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 ?
The interference filters select the wavelengths of interest, so that the corresponding detector measures the light intensity at that wavelength only.
With decades of in-depth expert knowledge in producing optical filters - SCHOTT employee professor Geffken invented the first interference filters with modern stamping in the 1930's -, SCHOTT is a leading filter supplier for several markets, including chemical analysis, medical technology, and the relatively new field of optical sensors.
The installation of the new equipment in a specially built clean room will allow the precise deposition and testing of complex interference filters consisting of a few to well over 100 layers on substrates as large as 1.
Kit lenses SPAR-1 and a set of fields for verification Autoceratorefractometers or equivalent - 2 sets; set of interference filters for calibration of radiometers in the ultraviolet region of the spectrum - 2 sets; set of plates for testing refractometers - 2 sets; set filters for calibration photoelectric - 1 set; set of neutral filters for calibration of spectrophotometers in the visible region of the spectrum - 1 set; set of neutral filters for calibration of spectrophotometers in sleep spectrum - 2 sets; set of measures ferritic phase - 1komplekt; digital temperature calibrator RTC-700B or equivalent - 1 unit .
As a result, the company now offers a full range of interference filters that meet customer specifications.
In response to the needs of this market of the future, Optics Balzers has developed interference filters satisfying the most rigorous customer-specific requirements, for example for sun simulators.
As a result, the company that is an expert on specialty glass now offers a full range of interference filters that meet customer specifications.
Infitec stereo is a high-quality 3D stereo technology, using channel separation based on interference filters.
Filter sets use expensive interference filters and dichroic mirrors, and are often difficult to interchange.
The company is also a major producer of electronic components, such as cooling fans, electromagnetic interference filters (EMI), magnetic components, solenoids, and automotive parts.
These patents cover some of the key aspects behind the device design and fabrication of dynamically tunable thin-film interference filters that include layers with a thermo-optically tunable refractive index.
Today, Spectra-Physics has expanded to provide a broader spectrum of photonics products, capabilities, and services including Corion thin-film interference filters, Hilger scintillation and electro-optic crystals, replicated diffraction gratings from Richardson Gratings, Oriel Catalog and Instruments, and CIDTEC charged-injection device (CID) solid-state video cameras.

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