Computational laser intensity stabilisation for organic molecule concentration estimation in low-resource settings

Shahid A. Haider; Farnoud Kazemzadeh; Alexander Wong

doi:10.1117/12.2253380

21 March 2017 Computational laser intensity stabilisation for organic molecule concentration estimation in low-resource settings

Shahid A. Haider, Farnoud Kazemzadeh, Alexander Wong

Author Affiliations +

Proceedings Volume 10055, Optics and Biophotonics in Low-Resource Settings III; 100550W (2017) https://doi.org/10.1117/12.2253380
Event: SPIE BiOS, 2017, San Francisco, California, United States

Abstract

An ideal laser is a useful tool for the analysis of biological systems. In particular, the polarization property of lasers can allow for the concentration of important organic molecules in the human body, such as proteins, amino acids, lipids, and carbohydrates, to be estimated. However, lasers do not always work as intended and there can be effects such as mode hopping and thermal drift that can cause time-varying intensity fluctuations. The causes of these effects can be from the surrounding environment, where either an unstable current source is used or the temperature of the surrounding environment is not temporally stable. This intensity fluctuation can cause bias and error in typical organic molecule concentration estimation techniques. In a low-resource setting where cost must be limited and where environmental factors, like unregulated power supplies and temperature, cannot be controlled, the hardware required to correct for these intensity fluctuations can be prohibitive. We propose a method for computational laser intensity stabilisation that uses Bayesian state estimation to correct for the time-varying intensity fluctuations from electrical and thermal instabilities without the use of additional hardware. This method will allow for consistent intensities across all polarization measurements for accurate estimates of organic molecule concentrations.

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Shahid A. Haider, Farnoud Kazemzadeh, and Alexander Wong "Computational laser intensity stabilisation for organic molecule concentration estimation in low-resource settings", Proc. SPIE 10055, Optics and Biophotonics in Low-Resource Settings III, 100550W (21 March 2017); https://doi.org/10.1117/12.2253380

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KEYWORDS

Polarization

Laser stabilization

Gas lasers

Helium neon lasers

Biological research

Doppler effect

Linear polarizers

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