Application Overview: Sensor Calibration & Imager Testing

This page provides an overview of the products and services which Pro-Lite offers for testing cameras, satellite instrumentation, array detectors (CCD, CMOS and focal plane arrays) and spectroradiometers and photometers.

In addition to test & measurement equipment, we provide Spectralon diffuse reflectance targets.

Labsphere USS-600 

Array Detectors

Uniform light source integrating spheres are routinely used to perform pixel gain normalisation of CCD, CMOS and focal plane array detectors. Labsphere uniform source integrating spheres provide 99% irradiance uniformity for accurate pixel gain normalisation. The calibrated output of the uniform light source can also be used to impart a traceable irradiance or illuminance calibration onto the detector array.
Camera Testing 

Cameras

Image distortions introduced by lens vignetting and cos4 irradiance fall-off are easily corrected by viewing a uniform light source. The process of "flat-fielding" of electronic imaging devices provides in addition for pixel gain normailisation and also imparts a traceable radiance, luminance or spectral radiance calibration onto the camera.
Labsphere Large Uniform Light Source for Satellite Radiometer Calibration 

Satellite Instrumentation

Uniform light source spheres are used to calibrate and characterise large, multi-sensor imaging systems such as those used in earth-observing satellite instruments. Calibration of a remote sensing imaging device employs a uniform light source to determine the sensor’s spectral radiance and radiance responsivity. To do this, the field-of-view of the instrument under test is focused at infinity through the integrating sphere’s exit port which must be large enough to overfill the instrument’s FOV.
Labsphere USS-800 Uniform Light Source 

Spectroradiometers & Photometers

The absolute response of an illuminance or luminance photometer or spectroradiometer can be performed using an integrating sphere uniform light source. The sphere output is calibrated for illuminance (lux) or luminance (cd/m2) for transfer to the device under test; the sphere output is calibrated for spectral radiance (W/m2.sr.nm) for transfer to a spectroradiometer.