A Hadamard-multiplexed spectrometer based on an acousto-optic tunable filter
- 1 April 1996
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Instrumentation and Measurement
- Vol. 45 (2), 394-398
- https://doi.org/10.1109/19.492754
Abstract
This paper presents a Hadamard-multiplexed spectrometer based on an acousto-optic tunable filter (AOTF). The multifrequency capability of the AOTF enables it to be operated in a multiplexed mode. The AOTF can then be operated at lower power to obtain improved passband characteristics without a reduction in the signal-to-noise ratio as compared to a higher-power, nonmultiplexing instrument. An expandable, PC-based spectrometer has been developed to illustrate this technique. The current implementation provides seven-frequency Hadamard multiplexing and collects the spectra in multiplexed blocks. The AOTF is controlled via IEEE-485 bussed VHF synthesizer modules based on a hybrid DDS/PLL technique. The modular design allows convenient system expansion. The design of and specifications for this instrument are discussed.Keywords
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