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Topic: Filter optics

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  Filter (optics) - Wikipedia, the free encyclopedia
Coating-based filters are often referred to as dichroic, and can be used in devices such as a dichroic prism to separate a beam of light into different coloured components.
Neutral density (ND) filters have a constant attenuation across the range of visible wavelengths, and are used to reduce the intensity of light by reflecting or absorbing a portion of it.
Polarized filters are also used to view certain types of stereograms, so that each eye will see a distinct image from a single source.
en.wikipedia.org /wiki/Filter_(optics)   (799 words)

 filter (optics) - Hutchinson encyclopedia article about filter (optics)
In optics, a device that absorbs some parts of the visible spectrum and transmits others.
For example, a green filter will absorb or block all colours of the spectrum except green, which it allows to pass through.
A yellow filter absorbs only light at the blue and violet end of the spectrum, transmitting red, orange, green, and yellow light.
encyclopedia.farlex.com /filter+(optics)   (146 words)

 Dichroic filter - Wikipedia, the free encyclopedia
A dichroic filter or thin-film filter is a very-accurate color filter used to selectively pass light of a small range of colors while reflecting other colors.
Used in front of a light source, a dichroic filter produces light that is perceived by humans to be highly saturated (intense) in color.
Because unwanted wavelengths are reflected rather than absorbed, dichroic filters don't absorb much energy during operation and so don't become nearly as hot as the equivalent conventional filter (which attempts to absorb all energy except for that in the passband).
en.wikipedia.org /wiki/Dichroic_filter   (510 words)

 Infrared Filter Optics | Search optical - filters .com   (Site not responding. Last check: 2007-10-31)
Infrared filters for transmitting, absorbing reflection and blocking the IR, are manufactured in many degrees of specifications and tolerances in a wide selection of sizes.
Schott and Hoya infrared transmitting longpass and bandpass filters transmit from 695nm to 1 micron.
As with hot mirrors acting as heat protection filters blocking the path beam blocking the infrared by reflecting the IR radiation for use at 0º and 45º angle of incidence.
www.optical-filters.com /infrared.html   (234 words)

 Filter (optics)   (Site not responding. Last check: 2007-10-31)
Another kind of optical filter is a polarization filter, which blocks or transmits light according to its polarization.
Light from a clear blue sky is also polarized, and adjustable filters are used in color photography to darken the appearance of the sky without introducing colors to other objects, and to control specular reflection s from objects and water.
Optics for Kids Includes a section on careers in optics, vision and color, optics in nature, optics and laser lab, and biomedical and health applications.
www.serebella.com /encyclopedia/article-Filter_(optics).html   (1168 words)

 Filter (optics)   (Site not responding. Last check: 2007-10-31)
These filters reflect the unwanted portion of the light and transmit the remainder.Reflective filters are particularly suited for high-precision scientific work, since their exact filter band can be selected byprecise control of the coating.
Neutral density (ND) filters have a constant attenuation across the range of visible wavelengths, and are used toreduce the intensity of light by reflecting or absorbing a portion of it.
Another kind of optical filter is a polarization filter, which blocks ortransmits light according to its polarization.
www.therfcc.org /filter-optics--180392.html   (333 words)

 Steves Digicams - Crystal Optics Nikon Coolpix Filters
The filters are the same diameter as the lens so they do not block any of the sensors located near the lens.
The filter is turned as you view through the LCD to see the changes as it cuts off the light reflection at different angles.
The one on the left has the filter rotated to the point where the sky is the darkest.
www.steves-digicams.com /crystaloptics_filters.html   (299 words)

 Filter (optics) - TheBestLinks.com - Absorption, Colour, Glass, Inorganic chemistry, ...   (Site not responding. Last check: 2007-10-31)
Color filters are usually made from glass to which various inorganic or organic compounds have been added.
Neutral density (ND) filters look gray, have a constant attenuation across the range of visible wavelengths, and are used to reduce the intensity of light by reflecting or absorbing a portion of it.
Light from a clear blue sky is also polarized, and adjustable filters are used in color photography to darken the appearance of the sky without introducing colors to other objects, and in both color and fl-and-white photography to control specular reflections from objects and water.
www.thebestlinks.com /Filter___28__optics__29__.html   (626 words)

 Press Release: Ocean Optics Granted Filter Patents
The filter consists of two optical substrates coated with a linearly variable multilayer interference coating that varies in thickness from end to end.
Filter arrays in these cameras can be tuned for applications such as detection of UVA, UVB and UVC solar irradiation; discrimination of chlorophyll pigments in plants; identification of cancerous and non-cancerous tissue; and creation of super high-definition color systems for imaging.
Ocean Optics is a manufacturer of optical-sensing components such as miniature fiber optic spectrometers, fiber optic accessories, optical fibers, and high-precision thin films and optics.
www.oceanoptics.com /corporate/pressreleases/2004_Releases/filterpatent_release.asp   (437 words)

 Celestron Filters
Eyepiece filters are an invaluable aid in lunar and planetary observing.
When stacking color filters, the effective transmission of the combination you create is equal to the product of the spectral transmission of each of the filters used.
The Filter Set is comprised of two filters that thread into either the eyepiece or the filter adapter, which comes with the set.
www.handsonoptics.com /flt_celestron.html   (738 words)

 Definition of thin-film optics
12:...ometimes called '''ray optics''' is the branch of optics that describes [[light]] [[propagation]] in terms...
1: '''Crystal optics''' is the branch of [[optics]] that describes the behaviour of [[light]] in ''...
1:...ptive optics should not be confused with [[active optics]], which works on a longer timescale to correct t...
www.wordiq.com /search/thin-film+optics.html   (555 words)

 Filters | TutorGig.co.uk Encyclopedia   (Site not responding. Last check: 2007-10-31)
Thin film optical filters, also known as dichroic filter s, are filter optics optical filters which allow light of specific wavelength s to pass through unencumbered, while blocking other light from passing
A filter fluorometer is a type of fluorometer that may be employed in fluorescence spectroscopy.
Lameness filters are textbased mail filter filters used by SlashCode based websites to stop junk comments from being posted in response to stories.
www.tutorgig.co.uk /encyclopedia/sencyclo.jsp?keywords=Filters   (452 words)

 Patented Dichroic Filter Array Technology   (Site not responding. Last check: 2007-10-31)
After deposition of the filter, the patterned coating is rinsed in solvent, which removes any unwanted multi-layer and resist and leaves the desired patterned filter coating.
Selected bandpass filters can be combined in arrays for use with multi-spectral detector systems, or patterned in a ring structure in industrial and medical fiber optic instruments.
Ocean Optics has pioneered an optical coating technology that provides a precise, cost-effective means to integrate a variety of optical thin film coatings into the design and manufacture of an entire new generation of optomechanical and optoelectronic devices.
www.oceanoptics.com /products/dfa.asp   (915 words)

 Application of adaptive filters to visual testing and treatment in acquired pendular nystagmus   (Site not responding. Last check: 2007-10-31)
We used the sinusoidal filter output to control either an image-gating device or an image-shifting device, and assessed the efficacy of the system by determining its ability to restore acuity in normal subjects in whom the visual effects of APN were simulated by oscillating the acuity testing optotypes.
Filter output matches the nystagmus perfectly over most of the record; track is reacquired following the interruptions within less than one-half cycle of the nystagmus waveform.
Thus the filter is expected to interact with normal eye movements to the extent that their power spectra coincide with this range.
www.vard.org /jour/04/41/3a/smith.html   (5390 words)

 Filters in TutorGig Encyclopedia
Filters There are two filters for the fluorometer The primary filter or excitation filter or incident light..
Wikify date May 2006 h1 Energy transfer filters h1 br br Nonlinear Energy Transfer Filters ETF are a new class of filters that can be used to transfer or move energy from one frequency, or band of frequencies..
Filters are used to cleanse water for irrigation, drinking water, aquarium s, and swimming pool s.
www.tutorgig.com /es/Filters   (755 words)

 Welcome to Anttlers Optics..Telescopes..Microscopes..Accessories..Photo Restoration..Video Photo Albums
Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light.
The Observers filter wheel has a five-position caddy that allows five separate 1.25” filters to be threaded into position and rotated in front of a fitted eyepiece for rapid selection.
The filter is manufactured from glass and has a multi-layered metalized coating applied by a process of evaporation in a vacuum chamber.
www.geckooptical.com /anttlers_optics/telescope_acc_filters.html   (3131 words)

 Sirius Optics Variable Filter System (VFS)
I simply rotated the filter wheel without regard to the numerical scale, as I was interested in all the possibilities that the VFS has.
The filter's glass has coatings deposited on one side of its surface and is unlike died colored glass absorption filters.
I personally found the filter to be most engaging when attempting to fine tune the better views that the VFS is capable of delivering.
www.cloudynights.com /item.php?item_id=112   (3063 words)

 Kendrick Astro Instruments - Sirius Filters, Broadband, Narrowband, O-III   (Site not responding. Last check: 2007-10-31)
The Sirius Optics MV1 filter is a specialized corrective filter that greatly reduces the color fringing of blue-violet light.
This filter greatly reduces the effects of light pollution, as well as improving contrast and visibility of emission nebulae.
The filter consists of a 71mm diameter interference filter in an aluminum housing, with an exposed wheel that allows adjustments to be made.
www.kendrick-ai.com /astro/filter_sirius.html   (971 words)

 Filter optics - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-31)
Start the Filter optics article or add a request for it.
Look for "Filter optics" in Wiktionary, our sister dictionary project.
Look for "Filter optics" in the Wikimedia Commons, our repository for free images, music, sound, and video.
www.sciencedaily.com /encyclopedia/filter__optics_   (168 words)

 Astronomical Filters
With a slide, using a filter becomes second-nature, as effortless as focusing..
The filter's glass has coatings deposited on one side of its surface and is un.
For those of us who have more than one filter in our equipment arsenal, it is frequently a hastle (and even a hazard) to keep screwing, unscrewing, or even.
www.cloudynights.com /category.php?category_id=42&pr=2x9   (480 words)

 Celesta Optikk - Filter
Celesta Optikk har et bredt tilbud av filter fra flere leverandører, noe som betyr at sjansen er stor for at du vil finne et filter som dekker ditt behov i lista nedenfor.
Dette er filter som slipper gjennom lys i et smalt område mellom linjene til hydrogen (H-alfa og H-beta) og dobbelt jonisert oksygen (O-III), og blokkerer effektivt mot det meste av lysforurensning.
Vi tar forbehold om skrivefeil og endringer i spesifikasjonene fra våre leverandører.
www.celesta.no /filterliste.htm   (556 words)

 Compare Prices and Read Reviews on ACCESSORIES CRYSTAL OPTICS MULTICOATED UV FILTER at Epinions.com
A uv or ultraviolet filter not only clears up haziness and waviness caused by the sun's ultraviolet rays but for a small sum of money also protects your cam's very expensive main lens by shielding it from rocks, pebbles, moisture and dirt [sand from the beach?].
Not only that, it can greatly filter garbage from indoor arena lighting for filming your sibling's hockey, basketball or soccer game...not to mention other indoor activities of importance such as various church events, graduations and parties.
Without the uv filter in place, pictures somehow appear to be less clear than ones taken with the filter on.
www.epinions.com /content_116957023876   (765 words)

 JDS Uniphase Corporation How to Order
An "E" at the end of the item number indicates that the filter can be custom sized to larger than the "standard" 1 inch diameter.
IR filters are attenuated out of band to less than or equal to 0.1% average transmission over as great a wavelength range as reasonably practical.
The filter description indicates the out-of-band wavelength beyond which the filter will require additional blocking if the detector used with the filter is still active.
www.jdsu.com /index.cfm?pagepath=Products/Custom_Optics/Sample_Filter_Catalog/How_to_Order&id=4859   (194 words)

 Micron Optics - FFP Overview
Fabry-Perot filters and interferometers have provided the highest known optical wavelength resolution for 100 years, and are still considered seminal instruments in many branches of science including astronomy, atomic physics, chemistry, lasers, metrology, optics, plasma physics and spectroscopy.
The high degree to which the Micron Optics FFP Technology follows the Airy Function theory means optical systems can be designed to exhibit extremely low loss, predictable cross-talk, highly accurate power measurements, high Optical Signal to Noise Ratio (OSNR), and excellent wavelength resolution.
The high degree to which the filters follow the Airy Function theory allows optical engineers to accurately design single and cascaded filters for the densest DWDM systems (down to 6 GHz channel spacing).
www.micronoptics.com /telecom_ffp.htm   (777 words)

 Sirius Optics (Filters) NIR1 1.25" Near Infrared Blocking Eyepiece Filter
The Sirius Optics Near Infrared blocking filter is designed for use with CCD cameras and modified webcams.
This filter nearly eliminates this NIR from 700nm-950nm while keeping the transmission very high across the visible spectrum, thus removing the blooming affect from long exposure images.
The filter is virtually clear in the visible light spectrum, so it causes no color shift of captured objects.
www.buytelescopes.com /product.asp?t=&pid=3479&m=72   (218 words)

 Thin Film Optics Division   (Site not responding. Last check: 2007-10-31)
This single element multi-layer dielectric filter is designed for use with all commonly available visible laser diodes operating at a nominal 670 nm center wavelength.
The use of a filter with too narrow a bandpass response can severely reduce the system amplitude stability, while a very broad response will rapidly degrade the maximum achievable signal-to-noise performance.
Although the filter is made in various standard sizes, all 2 mm thick, some applications may require further processing of finished components.
www.ndcinfrared.com /tfodlaserdiode.aspx   (589 words)

 Metallized Capillaries as Probes for Raman Spectroscopy
To prevent the spurious emissions from overwhelming the desired Raman and/or fluorescence signals, it is necessary to incorporate spectral filters.
Alternatively, thin-film filters can be deposited directly on optical fibers or in proximity to the fibers, but the performances of such filters are inferior to those of free-space optical filters.
Hence, there would be no need for filters, ancillary filter optics, and associated mounting hardware vulnerable to misalignment, and so the probe would be better able to withstand such adverse environmental conditions as higher pressures, temperatures, and mechanical shocks.
www.nasatech.com /Briefs/June03/NPO30711.html   (633 words)

 Crystal Optics 62mm Circular Polarizer Filter
This filter is a must for all outdoor sunny or snowy high glare situations.
Circular Polarizing Filters are used to increase color saturation, like darkening blue skies so that white clouds stand out.
While graduated neutral density filters can also be used to achieve this effect, the need to position their transition line accurately precludes their use in many applications.
www.buydig.com /shop/product.aspx?sku=CROCPL62   (346 words)

 Crystal Optics 52mm Filter Kit
Filter Kit Tiffen 37mm UV Filter Tiffen 46mm 3 piece filter kit Tiffen 49mm 3 pc.
Filter Kit Tiffen 49mm UVFilter Tiffen 52mm 3pc Filter set Tiffen 52mm Circular polarizer Filter Tiffen 52mm UV Filter Tiffen 55mm 3 pc.
Filter Kit Tiffen 58mm Circular Polarizer Filter Tiffen 58mm UV Filter Tiffen 62mm 3 pc.
www.bwayphoto.com /product.asp?id=flkv52c750&pid=description   (183 words)

 Ocean Optics Granted Filter Patents
Dunedin, FL -- Ocean Optics, Inc. has been awarded two patents related to applications of its innovative dichroic filter array process, a breakthrough technology that creates filters in patterns precise enough to project still images.
U.S. Patent 6,638,668, "Method for making monolithic patterned dichroic filter arrays for spectroscopic imaging," combines microlithographic techniques with optical filter technology to produce dichroic filter arrays for spectroscopic imaging.
U.S. Patent 6,700,690 was issued March 2, 2004; Philip E. Buchsbaum and James D. Lane are the inventors.
www.fiberopticsonline.com /content/news/article.asp?docid={6FB68529-06B0-4EEE-9A4B-6B5A868E1D52}&VNETCOOKIE=NO   (305 words)

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