Focus on spectral sensing and optoelectronic application systems
The iSphere-LPS series belongs to the standard integrating sphere of LiSen Optics. Users can choose the size of the integrating sphere and the size of the aperture according to their needs. Simultaneously, the LPS standard integrating sphere can be configured with a variety of optical accessories: light source, PD detector, filter, shrinkage hole, optical fiber interface, collimating lens, etc,which can satisfy the application of spectral radiation calibration, luminous flux calibration, transmission reflection and other optical applications.
The iSphere-LPS series belongs to the standard integrating sphere of LiSen Optics. Users can choose the size of the integrating sphere and the size of the aperture according to their needs. Simultaneously, the LPS standard integrating sphere can be configured with a variety of optical accessories: light source, PD detector, filter, shrinkage hole, optical fiber interface, collimating lens, etc,which can satisfy the application of spectral radiation calibration, luminous flux calibration, transmission reflection and other optical applications.
Integrating spheres and accessories
Technical Advantages and Features
● Flexibility
LiSen Optics' iSphere-LPS standard integrating sphere is more flexible than other integrating spheres, while, users can freely choose the size of the integrating sphere, the opening port and the diffuse reflection coating which reaches up to 98%. Optical components like light source, PD detector, filter, shrinkage device, optical fiber interface, collimating lens group can be configured to satisfy various optical measurement applications.
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Reflectance spectrogram of integrating sphere |
Reflectance spectrogram of gold-plated integrating sphere |
● User-Friendliness
LiSen Optics Integrating spheres and optical accessories can easily satisfy the customized needs of users. The iSphere-LPS standard integrating ball features a perfect opening port structure allowing quick installation and replacement of accessories,etc, which can satisfy the different application requirements of users.
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Integrating spheres and accessories
Technical Advantages and Features
● Flexibility
LiSen Optics' iSphere-LPS standard integrating sphere is more flexible than other integrating spheres, while, users can freely choose the size of the integrating sphere, the opening port and the diffuse reflection coating which reaches up to 98%. Optical components like light source, PD detector, filter, shrinkage device, optical fiber interface, collimating lens group can be configured to satisfy various optical measurement applications.
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Reflectance spectrogram of integrating sphere |
Reflectance spectrogram of gold-plated integrating sphere |
● User-Friendliness
LiSen Optics Integrating spheres and optical accessories can easily satisfy the customized needs of users. The iSphere-LPS standard integrating ball features a perfect opening port structure allowing quick installation and replacement of accessories,etc, which can satisfy the different application requirements of users.
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Main Technical Indicators
Model |
iSphere-LPS |
Integrating Sphere Inside Diameter |
2-6 inches |
Diffuse Reflective Material |
≥98% |
Numbers of Ports |
Three ports: there are two ports at the equator of integrating sphere at 0° and 90°, with additional port at the top Four ports:the additional opening is located opposite the 0° opening |
Light Barrier |
The baffle is located between the 0° and 90° ports |
Light Source and Detector (Optional) |
Internal halogen lamp : 5 - 30 W External halogen lamp : 10-150W Detector: Silicon detector, germanium detector, indium gallium arsenic, MCT mid-infrared detector |
Other Accessories (Optional) |
Aperture reducer , Optical fiber adapter , Optical filter, filter adapter, cosine diffuser assembly, Collimator lens assembly, Mounting bracket and base assembly, Aperture adapter |
Calibration |
Total spectral flux calibration, radiation calibration, exit uniformity |
Main Technical Indicators
Model |
iSphere-LPS |
Integrating Sphere Inside Diameter |
2-6 inches |
Diffuse Reflective Material |
≥98% |
Numbers of Ports |
Three ports: there are two ports at the equator of integrating sphere at 0° and 90°, with additional port at the top Four ports:the additional opening is located opposite the 0° opening |
Light Barrier |
The baffle is located between the 0° and 90° ports |
Light Source and Detector (Optional) |
Internal halogen lamp : 5 - 30 W External halogen lamp : 10-150W Detector: Silicon detector, germanium detector, indium gallium arsenic, MCT mid-infrared detector |
Other Accessories (Optional) |
Aperture reducer , Optical fiber adapter , Optical filter, filter adapter, cosine diffuser assembly, Collimator lens assembly, Mounting bracket and base assembly, Aperture adapter |
Calibration |
Total spectral flux calibration, radiation calibration, exit uniformity |
Typical Application
● Chroma and luminance measurement
● Light source radiation measurement
● Laser power measurement
● Transmission and reflection measurement
● Material fluorescence analysis
● Photoinduced/electroluminescent quantum efficiency
Integrating Sphere and Accessories (The following accessories can be equipped with all Integrating sphere)
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Integrating sphere |
Gold-plated Integrating sphere |
Port Reducer |
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Plugger |
Gold-plated plugger |
Collimating lens |
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Integrating sphere detector |
External halogen light source |
Built-in halogen light source |
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Fiber optic adapter |
● Including a Stand rod, base, making it up and down adjustable. |
Typical Application
● Chroma and luminance measurement
● Light source radiation measurement
● Laser power measurement
● Transmission and reflection measurement
● Material fluorescence analysis
● Photoinduced/electroluminescent quantum efficiency
Integrating Sphere and Accessories (The following accessories can be equipped with all Integrating sphere)
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Integrating sphere |
Gold-plated Integrating sphere |
Port Reducer |
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Plugger |
Gold-plated plugger |
Collimating lens |
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Integrating sphere detector |
External halogen light source |
Built-in halogen light source |
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Fiber optic adapter |
● Including a Stand rod, base, making it up and down adjustable. |
Model Selection Guide
iSphere-LPS XX -GD-3/4 (XX stands for integrating sphere size sampling “ 2 “,” 3.3 “,” 4 “,” 5.3 “,” 6 “,GD stands for gold plated, no GD defaults to PTFE, number 3 stands for 3 ports, 4 stands for 4 ports)
Integrating Sphere and Accessories |
Model |
Notes |
2 Inches Universal Standard Integrating Sphere (3 Ports) |
iSphere-LPS50-3 |
3 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction two ports, the third opening at the top, the baffle is located between 0° and 90° opening, integrating sphere inside diameter size 2 inches, 0° opening diameter 1 inch, 90° opening 0.5 inches, 180° opening 0.5 inches, the North Pole opening is 0.5 inches in diameter |
3.3 Inches Universal Standard Integrating Sphere (3 Ports) |
iSphere-LPS84-3 |
3 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction two ports, the third opening at the top, the baffle is located between 0° and 90° opening, integrating ball inside diameter 3.3 inches, 0° opening diameter 1.5 inches, 90° opening 1 inch, 180° opening 1 inch, the North Pole opening 1 inch in diameter |
4 Inches Universal Standard Integrating Sphere (3 Ports) |
iSphere-LPS100-3 |
3 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction two ports, the third opening at the top, the baffle is located between 0° and 90° opening, integrating ball inside diameter size 4 inches, 0° opening diameter 1.5 inches, 90° opening 1 inch, 180° opening 1 inch, the North Pole opening 1 inch in diameter |
5.3 Inches Universal Standard Integrating Sphere (3 Ports) |
iSphere-LPS135-3 |
3 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the baffle is located between 0° and 90° opening, integrating ball diameter 5.3 inches, 0° opening diameter 2.5 inches, 90° opening 1 inch, 180° opening 1 inch, the North Pole opening 1 inch in diameter |
6 Inches Universal Standard Integrating Sphere (3 Ports) |
iSphere-LPS150-3 |
3 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the baffle is located between 0° and 90° opening, integrating ball diameter 6 inches, 0° opening diameter 2.5 inches, 90° opening 1 inch, 180° opening 1 inch, the North Pole opening 1 inch in diameter |
2 Inches Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS50-4 |
4 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the fourth opening is located opposite the 0° opening, the baffle is located between 0° and 90° opening, integrating sphere diameter 2 inches, 0° opening diameter 1 inch, 90° opening 0.5 inches, 180° opening 0.5 inches,the North Pole opening 0.5 inches diameter |
3.3 Inches Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS84-4 |
4 port integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the fourth opening is located opposite the 0° opening, the baffle is located between 0° and 90° opening, integrating sphere diameter 3.3 inches, 0° opening diameter 1.5 inches, 90° opening 1 inch, 180° opening 1 inch ,the North Pole opening 1 inch diameter |
4 Inches Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS100-4 |
4 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the fourth opening is located opposite the 0° opening, the baffle is located between 0° and 90° opening, integrating sphere diameter 4 inches, 0° opening diameter 1.5 inches, 90° opening 1 inch, 180° opening 1 inch ,the North Pole opening 1 inch diameter |
5.3 Inches Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS135-4 |
4 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the fourth opening is located opposite the 0° opening, the baffle is located between 0° and 90° opening, integrating sphere diameter 5.3 inches, 0° opening diameter 2.5 inches, 90° opening 1 inch, 180° opening 1 inch ,the North Pole opening 1 inch diameter |
6 Inches Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS150-4 |
4 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the fourth opening is located opposite the 0° opening, the baffle is located between 0° and 90° opening, integrating sphere diameter 6 inches, 0° opening diameter 2.5 inches, 90° opening 1 inch, 180° opening 1 inch ,the North Pole opening 1 inch diameter |
2 Inches Gold-Plated Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS50-GD-4 |
4 ports gold-plated integrating sphere, gold-plated high reflectance > 96%, spectral range 1-16μm, two ports in the direction of 0° and 90° equator of the integrating sphere, the third opening at the top, the fourth opening opposite the 0° opening, the baffle between 0° and 90° opening, the inside diameter of the integrating sphere is 2 inches, the diameter of the 0° opening is 1 inch, and the 90° opening is 0.5 inches. 180° opening 0.5 inches , the North Pole opening 0.5 inches diameter |
3.3 Inches Gold-Plated Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS84-GD-4 |
4 ports gold-plated integrating sphere, gold-plated high reflectance > 96%, spectral range 1-16μm, two ports in the direction of 0° and 90° equator of the integrating sphere, the third opening at the top, the fourth opening opposite the 0° opening, the baffle between 0° and 90° opening, the inside diameter of the integrating sphere is 3.3 inches, the diameter of the 0° opening is 1.5 inches, and the 90° opening is 1 inch. 180° opening 1 inch , the North Pole opening 1 inch diameter |
4 Inches Gold-Plated Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS100-GD-4 |
4 ports gold-plated integrating sphere, gold-plated high reflectance > 96%, spectral range 1-16μm, two ports in the direction of 0° and 90° equator of the integrating sphere, the third opening at the top, the fourth opening opposite the 0° opening, the baffle between 0° and 90° opening, the inside diameter of the integrating sphere is 4 inches, the diameter of the 0° opening is 1.5 inches, and the 90° opening is 1 inch. 180° opening 1 inch , the North Pole opening 1 inch diameter |
5.3 Inches Gold-Plated Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS135-GD-4 |
4 ports gold-plated integrating sphere, gold-plated high reflectance > 96%, spectral range 1-16μm, two ports in the direction of 0° and 90° equator of the integrating sphere, the third opening at the top, the fourth opening opposite the 0° opening, the baffle between 0° and 90° opening, the inside diameter of the integrating sphere is 5.3 inches, the diameter of the 0° opening is 2.5 inches, and the 90° opening is 1 inch. 180° opening 1 inch , the North Pole opening 1 inch diameter |
6 Inches Gold-Plated Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS150-GD-4 |
4 ports gold-plated integrating sphere, gold-plated high reflectance > 96%, spectral range 1-16μm, two ports in the direction of 0° and 90° equator of the integrating sphere, the third opening at the top, the fourth opening opposite the 0° opening, the baffle between 0° and 90° opening, the inside diameter of the integrating sphere is 6 inches, the diameter of the 0° opening is 2.5 inches, and the 90° opening is 1 inch. 180° opening 1 inch , the North Pole opening 1 inch diameter |
Plugger |
LPS-PDK-1 |
Port plug, 1 inch integrating sphere plug (also available on request), internal diffuse reflective PTFE |
Gold-Plated Plugger |
LPS-GDK-1 |
Port plug, 1 inch integrating sphere plug (also available on request), internal diffuse gold plating |
Hole Shrinker |
LPS-PSK-XX |
Can be directly coupled with the integral sphere using the opening, no step indentation diameter default for 10mm or 25mm (can also be customized according to requirements), other indentation diameter can be selected according to user requirements internal diffuse reflective PTFE |
Collimation Lens |
LPS-FOL |
Directly coupled integrating sphere collimator lens, focal length 8.7mm, interface standard SMA905 |
Fiber Optic Adapter |
LPS-XX |
Integrating sphere fiber optic interface adapter, interface SMA905, FC/PC, SC, ST interface, default is SMA905 |
Built-in Halogen Light Source |
LPS-HAL-AXX |
Integrating sphere with built-in halogen light source, power output of 5-30W |
External Halogen Light Source |
LPS-HAL-BXX |
Integrating sphere external halogen light source, power output 5-30W |
Integrating Sphere Detecto |
LPS-PWR-XX |
Silicon detectors, spectral range 350-1100nm, direct coupling with integrating sphere, BNC output interface; |
Stand Base |
LPS-DZ-1 |
Including bracket support bar, base, up and down adjustable |
Model Selection Guide
iSphere-LPS XX -GD-3/4 (XX stands for integrating sphere size sampling “ 2 “,” 3.3 “,” 4 “,” 5.3 “,” 6 “,GD stands for gold plated, no GD defaults to PTFE, number 3 stands for 3 ports, 4 stands for 4 ports)
Integrating Sphere and Accessories |
Model |
Notes |
2 Inches Universal Standard Integrating Sphere (3 Ports) |
iSphere-LPS50-3 |
3 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction two ports, the third opening at the top, the baffle is located between 0° and 90° opening, integrating sphere inside diameter size 2 inches, 0° opening diameter 1 inch, 90° opening 0.5 inches, 180° opening 0.5 inches, the North Pole opening is 0.5 inches in diameter |
3.3 Inches Universal Standard Integrating Sphere (3 Ports) |
iSphere-LPS84-3 |
3 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction two ports, the third opening at the top, the baffle is located between 0° and 90° opening, integrating ball inside diameter 3.3 inches, 0° opening diameter 1.5 inches, 90° opening 1 inch, 180° opening 1 inch, the North Pole opening 1 inch in diameter |
4 Inches Universal Standard Integrating Sphere (3 Ports) |
iSphere-LPS100-3 |
3 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction two ports, the third opening at the top, the baffle is located between 0° and 90° opening, integrating ball inside diameter size 4 inches, 0° opening diameter 1.5 inches, 90° opening 1 inch, 180° opening 1 inch, the North Pole opening 1 inch in diameter |
5.3 Inches Universal Standard Integrating Sphere (3 Ports) |
iSphere-LPS135-3 |
3 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the baffle is located between 0° and 90° opening, integrating ball diameter 5.3 inches, 0° opening diameter 2.5 inches, 90° opening 1 inch, 180° opening 1 inch, the North Pole opening 1 inch in diameter |
6 Inches Universal Standard Integrating Sphere (3 Ports) |
iSphere-LPS150-3 |
3 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the baffle is located between 0° and 90° opening, integrating ball diameter 6 inches, 0° opening diameter 2.5 inches, 90° opening 1 inch, 180° opening 1 inch, the North Pole opening 1 inch in diameter |
2 Inches Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS50-4 |
4 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the fourth opening is located opposite the 0° opening, the baffle is located between 0° and 90° opening, integrating sphere diameter 2 inches, 0° opening diameter 1 inch, 90° opening 0.5 inches, 180° opening 0.5 inches,the North Pole opening 0.5 inches diameter |
3.3 Inches Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS84-4 |
4 port integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the fourth opening is located opposite the 0° opening, the baffle is located between 0° and 90° opening, integrating sphere diameter 3.3 inches, 0° opening diameter 1.5 inches, 90° opening 1 inch, 180° opening 1 inch ,the North Pole opening 1 inch diameter |
4 Inches Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS100-4 |
4 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the fourth opening is located opposite the 0° opening, the baffle is located between 0° and 90° opening, integrating sphere diameter 4 inches, 0° opening diameter 1.5 inches, 90° opening 1 inch, 180° opening 1 inch ,the North Pole opening 1 inch diameter |
5.3 Inches Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS135-4 |
4 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the fourth opening is located opposite the 0° opening, the baffle is located between 0° and 90° opening, integrating sphere diameter 5.3 inches, 0° opening diameter 2.5 inches, 90° opening 1 inch, 180° opening 1 inch ,the North Pole opening 1 inch diameter |
6 Inches Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS150-4 |
4 ports integrating sphere, PTFE high reflectance > 98%, spectral range 200-2500nm, integrating sphere equator 0° and 90° direction of two ports, the third opening at the top, the fourth opening is located opposite the 0° opening, the baffle is located between 0° and 90° opening, integrating sphere diameter 6 inches, 0° opening diameter 2.5 inches, 90° opening 1 inch, 180° opening 1 inch ,the North Pole opening 1 inch diameter |
2 Inches Gold-Plated Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS50-GD-4 |
4 ports gold-plated integrating sphere, gold-plated high reflectance > 96%, spectral range 1-16μm, two ports in the direction of 0° and 90° equator of the integrating sphere, the third opening at the top, the fourth opening opposite the 0° opening, the baffle between 0° and 90° opening, the inside diameter of the integrating sphere is 2 inches, the diameter of the 0° opening is 1 inch, and the 90° opening is 0.5 inches. 180° opening 0.5 inches , the North Pole opening 0.5 inches diameter |
3.3 Inches Gold-Plated Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS84-GD-4 |
4 ports gold-plated integrating sphere, gold-plated high reflectance > 96%, spectral range 1-16μm, two ports in the direction of 0° and 90° equator of the integrating sphere, the third opening at the top, the fourth opening opposite the 0° opening, the baffle between 0° and 90° opening, the inside diameter of the integrating sphere is 3.3 inches, the diameter of the 0° opening is 1.5 inches, and the 90° opening is 1 inch. 180° opening 1 inch , the North Pole opening 1 inch diameter |
4 Inches Gold-Plated Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS100-GD-4 |
4 ports gold-plated integrating sphere, gold-plated high reflectance > 96%, spectral range 1-16μm, two ports in the direction of 0° and 90° equator of the integrating sphere, the third opening at the top, the fourth opening opposite the 0° opening, the baffle between 0° and 90° opening, the inside diameter of the integrating sphere is 4 inches, the diameter of the 0° opening is 1.5 inches, and the 90° opening is 1 inch. 180° opening 1 inch , the North Pole opening 1 inch diameter |
5.3 Inches Gold-Plated Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS135-GD-4 |
4 ports gold-plated integrating sphere, gold-plated high reflectance > 96%, spectral range 1-16μm, two ports in the direction of 0° and 90° equator of the integrating sphere, the third opening at the top, the fourth opening opposite the 0° opening, the baffle between 0° and 90° opening, the inside diameter of the integrating sphere is 5.3 inches, the diameter of the 0° opening is 2.5 inches, and the 90° opening is 1 inch. 180° opening 1 inch , the North Pole opening 1 inch diameter |
6 Inches Gold-Plated Universal Standard Integrating Sphere (4 Ports) |
iSphere-LPS150-GD-4 |
4 ports gold-plated integrating sphere, gold-plated high reflectance > 96%, spectral range 1-16μm, two ports in the direction of 0° and 90° equator of the integrating sphere, the third opening at the top, the fourth opening opposite the 0° opening, the baffle between 0° and 90° opening, the inside diameter of the integrating sphere is 6 inches, the diameter of the 0° opening is 2.5 inches, and the 90° opening is 1 inch. 180° opening 1 inch , the North Pole opening 1 inch diameter |
Plugger |
LPS-PDK-1 |
Port plug, 1 inch integrating sphere plug (also available on request), internal diffuse reflective PTFE |
Gold-Plated Plugger |
LPS-GDK-1 |
Port plug, 1 inch integrating sphere plug (also available on request), internal diffuse gold plating |
Hole Shrinker |
LPS-PSK-XX |
Can be directly coupled with the integral sphere using the opening, no step indentation diameter default for 10mm or 25mm (can also be customized according to requirements), other indentation diameter can be selected according to user requirements internal diffuse reflective PTFE |
Collimation Lens |
LPS-FOL |
Directly coupled integrating sphere collimator lens, focal length 8.7mm, interface standard SMA905 |
Fiber Optic Adapter |
LPS-XX |
Integrating sphere fiber optic interface adapter, interface SMA905, FC/PC, SC, ST interface, default is SMA905 |
Built-in Halogen Light Source |
LPS-HAL-AXX |
Integrating sphere with built-in halogen light source, power output of 5-30W |
External Halogen Light Source |
LPS-HAL-BXX |
Integrating sphere external halogen light source, power output 5-30W |
Integrating Sphere Detecto |
LPS-PWR-XX |
Silicon detectors, spectral range 350-1100nm, direct coupling with integrating sphere, BNC output interface; |
Stand Base |
LPS-DZ-1 |
Including bracket support bar, base, up and down adjustable |