Abstract
We present our design for a field-imaging, far-infrared line spectrometer for the SOFIA airborne observatory. The instrument will employ two parallel, medium resolution (R approximately 1700) grating spectrometers for simultaneous observations in the wavelength bands 42-110 μm and 110-210 μm. The Littrov mounted gratings are operated in 1st and 2nd order. Large stressed and unstressed 16×25 pixel Ge:Ga photoconductor arrays are operated in the spectrometer channel, providing good spectral coverage with high responsivity. Image slicers in each spectrometer branch redistribute the 5×5 pixel field of view along the 1×25 pixel entrance slits of the spectrographs, providing both, spatial and spectral multiplexing. Thus, for each of the 25 spatial pixels, we are able to cover a velocity range of approximately 1500 km/s around a selected far infrared line, with an estimated sensitivity of approximately 2×10-15 W Hz-1/2 per pixel.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 86-96 |
| Number of pages | 11 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 3759 |
| State | Published - 1999 |
| Externally published | Yes |
| Event | Proceedings of the 1999 Infrared Spaceborne Remote Sensing VII - Denver, CO, USA Duration: Jul 21 1999 → Jul 23 1999 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering