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Researchers developed a compact laser spectrometer using a commercial System-on-Chip (SoC) for high-precision gas sensing. This portable system enables advanced multi-species gas detection in various applications.

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Area of Science:

  • Spectroscopy
  • Optical Engineering
  • Electronics Engineering

Background:

  • High-precision mobile gas sensing is crucial for diverse applications.
  • Quantum cascade laser absorption spectroscopy offers field-deployment advantages but faces challenges in portable instrumentation.
  • Existing systems often lack compact, cost-effective solutions for laser driving and data acquisition.

Purpose of the Study:

  • To address the challenges in implementing quantum cascade laser absorption spectroscopy into portable gas sensing instruments.
  • To develop a cost-effective, compact, and research-grade laser spectrometer.
  • To demonstrate the adaptation of a commercial System-on-Chip (SoC) for advanced spectroscopic measurements.

Main Methods:

  • Utilized a time-division multiplexed intermittent continuous wave driving concept for laser operation.
  • Employed a commercial System-on-Chip (SoC) with Field Programmable Gate Array (FPGA) for laser driving and real-time data acquisition.
  • Developed a re-designed universal current driver compatible with various quantum cascade laser types and configurations.
  • Implemented on-board averaging of spectral scans using FPGA functionalities for optimized performance and autonomous operation.

Main Results:

  • A re-designed current driver was created, offering a universal solution for multi-wavelength quantum cascade lasers.
  • The commercial SoC successfully managed synchronized trigger signals and digital I/O for flexible laser control.
  • Spectroscopic signals were sampled at 125 MS/s with 14-bit resolution, and on-board averaging improved efficiency.
  • The system demonstrated research-grade performance in analyzing carbon dioxide (CO2) absorption features at 4.3 μm.

Conclusions:

  • A cost-effective, compact, and commercial SoC can be adapted into a fully operational research-grade laser spectrometer.
  • The developed system enhances the feasibility of portable, high-precision multi-species gas sensing.
  • This approach paves the way for advanced, field-deployable spectroscopic instrumentation.