Integrating Spheres

With over 40 years of experience in designing integrating spheres, Gamma Scientific has the expertise to build custom integrating spheres and sphere systems to meet your testing requirements.

Gamma Scientific integrating spheres are available in a wide range of sizes from 25mm to 3m in diameter. Multi-purpose integrating spheres provide maximum flexibility and are custom built to meet your exact testing requirements. Light measurement spheres for LED testing are optimized for capturing total flux measurements of LED lamps and luminaires.

All spheres come with your choice of coating. Choose from our proprietary polytetra-fluoroethylene (PTFE) or a specially formulated barium-sulfate coating. The PTFE coating gives > 99% reflectance over the UV/VIS/NIR region, and is almost perfectly Lambertian. Our barium-sulfate coating is lightweight and rugged offering a highly diffuse reflectance of 95% over the UV/VIS/NIR region.

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Testing Applications
  • LED and SSL (Solid State Lighting) Measurement
  • Laser Power Measurement
  • Fiber-Optic Testing
  • Automotive Lighting
  • Standard Lamps and Bulbs
  • Architectural Lighting
  • Photometric and Radiometric Measurements
  • As a Uniform Light Source
Measurement Capabilities
  • Total Luminous Flux
  • Optical Power Measurements

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Multi-Purpose Integrating Spheres

Multi-Purpose Integrating Spheres from Gamma Scientific have been designed to provide maximum flexibility for a wide range of testing applications. With multi-purpose integrating spheres we can quickly build a custom sphere to meet your exact test requirements.

Get started by choosing your required interior diameter size, reflectance coating material and port configuration. We will then custom build the integrating sphere based on your specific requirements. This ensures that you receive a sphere which is optimized for your exact test and measurement needs.

Multi-purpose integrating spheres can be coupled with Gamma Scientific spectroradiometers and photometers to create complete light measurement systems.

Light Measurement Integrating Spheres

2M Integrating Sphere in Laboratory 1500x1000
Light measurement spheres for LED testing are optimized for capturing total flux measurements of LED lamps and luminaires.

Light measurement spheres are available in a wide range of sizes from 25mm to 3m in diameter.

Light Measurement Sphere Specifications

Model Diameter Coating Internal Baffles
GS-IS1 1 inch / 25 mm PTFE or Barium Sulfate No
GS-IS1.5 1.5 inch / 38 mm PTFE or Barium Sulfate No
GS-IS4 4 inch / 100 mm PTFE or Barium Sulfate Yes
GS-IS6 6 inch / 150 mm PTFE or Barium Sulfate Yes
GS-IS8 8 inch / 150 mm PTFE or Barium Sulfate Yes
GS-IS12 12 inch / 300 mm Barium Sulfate Yes
GS-IS12-TLS-H 12 inch / 300 mm Barium Sulfate Yes
GS-IS20 20 inch / 500 mm Barium Sulfate Yes
GS-IS40 40 inch / 1000 mm Barium Sulfate Yes
GS-IS60 60 inch / 1500 mm Barium Sulfate Yes
GS-IS80 80 inch / 2000 mm Barium Sulfate Yes

Standard Port Locations

2 Port 0° and North Pole or 0° and 90°
3 Port 0°, 90° and North Pole
4 Port 0°, 90°, 270° and North Pole
5 Port 0°, 90°, 180°, 270° and North Pole

Multi-Purpose Integrating Sphere Specifications

Model Number Diameter(in) Coating Entrance
90° North Pole 180°
GS-IS-010-MP-3P-B 1 Barium Sulfate 0.25 0.25 0.25
GS-IS-010-MP-3P-T 1 Teflon(PTFE) 0.25 0.25 0.25
GS-IS-010-MP-4P-B 1 Barium Sulfate 0.25 0.25 0.25 0.25
GS-IS-010-MP-4P-T 1 Teflon (PTFE) 0.25 0.25 0.25 0.25
GS-IS-020-MP-3P-B 2 Barium Sulfate 1.00 0.50 0.50
GS-IS-020-MP-3P-T 2 Teflon(PTFE) 1.00 0.50 0.50
GS-IS-020-MP-4P-B 2 Barium Sulfate 1.00 0.50 0.50 0.50
GS-IS-020-MP-4P-T 2 Teflon(PTFE) 1.00 0.50 0.50 0.50
GS-IS-040-MP-3P-B 4 Barium Sulfate 1.50 1.00 1.00
GS-IS-040-MP-3P-T 4 Teflon(PTFE) 1.50 1.00 1.00
GS-IS-040-MP-4P-B 4 Barium Sulfate 1.50 1.00 1.00 1.00
GS-IS-040-MP-4P-T 4 Teflon(PTFE) 1.50 1.00 1.00 1.00
GS-IS-060-MP-3P-B 6 Barium Sulfate 2.50 1.00 1.00
GS-IS-060-MP-3P-T 6 Teflon(PTFE) 2.50 1.00 1.00
GS-IS-060-MP-4P-B 6 Barium Sulfate 2.50 1.00 1.00 1.00
GS-IS-060-MP-4P-T 6 Teflon(PTFE) 2.50 1.00 1.00 1.00

Integrating Sphere Technology

The integrating sphere is a fundamental optical technology, commonly used in photometry and radiometry, for applications including the test and measurement of light sources (lamps, LEDs, lasers, fiber-optic illuminators), sensors (focal-plane arrays, spectrometers, and camera systems), and material properties (reflectance and transmittance).

In the most general terms, an integrating sphere consists of a spherical shell, with a diffuse white (and therefore highly reflective) optical coating on its inside surface. Ports or apertures in the sphere wall admit or release light, which undergoes multiple diffuse reflections within the sphere cavity. Such reflection serves to spatially homogenize the light passing through the sphere, attenuating the optical signal significantly in the process. Typically, one or more baffles within the sphere cavity are positioned strategically to shield system components from undesired direct illumination, thereby enhancing sphere performance.

Though specific attributes vary with application, an integrating sphere is generally used to perform the following functions

  • Collection of light – from some type of source
  • Spatial averaging (homogenization)
  • Illumination – of some type of sensor or specimen

Key Design Specifications

  • Sphere diameter
  • Number of ports
  • Port dimensions and location
  • Baffle position(s) and function(s)
  • Mechanical interfaces: Port adaptors, mounting fixtures, etc.

Key Performance Specifications

  • Spectral reflectance of coating
  • Thermal and environmental stability of coating
  • Uniformity/Homogeneity
  • Attenuation or efficiency

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