Ultraviolet and visible imaging and spectrographic imaging instrument.

Area of Science:

• Space Science and Astronomy
• Optical Instrumentation
• Remote Sensing

Background:

• The Midcourse Space Experiment (MSX) mission required advanced sensor technology for comprehensive environmental monitoring.
• Previous imaging and spectrographic instruments had limitations in spectral range, resolution, and dynamic range.

Purpose of the Study:

• To introduce the Ultraviolet and Visible Imaging and Spectrographic Imaging (UVISI) instrument for the MSX mission.
• To detail the design, capabilities, and operational modes of the UVISI instrument.
• To outline the instrument's planned investigations of celestial, atmospheric, and point sources.

Main Methods:

• The UVISI instrument comprises five spectrographic imagers and four imagers, operating from 110 to 900 nm.
• Spectrographic imagers feature selectable slits, programmable spectral and spatial dimensions, and a scan mirror for 1° × 1° image generation.
• Imagers offer narrow and wide fields of view with filter wheels for spectral selection; all sensors utilize intensified CCD detectors with high dynamic range and automatic gain control.

Main Results:

• The instrument provides flexible spectrographic and imaging capabilities across a wide ultraviolet and visible spectrum.
• High spectral resolution (0.5–4 nm) and programmable spatial/spectral dimensions allow detailed analysis.
• Intensified CCD detectors with extended dynamic range enable observation of diverse light intensities.

Conclusions:

• The UVISI instrument is a versatile, high-performance sensor suite designed for the MSX mission.
• Its advanced capabilities will enable significant investigations into various astronomical and atmospheric phenomena.
• The instrument's planned 4-year mission life will yield valuable scientific data.