Standard & Custom Optical Filters And Coatings
Standard & CustomOptical Filters andCoatings2020 / 2021 Product CatalogControl the light, see your world1
Quality and Servicethat make a DifferenceUnlike most optical filter and coating manufacturers, wesupply spectral curves and digital data with most ordersat no additional charge, saving you the cost of incomingquality control. We’ll even help you reduce inventory byshipping your order only when you require it.2
ContentsAbout Andover CorporationFrequently Asked Questions45Dichroic FiltersProductsSets3537Coating CapabilitiesDichroic CoatingsNeutral Density FiltersSpecialized CoatingsAnti-Reflective (AR) CoatingsBandpass Filters77777Edge FiltersProductsLong Wave PassShort Wave Pass394040Steep-Edge Longpass FiltersLong Wave Pass41Infrared Filters & CoatingsInfrared Windows and SubstratesBroadband AR Coatings on GermaniumStandard IR Long Wave Pass FiltersStandard IR Bandpass FiltersIR Neutral Density Filters4345474951Custom IR Coatings52Colored GlassGeneralBandpass TypeHeat Absorbing TypeLong Wave Pass Type53545555Calibration Filter SetsAC-930AC-19305757AccessoriesThreaded RingsFilter WheelsTemperature ControllerEpolite FH-5313 Epoxy58596163Glossary65Int’l Representatives66Index (Alphabetical)68Custom AdvantageOptical PolishingEngineering AssistanceOptical FabricationMachine FabricationQuality ControlOptical TestingImage Quality FiltersSuccess StoriesBandpass FiltersAbout Bandpass FiltersMinimizing Wavelength Shift10 Basic Filter TypesBandpass Filter Selection GuideStandard Bandpass Filters ProductsHigh-Transmitting Bandpass FiltersHard Coat Narrowband Filters ProductsHard Coat Broadband Filter ProductsSemi-Custom Bandpass Filter ProductsAstronomy UBVRI Filters999988101112121315161718202226Metallic FiltersNeutral Density Filters28Absorptive FiltersNeutral Density Filters31Filter SetsNeutral Density SetsMetallic & Absorptive SetsHeat Control FiltersHot MirrorUltraviolet Cold MirrorCold Mirror850nm Cold MirrorsInfrared Suppressing32323334343434Contact an Andover Corporation representative for questions or further informationOrder online at www.andovercorp.com or call us at 1.888.893.9992 (Toll-free in the US)3
About Andover CorporationAndover Corporation was established in 1976 with the purpose ofdesigning and manufacturing high-quality optical filters and coatingsfor a wide variety of applications; including medical instrumentation,fluorescence studies, machine vision, astronomical observation,telecommunications, space-borne systems and defense systems. Asthe company grows, our focus remains on quality. Our current facilityspans 44,000 square feet on 17 acres of land in Salem, NH.Our facility is custom-designed and state-of-the-art. It includesautomated coating, glass polishing, and fabrication equipment. Ourtesting capabilities are extensive, comprising of both automatedspectrophotometers for broadband spectral measurements, and ultrahigh-resolution spectrophotometers for narrowband measurements.Our optical metrology lab features a custom-designed, computercontrolled tunable interferometer to measure transmitted wavefrontsbeyond the capabilities of a traditional laser interferometer.Engineered. Reliable. Available.4
Frequently Asked QuestionsHow do you distinguish between animage quality and a commercial qualityfilter?Image quality filters are ideal for applicationsthat require high resolution, such asastronomical observations. To make theseproducts, we polish high-quality optical glassto ensure the substrate is extremely flat andparallel, and then apply anti-reflective coatingson the external surfaces to reduce ghost imagesand maximize energy throughput. Commercialquality filters can have the same spectralcharacteristics as image quality filters, howeverthey are designed for use in instruments ratherthan imaging applications.What do I need to do to maintain my filtersin good condition?We recommend cleaning your filters about everythree months. If the environment is particularlydusty or you often shift the filters betweenapplications, more regular cleaning may bewarranted. We suggest that you apply acetone,methanol, or alcohol to a soft tissue and thenrub the filter using a circular motion.Are there any particular environmentalconditions to consider when using a filter?It’s important to avoid prolonged exposureto high humidity and large temperaturevariations. To reduce the risk of damage dueto thermal shock, we recommend a maximumoperating temperature of 70 C and a maximumtemperature change of 5 C per minute.When placing an order, why do I need toinclude the operating temperature?The center wavelength of an interferencefilter shifts linearly with changes in ambienttemperature. Our filter designs take this intoconsideration to ensure proper performance atyour specific operating temperature.When can I expect to receive my order?Standard products ship within two to threedays of receipt of order.Do you offer discounts on surplus stock?Andover offers generous price terms on oursurplus inventory. Just visit our website atwww.andovercorp.com/surplus and plug inthe desired wavelength to see what’s available.Do you have a minimum order value /quantity?No minimum value or quantity required.How do I send custom specifications forquoting?You can do this one of three ways: Email your request to info@andcorp.com Fax your specifications to 603.893.6508Attn: Technical Sales Department Call toll-free: 888-893-99925
Andover Corporation houses awide array of coating technologiesincluding magnetron sputtering, ion-assisted electronbeam deposition and resistance evaporation, producingthe best possible solutions to suit your needs. Stateof-the-art, custom-designed and computer-controlledcoating chambers ensure accuracy and repeatability.6
CoatingCapabilitiesAndover Corporation has the unique ability to provide adiverse range of coatings spanning a broad wavelengthrange on a wide variety of materials. We producecoatings for a multitude of applications, ranging fromenvironmental monitoring to space-based astronomy.Our AS9100 certification ensures compliance withaerospace as well as military standards. Variety of coating technologies to suit any need Wavelengths from 193nm to 14µm Custom coatings on a wide variety of substratesDichroic CoatingsNeutral Density FiltersAndover designs and produces custom dichroiccoatings for a variety of applications. Our in-houseengineers can design exotic coatings to meet verystringent spectral and environmental requirements. Aswith all of our coatings, they can be applied to a widevariety of materials, in a myriad of shapes and sizes.Andover is a leader in flat response neutral densityfilters in the UV to near infrared (250nm-2000nm)and far infrared (2000-14000nm). These coatings arehard and pinhole-free. Our ND Filters exhibit industryleading spectral neutrality over a broad wavelengthrange, with optical densities up to 4.0. (We can depositA/R coating on the uncoated surface for a nominal fee.)Anti-Reflective ARCoatingsBandpass FiltersAndover produces hard oxide AR coatings from193nm to 14µm. We routinely coat customer-suppliedsubstrate material in all shapes and sizes: lenses,prisms, flats, domes, etc. We can coat a wide variety ofmaterials, ranging from typical optical glass to exoticmaterials such as Calcium Fluoride, Zinc Sulfide andZinc Selenide. The hard coatings not only reducereflections to 0.1% at angles up to 50 , but also helpprotect optical surfaces, as the coating is more durablethan the uncoated substrate.We produce bandpass filters over a much broaderrange than any other coating firm, from 193nm to14µm in wavelength. Bandwidths range from verywide, ( 10%) to extremely narrow, ( 0.02%). We canproduce semi-custom bandpass filters with short leadtimes. We also have over 1,500 standard filters.Specialized CoatingsWith our computer-controlled systems, we can quicklyproduce a variety of high-quality coatings in sizes up to300mm with excellent repeatability using any processfrom resistance evaporation to magnetron sputtering.7
Total quality control andoptical testingstarts with the raw material and continues throughthe finished product. To ensure total quality control,our equipment is custom designed and constructedto our exact specifications.8
CustomAdvantageWhile stocking over 1,500 standard filters, AndoverCorporation has built a worldwide reputation fordeveloping custom, state-of-the-art, filters and coatings.With our extensive engineering experience andadvanced manufacturing facility, we control the entireproduction process to ensure that you receive only thehighest-quality products, attentive service, and timelydelivery. Fully-automated systems for excellent repeatabilityand rapid turnaround Continuously updated manufacturing processes Products that far exceed industry standards for qualityUtilizing the Cary 7000 spectrophotometer, Andover is able to measure absolute specular reflection over a widerange of angles, facilitating very accurate measurements of dichroic cube beamsplitter performance, and othercomplex measurements.We check all filter glass for striae, bubbles and inclusions using our custom-designed inclusion tester. Thisinstrument detects minute defects, even in materials that do not transmit visible light.Our in-house environmental chambers allow us to perform routine and custom product testing at temperaturesfrom -62 C to over 500 C. This capability, along with the ability to vary humidity levels, ensures compliance withyour custom specification or MIL standard.Most interferometers rely on laser light to produce interference fringes. Many bandpass filters cannot be measuredwith these instruments, as they do not transmit the laser wavelength. To solve this problem, we constructed acomputerized, tunable white light interferometer that produces actual transmitted wavefront interferograms offilters at any wavelength in the range of ceOpticalFabricationMachineFabricationAndover’s in-house polishingfacility can achieve flatnessup to λ/10 wave per inchand parallelism of 5 arcseconds or better, with asurface quality of 20/10.Andover’s in-houseengineering staff can provideinnovative assistance inoptical and mechanicaldesign, to ensure the successof your project.Whether you require a filterthat’s 2mm or 350mm,Andover has fully automatedCNC equipment to fabricateexactly what you need, withthe quality you expect, andusing the optical material ofyour choice.Andover’s 3-axis machiningcenters allow us to fabricatecomplex tooling quickly andaccurately, greatly reducingthe lead time for customcomponents.9
Image Quality FiltersHave demanding custom imaging requirements?Image quality filters are ideal for applications that require high resolution,such as astronomical observations, video monitoring systems, high-resolutionphotography, and other imaging applications. To meet these demandingrequirements, Andover Corporation has developed a line of custom ImageQuality (IQ) filters using high-grade optical material that is both striation andinclusion-free. The surfaces are ground and polished to a transmitted wavefrontof λ/4 per inch and parallel to 30 arc seconds or better. The internal coatingpositions are optimized and the exterior surfaces anti-reflection coated toeliminate multiple images and fringe patterns, maximizing energy throughput.For very high-resolution applications, we can also provide image quality filterswith a transmitted wavefront of λ/10 and parallelism of 10 arc seconds.Anti-ReflectiveCoatings4.0% ReflectanceAll Image Quality Filters includean anti-reflective (AR) coating. ARcoatings are an effective way to limitreflections while also improvingoptimal system performance. AndoverCorporation manufactures a variety ofanti-reflective coatings designed forhigh efficiency, mechanical durability,and environmental stability.Broadband visible 0550600Wavelength (nm)All filters come with test documentationContact an Andover Corporation representative for questions or further informationOrder online at www.andovercorp.com or call us at 1.888.893.9992 (Toll-free in the US)10650700
Success StoriesA few notable achievementsMErcury Surface, Space ENvironment, GEochemistry and Ranging(MESSENGER)MESSENGER launched on August 3, 2004. Its mission is to analyze the surface of Mercury,to better understand our own planet. It carries seven instruments, one of which is theMercury Dual Imaging System (MDIS), a camera with wide and narrow fields-of-view, formonochrome, color and stereo imaging.The Atmospheric Imaging Assembly (AIA) for the Solar DynamicsObservatory (SDO)SDO is designed to provide an unprecedented view of the solar corona, taking imagesthat span at least 1.3 solar diameters in multiple wavelengths nearly simultaneously, ata resolution of about 1 arcsec and at a cadence of 10 seconds or better. This data willsignificantly improve our understanding of the physics behind the activity displayed bythe Sun’s atmosphere, which drives space weather in the heliosphere and in planetaryenvironments.The Michelson Doppler Imager (MDI)MDI is part of an international collaboration to study the interior structure and dynamicsof the Sun. The MDI team was responsible for the design and fabrication, and now for theoperation, of the MDI instrument on board the SOlar and Heliospheric Observatory (SOHO)spacecraft.The Interface Region Imaging Spectrograph (IRIS)The IRIS mission is dedicated to understanding the interface between the photosphere andcorona, by tracing the flow of energy and plasma through the chromosphere and transitionregion into the corona using spectrometry and imaging. It launched on June, 28 2013.Helioseismic and Magnetic Imager (HMI)The primary goal of the HMI investigation is to study the origin of solar variability and tocharacterize and understand the Sun’s interior and the various components of magneticactivity. The HMI investigation is based on measurements obtained with the HMI instrumentas part of the Solar Dynamics Observatory (SDO) mission.Stratospheric Observatory for Infrared Astronomy (SOFIA)SOFIA is the largest airborne observatory in the world, consisting of an extensively modifiedBoeing 747SP aircraft carrying a reflecting telescope with an effective diameter of 2.5 meters(100 inches). It is capable of making observations that are impossible for even the largest andhighest ground-based telescopes.The Cross-track Infrared Sounder (CrIS)CrIS is a Michelson interferometer infrared sounder that is part of the Cross-track InfraredMicrowave Sounding Suite (CrIMSS). The objective of CrIMSS is to provide global threedimensional soundings of atmospheric temperature and moisture as well as provide data onother geophysical parameters.11
AboutBandpass FiltersThe use of bandpass filters is one of the simplest and most economical ways to transmit a well-defined band of light andto reject all other unwanted radiation. Their design is essentially a thin film Fabry-Perot interferometer formed by vacuumdeposition, and consists of two reflecting stacks separated by an even-order spacer layer.Because the Fabry-Perot filter is Lorentzian in shape, the cut-on and cut-off slopes are shallow and the rate of attenuationin the out-of-band blocking range is slow. To improve the slopes and increase the attenuation in the blocking band, weintroduce more cavities into the construction of our standard dielectric bandpass filters.Environmental ConsiderationsAmbient temperature and optical path geometry are important factorsto consider in selecting or specifying bandpass filters.Ambient TemperatureAngle of IncidenceThe center wavelength of a bandpass filter shifts linearlywith changes in ambient temperature—up with apositive change and down with a negative change.The temperature coefficient chart below gives a goodapproximation of the shift in wavelength for a giventemperature change.The central wavelength of the all-dielectric Fabry-Perotfilter shifts lower with an increase in the incident angle. Theamount of shift depends upon the incident angle and thefilter’s effective index (N*). This feature can be very usefulwhen tuning a filter to the desired central wavelength. Usethe formula below to determine the wavelength shift of afilter in collimated light with incident angles up to 15 .To counter these effects, Andover has developedTemperature Controllers that help to maintain the ambienttemperature of bandpass filters. (For more information seepage 68 (Temperature Controller).Where: Peak wavelength at incident angle θTemperature Coefficient (nm/ C)Temperature Wavelength Shift Coefficient Peak wavelength at normal incidence0.035 Refractive index of incident medium (air 1.0)0.030 Effective index of the filter assembly0.025 Angle of incidence0.0200.0150.010200400600800Center Wavelength (nm)1210001200When using a filter with non-collimated light, thewavelength shift will appear somewhat less than that ofcollimated light at the same angle. In a cone of light, onlythe central ray is normal to the surface while all others areincreasingly off-angle. To approximate this shift, use thissame formula and divide the results by two. (This approachworks in systems where the full cone angle is up to 20 ).
About Bandpass FiltersSpectral Profiles for Andover’s 10 Basic Filter TypesType 20.9 x Peak TxNom 0.25 x FWHM0.5 x Peak TxFWHM10.010-11.0Nom 3 x FWHM10-20.1Nom 10 x FWHMNom 20x FWHM10-30.01100.00.0013 cavity10-110.01.00.1Nom 6.3 x FWHM10-30.01FWHM10-11.0Nom 1.3x FWHM10-20.1Nom 1.8x FWHM10-3Nom 2.25x FWHM10-40.001Nom 4.25x FWHM10-5100.0Nom 0.8x FWHM0.5 x Peak Tx10-110.010.00.010.001Nom 12.0 x FWHMWavelengthFWHMNom 1.5x FWHM10-21.00.1Nom 2.2x FWHM10-3Nom 3.2x FWHM0.0110-4Nom 5.4 x FWHMNom 15.0 x FWHM10-5Type 66 cavity0.9 x Peak TxNom 0.85x FWHM0.5 x Peak TxFWHM10-11.00.1Nom 0.65x FWHMWavelength5 cavity0.9 x Peak Tx0.9 x Peak Tx0.5 x Peak Tx0.001Type 5% Normalized Transmittance% Normalized TransmittanceMax 15.0 x FWHM10-4100.0Wavelength4 cavity0.01Nom 3.5 x FWHM0.001Type 410.0Nom 2.0 x FWHM10-2Wavelength100.0Nom 0.5 x FWHMFWHM0.9 x Peak Tx0.5 x Peak TxNom 1.25x FWHM10-2Nom 1.65x FWHM10-3Nom 1.95x FWHM10-4Nom 3.85x FWHM10-5Nom 10.0 x FWHM100.0% Normalized Transmittance100.0% Normalized TransmittanceType 32 cavity% Normalized Transmittance1 cavity% Normalized TransmittanceType 110.00.9 x Peak TxNom 0.85x FWHM0.5 x Peak TxFWHM10-11.010-20.10.01Nom 1.18x FWHMNom 1.45x FWHM10-3Nom 1.75x FWHM10-40.001Nom 3.2x FWHM10-5WavelengthNom 5.0 x FWHMWavelengthFilter types 1-6 represent unblocked filter profiles. Bandshape may vary depending upon level ofadditional blockingNormalizedTransmittanceof Peak (%)Full Bandwidth Multiplier (Nominal)1 Cavity2 Cavity3 Cavity4 Cavity5 Cavity6 Cavity90.00.25 nom.0.5 3
MDM filters are a special type of bandpass filter utilizingdielectric layers (D) surrounded by metallic layers (M). Theyprovide excellent throughput over a wide spectral range,while providing good out-of-band blocking.Type 7Type 8100.0100.0MDM 25nm BANDWIDTH0.5 x Peak TxFWHM1.0 0.93x CW/L 1.05 x CW/L0.10.01 1.5 x CW/L 0.9x CW/L 0.85x CW/LCW/L 1.07 x CW/L 1.1 x CW/L% Normalized Transmittance% Normalized TransmittanceMDM 10nm BANDWIDTH0.5 x Peak Tx1.00.10.010.001FWHM 0.85x CW/L 1.12 x CW/L 2.0 x CW/L 0.8x CW/L 0.7x CW/L 1.2 x CW/LCW/L0.001WavelengthWavelengthType 9Type 10MDM 10-70nm BANDWIDTHMDM 80-100nm BANDWIDTH100.00.5 x Peak Tx0.10.01FWHM 0.8 x CW/L 1.25 x CW/L 1.4 x CW/L 0.75 x CW/L 0.7 x CW/LCW/L0.0010.5 x Peak Tx1.00.10.010.001Wavelength14 1.65 x CW/L% Normalized Transmittance% Normalized Transmittance100.01.0 1.35 x CW/LFWHM 0.85 x CW/L 1.12 x CW/L 0.8 x CW/L 0.75 x CW/L 1.35 x CW/LCW/LWavelength 1.6 x CW/L
Bandpass Filter Selection GuideBandpass Filter Selection GuideThere are many variations to a bandpass filter’s construction, each with specific advantages. Andover offers a varietyof options so that you can select what is best-suited for your application.Bandpass Filter TypesStandardBandpass FiltersHigh-TransmittingBandpass FiltersSemi-CustomBandpass FiltersPage 16Page 17Pages 22-25Andover’s StandardBandpass filters havebeen the mainstayof the industryfor decades. Withour proprietarystabilization andsealing method thesefilters will generallylast for 10-20 yearsin the field. Theirlongevity, coupledwith their low costand ready availability,make these a greatchoice for mostapplications.Andover’s HighTransmittingBandpass filtersare a variant of theStandard Bandpassfilter line. Designedfor use with PMTsand photodiodes,they employ onlydielectric coatings,and have a blockingrange tailored tothe detector. Thisresults in highertransmission thantheir fully-blockedcounterparts. Foryour convenience,the high-transmittingbandpass filters arelisted in the StandardBandpass section,and are highlightedfor easy identificationIn order to make itsimple for customersto custom-tailor abandpass filter fortheir application,Andover offers aline of Semi-Custombandpass filters.Their constructionis similar to boththe StandardBandpass andHigh-Transmittingbandpass filterofferings. We offera wide selectionof wavelengths,bandwidths andsizes, and offer twoblocking options.Andover offers one ofthe broadest rangesof hard-coatednarrowband filtersin the industry. Ourfilters feature veryhigh transmission,and dense blockingfrom UV-1200nm.They are suitable atedHardHardFirst-surface coatings First-surface coatingsWavelength range193nm - 2400nm365.0nm - 1550nm214nm - 2400nm334nm - 1550nm345nm - 785nmBandwidths1nm - 100nm10nm - 40nm0.15nm - 80nm10nm80nm - 300nmBlockingOD4UV-FIROD4UV-800nm or1000nmOD4UV-1000nm or UVFIRVaries by W/LOD4UV-1200nmSizes (diameter)12.5mm, 25mmand 50mm12.5mm, 25mmand 50mm12.5mm, 25mmand 50mm25mm12.5mm, 25mmand 50mmType & PageDescriptionHard-CoatedNarrowbandFiltersPages 18-19Hard-CoatedBroadband FiltersPages 20-21This line of hard,first-surfacecoated filters wasdesigned to coverthe standard Ramanspectroscopy lines.They feature veryhigh transmissionover a broad rangeabout the wavelengthof interest.Key attributesFeaturesLow cost Available fromstock First surfacecoatings Suitable for hightemperatures High-TransmissionHighlycustomizeable Quickly locate the best suited filter for your specific application with the following chart that summarizesmajor features of various filters types. For detailed information, please refer to the pages listed. For furtheradvice please contact our technical sales staff at info@andcorp.com.15
StandardBandpass FiltersTypical Applications Include: Spectral Radiometry Medical Diagnostics Chemical AnalysisAndover offers one of the most extensive selectionsof bandpass filters in the industry, including many ofthe primary laser, mercury, biomedical, and analyticalspectral lines.We use a proprietary method to stabilize our productsto prevent drift of peak wavelength with age andhermetically seal each filter for maximum protectionagainst humidity. Each filter is mounted in a blackanodized aluminum ring, adding further protectionagainst chipping, scratching, and moisture penetration.This added protection leads to an extended shelf life. Colorimetry Wavelengths from the ultraviolet through theinfrared Stabilized to prevent drift of peak wavelengthover time Hermetically sealed and protected by ananodized aluminum ring Custom sizes availableGo to pass-filter-selection-guide/ to order online.General SpecificationsDiameter Tolerance: 0/-0.25mmUsable Aperture:Filter SizeUsable Aperture12.5mm Ø9.0mm Ø25.0mm Ø21.0mm Ø50.0mm Ø45.0mm ØSurface Quality:80-50 (Per MIL-PRF-13830B)Optical Quality:Commercial instrumentation gradeOut-of-Band Blocking:1 x 10-4 avg. from X-ray to FIRSpecification Temperature: 23ºCMax. Survival Temp Range:CW/L 214-380nm-50ºC to 50ºCCW/L 380.1-2400nm-50ºC to 70ºCHumidity Resistance:Per MIL-C-48497AMechanical:Mounted in an anodized aluminum ringOptional: Mounted in threaded ring - see pg 58 for thread sizes16
High-TransmittingBandpass FiltersAndover offers a high-transmittance variant of itsstandard bandpass filter selection. By tailoring theblocking range to match the detector, we can providemaximum possible throughput while maintaininggood blocking to meet the customer’s needs.Wavelengths include all popular laser, mercurybiomedical, and analytical spectral lines.All filters are constructed using the same high-qualitymaterials and methods as our standard bandpassfilters, thus providing a highly stable, long-lasting filter.Typical Applications Include: Spectral Radiometry Medical Diagnostics Wavelengths from the ultraviolet through theinfrared Stabilized to prevent drift of peak wavelengthover time Hermetically sealed and protected by ananodized aluminum ring Chemical Analysis Transmission as high as 80% Colorimetry Custom sizes availableHigh-Transmitting Bandpass FiltersWe also offer a High-Transmitting variant of our standard bandpass filter selection. By tailoring the blocking range to match thedetector, we can provide maximum possible throughput while maintaining good blocking to meet the customer’s needs. Wavelengthsinclude all popular laser, mercury, biomedical and analytical spectral lines.Go to -transmitting-bandpass-filters/ for part numbers, pricing, andto order online.General SpecificationsDiameter Tolerance: 0/-0.25mmUsable Aperture:Filter SizeUsable Aperture12.5mm Ø9.0mm Ø25.0mm Ø21.0mm Ø50.0mm Ø45.0mm ØSurface Quality:80-50 (Per MIL-PRF-13830B)Optical Quality:Commercial instrumentation gradeOut-of-Band Blocking:1 x 10-4 avg. from X-ray to FIRSpecification Temperature: 23ºCMax. Survival Temp Range:CW/L 350-380nm-50ºC to 50ºCCW/L 380.1-2400nm-50ºC to 70ºCHumidity Resistance:Per MIL-C-48497AMechanical:Mounted in an anodized aluminum ringOptional: Mounted in threaded ring - see pg 58 for thread sizes17
Hard-Coated Narrowband FiltersHard-CoatedNarrowband FiltersTypical Applications Include: Machine Vision Biotech Instrumentation Medical Devices Hard, durable, first-suface coatings632nm Narrowband - 632HC10-251009080% TransmissionOur first-surface, hard-coat narrowband filters employplasma-deposited, hard-oxide coatings on BorosilicateGlass and do not utilize any absorbing filter glasses,making them suitable for high temperature applications.They provide a steep transition from a high, peaktransmission to OD4 blocking. Available at wavelengthsfrom 334nm to 1550nm, including all major laser linesand atomic absorption lines. All filters are mounted inblack anodized aluminum rings to provide protectionand easy identification. Please contact our technicalsales department for pricing and deliverly. Suitable for high-temperature applications706050403020100Thickness:5.0 0.25mmSize Tolerance: 0.0mm / -0.1mmMinimum Clear Aperture:21mm dia.Substrate Material:Borosilicate GlassFlatness:3-5 wavesSurface Quality:80-50 per MIL-C-48497AHumidity and Abrasion:Per MIL-C-675ADurability:Per MIL-C-48497AOperating Temperature:-50 C to 100 CMechanical:Mounted in black anodizedaluminum620630640Wavelength (nm)650660632nm Narrowband - 632HC10-251009080% TransmissionGeneral Specifications610706050403020100200 300400500 600700800900 1000 1100 1200Wavelength (nm)18
19CW/L(nm)FWHM(nm)Min Trans(%)OD4 (avg.)Blocking (%)Part Number25mm ØCW/L(nm)FWHM(nm)Min Trans(%)OD4 (avg.)Blocking (%)Part Number25mm 590200-150
range, with optical densities up to 4.0. (We can deposit A/R coating on the uncoated surface for a nominal fee.) Dichroic Coatings Andover designs and produces custom dichroic coatings for a variety of applications. Our in-house engineers can design exotic coatings to meet v
Designing FIR Filters with Frequency Selection Designing FIR Filters with Equi-ripples Designing IIR Filters with Discrete Differentiation Designing IIR Filters with Impulse Invariance Designing IIR Filters with the Bilinear Transform Related Analog Filters. Lecture 22: Design of FIR / IIR Filters. Foundations of Digital .
2. Tunable optical filters 3. ADD-Drop Filters 4. Broadband Optical Amplifiers 5. Optical Cross Connects In addition there are a number of important support components that also must be developed. These include: a. Optical Directional Couplers b. Wavelength Filters c. Optical isolators d. Optical Equalizers e. Polarizers, rotators .
IIR filters are digital filters with infinite impulse response. Unlike FIR filters, they have the feedback (a recursive part of a filter) and are known as recursive digital filters. Figure 2 Block diagrams of FIR and IIR filters For this reason IIR filters have much better frequency response than FIR filters of the same order. Unlike FIR .
Hydraulic Filters Pleated Oil Filters EDM Filters Water Absorbent Filters Depth Filter Elements FUEL FILTERS AND SEPARATORS Coalescers Separators Clay Filters . Gresen Guardian Filter Gulfgate Engineering Hahn Hankinson International Harmsco Ind. Filters
Since we have a custom component in the model we can open the Custom component editor. Edit custom 1. Select the User_end_plate component symbol. component 2. Right-click and select Edit custom component. The Custom component editor opens along with the Custom component editor toolbar, the Custom component browser and four views of the custom .
Custom Pack Design Manual Edition 2009/2010. This manual provides the sales force with instruction tools to help to discuss an extracorporeal . Arterial filters / Arterial Bubble traps 52 Pre Bypass filters 53 Gas / Bacterial filters 54 Transfusion filters 55 Cardioplegia filters 55 Hemoconcentrators 56 8. Monitoring Equipment 57
domain to obtain a digital filter that meets the specifications. The commonly used analog filters are 1. Butterworth filters - no ripples at all, 2. Chebychev filters - ripples in the passband OR in the stopband, and 3. Elliptical filters - ripples in BOTH the pass and stop bands. The design of these filters are well documented in the literature.
East Coast Filter, Inc. can provide you with all of your filtration needs at very competitive prices. We have a full line of HVAC Filters such as Expanded Metal Filters, Pleated Filters, Pocket Bag Filters, Throwaways, Roll Media and HEPA Filters. We also supply Filters for Air Compressors,
