Imager-spectrograph

My approach to this issue has been to use the molecular bands of CH, CN and now NH to study the star-to-star abundance variations of C and of N. Since these bands are strong enough to be observed at moderate resolution, I can use the multiplexing capability of the Low Resolution Imaging Spectrograph at Keck (Oke et al 1995) to build up large samples. This effort is being undertaken jointly with Michael Briley of the University of Wisconsin at Oshkosh and with Peter Stetson of the National Research Council, Victoria, Canada. 

Payne, W. F., Llewellyn, E. J., and Matsushita, J. S. (1995) OSIRIS An Imaging Spectrograph for Odin, paper presented at the 46th International Astronautical Congress, Norway, October 1995. 

Figure 7.3 Layout of an SI unit based on an ImSpector (Speclm, SF) imaging spectrograph A near-IR camera with two-dimensional-InGaAs chip (e), B ImSpector with line aperture (b), transfer optics (c) and PGP spectral analyser component (d) C view optics D sample plane with observation line (a). Reproduced with permission from Speclm after an optical rendering.

The radiation enters the imaging spectrograph (B) through a line slit aperture (b) and is projected by optics (c) onto the dispersive PGP element (d). The spectrally... 

The Cassini spacecraft took this image of Saturn s rings using the Ultraviolet Imaging Spectrograph. It shows there is more ice (turquoise) than rocks and dust (orange) in the outer parts of the rings. 

Simpson JW, Ruiz-Martinez MC, Mulhern GT, Berka J, Latimer DR, Ball JA, et al. A transmission imaging spectrograph and microfabricated channel system for DNA analysis. Electrophoresis 2000 21 135-149. 

Cartledge S. I. B., Meyer D. M., and Lauroesch J. T. (2001) Space telescope imaging spectrograph observations on interstellar oxygen and krypton in translucent clouds. Astrophys. J. 562, 394-399. 

An imaging spectrograph differs from a conventional (e.g., Czerny-Turner) design in that it maintains the one-to-one correspondence of the entrance slit and its image at the detector. So a circular fiber positioned at the entrance... 

Figure 8.5. Images of the entrance slit for monochromatic light of 400, 500, and 600 ran at the focal plane of a conventional (nonimaging) spectrograph and an ideal imaging spectrograph. Distortion of slit image in conventional system varies significantly for different configurations.

Figure 1112. Schematic of line imaging onto a CCD. A line focus at the sample projected onto the slit of an imaging spectrograph generates a two-dimensional image of intensity vs. x and An.

Figure 11.15. Apparatus for generating a line focus with mechanically scanned mirrors. Scanner 1 and scanner 2 are computer-controlled oscillating mirrors. The grating and mirrors of the imaging spectrograph are located between the entrance slit and CCD but are not shown. (Adapted from...

Figure 11.27. Schematic of a Hadamard transform imaging Raman spectrometer. The mask is moved between CCD exposures by the stepping motor, and the cylindrical lens creates a line focus along the entrance slit to an imaging spectrograph. (Adapted from Reference 24.)...

---