Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.8609m&link_type=abstract
American Astronomical Society Meeting 210, #86.09; Bulletin of the American Astronomical Society, Vol. 39, p.196
Astronomy and Astrophysics
Astronomy
Scientific paper
We measured the quantum efficiency (QE) of an H2RG HgCdTe near infrared sensor array. We determine a 2-sigma lower limit of 85% for the QE averaged over the array and over three observed wavelengths, 3.38, 3.9, and 4.5 microns. The peak QE occurs near the center of the sensor and is unity within measurement uncertainty (5%). We used a blackbody, narrowband filters, and a pinhole camera to provide a calibrated irradiance on the HgCdTe sensor H2RG-S010. We verified the methods and equipment by substituting a calibrated PbSe diode for the H2RG sensor. Accurate measurement of the QE requires a well-calibrated system gain, the determination of which is complicated by interpixel capacitance, which correlates noise between adjacent pixels. If unaccounted for, the correlation induced by interpixel capacitance would cause the system gain and hence the QE to be overestimated by 20%. We accurately measured the interpixel capacitance using the autocorrelation method of Brown et al. (2006) and by a method described in this report that uses post-readout binning. The two methods yield consistent results, but the binning method is more robust than the autocorrelation method in the presence of electromagnetic interference. The apparent system gain, measured in monochromatic light with the usual variance-versus-mean photon-transfer analysis of flat-field images, is a function of wavelength for wavelengths less than 2 microns, which we interpret as evidence for quantum yield larger than unity, i.e. more than one electron being produced by each photon detected by the sensor. The experiments were performed in the STScI's Operations Detector Laboratory, which is funded in part by the Director's Discretionary Fund and the Mission Offices of HST and JWST at STScI. We appreciate the loan of the H2RG-S010 sensor from Bernard Rauscher, PI for the NIRSpec Detector Subsystem at the Goddard Space Flight Center.
Bergeron Louis
Lindsay Kevin
McCullough Peter R.
Regan Michael
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