Implementation of Fast Scan Data Acquisition in Time-Resolved Spectroscopy Experiments

Venkatesh, Pedisetti (2023) Implementation of Fast Scan Data Acquisition in Time-Resolved Spectroscopy Experiments. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS dissertation of Pedisetti Venkatesh (18MS014)) Thesis_18MS014.pdf - Submitted Version Restricted to Repository staff only Download (15MB)

Abstract

This project report focuses on the implementation of a fast scan method for improved data acquisition in terahertz and pump probe time-resolved spectroscopy experiments with jitter correction. Traditional data acquisition methods in terahertz experiments involve significant time consumption, often taking 20–30 minutes for a single scan with steps and waiting periods. In contrast, the fast scan method allows for data acquisition within a single run, reducing the time required to approximately 100–1000 ms. To achieve this, a breakout box has been constructed between the motion controller (ESP3001) and the delay stage (Newport ILS250PP) to extract the encoder signals responsible for triggering the delay stage’s motion. These encoder signals were analyzed to synchronize the timestamps with the computer-collected data, allowing for the jitter correction. Additionally, this report includes two other projects. The second project involves the construction of a temperature-controlled Peltier cooler for studying materials with transition temperatures close to room temperature in terahertz experiments. The advantages of using a Peltier cooler over a cryostat are explored, particularly for materials exhibiting transient temperatures near room temperature. The third project focuses on fluorescence quantum yield measurements for organic samples. These measurements utilize the absorbance and emission data of the samples, aiming to understand their physical properties, especially the fluorescence quantum yield. Overall, this thesis report presents advancements in data acquisition techniques, temperature control methods, and fluorescence quantum yield measurements.

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