96 dB linear high dynamic range CAOS spectrometer demonstration

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Date
2020-11-16
Authors
Mazhar, Mohsin A.
Riza, Nabeel A.
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Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Published Version
10.1109/LPT.2020.3038062
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Abstract
For the first time, a CAOS (i.e., Coded Access Optical Sensor) spectrometer is demonstrated. The design implemented uses a reflective diffraction grating and a time-frequency CAOS mode operations Digital Micromirror Device (DMD) in combination with a large area point photo-detector to enable highly programmable linear High Dynamic Range (HDR) spectrometry. Experiments are conducted with a 2850 K color temperature light bulb source and visible band color bandpass and high-pass filters as well as neutral density (ND) attenuation filters. A ~369 nm to ~715 nm input light source spectrum is measured with a designed ~1 nm spectral resolution. Using the optical filters and different CAOS modes, namely, Code Division Multiple Access (CDMA), Frequency Modulation (FM)-CDMA and FM-Time Division Multiple Access (TDMA) modes, measured are improving spectrometer linear dynamic ranges of 28 dB, 50 dB, and 96.2 dB, respectively. Applications for the linear HDR CAOS spectrometer includes materials inspection in biomedicine, foods, forensics, and pharmaceuticals.
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Keywords
Spectrometer , Digital Micromirror Device , Spectroscopy , Optical MEMS , High Dynamic Range
Citation
Mazhar, M. A. and Riza, N. A. (2020) '96 dB Linear High Dynamic Range CAOS Spectrometer Demonstration', IEEE Photonics Technology Letters, doi: 10.1109/LPT.2020.3038062
Link to publisher’s version
https://ieeexplore.ieee.org/document/9258947
URI
https://hdl.handle.net/10468/10766
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Electrical and Electronic Engineering - Journal Articles
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