Calibration of circular aperture area using vision probe at inmetro

Calibration of circular aperture area using vision probe at inmetro

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Circular aperture areas are standards of high importance for the realization 2 lb m&m bag of photometric and radiometric measurements, where the accuracy of these measures is related to the accuracy of the circular aperture area calibrations.In order to attend the requirement for traceability was developed in Brazilian metrology institute, a methodology for circular aperture area measurement as requirements from the radiometric and photometric measurements.In the developed methodology apertures are measured by non-contact measurement through images of the aperture edges captured by a camera.

These images are processed using computer vision techniques and then echofix spring reverb the values of the circular aperture area are determined.