Molded, wafer level optics for long wave infra-red applications

2016 ◽  
Author(s):  
John Franks
Keyword(s):  
Wafer Level ◽  
Long Wave ◽  
Infra Red

Iceberg Detection in Low Visibility Conditions via Infra-Red Sensors: Processing and Modelling of Field Data

2017 ◽  
Author(s):  
Grégory Bouquet ◽  
Helene Schulerud ◽  
Francesco Scibilia
Keyword(s):  
Optical Properties ◽  
Numerical Modelling ◽  
Field Data ◽  
Radiation Transfer ◽  
Short Wave ◽  
Long Wave ◽  
Infra Red ◽  
Low Visibility ◽  
Imaging Sensors ◽  
Modelling Study

This article deals with Short Wave Infra-Red (SWIR) and Long Wave Infra-Red (LWIR) imaging sensors for detecting icebergs in harsh metocean conditions. Field data acquired during the Statoil Offshore Newfoundland Research Expedition 2015 (ONRE15) is analyzed. The analysis is supported by a numerical modelling study which aims at simulating the optical properties of ice and water combined with the radiation transfer in the Infra Red.

scholarly journals Infra-red Radiation and Nasal Obstruction

1935 ◽  
Vol 35 (2) ◽  
pp. 185-198 ◽  
Author(s):  
H. A. E. van Dishoeck
Keyword(s):  
Nasal Obstruction ◽  
Short Wave ◽  
Nasal Passage ◽  
Surface Cooling ◽  
Local Overheating ◽  
Long Wave ◽  
Infra Red ◽  
The Hill ◽  
Red Radiation ◽  
Selection Of

For the investigation of the Hill phenomenon, viz. the antagonism of short-and long-wave infra-red radiation in their influence on nasal obstruction, the commonly used rhinomanometric technique is not well suited. In this paper a new procedure is described, in which an air current is blown through the nose. In this way the nasal passability may be estimated, independent of respiratory movements. It proved to be desirable to make a selection of suitable experimental subjects with the aid of adrenaline and histamine tests; only those persons in which the opening by adrenaline and the narrowing by histamine sprays were clearly demonstrable were chosen.Long-wave infra-red rays constantly caused nasal obstruction.The shorter waves were much weaker in their shutting effect, and also decreased the narrowing of the nose when they were given in combination with the long-wave rays of an electric fire.A nasal passage closed by long-wave infra-red radiation may be partly opened by the short-wave rays; the possibility of surface cooling being the opening factor was excluded.Artificial cooling of the skin has a very marked opening influence.It is suggested that nose-opening and nose-shutting are correlated with cooling and heating of the Malpighian layer. Long infra-red rays will be completely absorbed in the layer and cause capillary stasis with local overheating. The shorter waves for the greater part penetrate more deeply; the skin reacts by an active hyperaemia, which, by relatively cooling the overheated Malpighian layer, has the same effect as a cooling from without.

scholarly journals The emission constants of metals in the near infra-red

1933 ◽  
Vol 142 (847) ◽  
pp. 466-490 ◽  
Keyword(s):  
Cross Section ◽  
Specific Resistance ◽  
Wave Length ◽  
Electromagnetic Theory ◽  
Absolute Temperature ◽  
Restricted Range ◽  
Electron Theory ◽  
Long Wave ◽  
Infra Red ◽  
Made In

In the far infra-red, the reflecting power, R, of a metal at a wave-length, λ, is connected with its specific resistance, ρ, by the Hagen-Rubens relation, 1 - R = k √ρ/λ, where k is a constant with the value 0·365 when λ is measured in μ., and ρ is the resistance of a rod of the metal 1 metre in length and 1 sq. mm. in cross-section. The relation has only a restricted range of validity: for it is based theoretically on the electromagnetic theory, which does not embody the modern conceptions of the electron theory; and a restriction for a lower wave-length limit is made in the deduction of the formula itself. Hagen and Rubens have subjected the formula to a rigid test by a series of emission measurements. At wave-lengths of 25·5 and 8·85 μ, the calculated and observed emissivities agreed usually to within about 10%. Further experiments at the same wave-lengths showed, moreover, that the emissivity changed with temperature in the manner demanded by the relation. It follows that the emissivity of a metal at sufficiently long wave-lengths is roughly proportional to the square-root of its absolute temperature.

The Long-Wave Limit of Infra-Red Photoconductivity in PbSe

1951 ◽  
Vol 64 (11) ◽  
pp. 1054-1055 ◽  
Author(s):  
A F Gibson ◽  
W D Lawson ◽  
T S Moss
Keyword(s):  
Long Wave ◽  
Infra Red ◽  
Wave Limit

scholarly journals The Further Effects of Irradiation on the Oestrous Cycle of the Ferret

1936 ◽  
Vol 13 (4) ◽  
pp. 383-386
Author(s):  
F. H. A. MARSHALL ◽  
F. P. BOWDEN
Keyword(s):  
Ultra Violet ◽  
Oestrous Cycle ◽  
The Other ◽  
Violet Light ◽  
Long Wave ◽  
Infra Red ◽  
Long Time ◽  
To Come ◽  
Incandescent Lamps ◽  
Effects Of Irradiation On

The investigation of the effect of radiation on the oestrous cycle of the female ferret has been continued. (1) The earlier experiments with the ultra-violet light have been repeated and confirmed. Irradiation with light of λ 3650Å. caused the ferrets to come on heat early and to remain on heat for an abnormally long time after irradiation had ceased. (2) Heat rays of long wave-lengths caused no acceleration. This is in accordance with earlier experiments which showed that heat rays and infra-red (λ 7500Å.) had little effect. (3) Two pairs of ferrets were subjected to the same total quantity of radiation from incandescent lamps, but in one case it was concentrated into 2 hours, and in the other spread over 16 hours. There was little difference in the behaviour of the two pairs and both showed an acceleration of oestrus.

scholarly journals JOINT GEOMETRIC CALIBRATION OF COLOR AND THERMAL CAMERAS FOR SYNCHRONIZED MULTIMODAL DATASET CREATING

2019 ◽  
Vol XLII-2/W18 ◽  
pp. 79-84 ◽  
Author(s):  
V. A. Knyaz ◽  
P. V. Moshkantsev
Keyword(s):  
Computer Vision ◽  
Parameters Estimation ◽  
Industrial Control ◽  
Geometric Calibration ◽  
Long Wave ◽  
Infra Red ◽  
Thermal Cameras ◽  
Thermal Vision ◽  
Model Training ◽  
And Robotics

Abstract. With increasing performance and availability of thermal cameras the number of applications using them in various purposes grows noticeable. Nowadays thermal vision is widely used in industrial control and monitoring, thermal mapping of industrial areas, surveillance and robotics which output huge amount of thermal images. This circumstance creates the necessary basis for applying deep learning which demonstrates the state-of-the-art performance for the most complicated computer vision tasks. Using different modalities for scene analysis allows to outperform results of mono-modal processing, but in case of machine learning it requires synchronized annotated multimodal dataset. The prerequisite condition for such dataset creating is geometric calibration of sensors used for image acquisition. So the purpose of the performed study was to develop a technique for joint calibration of color and long wave infra-red cameras which are to be used for collecting multimodal dataset needed for the tasks of computer vision algorithms developing and evaluating.The paper presents the techniques for camera parameters estimation and experimental evaluation of interior orientation of color and long wave infra-red cameras for further exploiting in datasets collecting. Also the results of geometrically calibrated camera exploiting for 3D reconstruction and 3D model realistic texturing based on visible and thermal imagery are presented. They proved the effectivity of the developed techniques for collecting and augmenting synchronized multimodal imagery dataset for convolutional neural networks model training and evaluating.

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