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Updated: Jul 18, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Published on: February 4, 2017

In-Loco Optical Spectroscopy through a Multiple Digital Lock-In on a Linear Charge-Coupled Device (CCD) Array.

Hugo Fonsêca^1,2, Diego Rativa^1,2, Ricardo Lima²

¹Department of Computer Engineering, University of Pernambuco, Recife 50720-001, Brazil.

Sensors (Basel, Switzerland)

|August 26, 2023

Summary

This summary is machine-generated.

This study introduces digital lock-in processing for CCD spectrometers, enabling accurate optical measurements despite variable lighting. The technique effectively mitigates external interference for reliable spectroscopy in uncontrolled environments.

Keywords:

CCD spectrometer digital lock-in amplifier signal processing

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Area of Science:

Optics and Photonics
Spectroscopy
Digital Signal Processing

Background:

Accurate optical property measurements are vital for industry but challenged by fluctuating external light.
Uncontrolled illumination conditions hinder the reliability of standard spectroscopy techniques.

Purpose of the Study:

To develop a novel digital lock-in processing technique for CCD spectrometers.
To enable reliable optical spectroscopy in uncontrolled and fluctuating lighting conditions.

Main Methods:

Digital lock-in processing applied simultaneously to each pixel of a Charge-Coupled Device (CCD) spectrometer.
Mitigation of external optical interferences through simultaneous pixel-level processing.

Main Results:

Successful recovery of a yellow LED spectrum under outdoor lighting conditions with significant external interference (-70.45 dB Signal-to-Noise Ratio).
Demonstrated applicability for spectroscopic analysis of gold nanoparticles in outdoor settings.

Conclusions:

The proposed digital lock-in processing technique enhances the robustness of CCD spectrometers.
This method is effective for optical measurements in challenging, uncontrolled lighting environments, broadening spectroscopy applications.