1354 MINIS Oriel Integrating Spheres Integrating spheres are ideal optical diffusers; they are used for radiometric measurements where uniform illumination or angular collection is essential, for reflectance and transmittance measurements, or even to mix two light sources. We offer five families of integrating spheres in sizes from 2 to 8 inches (51 to 203 mm), with three coating types to cover the following spectral ranges: Barium Sulfate for 350 1300 nm PTFE for 250 2500 nm Diffuse Gold for 7.5 10 mm How Do Integrating Spheres Work? Fig. 1 shows the principle of operation of integrating spheres. Light is collected by an integrating sphere and uniformly reflected and scattered around the sphere s interior so the output is a uniform, spatially integrated field (Lambertian) of radiation which is insensitive to the spatial, angular and polarization changes of the input. Our integrating spheres come with 1.5 Inch Series input and output flanges so they can be mounted to any of our Oriel instruments and components. Integrating Spheres Ideal diffusers; ensure reproducible radiometric measurements Spatially insensitive collection of energy Uniform radiance/irradiance fields for test of sensors 2 to 8 inch sphere sizes Coated with broadband, stable coatings: PTFE (250 2500 nm), BaSO 4 (350-1300 nm), Gold (7.5-10 mm) Why an Integrating Sphere? For critical radiometric measurements, always use an integrating sphere; they are close to ideal diffusers. Integrating spheres are considerably more expensive, and suffer similar or higher throughput losses than disk diffusers, but they provide a true cosine response and very repeatable uniform illumination of a spectrometer grating or detector. Disk diffusers are suitable for applications requiring relatively uniform illumination, such as detectors which are not uniformly sensitive across the photosensitive area. High Reflectance Most of our integrating spheres are available with a choice of three interior materials. For VIS-NIR applications choose our barium sulfate-based white coated spheres. The coating is highly reflective, >97% in the visible. For UV, VIS or NIR measurements, we offer spheres with interiors machined from a unique PTFE thermoplastic material that is very rugged and highly reflective down to 250 nm. For applications in the NIR and IR regions our diffuse gold spheres provide nearlambertian characteristics and reflectance values up to 95%. All of our spheres are designed to provide high reflectance, stability and low throughput loss over their usable wavelength range. High Damage Threshold S OUTPUT DIFFUSING BAFFLE Fig. 1 Principle of operation of an integrating sphere. The incoming beam is diffusely reflected inside an integrating sphere. The output port cannot see the region of first impact. The excellent reflectance of our spheres gives them a high damage threshold. Measurements with a pulsed laser at 1.6 mm showed the damage threshold of the coated spheres to be 1.5 W cm -2. The PTFE spheres have an even higher damage threshold of 8 W cm -2, and the gold spheres exhibit a damage threshold of 19 W cm -2. REFLECTANCE (%) 100 90 80 70 60 50 REFLECTANCE PTFE REFLECTANCE BaSO 4 40 30 THROUGHPUT PTFE 20 THROUGHPUT 10 BaSO 4 0 250 500 750 1000 1250 1500 1750 2000 2250 2500 WAVELENGTH (nm) Fig. 2 Reflectance and throughput of 4 inch PTFE and BaSO 4 Spheres. THROUGHPUT (%)
1355 REFLECTANCE (%) 100 98 96 94 92 90 5 6 7 8 9 10 WAVELENGTH (µm) Fig. 3 Reflectance of Diffuse Gold Which Sphere Do I Choose? GOLD We offer five integrating sphere designs with a choice of interior coatings covering the UV-VIS through the IR. Your choice is often a tradeoff between throughput and uniformity needs. For example, our 8 inch spheres give the most uniform output, but suffer the greatest throughput losses due to the large diameter of the sphere. Monochromator Spheres 2 inch interior diameter spheres designed for uniform monochromator, sensor and spectrograph illumination for VIS and NIR. Also used at the output of a monochromator, to uniformly illuminate a single detector or more than one detector. These spheres have excellent diffusing properties, proper baffling to prevent "first strike" radiation from entering the instrument. 1.5 Inch Series flanges and a tapped hole facilitate mounting. Fiber Optic Spheres 4 inch interior diameter integrating spheres for uniform illumination of fiber bundles, or creating a lambertian source with single or multiple fiber inputs Accept SMA fiber adapters (for ST adapters, contact a Sales Engineer) These spheres are a smaller version of the General Purpose Sphere. They are 4 inches in diameter, suitable for small light beams. There are three ports on the equator; two have 11 mm internal diameters to fit any Oriel Fiber Bundle directly. For SMA terminated fibers you will also need the 70463 Adapter. The third port is a 1.5 Inch Series male flange. General Purpose Spheres Available in 4 inch and 6 inch interior diameter sizes High lambertian diffuse coating These General Purpose Integrating Spheres are 4 and 6 inches (102 and 152 mm) in diameter. They include standard Oriel 1.5 Inch Series flanges and tapped holes for rod mounting. If you need to couple these spheres to instruments with male flanges (such as a monochromator), order the 77829 Coupling Ring. A diagram of the light path for the 70451 is shown in Fig. 1. Uniform Light Source Spheres 8 inch interior diameter 2 inch diameter output port For critical uniform illumination applications Turn a light source into an almost perfectly uniform Lambertian emitter Place one of these integrating spheres at the output of a light source and you have an almost perfectly uniform Lambertian, broadband source. Typical radiance uniformity is within 1-2% of the average over the 2 inch (51 mm) diameter exit port as long as the FOV of the imaging system stays on the baffle within the sphere. Irradiance uniformity at the port is also better than 1-2%. For a tunable, uniform light source, couple the sphere to the input of a monochromator (or motorized filter wheel). You'll need the 77829 Coupling Ring to attach one of these to an Oriel Monochromator. To make a uniform calibration source with several orders of luminance range, attach a filter wheel with neutral density filters to the sphere's input. The input port of the sphere has a 1.5 Inch Series male flange so it can be mated to an Oriel Light Source. The output port is a 2 inch (51 mm) diameter port frame for simple mounting of samples. Reflectance and Transmittance Spheres 8 inch interior diameter spheres For measurements of specular and diffuse hemispherical reflectance and total transmittance The 70679 and 70682 are for measurement of specular and diffuse hemispherical reflectance and total transmittance using a 8/D geometry (8 degree beam incidence/diffuse collection). The 70679 is good for the VIS-NIR regions and the 70682 is good for UV-VIR-NIR (Note the ID of the 70682 is ~7.0 ). The spheres have 5 ports: Input port with 1.5 inch series male flange 1.0 Inch sample port, in-line with input port Detector port with 1.5 inch series male flange MINIS S Accept a variety of port plugs and detector adapters 1.0 inch specular exclusion/inclusion port (for light trap or plug) Ideal for universal measurements and mixing two inputs for lambertian sources Additional 2.0 inch port at north pole for comparison measurement technique or center mounted samples (custom holder required; contact a Sales Engineer with your sample requirements). Email: sales@newport.com Web: newport.com
1356 A reflectance sample holder with 1 inch (25 mm) diameter, 0.5 inch (13 mm) deep cell holds the sample at 8 to the beam. The clear aperture is 0.7 inch (18 mm). The holder is spring loaded so that square, rectangular or irregular shapes with dimensions up to 2 inches (51 mm) can be held against the sphere wall. (The sample must fill the aperture.) The spring loading allows you to quickly insert and remove the sample and the 70496 White Spectral Calibration Disk. Light, which is reflected from the sample strikes the port and is turned 8 degrees to the specular exclusion port. If a plug is at the exclusion port, the light is re-captured in the sphere (specular inclusion total reflectance 8/D). If a light trap is used in the exclusion port, the specular portion of the sample s reflectance is subtracted from the measurement (Specular excluded diffuse only reflectance 8/D allows characterization of gloss ). One exclusion port plug is included with the sphere and one extra port plug is included for the north pole port. Conversely, if the 0 Sample Holder (also included with the 70679 and 70682 R/T Spheres) is used at the sample port and the input beam is placed behind the sample port, then you can qualify diffuse, normal or total transmittance of samples. If a plug is used at the 1.0 inch port opposite the sample (former input port), then all energy is included in the measurement (total transmittance). If a light trap is used at this port opposite the sample, then the normal transmitted beam (specular transmission) is excluded by the trap (diffuse or normal excluded transmittance allows haze characterizations). Ordering Information Integrating Spheres White Spectral Calibration Disk The 70496 is a 1.25 inch (30 mm) diameter, 11 mm thick white Zenith disk, for spectral calibration purposes. It has >95% reflectance from 250 to 2500 nm (>98% from 400-1800 nm), is durable, and is an almost perfect reflecting Lambertian diffuser. It may be lightly abraded to restore performance if it becomes dirty. The measured Hemispherical Reflectance Factor from 250 to 2500 nm is supplied for each disk. This calibration data is traceable to NIST. Accessories Model Description 70650 Port Plug, Barium Sulfate Coating, 0.5 inch 70651NS Port Plug, Barium Sulfate Coating, 1.0 inch 70652 Port Plug, Barium Sulfate Coating, 1.5 inch 70653 Port Plug, Barium Sulfate Coating, 2.0 inch 70654 Port Plug, PTFE Coating, 0.5 inch 70655 Port Plug, PTFE Coating, 0.5 inch 70656NS 70657NS Port Plug, PTFE Coating, 1.5 inch Port Plug, PTFE Coating, 2.0 inch 70658 Port Plug, Diffuse Gold Coating, 0.5 inch 70659 Port Plug, Diffuse Gold Coating, 1.0 inch 70660 Port Plug, Diffuse Gold Coating, 1.5 inch 70661 Port Plug, Diffuse Gold Coating, 2.0 inch 70463 Port Adapter, SMA Terminated Fiber 70496 White Spectral Calibration Disk, Reflectance/Transmittance Spheres 77829 Light Source Coupling Ring, 1.5 Inch Series, Double Female, Set Screw MINIS S Model Description 70665 Monochrometer Integrating Sphere, PTFE 250-2500 nm, 2 inch, (2) 1/2 inch Ports 70666 Monochrometer Integrating Sphere, Barium Sulfate 360-700 nm, 2 in, (2) 1/2 in Ports 70667 Monochrometer Integrating Sphere, Diffuse Gold 7.5-10mm, 2 in,(2)1/2 in Ports 70668 Fiber Optic Integrating Sphere, Barium Sulfate 360-700 nm, 4 in, (3) 1 in Ports 70669 Fiber Optic Integrating Sphere, PTFE 250-2500 nm, 4 inch, (3) 1 inch Ports 70670 Fiber Optic Integrating Sphere, Diffuse Gold 7.5-10 mm, 4 in, (3)1 in Ports 70671 General Purpose Integrating Sphere, Barium Sulfate 360-700 nm, 4 in, (3) 1 in Ports 70672 General Purpose Integrating Sphere, PTFE 250-2500 nm, 4 inch, (3) 1 inch Ports 70673 General Purpose Integrating Sphere, Diffuse Gold 7.5-10mm,4 in, (3)1 in Ports 70674 General Purpose Integrating Sphere, Barium Sulf. 350-1300 nm, 6 in, 3 1.5 in Ports 70675 General Purpose Integrating Sphere, PTFE 250-2500 nm, 6 in, (3) 1.5 in Ports 70676 General Purpose Integrating Sphere,Diffuse Gold 7.5-10mm,6 in,(3)1.5 in Ports 70677 Uniform Source Integrating Sphere, Barium Sulfate 350-1300 nm, 8 in, (3) 2 in Ports 70678 Uniform Source Integrating Sphere, Diffuse Gold 7.5-10 mm, 8 in, (3) 2 in Ports 70679NS Reflectance/Transmittance Sphere, Barium Sulfate 360-700 nm, 8 in, (5) 1&2 in Ports 70682NS Reflectance/Transmittance Sphere, PTFE 250-2500 nm, 8 in, (5) 1&2 in Ports *PTFE spheres aren t coated; they are machined from a thermoplastic material.
1357 Fig 4 Dimensional diagram of Monochromator Integrating Spheres. 70668 BARIUM SULFATE 70670 DIFFUSE GOLD 6.23 (158.2) 4.23 (107.4) FIBER OPTIC INTEGRATING SPHERES 70669 PTFE 11 mm FERRULE ADAPTER 11 mm FERRULE ADAPTER 2.44 (61.9) Fig 5 Dimensional diagram of Fiber Optic Integrating Spheres. MOUNTING 2.80 (71.1) MINIS S Fig 6 Dimensional diagram of General Purpose Integrating Spheres. Email: sales@newport.com Web: newport.com
1358 70677 BARIUM SULFATE 70678 DIFFUSE GOLD 8.73 (222) 8.23 (209) 2.0 INCH APERTURE WITH MOUNTING S LIGHT BAFFLE 4.39 (111.5) Fig 7 Dimensional diagram of Uniform Sources Integrating Spheres. LIGHT TRAP INTER- CHANGEABLE BEAM 70679 BARIUM SULFATE AND 70682PTFE R/T SPHERE IN TOTAL HEMISPHERICAL REFLECTANCE MODE SAMPLE HOLDER LIGHT TRAP 70679 BARIUM SULFATE AND 70682 PTFE R/T SPHERE IN TOTAL HEMISPHERICAL TRANSMITTANCE MODE INTERCHANGEABLE SAMPLE HOLDER BEAM MINIS Fig 8 Diagram of Reflectance/Transmittance Integrating Spheres. See our website WEB for more info S