

confidence: 99%

Laser radar: from early history to new trends

Molebny

Kamerman²,

Steinvall

2010

SPIE Proceedings

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The first steps of laser radar are discussed with the examples from range finding and designation. The followed successes in field tests and further fast development provided their wide use. Coherent laser radar, developed almost simultaneously, tried the ideas from microwaves including chirp technology for pulse compression, and Doppler mode of operation. This latter found a unique implementation in a cruise missile. In many applications, environmental studies very strongly rely upon the lidars sensing the wind, temperature, constituents, optical parameters. Lidars are used in the atmosphere and in the sea water measurements. Imaging and mapping is an important role prescribed to ladars. One of the prospective trends in laser radar development is incorporation of range and velocity data into the image information. Deep space program, even having not come to the finish, gave a lot for 3D imaging. Gated imaging, as one of the 3D techniques, demonstrated its prospects (seeing through scattering layers) for military and security usage. Synthetic aperture laser radar, which had a long incubation period, started to show first results, at least in modeling. Coherent laser radar baptized as the optical coherence tomography, along with the position sensitive laser radar, synthetic aperture laser radar, multispectral laser radar demonstrated very pragmatic results in the micro-scale applications.

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Section: Spatially Resolved Vibration Imagingmentioning

confidence: 99%

Laser radar: from early history to new trends

Molebny

Kamerman²,

Steinvall

2010

SPIE Proceedings

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“…The absorption effect reduces the signal strength, and the scattering effect reduces both signal strength and image resolution[1] [2]. Thanks to the development of coherent light sources and optoelectronics, the range gate imaging system was put forward and tested to mitigate those problems in underwater entironment since 1967 [3].…”

Section: Underwater Imaging Protorype Systemmentioning

confidence: 99%

Performance evaluation of underwater range-gated viewing based on image quality metric

Han

Zhang

2009

2009 9th International Conference on Electronic Measurement &Amp; Instruments

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A underwater imaging prototype system is built based on range gate mechanism. The no-reference image quality metric which is the sum of weight information capacity based on co-occurrence matrix of different direction is proposed in this paper in order to study the system performance according to different parameters. The tank trail is processed. In the first stage the metric is proved to be consistent with human visual. And then it is concluded that the metric will arise by improving the laser power and ICCD gain until to a top and then drop followed. At last the results also show that defering the gate time and prolonging the duration is helpful in terms of image quality as long as the CCD is not saturation.

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“…One way to mitigate this problem is to use a range-gated system. Gated viewing for underwater imaging have been tested since a long time ago 25,26,27 and also recently using range gating with sub-cm accuracy 28 . At FOI range gating for underwater applications was studied during the seventies but as with the corresponding application in air the technology and processing capabilities were too limited to allow for compact practical system.…”

Section: Underwater Imagingmentioning

confidence: 99%