Experimental Validation of High Spatial Resolution of Two-Color Optical Fiber Pyrometer

Safarloo, Sahar; Tapetado, A.; Vázquez, Carmen

doi:10.3390/s23094320

Cited by 3 publications

(4 citation statements)

References 34 publications

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“…Next, the system was installed in the technological line of the corrugator and configured. Continuous measurement of the surface temperature of paper or cardboard requires the use of non-contact measurement techniques [ 31 , 32 , 33 ]. The system consists of pyrometers and immersion thermometers, a corrugator speed transducer, and recorders of measured values connected to a local computer network.…”

Section: Methodsmentioning

confidence: 99%

Measurement and Control of Corrugated Board Production Parameters Taking into Account Individual Operator Preferences

Pełczyński,

Kadys,

Szewczyk

2023

Sensors

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The article presents a proposal for optimizing the production process of corrugated cardboard based on measurements of process variables as well as the knowledge and skills of the operator conducting production. This technique involves continuous recording and analysis of process quantities that affect the quality of the produced cardboard. For this purpose, a network of temperature sensors with a system of continuous registration and monitoring of the process variables was designed and installed in the industrial environment of the corrugator. The recorded data is analyzed to estimate the desired values of the measured process variables, giving clues to how to control the production line. Unlike existing systems, the proposed algorithm for controlling production parameters allows each operator to use their preferred values for process variables independently of others. The proposed system allows for improving the quality of the produced cardboard and increasing the efficiency of its production by taking into account the individual experience and habits of the operator conducting production.

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Section: Methodsmentioning

confidence: 99%

Measurement and Control of Corrugated Board Production Parameters Taking into Account Individual Operator Preferences

Pełczyński,

Kadys,

Szewczyk

2023

Sensors

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“…Finally, to verify the model experimental measurements will be carried out in future works using small targets as those reported in [23]. Substituting ( 17) in ( 16), and solving for θ max , it is found that:…”

Section: Critical Distance As a Function Of Tilting Anglementioning

confidence: 97%

“…Finally, to verify the model experimental measurements will be carried out in future works using small targets as those reported in [23].…”

Section: Critical Distance As a Function Of Tilting Anglementioning

confidence: 99%

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Influence of Tilting Angle on Temperature Measurements of Different Object Sizes Using Fiber-Optic Pyrometers

Vargas,

Tapetado,

Vázquez

2023

Sensors

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This article presents a new model of optical power gathered by a fiber-optic pyrometer when there is a tilting angle between the fiber longitudinal axis and the vector perpendicular to the tangent plane of the emitted surface. This optical power depends on the fiber specifications, such as the diameter and the numerical aperture (NA), as well as the object parameters, including its diameter, emissivity, and tilting angle. Some simulations are carried out using other pyrometers from the literature without tilting to validate the model. Additional simulations with different optical fibers, object sizes, and distances at different tilting angles allow us to describe the behavior of the pyrometer when the object is smaller than the optical fiber field of view (the light cone defined by its NA). The results show that for a finite surface object, the power collected by the optical fiber is affected by changes in the tilting angle, greater tilting lesser gathered power, and reaching the maximum power when the field of view of the fiber covers up the entire object, as expected. On the other hand, additional equations are presented to describe the maximum tilting angle, and distance that allow the maximum power gathered for a determined object diameter and fiber, avoiding temperature measurement errors.

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Mechanical Energy Dissipation During Seismic Dynamic Weakening in Calcite‐Bearing Faults

Aretusini,

Nuñez Cascajero,

Cornelio

et al. 2024

JGR Solid Earth

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Earthquakes are frictional instabilities caused by the shear stress decrease, that is, dynamic weakening, of faults with slip and slip rate. During dynamic weakening, shear stress depends on slip, slip rate, and temperature, according to constitutive laws governing the earthquake rupture process. In the laboratory, technical limitations in measuring temperature during frictional instabilities inhibit the investigation and interpretation of shear stress evolution. Here we conduct high velocity friction experiments on calcite‐bearing simulated faults, both on bare‐rock and on gouge samples, at 20–30 MPa normal stress, 1–6 m/s slip rate and 1–20 m total slip. Seismic slip pulses are reproduced by imposing boxcar and regularized Yoffe slip rate functions. We measured, together with shear stress, slip, and slip rate, the temperature evolution on the fault by employing an innovative two‐color fiber optic pyrometer. The comparison between modeled and measured temperature reveals that for calcite‐bearing faults the heat sink caused by decarbonation reaction controls the temperature evolution. In bare‐rocks, energy is dissipated as frictional heat, and temperature increase is buffered by the heat sink of the calcite decarbonation reaction. In gouges, energy is dissipated as frictional heat and for plastic deformation processes, balanced by the heat sink caused by the decarbonation reaction enhanced by the mechanochemical effect. Our results suggest that in calcite‐bearing rocks, a common fault zone material for earthquake sources in the continental crust at shallow depth, the type of fault materials (bare‐rocks vs. gouges) controls the energy dissipation during seismic slip.

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Experimental Validation of High Spatial Resolution of Two-Color Optical Fiber Pyrometer

Cited by 3 publications

References 34 publications

Measurement and Control of Corrugated Board Production Parameters Taking into Account Individual Operator Preferences

Measurement and Control of Corrugated Board Production Parameters Taking into Account Individual Operator Preferences

Influence of Tilting Angle on Temperature Measurements of Different Object Sizes Using Fiber-Optic Pyrometers

Mechanical Energy Dissipation During Seismic Dynamic Weakening in Calcite‐Bearing Faults

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