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Variable resolution capability for multichannel filter spectrometers.

P S Henry1

  • 1Crawford Hill Laboratory, Bell Laboratories, Holmdel, New Jersey 07733, USA.

The Review of Scientific Instruments
|February 1, 1979
PubMed
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A novel spectrum expander instrument enhances spectrometer resolution for real-time, high-fidelity measurements. This digital signal-processing device is crucial for applications like radio astronomy, improving data acquisition capabilities.

Area of Science:

  • Electronics
  • Signal Processing
  • Radio Astronomy

Background:

  • Traditional spectrometers have fixed resolutions, limiting real-time measurement capabilities.
  • Radio astronomy often relies on multichannel filter spectrometers with inherent resolution constraints.

Purpose of the Study:

  • To introduce a new electronic instrument, the spectrum expander, for improving spectrometer resolution.
  • To enable real-time, high-resolution spectral measurements.

Main Methods:

  • Described the principles of a two-port digital signal-processing spectrum expander.
  • Formulated design rules and analyzed noise and quantization effects.
  • Presented performance data from a prototype expander.

Main Results:

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  • The spectrum expander creates a frequency-expanded replica of the input spectrum (Sout(Ef) ≈ Sin(f)).
  • A prototype expander processed signals up to 12.5 MHz, expanding them for a 128-channel, 32-MHz spectrometer.
  • Signal degradation was minimal, with an output signal-to-noise ratio only ~0.1 dB lower than the input.

Conclusions:

  • The spectrum expander effectively enhances spectrometer resolution, enabling advanced real-time measurements.
  • The instrument offers a practical solution for fields like radio astronomy requiring higher spectral fidelity.