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Newport offers families of specialty integrating spheres in various sizes, with three coating types to cover UV to NIR wavelengths. Integrating spheres are ideal optical diffusers and are spatially insensitive when collecting energy, ensuring reproducible radiometric measurements are achieved. They are used for reflectance and transmittance measurements, uniform radiance/irradiance fields for testing sensors, or even to mix two light sources.
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, with greater than 97% reflectance at visible wavelengths.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 near-Lambertian 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.
The excellent reflectance properties of these spheres give them a high damage threshold. Measurements with a pulsed laser at 1.6 µm 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.
Place one of these integrating spheres at the output of a light source to create a uniform Lambertian broadband emitter. These spheres are utilized in applications where uniformity is critical. Typical radiance uniformity is within 1-2% of the average over the exit port as long as the field of view of the imaging system remains aimed at 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. 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. These models feature an 8-inch interior diameter. The input port of each sphere has a standard Oriel 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, allowing samples to be easily mounted. Use a model 77829 coupling ring to connect these spheres to an Oriel monochromator.
The 70679NS and 70682NS are used for measurement of specular and diffuse hemispherical reflectance and total transmittance using an 8/D geometry (8-degree beam incidence/diffuse collection). The 70679NS may be used from 350 to 1300 nm and has an 8-inch diameter. The 70682NS functions from 250 to 2500 nm, with a 7-inch inner diameter. These spheres have five ports:
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