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Sequency encoding single pixel spectroscopy based on Hadamard transform
Optics Express
|October 15, 2022
Summary
We developed sequency encoding single pixel spectroscopy (SESPS) using 2D masks for faster spectral measurements. This method significantly speeds up data acquisition compared to traditional techniques, enabling high-speed applications.
Area of Science:
- Spectroscopy
- Optical Engineering
- Signal Processing
Background:
- Single pixel spectroscopy based on Hadamard transform (SPS-HT) offers wavelength multiplexing and improved signal-to-noise ratio.
- Traditional SPS-HT uses 1D masks, coding only one Hadamard coefficient at a time, limiting acquisition speed.
Purpose of the Study:
- To introduce a novel sequency encoding single pixel spectroscopy (SESPS) technique utilizing 2D masks.
- To enable simultaneous coding and reconstruction of all Hadamard coefficients for accelerated spectral measurements.
- To enhance data acquisition speed and reduce noise influence in spectroscopic analysis.
Main Methods:
- Developed SESPS employing 2D masks for concurrent coding of Hadamard coefficients.
- Coded each Hadamard coefficient along the time dimension with unique sequency values.
- Utilized alternating current (AC) measurements for simultaneous reconstruction of all Hadamard coefficients.
Main Results:
- SESPS with 32 spectral channels achieved 14x and 70x acceleration for white light and fluorescence particles, respectively, with <3% RMSE.
- Using 8 spectral channels (4:1 compression) further boosted acceleration by 4x with minimal RMSE increase.
- The new SESPS scheme demonstrated a three-orders-of-magnitude speed increase compared to previous SPS-HT methods.
Conclusions:
- SESPS offers a significant advancement in spectral measurement speed and efficiency.
- The technique is highly suitable for applications demanding rapid spectral analysis, such as spectral flow cytometry and on-site medical diagnostics.
- SESPS shows promise for real-time fluorescence and Raman spectroscopy applications.
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