Laboratory Tests of a relatively warm 2-D detector array and its application for Airglow Measurements in the ~ 1300 to 1570 nm Region

Details Laboratory Tests of a relatively warm 2-D detector array and its application for Airglow Measurements in the ~ 1300 to 1570 nm Region Laboratory Tests of a relatively warm 2-D detector array and its application for Airglow Measurements in the ~ 1300 to 1570 nm Region

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa52a14r&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA52A-14

Computer Science

Performance

0310 Airglow And Aurora, 3332 Mesospheric Dynamics, 3360 Remote Sensing, 3384 Waves And Tides, 3394 Instruments And Techniques

Scientific paper

Passive radiative cooling is desirable for space borne detectors because it is generally cheaper, less massive and power consumptive than cooling by a mechanical refrigerator or expendable cryogen. Our interest is space borne nadir imaging the OH airglow in Q-branch features of the 9->6 band at ~ 1382.3 nm, and the 2->0 band at ~1434.4 nm with sufficient signal to noise (S/N) to quantitatively retrieve wave structure. Low noise 256 X 256 - 40 micrometer pitch HgCdTe detector arrays are available for our application. E.g., the Rockwell Science Center (RSC) standard 2.5 mm PACE HgCdTe 2-D array bonded on to the PICNIC read out mux satisfies our high sensitivity and low read noise requirements, but would require a mechanical refrigerator or expendable cryogen to cool sufficiently (to about 80K) to satisfy our dark current requirement (< 50e/s/pixel). To demonstrate an option that would provide our required performance at viable passive radiative cooling temperature, we have procured examples of the more recent RSC double layer planar heterogeneous (DLPH) HgCdTe 2-D arrays with shorter wavelength cutoff and produced by molecular beam epitaxy (MBE) on a CdZnTe substrate, and bonded to the PICNIC mux. Here we describe our test procedures and the results which are: 49e/s/pixel dark current at 170K, quantum efficiency lower limit =0.42, and total system noise of 27e/s/read. In addition we will present ground based airglow measurements obtained with this detector, and will describe a space based instrument that uses this detector for nadir imaging of the OH airglow with S/N > 100.

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