Infrared Optical SystemsUniversity of Arizona
October 4 2006 Infrared Optics Seminar 8 IR Signal The total signal received by the detectors is the product of the target spectral emission the atmospheric transmittance the optical transmittance and the detector spectral response Of course there s also the radiometric factors such as target size solid angles
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Crystallization of Calcium Aluminate Infrared Glass
Calcium aluminate glass ceramics were fabricated by a heating treatment crystallization process The crystallization behavior and infrared transmittance were analyzed by differential scanning calorimetry X ray diffraction Fourier transform infrared spectroscopy and scanning electron microscopy respectively
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OSA Refractive Indices of Infrared Optical Materials and
Calcium aluminate 3 07 594 8 1 770S 1 6731 1 6485 1 6413 1 6357 1 6297 1 6225 1 6140 1 6039 1 5919 3 IR 20 5 18 542 9 760 1 8852 1 8443 1 8347 1 8284 1 8220 1 8147 1 8063 1 7964 1 7848 1 7714 4 Strontium titanate 5 122 595 9 4 2080 2 4776 2 3161 2 2862 2 2679 2 2504 2 2312 2 2091 2 1838 2 1550 2 1223 5 Magnesium oxide 3 576 692 13 8 2800 1 7454
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OSA Infrared Transmittance of Optical Materials at Low
Transmittance measurements of a variety of infrared optical materials were made at approximate temperatures of 50°K 85°K and 300°K in the 1 0 μ to 15 0 μ wavelength region The effects of these low temperatures on transmittance are presented in the form of curves with transmittance as a function of wavelength A change in external transmittance was measured for some materials
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Solidification/stabilization of toxic metals in calcium
phases or OPC modified by calcium aluminate calcium sulphate and/or admixtures 1 7 occasionally forming new phases with the metallic cations In addition G Qian and co workers have extensively studied the S/S processes of toxic metals in fly ash calcium sulfoaluminate cement Friedel s salt or fly ashes 8 10
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Optical and Physical Properties of Some Calcium Aluminate
Calcium aluminate glasses containing alkali oxides and iron oxide will transmit infrared radiation to about 6 μ and still have satisfactory working properties Their refractive index density expansion Young s modulus modulus of rupture fracture velocity Knoop hardness and some electrical and chemical properties are evaluated
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C S H gels in blended cements Study by infrared
kind as calcium aluminate cement CAC This fact leads to a decrease of Ca/Si ratio and to an increase of Al/Ca ratio A lot of works study the structure of C S H gel by means RMN technique with isotopes of 27 Al and 29 Si In the literature there are few works that study the gel by infrared spectroscopy Yu et
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Evaluation of Calcium Aluminate/Calcium Phosphate Based
The curing of calcium aluminate cement occurs with high water consumption during setting and hardening of prepared pastes The relatively high strength values of calcium aluminate pastes compared to those of calcium phosphate and also wide range variations in the consistency and formulations make it suitable for a wide range of applications 3 4
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of Calcium Aluminate CementMDPI
Materials 2018 11 1849 3 of 15 Table 1 Compositions of calcium aluminate cement CAC and colloidal silica CS wt Compositions Al2O3 CaO SiO2 Fe2O3 Na2O CAC 70 29 0 15 0 05 0 25 CS 0 358 0 065 30 31 2 63
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Calcite R150020RRUFF Database Raman X ray Infrared
Carlson E T Berman H A 1960 Some observations on the calcium aluminate carbonate hydrates Journal of Research of the National Bureau of StandardsA Physics and Chemistry 64A Porto S P S Giordmaine J A Damen T C 1966 Depolarization of Raman scattering in calcite Physical Review 147
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An i r investigation on some calcium aluminate hydrates
Grating Infrared Spectrofotometer type Epi G2 In those cases where partially deuterated calcium alumi nate hydrates were investigated the KBr disc method was An i r investigation on some calcium aluminate hydrates 1411 The frequencies 3615 and 3555 are comparable with those of the bands occurring in the spectra of NaCIO4 H=O
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IR Window Transmittance Temperature Dependence
camera realbody its transmittance will vary with its temperature and the target temperature One popular class of IR window is based on fluoride salt crystals The two IR windows made from these are barium fluoride BaF 2 and calcium fluoride CaF 2 BaF 2 is softer than CaF 2 Both have some
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Structural Investigation of CaO–Al2O3 and
The structural aspects of aluminate systems have been reported by some scientists Tarte proposed the characteris tic frequency ranges for AlO 4 tetrahedra as 900–650cm 21 and for AlO 6 octahedra as 680–400cm 21 from the in frared spectra of inorganic calcium aluminates 5 McMillan et al interpreted the Raman spectrum of the 50 mol
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Influence of the synthetic calcium aluminate hydrate and
The infrared spectrum of calcium aluminate hydrate CA04 indicates the absorption bands at 875 and 1420 cm −1 which are ascribed to the vibration modes of calcite The band at 543 and 549 cm −1 belong to the stretching vibration of Al–O bonds in the AlO 6 octahedral
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Characterization of Hydrated Aluminas by Infrared
Infrared spectra of interaction products in the Na2O Al2O3 SiO2 Fe2O3 TiO2 H2O system and bayer red slimes Journal of Applied Spectroscopy 1970 13 2
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Calcium Fluoride and Barium Fluoride Crystals in Optics
visible range up to the mid infrared wavelength range Calcium fluoride in deep UV applications Calcium fluoride crystals synthetically grown from highly purified CaF 2 pow der are a high performance optical ma terial The extremely high purity of the material enables an internal transmis sion of > 99 7 at the critical wavelength of 193 nm
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Optical and Physical Properties of Some Calcium Aluminate
Calcium aluminate glasses containing alkali oxides and iron oxide will transmit infrared radiation to about 6 μ and still have satisfactory working properties Their refractive index density expansion Young s modulus modulus of rupture fracture velocity Knoop hardness and some electrical and chemical properties are evaluated
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Know Your Infrared Window TransmittanceIRISS
accuracy The research compared a Calcium Fluoride infrared window to a polymer based window Both windows were shown to have a 50 transmission rate when new After just two years in a non aggressive environment the transmission rate of the calcium fluoride window had dropped significantly The Simplified Transmittance Test Equipment
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Thermal analysis of blended cements SpringerLink
The mechanism reactions and microstructure of blended cements from mixtures of Portland cement PC calcium aluminate cement CAC and calcium sulfate C bar text S are very complex 1–4 At early ages the hydration processes are dominated by the formation of ettringite AFt the PC/CAC mixtures the sulfates react with the aluminates present in both PC and CAC
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Infrared absorption spectra of some experimental glasses
ing some rare earth and other coloring oxides All glasses were made with the same basic compo ition namely Si02 7l 4 percent Na20 18 4 percent and CaO 10 2 percent as computed from the batch materials Calcium and anhydrous sodium carbonate of reagent quality and powdered crystal line quartz were employed for the base glass The
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Optomechanical Properties of Infrared Materials
infrared spectrum But because of the wide range of properties available in this limited list we do have enough variety to produce working systems What is of importance is the availability of some of these materials and their associated costs Some materials are very expensive when sold by weight for example germanium and zinc selenide Others
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Infrared absorption spectra of some experimental glasses
Infrared Absorption Spectra of Some Experimental Glasses Containing Rare Earth and Other Oxides By Ralph Stair and Conrad A F aick This paper gives specLral Lransmi ion data on soda lime glass containing rare earth Y PI Nd Sm Cd Er or oLher coloring oxi les V Cr Mn Co Ni U in the spectral Calcium and anhydrous sodium
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The Correct Material for Infrared IR Applications
The Importance of Using the Correct Material Since infrared light is comprised of longer wavelengths than visible light the two regions behave differently when propagating through the same optical medium Some materials can be used for either IR or visible applications most notably fused silica BK7 and sapphire however the performance of
Get PriceCharacterization of Hydrated Aluminas by Infrared
This article is cited by 76 publications Raffaella Demichelis Yves Noël Piero Ugliengo Claudio M Zicovich Wilson and Roberto Dovesi Physico Chemical Features of Aluminum Hydroxides As Modeled with the Hybrid B3LYP Functional and Localized Basis Functions
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PREPARATION AND CHARACTERIZATION OF DICALCIUM
DICALCIUM ALUMINATE HYDRATE C2AH8 Tomisla CZYKa Faculty of Chemical Engineer of Zagreb Croatia Introduction dTG 2 th of calcium 2 8 Materials m aluminate CA and mayenite → C2AH8 C12 H8 or the 12 products were investigated by X ray Results v MATUSINOVIĆa Juraj ŠIPUŠIĆa Boris ZIMMERMANNb Neven UKRAIN a ing and Technology University
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10 Things You Need To Know About Infrared Windows
About Infrared Windows See What Yo u ve Been Missing 10 Things It must also be compatible with the infrared equipment being used Some IR windows are simply a housing with an open center and a cover that secures the opening Typically the IR window housing will contain a grill or an optic refraction and decreasing transmittance
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Calcite R050128RRUFF Database Raman X ray Infrared
Carlson E T Berman H A 1960 Some observations on the calcium aluminate carbonate hydrates Journal of Research of the National Bureau of StandardsA Physics and Chemistry 64A Porto S P S Giordmaine J A Damen T C 1966 Depolarization of Raman scattering in calcite Physical Review 147
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Synthesis and characterization of some calcium aluminate
This work aimed to synthesize and characterize some calcium aluminate phases via sol–gel method These phases were produced by mixing calcium and aluminum nitrates salts Ca NO 3 2 4 H 2 O Al NO 3 3 9 H 2 O which have been used as starting raw materials to prepare nano oxides composite of CaO as well as Al 2 O 3 in different molar ratio for synthesizing CA C 2 A and C 3 A
Get PriceInfrared Spectroscopy in the Analysis of Building and
materials by infrared More recent studies in relation with the calcium aluminates cements were reported by Vázquez 1993 Later on different papers have present some characterization of materials and evolution over several exposition conditions using the infrared spectroscopy as a complementary technique join to mainly XRD and SEM analytical
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OSA Infrared Transmittance of Optical Materials at Low
Transmittance measurements of a variety of infrared optical materials were made at approximate temperatures of 50°K 85°K and 300°K in the 1 0 μ to 15 0 μ wavelength region The effects of these low temperatures on transmittance are presented in the form of curves with transmittance as a function of wavelength
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Infrared Spectroscopy in the Analysis of Building and
calcium aluminate cements Also the hydration of Portland cement and its constituents was developed by Bensted 1974 After that initial period several reports have been done in the study on cementitious materials by infrared More recent studies in relation with the calcium aluminates cements were reported by Vázquez 1993
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Infrared Spectroscopy of Calcium Aluminium rich Inclusions
We have performed infrared spectroscopy of meteoritic calcium aluminum rich inclusions CAIs from the CV chondrites Leoville and Allende While some previous studies have focused on the wavelength range λ lt25 μm we aimed at a detection and identification of CAI bands at wavelengths from 6 to 75 μm The resulting spectra have been compared with laboratory mineral spectra of typical CAI
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Study on the Influence of Mineralizer on the Preparation
The prepared calcium aluminates can be directly used for the production of polyaluminiumchloride PAC polymeric aluminum sulfate sodium aluminate and some other water treatment agents The calcium aluminates preparation technology was optimized by investigating the mass ratio of raw materials bauxiteand calcium carbonate and mineralizer
Get Price2 2 24 Absorption spectrophotometry infrared
SPECTROPHOTOMETRY INFRARED Infrared spectrophotometers are used for recording spectra in the region of cm−1 2 5 15 4 µm or in some cases down to 200 cm−1 50 µm APPARATUS Spectrophotometers for recording spectra consist of a suitable light source monochromator or interferometer and detector
Get PriceInfrared transmittance of some calcium aluminate and
The infrared transmittance of some calcium aluminate and germanate glasses has becn measured out to 6 microns The range of compositions of the calcium aluminate glasses was CaO 26 7 to 52 0 pOl cent and A1z03 28 2 to 49 6 perccnt Barium oxide BeO Bi203
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