819D 3-Port sphere port locations. Note that a 2 sphere shell is cubic.
819C 4-Port sphere port locations. Note that a 2 sphere shell is cubic.New! Gold spheres ideal for mid-IR wavelength applications are now available
Total collection of light and spatial integration
Measurements insensitive to exact detector positioning
Signal attenuation through multiple bounces in high reflectance coating
Thermally stable
819D 3-Port sphere port locations. Note that a 2 sphere shell is cubic.819C 4-Port sphere port locations. Note that a 2 sphere shell is cubic.
Newport\'s 819C (4 port spheres) and 819D (3 port) Series Integrating Spheres are offered in sizes ranging from 2” to 6” in diameter. With three different types of diffuse reflectance materials, they are designed to provide greater configuration flexibility. Note that some spheres are shipped with either a port plug or a port reducer, which can easily be removed as required.
Typical Characteristics for Sphere Coatings
Newport provides three different types of inner-sphere meterials to meet various requirements of users: PTFE, barium sulfate, and diffused gold.
The barium sulfate coating has an effective range from 300 nm to 2400 nm, with reflectivity of >97% at 600 nm. It is a cost effective and adequate for most radiation measurement applications. The unmatched environmental stability and high-performance of the Spectralon™ based spheres are derived from their rugged monolithic thermoplastic material and are superior to coated integrating spheres. In addition, their high damage threshold surface can be cleaned with distilled water.
Hydrophobic, chemically inert and thermally stable to 350°C, PTFE based Spheres can be used in more demanding environments, including underwater and high or low temperature processes. At the same time, reflectance exceeding 95% from 250–2500 nm, 98% from 310–2100 nm, and 99% from 400–1500 nm make them ideal for even the most demanding measurements from the ultraviolet to the near infrared.
The gold coated spheres are optimized to provide high level of diffuse reflectance from the longer 800 nm to 20 um (>90% at 800 nm, >94% at 1550 nm) wavelength range. Its damage threshold is 4 times greater than PTFE. Their reflectance characteristics are superior in longer IR region to the existing barium sulfate of PTFE type integrating spheres, making them an ideal sphere for the mid to far IR applications. High damage threshold and high thermal limit characteristics make the gold spheres a choice for high power applications as well.
Accessory products are available not only in PTFE, barium sulfate, or gold, but also in Flat Black type coating in some cases. Flat Black type highly absorbs light and is used to imitate an open port, which does not have any reflection, but to reduce introduction of ambient light into the sphere.
Various types of sphere accessories with different types of reflectance materials are available with Newport Corporation. We recommend to use the accessories that have the same reflective materials as in the sphere itself, if available. For more information please see Integrating Sphere Accessories.