Shortwave infrared 512 x 2 line sensor for earth resources applications
Abstract
As part of the NASA remote-sensing Multispectral Linear Array Program, an edge-buttable 512 x 2 IRCCD line image sensor with 30-micron Pd2Si Schottky-barrier detectors is developed for operation with passive cooling at 120 K in the 1.1-2.5 micron short infrared band. On-chip CCD multiplexers provide one video output for each 512 detector band. The monolithic silicon line imager performance at a 4-ms optical integration time includes a signal-to-noise ratio of 241 for irradiance of 7.2 microwatts/sq cm at 1.65 microns wavelength, a 5000 dynamic range, a modulation transfer function, greater than 60 percent at the Nyquist frequency, and an 18-milliwatt imager chip total power dissipation. Blemish-free images with three percent nonuniformity under illumination and nonlinearity of 1.25 percent are obtained. A five SWIR imager hybrid focal plane was constructed, demonstrating the feasibility of arrays with only a two-detector loss at each joint.
- Publication:
-
IEEE Transactions on Electron Devices
- Pub Date:
- August 1985
- DOI:
- 10.1109/T-ED.1985.22166
- Bibcode:
- 1985ITED...32.1574T
- Keywords:
-
- Infrared Imagery;
- Infrared Instruments;
- Remote Sensors;
- Satellite Imagery;
- Satellite Instruments;
- Short Wave Radiation;
- Edges;
- Electronic Packaging;
- Focal Plane Devices;
- Image Resolution;
- Irradiance;
- Multiplexing;
- Signal To Noise Ratios;
- Transfer Functions;
- Spacecraft Instrumentation