Review of night vision technology

Chrzanowski, Krzysztof

doi:10.2478/s11772-013-0089-3

Cited by 82 publications

(35 citation statements)

References 7 publications

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“…This fact allows to use more powerful lasers without violation of eye−safety regulations, which in consequence has a positive impact on maximum achievable range. Some military aspects of range−finders classification come from potential enemy observation capabilities [10] -0.9 μm radiation is visible by most even obsolete night− −vision systems (in case of 1.5 μm it is not so) and that's why some users may prefer 1.5 μm, simply because they do not want to reveal their positions during measurements. There are also other factors like dimensions, components price, overall efficiency, spectral detectivity, etc.…”

Section: Discussionmentioning

confidence: 99%

Comparison of 905 nm and 1550 nm semiconductor laser rangefinders’ performance deterioration due to adverse environmental conditions

Wojtanowski

Zygmunt

Kaszczuk

et al. 2014

Opto-Electronics Review

105

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Laser rangefinder performance (i.e., maximum range) is strongly affected by environment due to visibility-dependent laser attenuation in the atmosphere and target reflectivity variations induced by surface condition changes (dry vs. wet). Both factors have their unique spectral features which means that rangefinders operating at different wavelengths are affected by specific environmental changes in a different way. Current state of the art TOF (time of flight) semiconductor laser rangefinders are based mainly on two wavelengths: 905 nm and 1550 nm, which results from atmospheric transmission windows and availability of high power pulsed sources. The paper discusses the scope of maximum range degradation of hypothetical 0.9 μm and 1.5 μm rangefinders due to selected water-related environmental effects. Atmospheric extinction spectra were adapted from Standard Atmosphere Model and reflectance fingerprints of various materials have been measured. It is not the aim of the paper to determine in general which wavelength is superior for laser range finding, since a number of criteria could be considered, but to verify their susceptibility to adverse environmental conditions.

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Section: Discussionmentioning

confidence: 99%

Comparison of 905 nm and 1550 nm semiconductor laser rangefinders’ performance deterioration due to adverse environmental conditions

Wojtanowski

Zygmunt

Kaszczuk

et al. 2014

Opto-Electronics Review

105

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“…Because we employed the intensifier as a collection/amplification device in both FD and CW measurements, we can directly attribute added cost of improved image reconstruction using FD measurements as the amount of time required for data acquisition, an important consideration for small animal imaging. Strategies for significantly reducing data acquisition times can include a combination of using a multiplicity of detectors/sources, excitation illumination patterns [58]- [60], deployment of emerging filmless Gen III intensifier technology [61] as well as improving the read-out rate of the frame transfer, 16-bit CCD.…”

Section: A Evaluation Of Fd Versus Cw Measurements For Recovery Ofmentioning

confidence: 99%

Experimental Comparison of Continuous-Wave and Frequency-Domain Fluorescence Tomography in a Commercial Multi-Modal Scanner

Darne

Tan

et al. 2015

IEEE Trans. Med. Imaging

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The performance evaluation of a variety of small animal tomography measurement approaches and algorithms for recovery of fluorescent absorption cross section has not been conducted. Herein, we employed an intensified CCD system installed in a commercial small animal CT (Computed Tomography) scanner to compare image reconstructions from time-independent, continuous wave (CW) measurements and from time-dependent, frequency domain (FD) measurements in a series of physical phantoms specifically designed for evaluation. Comparisons were performed as a function of (1) number of projections, (2) the level of preprocessing filters used to improve the signal-to-noise ratio (SNR), (3) endogenous heterogeneity of optical properties, as well as in the cases of (4) two fluorescent targets and (5) a mouse-shaped phantom. Assessment of quantitative recovery of fluorescence absorption cross section was performed using a fully parallel, regularization-free, linear reconstruction algorithm with diffusion approximation (DA) and high order simplified spherical harmonics ( SPN) approximation to the radiative transport equation (RTE). The results show that while FD measurements may result in superior image reconstructions over CW measurements, data acquisition times are significantly longer, necessitating further development of multiple detector/source configurations, improved data read-out rates, and detector technology. FD measurements with SP3 reconstructions enabled better quantitative recovery of fluorescent target strength, but required increased computational expense. Despite the developed parallel reconstruction framework being able to achieve more than 60 times speed increase over sequential implementation, further development in faster parallel acceleration strategies for near-real time and real-time image recovery and more precise forward solution is necessary.

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“…Improvements of night vision technology during last several decades are impressive [1]. Importance of this technology for defence and security sector could suggest that metrolo− gical situation in area of night vision technology should be very good.…”

Section: Night Vision Devicesmentioning

confidence: 99%

“…5 [34] are exagger− ated but still spectral sensitivity of NVDs containing Gen 2/Gen 2+ tubes differ significantly from spectral sensitivity of NVDs built using Gen 3 tubes. Left target: Vertical/Horizontal limit boxes Right target: bright cross on dark background 1 Relative to NIST standards maintained by Hoffman Engineering Calibration Laboratory. 2 IR source provides radiance equivalent to the footlambert level specified for 2856 Kelvin white light.…”

Section: Led Light Sourcesmentioning

confidence: 99%

Review of night vision metrology

Chrzanowski

2015

Opto-Electronics Review

Self Cite

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A review of night vision metrology is presented in this paper. A set of reasons that create a rather chaotic metrologic situation on night vision market is presented. It is shown that there has been made a little progress in night vision metrology during last decades in spite of a big progress in night vision technology at the same period of time. It is concluded that such a big discrep- ancy between metrology development level and technology development can be an obstacle in the further development of night vision technology.

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Review of night vision technology

Cited by 82 publications

References 7 publications

Comparison of 905 nm and 1550 nm semiconductor laser rangefinders’ performance deterioration due to adverse environmental conditions

Comparison of 905 nm and 1550 nm semiconductor laser rangefinders’ performance deterioration due to adverse environmental conditions

Experimental Comparison of Continuous-Wave and Frequency-Domain Fluorescence Tomography in a Commercial Multi-Modal Scanner

Review of night vision metrology

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