Mr. Nicolò Scarabottolo Profile

Nicolò Scarabottolo

at CNR-IFN

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Proceedings Article | 22 April 2020 Presentation + Paper

In-line inspecting device for leak detection from gas-filled food packages

Nicolò Scarabottolo, Massimo Fedel, Lorenzo Cocola, Luca Poletto

Proceedings Volume 11421, 1142103 (2020) https://doi.org/10.1117/12.2557784

KEYWORDS: Packaging, Calibration, Inspection, Sensors, Helium, Electronic circuits, Infrared spectroscopy, Photodiodes, Nitrogen, Carbon dioxide

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A device based on non-dispersive infrared spectroscopy has been developed for leak testing through non-invasive evaluation of escaping carbon dioxide (CO₂) outside of Modified-Atmosphere-Packed (MAP) cheese containers. The targeted samples are bags of processed mozzarella sealed in modified atmosphere at the end of the manufacturing process, in which the internal CO₂ concentration is higher than 10% vol. for product shelf-life extension. The device performs in-line measurement on moving samples on a conveyor belt with the application of a calibrated test pressure to the samples to stimulate leaks through any possible package defect such as holes, cuts, wrinkles and swelling in the seal. The sensor device takes advantage of a multichannel suction manifold and an array of high-speed, optical non- dispersive CO₂ sensors for a space-resolved sensing of any leaked carbon dioxide around the sample perimeter. Any variation in the detected carbon dioxide level when compared with ambient background is correlated with a faulty package. Moreover, the device is able to report and log an approximate fault location and automatically remove the defective package from the production line.

Proceedings Article | 9 April 2020 Presentation + Paper

Diode-based Raman sensor for fuel gas analysis

L. Cocola, F. Melison, N. Scarabottolo, G. Tondello, L. Poletto

Proceedings Volume 11354, 113541A (2020) https://doi.org/10.1117/12.2554538

KEYWORDS: Raman spectroscopy, Spectroscopy, Semiconductor lasers, Methane, Biogases, Diodes, Sensors, Calibration, Nitrogen, Gases

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A multi gas analyzer for in line composition evaluation has been developed and optimized for the detection of fuel gas main components. The system has been designed for unmanned and remote operation on natural gas pipelines and biogas production plants as a low cost and low maintenance alternative to current industry standard gas chromatographic methods which are used to evaluate the mixture heating value as well as to detect undesired contaminants. The system does not require any consumable supply and could also be considered as a competitor of most available non-analytical techniques for the determination of heating value, which in our case can be obtained from actual gas composition through application of the relevant calculation as described by ISO 6976 norm. A high-power, lighting grade multimode laser diode pump has been used to reduce both manufacturing and operation costs as well as power supply requirements. Sample gas is flowing in a cell rated for high pressure operation and the spectral analysis is performed by a custom design, high throughput lens based spectrometer developed for this application featuring an industrial CMOS camera as a low cost, high sensitivity and low noise focal plane array. The use of a multimode pump operating over a wide temperature range and a non-cooled detector array are the source of several issues in the recorded spectra which have been addressed with the developement of custom image processing and fitting software routines to cope with broadened, drifting Raman spectra. This approach has been lab calibrated against the single components (such as methane, ethane, propane, n-butane, iso-butane, nitrogen, oxygen, water vapour, carbon dioxide, carbon monoxide, hydrogen) and tested with certified gas mixtures made to simulate the concentration levels commonly found during field operation at total absolute pressures ranging from 1 to 6 bar.

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