Evaluation of a Hadamard-Coded Photodiode-Array Spectrometer Under Low Illumination
PHILLIPS LAB HANSCOM AFB MA
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Hadamard spectrometers are well known for their multiplexing andor throughput advantages. Traditionally these instruments require moving entrance andor exit masks. The performance of a breadboard photodiode-array Hadamard transform spectrometer with a stationary entrance mask is evaluated against the same instrument configured with a single entrance slit. The higher throughput of the multislit, no-moving parts instrument has provided a higher signal-to-noise ratio over the single-slit spectrometer in low-illumination conditions. Sources of noise are examined for the single-slit and multislit Hadamard instruments, and improvements for future designs are suggested.
- Electrical and Electronic Equipment
- Optical Detection and Detectors
- Atomic and Molecular Physics and Spectroscopy