A real-time and portable digital lock-in amplifier for quartz-enhanced photo-acoustic spectroscopy (QEPAS)

Tatenguem, Herve; Josnan, Amrita D.; Hoppe, Morten; Milde, Tobias; Sacher, Joachim

doi:10.1117/12.2545940

Cited by 3 publications

(2 citation statements)

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“…The backbone of this subsystem is built around an FPGA board. It consists of an embedded home-made lock-in amplifier [11] with an embedded function generator. The embedded function generator provides reference frequency to the mixer of the lock-in amplifier.…”

Section: -3 Third Subsystem (C): Processing Via Fpgamentioning

confidence: 99%

QEPAS Spectroscopy with fully tunable IC-ECDL with high bandwidth for the MIR range

Tatenguem¹,

Hoppe²,

Aßmann³

et al. 2023

Photonic Instrumentation Engineering X

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To meet the requirements for multi-species gas analysis, Quartz-Enhanced Photo-Acoustic Spectroscopy (QEPAS) is used in combination with an IC-based External Cavity Laser system (IC-ECL). The laser system allows the coverage of a wavelength range of 285 nm with an output power of several mW. By integrating piezoelectric actuators as well as resonantly driven MEMS actuators, extremely high sampling rates can be achieved. In this work, results on the detection of multiple trace gases by sequential quasi-simultaneous measurements are presented. The requirements of multi-species detection, output power, tuning range and detection rate are met by our work.

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Section: -3 Third Subsystem (C): Processing Via Fpgamentioning

confidence: 99%

QEPAS Spectroscopy with fully tunable IC-ECDL with high bandwidth for the MIR range

Tatenguem¹,

Hoppe²,

Aßmann³

et al. 2023

Photonic Instrumentation Engineering X

Self Cite

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“…This work explores a solution to improve the LOD of FS through the integration of a lock-in amplifier (LIA). Due to its sensitive detection capabilities, LIAs have been widely used in various applications [26]- [30], and miniaturized into portable systems [31]- [33]. Additionally, LIA systems are used in ultrafast optics [34]- [37] and terahertz spectroscopy [38]- [41] photonic systems.…”

Section: Introductionmentioning

confidence: 99%

Lock-in Amplifier Dairy Sensor for Detection of Ciprofloxacin

et al. 2023

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This work introduces a sensor for dairy antibiotic detection of ciprofloxacin in milk. We provide an important tool for antibiotic detection in milk and the main contributions of this work are as follows. We introduce a technique based on florescence spectroscopy and lock-in amplification for sensing ciprofloxacin in milk that is capable of detection below the regulatory limit. We compare the system against one without the integrated lock-in amplification, as in traditional fluorescence sensors. We provide microchip capillary electrophoresis results and place our work in context for future integration with microchip capillary electrophoresis.

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