optical depth


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optical depth

Symbol: τ. A measure of the absorption of radiation of a particular wavelength as it passes through a gaseous medium. If the initial radiation flux Φ0 is reduced to Φx after a distance x through the medium then
Φx0 = exp(–τ)
where τ is the optical depth for the radiation wavelength. If τ equals zero the medium is transparent; if τ is much greater or much less than one the medium is optically thick or optically thin respectively. See also opacity.

optical depth

[′äp·tə·kəl ′depth]
(meteorology)
References in periodicals archive ?
The coated surfaces are characterized by high brilliance, optical depth and a wide variety of amazing color effects.
The coated surfaces are characterised by high brilliance, optical depth and a wide variety of amazing colour effects.
The use of optical depth sensors in the Microsoft Kinect, and more recently in mobile phones, has catalysed a rapid acceleration in innovation, resulting in depth sensors that are tiny, inexpensive and energy-efficient.
His paper, "Aerosol Size Distributions Obtained by Inversion of Spectral Optical Depth Measurements," has been cited more than 500 times, as have two of his papers on the use of global positioning system (GPS) satellite measurements to determine atmospheric water vapor profiles.
The Metallic powder coatings, which are predominantly used in architectural applications for the coating of exterior and interior furniture as well as for lighting fixtures, impress with their outstanding brilliance, optical depth and fascinating colour effects in changing light conditions.
Aerosols include S[O.sub.2] (ppm), PM10 ([micro]g/[m.sup.3]), [O.sub.3] (ppm), N[O.sub.2] (ppm), CO (ppm), and AOD (aerosol optical depth).
In the second session--Materials and Production Development--Neha Agarwal from Sectago outlined AgiLite[TM], a new OVD feature for document protection that exhibits continuous motion, optical depth (3D effect) with a bright white appearance.
Placed deep inside quarries, as the title suggests, the bells are modeled and lit in such a way as to fully bring out their reflective surface effects, either absorbing their backgrounds or, by contrast, denying optical depth and information.
The model requires entry data, such as aerosol optical depth (AOD) at 500 nm, ozone concentration, latitude, longitude, and precipitable water.
The MAIAC (Multi-Angle Implementation of Atmospheric Correction) data product derived from MODIS (Moderate Resolution Imaging Spectroradiometer) aerosol optical depth measurements allows for estimation of [PM.sub.2.5] at 1-[km.sup.2] spatial resolution (Lyapustin et al.

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