Reflective Multi-Wavelength Filtering Of Atmospheric Emission Lines With Minimal Moving Parts.

Overview

Low-light narrow-band optical observations are one of the primary means for studying the aurora and upper ionosphere. A common auroral research instrument is the atmospheric imager, which has progressed technologically over time. Current imagers in use consist of a charge-coupled device (CCD) camera mated to telecentric (collimating) optics, filter wheel, and fish-eye objective lens. Efficient use of incident light is critical to providing adequate sensitivity, while minimization of moving parts leads to improved...
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Overview

Low-light narrow-band optical observations are one of the primary means for studying the aurora and upper ionosphere. A common auroral research instrument is the atmospheric imager, which has progressed technologically over time. Current imagers in use consist of a charge-coupled device (CCD) camera mated to telecentric (collimating) optics, filter wheel, and fish-eye objective lens. Efficient use of incident light is critical to providing adequate sensitivity, while minimization of moving parts leads to improved reliability. Eliminating moving parts and using both transmitted and reflected light will enhance system performance, lower cost, and enhance reliability. In this research, a new multi-spectral imager design consisting of unique spatial arrangement of mirrors and two interference filters has been developed. This new arrangement utilizes a series of multiple reflections involving the oblique arrangement of interference filters and mirrors to channel three images of the light source onto a single CCD, while utilizing a common input optic and telecentric stage. The key feature is that out-of-band light reflected from the filters, which is wasted in conventional designs, is redirected into additional filters and utilized to provide information at other wavelengths, providing several times the effective throughput for a single input optical element.
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Product Details

  • ISBN-13: 9781243391995
  • Publisher: BiblioLabsII
  • Publication date: 9/1/2011
  • Pages: 86
  • Product dimensions: 7.44 (w) x 9.69 (h) x 0.18 (d)

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