interference filter


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Interference filter

An optical filter in which the wavelengths that are not transmitted are removed by interference phenomena rather than by absorption or scattering. In addition to being able to duplicate most of the spectral characteristics of absorption color filters, these devices can be made to transmit a very narrow band of wavelengths. They can thus be used as monochromators to examine a radiation source at the wavelength of a single spectrum line. For example, the solar disk can be observed in light of the hydrogen line Hα and thus the distribution of excited hydrogen over the disk can be determined. Most narrow-band interference filters are based on the Fabry-Perot interferometer. See Interference of waves, Interferometry

interference filter

An optical, ultraviolet, or infrared filter in which unwanted wavelengths are removed by destructive interference rather than by absorption. It produces a very narrow band of wavelengths, typically between 1 and 10 nanometers. One form, the multilayer filter, consists of a stack of transparently thin films with different refractive indices deposited on an optical glass substrate. The films allow only a selected waveband of 1 nm or less to be transmitted right through. The remaining wavelengths are reflected and caused to interfere destructively.

interference filter

[‚in·tər′fir·əns ¦fil·tər]
(electronics)
A filter used to attenuate artificial interference signals entering a receiver through its power line.
A filter used to attenuate unwanted carrier-frequency signals in the tuned circuits of a receiver.
(optics)
An optical filter in which the wavelengths that are not transmitted are removed by interference phenomena rather then by absorbtion or scattering.
References in periodicals archive ?
Low-temperature sputtering manufacturing process and lift off technology enables the interference filter to have low sensitivity to changes in temperature and exposure to high humidity.
The interference filters select the wavelengths of interest, so that the corresponding detector measures the light intensity at that wavelength only.
But when an interference filter is tipped in the light path its passband "window" shifts toward the blue end of the spectrum.
5 m large rear projection surface with the possibility of a stereo-capable projection based on interference filter technology.
Laura Lunardo, COO of Optometrics, noted that: "The POC line will add Long Life Filters to our laminated interference filter product set, enabling Optometrics to offer a broader range of filters to the spectroscopy, astronomical, medical and laser markets as well as to adjacent markets that we do not currently serve.
7, 1995--TRW announced today the immediate availability of TRW uDISC(TM) Flex Wafer, a flexible electromagnetic interference filter that provides a low-cost solution to reducing noise emitted by electronic devices.
The company's products include power supplies and electromagnetic interference filters for use in industrial, semiconductor capital equipment, medical, defense, aerospace, and other end markets.
Features, which was established by the Bank of Canada to develop and produce thin film interference filters using vacuum deposition technology, from which to make colour shift windowed threads for banknotes.
Limited tenders are invited for Interference Filters Andover Corporation Make Circular Interference Filters Of Size 25mm +/-0.
The Kaelus RF Interference Filters offer excellent suppression of extraneous signal interference, enabling increased signal strength to meet the ever-expanding passenger requirement for data throughput without affecting the safe and consistent flow of rail traffic.
State-of-the-art LED technology and interference filters with hard dielectric coatings.
Its products include speciality lasers and light sources, electro-optical components, opto-mechanical assemblies, including aspheric lenses, laser mirrors, interference filters and polarisers.

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