A New Method of Dark-Current Estimation for Diffuse Sky Measurements with the AKARI Infrared Camera

Details A New Method of Dark-Current Estimation for Diffuse Sky Measurements with the AKARI Infrared Camera A New Method of Dark-Current Estimation for Diffuse Sky Measurements with the AKARI Infrared Camera

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011pasj...63..755t&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.63, No.4, pp.755--762

Astronomy and Astrophysics

Astronomy

1

Infrared: General, Instrumentation: Detectors, Methods: Data Analysis, Space Vehicles, Techniques: Image Processing

Scientific paper

We developed a new method for estimating the dark current of near-infrared (NIR) data from the Infra-Red Camera (IRC) aboard the AKARI satellite. The existing method of dark-current estimation is insufficient because the dark current is enhanced by charged particles hitting the detector in the South Atlantic Anomaly (SAA). We could trace this dark-current drift even during astronomical observations by monitoring the dark current in the masked region on the focal plane of IRC. We analyzed approximately 4500 dark frames, and found a relation in the integrated dark charge between the masked region and the exposed one of the detector array. Using this relation, we can estimate the integrated dark charge at each pixel from the average integrated dark charge in the masked region even during astronomical observations. Residuals in our new method were shown to be approximately 1 ADU (corresponding to 3 nW m-2sr-1 for the N2 band), even for the SAA-enhanced case, which is better than those in any existing methods by five or more times.

Affiliated with

Also associated with

No associations

Rating

A New Method of Dark-Current Estimation for Diffuse Sky Measurements with the AKARI Infrared Camera does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A New Method of Dark-Current Estimation for Diffuse Sky Measurements with the AKARI Infrared Camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A New Method of Dark-Current Estimation for Diffuse Sky Measurements with the AKARI Infrared Camera will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1665817