Accession Number:

ADA279413

Title:

Evaluation of a Hadamard-Coded Photodiode-Array Spectrometer Under Low Illumination

Descriptive Note:

Journal article

Corporate Author:

PHILLIPS LAB HANSCOM AFB MA

Personal Author(s):

• Robichaud, Joseph L.
• Wong, Wallace K.
• Van Tassel, Roger A.

Report Date:

1994-01-01

Pagination or Media Count:

9.0

Abstract:

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.

Descriptors:

• *OPTICAL DETECTORS
• *PHOTODIODES
• *SPECTROMETERS
• REPRINTS
• OPTICS
• DETECTORS
• SPECTROSCOPY
• XENON LAMPS
• SIGNAL TO NOISE RATIO
• MULTIPLEXING
• ARRAYS
• ILLUMINATION
• SIGNALS
• THROUGHPUT

Subject Categories:

• Electrical and Electronic Equipment
• Optical Detection and Detectors
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE