Development of a platform for low intensity light detection used for optical analysis of water purity
As is well-known, Singapore is currently making great efforts for building a robust, diversified and sustainable water supply. Desalination is one of the main methods to obtain drinkable water, but the process lacks on-line procedures/tools to assess water purity easily and rapidly. This project...
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| Other Authors: | |
| Format: | Thesis-Master by Coursework |
| Language: | English |
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Nanyang Technological University
2024
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| Online Access: | https://hdl.handle.net/10356/179579 |
| _version_ | 1826120361211592704 |
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| author | Sun, Binhao |
| author2 | Poenar Daniel Puiu |
| author_facet | Poenar Daniel Puiu Sun, Binhao |
| author_sort | Sun, Binhao |
| collection | NTU |
| description | As is well-known, Singapore is currently making great efforts for building a
robust, diversified and sustainable water supply. Desalination is one of the main
methods to obtain drinkable water, but the process lacks on-line procedures/tools
to assess water purity easily and rapidly.
This project, in collaboration with NEWRI, explores the tremendous potential
to utilize optical analysis (e.g. UV absorbance and/or fluorescence) to monitor
the output of the desalination processes and assess the quality of purified water.
However, the setup and signal processing circuits used for this purpose need
to detect very low light levels. Hence, other methods need to be applied here,
very different from the well-known simple transimpedance amplifier for a photodiode,
which is feasible only for normal applications when the light intensity is
high enough. For instance, lock-in amplifier, or quadrature modulation and detection,
or (sometimes even) time-domain photon counting, are among the main
types of circuits and methods for signal processing used for such applications.
The dissertation will investigate a few of these methods for processing the signal
output from low intensity light detection, assess their advantages and disadvantages,
as well as their performance characteristics. In this paper, we will
investigate several of these methods for processing the output of low-intensity
light detection signals, including which include phase-locked amplification, sampling
integration, correlation detection, adaptive noise cancellation, and amplification
by differential amplification circuits. Their advantages and disadvantages
iii
Abstract
as well as their performance characteristics are evaluated. In this paper, a new
elliptical low-intensity light detection platform is simulated in Zemax by means
of mathematical geometry and design of amplification circuits to detect small
differences between the reference light source and the actual light source. |
| first_indexed | 2024-10-01T05:15:33Z |
| format | Thesis-Master by Coursework |
| id | ntu-10356/179579 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:15:33Z |
| publishDate | 2024 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1795792024-08-16T15:49:08Z Development of a platform for low intensity light detection used for optical analysis of water purity Sun, Binhao Poenar Daniel Puiu School of Electrical and Electronic Engineering EPDPuiu@ntu.edu.sg Engineering Social Sciences As is well-known, Singapore is currently making great efforts for building a robust, diversified and sustainable water supply. Desalination is one of the main methods to obtain drinkable water, but the process lacks on-line procedures/tools to assess water purity easily and rapidly. This project, in collaboration with NEWRI, explores the tremendous potential to utilize optical analysis (e.g. UV absorbance and/or fluorescence) to monitor the output of the desalination processes and assess the quality of purified water. However, the setup and signal processing circuits used for this purpose need to detect very low light levels. Hence, other methods need to be applied here, very different from the well-known simple transimpedance amplifier for a photodiode, which is feasible only for normal applications when the light intensity is high enough. For instance, lock-in amplifier, or quadrature modulation and detection, or (sometimes even) time-domain photon counting, are among the main types of circuits and methods for signal processing used for such applications. The dissertation will investigate a few of these methods for processing the signal output from low intensity light detection, assess their advantages and disadvantages, as well as their performance characteristics. In this paper, we will investigate several of these methods for processing the output of low-intensity light detection signals, including which include phase-locked amplification, sampling integration, correlation detection, adaptive noise cancellation, and amplification by differential amplification circuits. Their advantages and disadvantages iii Abstract as well as their performance characteristics are evaluated. In this paper, a new elliptical low-intensity light detection platform is simulated in Zemax by means of mathematical geometry and design of amplification circuits to detect small differences between the reference light source and the actual light source. Master's degree 2024-08-12T06:30:41Z 2024-08-12T06:30:41Z 2024 Thesis-Master by Coursework Sun, B. (2024). Development of a platform for low intensity light detection used for optical analysis of water purity. Master's thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/179579 https://hdl.handle.net/10356/179579 en application/pdf Nanyang Technological University |
| spellingShingle | Engineering Social Sciences Sun, Binhao Development of a platform for low intensity light detection used for optical analysis of water purity |
| title | Development of a platform for low intensity light detection used for optical analysis of water purity |
| title_full | Development of a platform for low intensity light detection used for optical analysis of water purity |
| title_fullStr | Development of a platform for low intensity light detection used for optical analysis of water purity |
| title_full_unstemmed | Development of a platform for low intensity light detection used for optical analysis of water purity |
| title_short | Development of a platform for low intensity light detection used for optical analysis of water purity |
| title_sort | development of a platform for low intensity light detection used for optical analysis of water purity |
| topic | Engineering Social Sciences |
| url | https://hdl.handle.net/10356/179579 |
| work_keys_str_mv | AT sunbinhao developmentofaplatformforlowintensitylightdetectionusedforopticalanalysisofwaterpurity |