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Spectral reflectance measure a thin film's characteristics by reflecting light off the film and analyzing the resulting reflectance spectrum over a range of wavelengths. Light reflected from different interfaces of the film can be in- or out-of-phase so these reflections add or subtract, depending upon the wavelength of the light and the film's thickness and index. The result is intensity oscillations in the reflectance spectrum that are characteristic of the film.
To determine the film's thickness, the software calculates a theoretical reflectance spectrum that matches as closely as possible to the measured spectrum. It begins with an initial guess for what the reflectance spectrum should look like, based on the nominal film stack. This includes information on the thickness and the refractive index of the different layers and the substrate that make up the sample. The theoretical reflectance spectrum is then adjusted by adjusting the film's properties until a best fit to the measured spectrum is found.
This metrology can be used on thin film thickness measurement, even for transparent films.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoa specified material over several wavelengths will reflect from electromagnetic radiation.
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Does Every element and compound in nature have a unique set of spectral lines?
Elements have several spectral lines and although some lines may be the same between different elements most lines are not and the whole spectrum for each element is indeed unique.
What is Vega spectral class?
The spectral class is A0Va.
What is the spectral class of Antares?
Antares has a spectral class of M1LB.
When was Spectral Mornings created?
Spectral Mornings was created in 1979-01.
Is spectral type k hotter then spectral type a?
No. K spectral type stars (which are orange) temperature is ranging from 5,000-3,500. A spectral type stars (which are blue-white) temperature is ranging from 7,500-11,000.
What are reflectance curves?
Reflectance curves show the reflectivity as a function of wavelengt.
What is the definition of reflectance curves?
The percent of energy that is reflected off a surface and back to a sensor.
What has the author Nikolaus Dietz written?
Nikolaus Dietz has written: 'P-polarized reflectance spectroscopy' -- subject(s): Laser applications, Fine structure, Light scattering, Dielectric properties, Spectral reflectance, Epitaxy, Film thickness, Spectroscopy, Surface layers
What about spectral signature of urban area?
The spectral signature of urban areas typically includes high reflectance in visible bands due to man-made materials like concrete and asphalt, low reflectance in near-infrared bands due to lack of vegetation, and often higher temperatures in thermal bands due to heat absorption and retention by buildings and roads. Additionally, urban areas may exhibit unique spectral signatures in shorter wavelengths due to specific materials or surface properties.
What has the author Jim G Field written?
Jim G. Field has written: 'Irrigation scheduling by sensing thermal emittance and spectral reflectance' -- subject(s): Irrigation scheduling
Where can pascal's triangle be seen in the nature and daily life?
it can be seen in nature in the curves of string instruments
What are the spectral approaches to molecules of natural origin?
Spectral approaches are ways of isolating molecules. Molecules of natural origin are those that are found in nature and have not been modified.
What is the difference between radiance and reflectance?
Radiance is the variable directly measured by remote sensing instruments. Basically, you can think of radiance as how much light the instrument "sees" from the object being observed. When looking through an atmosphere, some light scattered by the atmosphere will be seen by the instrument and included in the observed radiance of the target. An atmosphere will also absorb light, which will decrease the observed radiance. Radiance has units of watt/steradian/square meter. Reflectance is the ratio of the amount of light leaving a target to the amount of light striking the target. It has no units. If all of the light leaving the target is intercepted for the measurement of reflectance, the result is called "hemispherical reflectance." Reflectance (or more specifically hemispherical reflectance) is a property of the material being observed. Radiance, on the other hand, depends on the illumination (both its intensity and direction), the orientation and position of the target and the path of the light through the atmosphere. With effort, many of the atmospheric effects and the solar illumination can be compensated for in digital remote sensing data. This yields something which is called "apparent reflectance," and it differs from true reflectance in that shadows and directional effects on reflectance have not been dealt with. Many people refer to this (rather inaccurately) as "reflectance." For most of the vegetation indices in this FAQ, radiance, reflectance, and apparent reflectance can be used interchangeably. However, since reflectance is a property of the target material itself, you will get the most reliable (and repeatable) vegetation index values using reflectance. Apparent reflectance is adequate in many cases. See the related link.
How can a teenager get curves?
A teenager can't just get curves by doing something, you have to let nature do it's work and wait. be patient and before you know it you will full curves. Don't think they will be super noticeable right away it takes time
What is bafrdf?
Bidirectional Reflectance Distribution Function
What has the author Dennis K Clark written?
Dennis K. Clark has written: 'Marine optical characterizations' -- subject(s): Optical measurement, Polarization characteristics, Spectral reflectance, Buoys, Infrared imagery, Hawaii, Chesapeake Bay (US), Harbors, Water color, Remote sensing, Communication networks
What is the difference between reflection and reflectance?
as such there is no soecific difference..
