Our Research activities
Compact acoustic detection modules
Realization of compact acoustic detection module including a custom-made quartz tuning fork and micro-resonator system, optical access via two windows and gas in and out connections.
Custom-made tuning forks and micro-resonators
Custom-made quartz tuning fork properly designed and realized to offer high performance for QEPAS sensors, in terms of quality factor and electrical charges collection efficiency.
Fiber-coupled mid-IR QEPAS Sensors
Fiber-optic components are key enabling technologies to improve the robustness and effectiveness of QEPAS sensors in terms of flexible beam guidance and compactness.
Cavity-Enhanced QEPAS Sensors
Ultra-sensitive and selective QEPAS sensors combined with high-finesse optical cavities can increase the detection sensitivity up to two orders of magnitude.
THz QEPAS SENSORS
High sensitivity THz molecular spectroscopy is crucial for the study of chemical processes related to ozone depletion and global warming, as well as direct identification of explosives and drugs.
Trace gas sensors are the heart of any monitoring system in industrial and urban areas. Real-time and in-situ QEPAS-based monitoring systems are crucial to ensure an environmentally sustainable territorial development.
Exhaled breath biomarkers have particular clinical appeal offering non-invasive medical diagnostics. Dedicated QEPAS sensors can be used as repeatable, continuous and real-time breath analysis tool.
Gas Leak detection is a critical problem for several applications requiring hermetically closed areas. QEPAS-based leak sensors are several orders of magnitude more sensitive than a bubble test or helium sniffer.
Portable Quartz enhanced photoacoustic sensors (QEPAS) system are capable to detect in situ methane, ethane, propane and butane in gas phase, with detection limits in the few part-per-million concentration range.
Monitoring of hotspot areas
Certain chemicals can be used in the illicit manufacture of explosives or to cause harm. Quartz enhanced photoacoustic sensors (QEPAS) system are capable to detect toxic gases and explosive precursors down to few part-per-million concentration range.
Vincenzo Luigi Spagnolo
Vittorio M. N. Passaro
Stefano Dello Russo
The PolySense team has just published a new article on Photoacoustics Journal reporting on a comparison between piezoelectric and interferometric readouts of vibrations in quartz tuning forks (QTFs) for quartz-enhanced photoacoustic (QEPAS) trace gas detection. The following link provide access to the article. http://polysense.poliba.it/wp-content/uploads/2020/01/113_Piezo-interferometric-QEPAS_Photoaocustics_2020.pdf
The PolySense team has just published a new article on Photoacoustics Journal reporting on multi-gas QEPAS detection of methane and nitrous oxide using a quantum cascade laser array. A methane detection sensitivity of 200 ppb and 60 ppb for nitrous oxide were achieved with a 10 s lock-in integration time. The following link provide access Leggi di piùNew Publication on Photoacoustics Journal[…]
The PolySense team has just published a new article on Applied Physics Letters reporting on a highly sensitive trace gas sensor based on light-induced thermoelastic spectroscopy (LITES) and a custom quartz tuning fork (QTF). A minimum detection limit of 325 ppb was achieved at an integration time of 1 s, nearly one order of magnitude Leggi di piùNew Publication on Applied Physics Letters[…]
The PolySense team has just published a new article on Optics Express reporting on the realization of a novel grooved quartz tuning fork detector for Quartz-enhanced photoacoustic sensing. Rectangular grooves were carved on each prong surface of the QTF to reduce the electrical resistance and enhance the piezoelectric effect without affecting the resonance frequency and Leggi di piùNew Publication on Optics Express[…]
Publication of a Chapter on QEPAS on the Elsevier book: Mid-infrared Optoelectronics Materials, Devices, and Applications
Vincenzo Spagnolo and Pietro Patimisco from the PolySense team have contributed with a full chapter on QEPAS technology in an Elsevier -Woodhead Publishing Series in Electronic and Optical Materials book entitled: Mid-infrared Optoelectronics Materials, Devices, and Applications, 1st edition. The following link provide access to the article: http://polysense.poliba.it/wp-content/uploads/2019/11/Elsevier-mid-infrared-optoelectronics_qepas-chapter.pdf
Prof. Spagnolo will give a seminar on Nov 7th at the Technical University of Munich on “Quartz-enhanced photoacoustic spectroscopy: basics, merits and real-world applications”.
11/10/2019. Houston. The PolySense team presented at ASTRO project meeting in Rice University the first QEPAS prototype for sensing-on-drone. The technology will open the way to air pollution monitoring exploiting the potentiality of drone systems.
The PolySense team has just published a new article on Analytical Chemistry reporting on a the realization of a QEPAS sensor for simultaneous dual gas detection of Methane/Nitric Oxide and water vapor with sensitivity down to few ppbs, by simultaneously exciting two in-plane flexural vibrational mode of a custom QTF. The following link provide access Leggi di piùNew publication on Analytical Chemistry Journal[…]
The PolySense team has just published a new article on Sensors and Actuators B Chemical reporting on a the realization of a QEPAS sensor for CH4 detection with vibrational to translational (V-T) relaxation self-calibration via simultaneous detection of water vapor concentration, exploiting a custom QTF operating in both the fundamental and first overtone flexural mode. Leggi di piùNew publication on Sensors and Actuators B Chemical[…]
Prof. Vincenzo Spagnolo, Prof. Lei Dong, Prof. Weidong Chen and Dr. Pietro Patimisco are currently accepting submissions for the upcoming Special Issue titled “Optical Spectroscopy, Sensing, and Imaging from UV to THz Range”, which will be published in Sensors MPDI . The Special Issue belongs to the section “Physical Sensors” and is open to both original Leggi di piùSpecial Issue “Optical Spectroscopy, Sensing, and Imaging from UV to THz Range”[…]