Characterization of Bonding Agent Durability in Fatigue Monitoring Applications Utilized in NDT

Here we review the efforts we take in a newly established laboratory inside Institute of Physics in Prague in order to characterize modern large-format CCD and CMOS sensors for sky survey applications. While the laboratory is primarily established in order to participate in low-level CCD sensor characterization for LSST project, we also managed to perform a thorough laboratory testing of recently released Andor Marana sCMOS (which is especially interesting for wide-field sky monitoring applications due to its large format, backilluminated design, high achievable frame rate and low read-out noise), as well as detailed measurements of response non-linearity of Moravian Instruments G4-16000 CCD cameras (based on large-format Kodak KAF-16803 chip) used in several robotic telescopes. We brieﬂy review the results acquired on these cameras, as well as hardware and software we developed for the laboratory.

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Performance Assessment of Low-Cost Thermal Cameras for Medical Applications

Sensors ◽

10.3390/s20051321 ◽

2020 ◽

Vol 20 (5) ◽

pp. 1321 ◽

Cited By ~ 4

Author(s):

Enrique Villa ◽

Natalia Arteaga-Marrero ◽

Juan Ruiz-Alzola

Keyword(s):

Low Cost ◽

Home Monitoring ◽

Medical Applications ◽

Competitive Advantages ◽

Monitoring Applications ◽

Thermal Cameras ◽

Recent Developments ◽

Controlled Environments ◽

Noise Equivalent Temperature Difference

Thermal imaging is a promising technology in the medical field. Recent developments in low-cost infrared (IR) sensors, compatible with smartphones, provide competitive advantages for home-monitoring applications. However, these sensors present reduced capabilities compared to more expensive high-end devices. In this work, the characterization of thermal cameras is described and carried out. This characterization includes non-uniformity (NU) effects and correction as well as the thermal cameras’ dependence on room temperature, noise-equivalent temperature difference (NETD), and response curve stability with temperature. Results show that low-cost thermal cameras offer good performance, especially when used in temperature-controlled environments, providing evidence of the suitability of such sensors for medical applications, particularly in the assessment of diabetic foot ulcers on which we focused this study.

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A Geometrical Study on the Roof Tile-Shaped Modes in AlN-Based Piezoelectric Microcantilevers as Viscosity–Density Sensors

Sensors ◽

10.3390/s19030658 ◽

2019 ◽

Vol 19 (3) ◽

pp. 658 ◽

Cited By ~ 4

Author(s):

Víctor Ruiz-Díez ◽

Javier Toledo ◽

Jorge Hernando-García ◽

Abdallah Ababneh ◽

Helmut Seidel ◽

...

Keyword(s):

Resonant Frequency ◽

Quality Factor ◽

Q Factor ◽

Liquid Media ◽

Roof Tile ◽

Aln Film ◽

Monitoring Applications ◽

Media Monitoring ◽

Comprehensive Study

Cantilever resonators based on the roof tile-shaped modes have recently demonstrated their suitability for liquid media monitoring applications. The early studies have shown that certain combinations of dimensions and order of the mode can maximize the Q-factor, what might suggest a competition between two mechanisms of losses with different geometrical dependence. To provide more insight, a comprehensive study of the Q-factor and the resonant frequency of these modes in microcantilever resonators with lengths and widths between 250 and 3000 µm and thicknesses between 10 and 60 µm is presented. These modes can be efficiently excited by a thin piezoelectric AlN film and a properly designed top electrode layout. The electrical and optical characterization of the resonators are performed in liquid media and then their performance is evaluated in terms of quality factor and resonant frequency. A quality factor as high as 140 was measured in isopropanol for a 1000 × 900 × 10 µm3 cantilever oscillating in the 11th order roof tile-shaped mode at 4 MHz; density and viscosity resolutions of 10−6 g/mL and 10−4 mPa·s, respectively are estimated for a geometrically optimized cantilever resonating below 1 MHz.

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