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Uniform Integrating Sphere Light Source with tungsten halogen and UV LED based sources

Integrating sphere light source with homogeneous light field for applications of camera calibration based on LEDs and tungsten halogen lamp.
300 mm Ø sphere diameter, 63.5 mm Ø diameter port.
UV LED illuminant (UV or other like red, green, blue, white possible).
Remote or manual aperture for intensity adjustment.
Control electronics with precision power supplies.
Traceable calibration.

Integrating sphere light sources provide a luminous field with very good uniformity of the luminance or radiance distribution. Hence they are commonly referred to as Uniform Light Sources. One of their main uses is the pixel sensitivity adjustment of digital image sensors and cameras. In photographic technology this is known as white balance. As part of the adjustment, sensitivity differences of individual pixels or pixel groupings are detected and corrected by uniform illumination of all the pixels. To detect possible linearity errors, white balance is performed at different intensities. In addition, uniform light sources are also used to calibrate spectroradiometers in the UV, VIS and IR wavelength range.

The model shown here corresponds to an example configuration. Gigahertz OptiGmbH is an expert in putting together your individual configuration to meet your requirements. So you can contact us with your special requirements!

Integrating sphere

The 30 cm integrating sphere is coated with ODP97 (Bariumsulfate), offers monitor detector and a 63.5 mm entrance optic. Other configurations are possible on request.

Combined UV LED and tungsten light source

In the light sources uses a number of integrated UV LEDs as well as a tungsten light source. The UV LEDs can be operated either individually or combined with one-another. This allows increasing the spectral output in the UV range. This allows a more homogeneous illumination of spectroradiometers that may cover both the UV and the VIS wavelength range.

The dynamic range of LEDs in CW operation is relatively low. The integrating sphere light source therefore offers, in addition to the current setting, a aperture for intensity adjustment with constant LED current. Standard is a manual variable aperture, remote control is available on request.

Short and long term luminance and radiance stability

For the best possible short-term and long-term stability of the luminance, the LEDs are operated in current mode. In addition, the intensity is measured via a monitor detector. The LED control and regulation is done by the optional control electronics. It offers four precision power supplies as well as a touch-screen display and RS232, USB and Ethernet interfaces for manual or remote operation. The tungsten lamp is equipped with a manual variable attenuator for precise intensity control as well as its separate power supply that allows fine-tuning the lamp's color temperature output.

Traceable calibration

The luminance calibration of the uniform light source is carried out in Gigahertz-Optik‘s calibration laboratory for optical radiation measurements. In addition to the calibration of luminance, the spectral radiance and luminance distributions are confirmed in the calibration certificate.