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A High Sensitivity Preamplifier for Quartz Tuning Forks in QEPAS (Quartz Enhanced PhotoAcoustic Spectroscopy)

Tomasz Starecki¹, Piotr Z Wieczorek²

¹Institute of Electronic Systems, Warsaw University of Technology, Nowowiejska 15/19, 00-665 Warsaw, Poland. tomasz@starecki.com.

Sensors (Basel, Switzerland)

|November 4, 2017

Summary

This study introduces a novel voltage amplifier configuration for Quartz Enhanced Photoacoustic Spectroscopy (QEPAS) sensors. This new design significantly boosts QEPAS sensitivity compared to traditional transimpedance amplifiers.

Keywords:

QEPAS sensor preamplifier design quartz enhanced photoacoustic spectroscopy quartz tuning fork transimpedance amplifier

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Area of Science:

Spectroscopy
Sensor Technology
Electronics

Background:

Current Quartz Enhanced Photoacoustic Spectroscopy (QEPAS) preamplifiers use transimpedance configurations.
Quartz tuning forks, central to QEPAS, possess properties favoring voltage over transimpedance amplification.

Purpose of the Study:

To design and evaluate a novel voltage amplifier configuration for QEPAS sensors.
To demonstrate the superiority of voltage amplification for QEPAS applications.

Main Methods:

Development of an electrical model for the proposed voltage amplifier circuit.
Experimental testing and comparison with existing transimpedance configurations.

Main Results:

Theoretical analysis and experimental data confirm a substantial increase in output signal with the voltage configuration.
The voltage amplifier configuration shows potential for increasing QEPAS sensitivity by one to two orders of magnitude.

Conclusions:

A voltage amplifier configuration is a more optimal solution for QEPAS sensors than traditional transimpedance designs.
This advancement promises to significantly enhance the sensitivity of QEPAS measurements.