An Investigation Into an Appropriate optical Calibration Source for a Corona Camera

Coetzer, Casper; West, Nicholas J.; Swart, A.; Tonder, Andrew van

doi:10.1109/saupec/robmech/prasa48453.2020.9041014

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…There are various types of sources that are proposed for the calibration of SBUV cameras such as Blackbody radiators, deuterium lamps, laser, electrical discharge, and specially adapted LED sources [20,21] SBUV cameras have different output responses to each of these sources, which are attributed to the difference between the spectrum of the source and the cameras themselves. The methods and proposals to solve the spectral mismatching will be discussed in the future as an additional step to improve accuracy.…”

Section: Calibration Sourcementioning

confidence: 99%

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Opto-Electronics Review

Coetzer,

West

2021

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Solar-blind ultraviolet cameras with image intensifier with CMOS detector typically use various count methodologies to measure the optical energy of an electrical corona. However, these count methodologies are non-radiometric without considering parameters such as distance, focus-, zoom-, and gain setting of a camera. An algorithm which considers the calibration and radiometric measurement of optical energy for the slow frame rate intensifier type cameras is presented. Furthermore, it is shown how these calibration data together with the flowcharts are used for the conversion from raw measured data to radiometric energy values.

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Section: Calibration Sourcementioning

confidence: 99%

“…Relations (1) to (5) need to be manipulated in such a manner that the measured digital level can be converted to an optical energy flux format relation [4,20]. However, part of the solution (source vs. camera output) is in the enclosed form of an integral that needs to be solved.…”

Section: Calibration Curvesmentioning

confidence: 99%

Opto-Electronics Review

Coetzer,

West

2021

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“…However, despite its obvious importance, this parameter is not presented in data sheets of typical SBUV cameras [1][2][3][4][5][6]. More importantly, the available scientific papers devoted to the characteristics of SBUV cameras did not present any concept on how to measure this parameter [7][8][9][10][11]. In such a situation this paper presents the concept (definition, measurement method, test equipment, interpretation of results) of measuring solar sensitivity of SBUV cameras.…”

Section: Introductionmentioning

confidence: 99%

Opto-Electronics Review

Chrzanowski,

Safiej

2020

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Solar blind UV cameras are not theoretically supposed to be sensitive to solar light. However, there is practically always some sensitivity to solar light. This limited solar sensitivity can sometimes make it impossible to detect the weak emission of a corona target located on the solar background. Therefore, solar sensitivity is one of the crucial performance parameters of solar blind UV cameras. However, despite its importance, the problem of determining solar sensitivity of solar blind UV cameras has not been analysed and solved in the specialized literature, so far. This paper presents the concept (definition, measurement method, test equipment, interpretation of results) of measuring solar sensitivity of solar blind UV cameras.

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