Re-analysis of the in-orbit dark signal behaviour of the ISOPHOT P- and C-detectors

C. Del Burgo, P. Ábrahám, U. Klaas, P. Héraudeau

Research output: Conference contribution

1 Citation (Scopus)

Abstract

We have re-investigated the orbit dependent dark signal behaviour for detectors P1, P2, P3, C100 and C200 from all suitable data sets in the ISO archive. For P1, P3 and C100 we find that the dark signals are almost constant during the orbit. For P2 and C200 we find a steady increase of about 40% and 15%, respectively, between orbital positions 0.2 and 0.85. The high level of the dark signal at the beginning and at the end of the science window period as implied by the previous calibration analysis is not confirmed, although we note a larger scatter in the dark signal values at orbital positions before 0.25 and after 0.80. For P3 and C200 time-dependent calibration files are now required to take into account the impact of re-curing introduced in revolution 150. The C200 array behaves homogeneously. For C100, pixel 2 has a slightly increased dark signal, and pixel 6 presents a high dark signal level. No correlation with space weather activity, as monitored by responsivity checks after curing in the activation window, is seen. The results allow us to perform a more accurate determination of the photometric zero point of the ISOPHOT detectors, which is crucial to absolute photometry observations.

Original languageEnglish
Title of host publicationEuropean Space Agency, (Special Publication) ESA SP
Pages351-355
Number of pages5
Edition481
Publication statusPublished - máj. 2003
EventThe Calibration Legacy of the ISO Mission - madrid, Spain
Duration: febr. 5 2001febr. 9 2001

Other

OtherThe Calibration Legacy of the ISO Mission
CountrySpain
Citymadrid
Period2/5/012/9/01

Fingerprint

Curing
Orbits
Pixels
Calibration
Detectors
Photometry
Chemical activation

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Del Burgo, C., Ábrahám, P., Klaas, U., & Héraudeau, P. (2003). Re-analysis of the in-orbit dark signal behaviour of the ISOPHOT P- and C-detectors. In European Space Agency, (Special Publication) ESA SP (481 ed., pp. 351-355)

Re-analysis of the in-orbit dark signal behaviour of the ISOPHOT P- and C-detectors. / Del Burgo, C.; Ábrahám, P.; Klaas, U.; Héraudeau, P.

European Space Agency, (Special Publication) ESA SP. 481. ed. 2003. p. 351-355.

Research output: Conference contribution

Del Burgo, C, Ábrahám, P, Klaas, U & Héraudeau, P 2003, Re-analysis of the in-orbit dark signal behaviour of the ISOPHOT P- and C-detectors. in European Space Agency, (Special Publication) ESA SP. 481 edn, pp. 351-355, The Calibration Legacy of the ISO Mission, madrid, Spain, 2/5/01.
Del Burgo C, Ábrahám P, Klaas U, Héraudeau P. Re-analysis of the in-orbit dark signal behaviour of the ISOPHOT P- and C-detectors. In European Space Agency, (Special Publication) ESA SP. 481 ed. 2003. p. 351-355
Del Burgo, C. ; Ábrahám, P. ; Klaas, U. ; Héraudeau, P. / Re-analysis of the in-orbit dark signal behaviour of the ISOPHOT P- and C-detectors. European Space Agency, (Special Publication) ESA SP. 481. ed. 2003. pp. 351-355
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AB - We have re-investigated the orbit dependent dark signal behaviour for detectors P1, P2, P3, C100 and C200 from all suitable data sets in the ISO archive. For P1, P3 and C100 we find that the dark signals are almost constant during the orbit. For P2 and C200 we find a steady increase of about 40% and 15%, respectively, between orbital positions 0.2 and 0.85. The high level of the dark signal at the beginning and at the end of the science window period as implied by the previous calibration analysis is not confirmed, although we note a larger scatter in the dark signal values at orbital positions before 0.25 and after 0.80. For P3 and C200 time-dependent calibration files are now required to take into account the impact of re-curing introduced in revolution 150. The C200 array behaves homogeneously. For C100, pixel 2 has a slightly increased dark signal, and pixel 6 presents a high dark signal level. No correlation with space weather activity, as monitored by responsivity checks after curing in the activation window, is seen. The results allow us to perform a more accurate determination of the photometric zero point of the ISOPHOT detectors, which is crucial to absolute photometry observations.

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