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Increasingly important - Imaging photometers and colorimeters

The use of imaging photometers and colorimeters for fast capture of photometric and colorimetric quantities with spatial resolution has attracted increasing interest. Compared with measuring instruments without spatial resolutions, such as spectrometers, this technology offers the following advantages:

  • Substantial time-savings with simultaneous capture of a large number of measurements in a single image
  • Image-processing functions integrated in the software permit automated methods of analysis, e.g. calculation of homogeneity or contrast

However, the absolute measuring precision of imaging photometers and colorimeters is not as high as spectroradiometers. This is because of the operational principle using a CCD Sensor in combination with optical filters, which can only be adapted to the sensitivity of the human eye with limited precision.

Imaging photometers and colorimeters are the instruments of choice for:

  • Measurement of luminance and color distribution of panel graphics and control elements in the automotive industry and avionics
  • Measurement of homogeneity, contrast, mura and MTF of flat-panel displays
  • Analysis of luminous intensity distribution of lamps

Instrument Systems developed the LumiCam model series optimized for these applications, incl. powerful Software. A range of resolutions and image sizes are covered by interchangeable objective lenses.

Model

Effective number of pixels 

CCD Sensor 

Maximum Pixel resolution 1)

Maximum image size at 1m distance

LumiCam 1300

1280 x 1000

2/3 inch

6,5 µm

29 x 23 cm 2)

1) with 105 mm macro lens     2) with 28 mm objective lens

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   The CCD technology of LumiCam

Both LumiCam models are based on advanced Interline CCDs with electronic shutters. The advantages against Full-Frame-Transfer (FFT) CCDs with mechanical shutters are greater robustness and minimal blooming. These characteristics permit a multi-exposure operating mode in which several images are taken at different exposure times and then merged to create a single image. This permits precise measurement of even very large differences in luminance within a scene.