The non-linearity of the ESA Photon Counting Detector

Astronomy and Astrophysics – Astrophysics

Scientific paper

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European Space Agency, Imaging Techniques, Quantum Counters, Radiation Counters, Radiation Detectors, Image Intensifiers, Nonlinearity, Phosphorescence

Scientific paper

The time-resolved imaging mode (TRIM) suggested by di Serego Alighieri and Perryman (1986), in which photons are recorded separately on each television camera frame, was used to analyze the data obtained in 1984 on the nucleus of M31 with the ESA Photon Counting Detector (PCD) on the Canada-France-Hawaii telescope. Through the examination of the TRIM data, it was possible to detect nonlinearity in the response of the ESA PCD, which is interpreted as being due to phosphorescence in the intensifier. A quantitative measurement of this effect is shown. It is argued that if the interpretation is correct, the same kind of nonlinearity should be found in all photon counting detectors with phosphor screen. The amount of the nonlinearity is presumably higher in detectors with lower thresholds.

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