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Temperature Measurement Method for Blast Furnace Molten Iron Based on Infrared Thermography and Temperature Reduction Model
摘要： The temperature measurement of blast furnace (BF) molten iron is a mandatory requirement in the ironmaking process, and the molten iron temperature is signi?cant in estimating the molten iron quality and control blast furnace condition. However, it is not easy to realize real-time measurement of molten iron temperature because of the harsh environment in the blast furnace casthouse and the high-temperature characteristics of molten iron. To achieve continuous detection of the molten iron temperature of the blast furnace, this paper proposes a temperature measurement method based on infrared thermography and a temperature reduction model. Firstly, an infrared thermal imager is applied to capture the infrared thermal image of the molten iron ?ow after the skimmer. Then, based on the temperature distribution of the molten iron ?ow region, a temperature mapping model is established to measure the molten iron temperature after the skimmer. Finally, a temperature reduction model is developed to describe the relationship between the molten iron temperature at the taphole and skimmer, and the molten iron temperature at the taphole is calculated according to the temperature reduction model and the molten iron temperature after the skimmer. Industrial experiment results illustrate that the proposed method can achieve simultaneous measurement of molten iron temperature at the skimmer and taphole and provide reliable temperature data for regulating the blast furnace.
关键词： skimmer,taphole,blast furnace,temperature reduction model,molten iron temperature,infrared thermography
更新于2025-09-09 09:28:46
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Utility of lacrimal caruncle infrared thermography when monitoring alterations in autonomic activity in healthy humans
摘要： Purpose Physiological markers that estimate sympathetic activation may be used to infer pain and stress in humans. To date, effective reproducible methods are invasive and pose an undesired risk to participants. Previous work in animal models has used infrared thermography to measure the temperature of the lacrimal caruncle region and may be a promising method for measuring stress and pain non-invasively. The current study aimed to determine whether this method is useful in humans. Methods Sixteen young healthy participants (age: 18–35) were recruited and underwent sympathetic activation using a cold pressor test (CPT) and a muscle chemoreflex (MCR), and completed a control trial. Throughout all trials, infrared thermographic imaging of the lacrimal caruncle, heart rate, heart rate variability, mean arterial blood pressure and pulse transit time were measured. Results Heart rate (MCR: 4 ± 3?bpm, CPT: 17 ± 4?bpm p < 0.01) and mean arterial pressure increased (MCR: 6 ± 2, CPT: 5 ± 2?mmHg, p < 0.01) and pulse transit time decreased (p = 0.03) with both sympathetic activation interventions. However, lacrimal caruncle temperature did not vary under any condition remaining at 35.2 ± 0.2?°C which was similar to baseline. Conclusions Our findings suggest infrared thermographic monitoring of eye temperature in humans does not reliably relate to sympathetic activation. This could be due to hemodynamic responses at the lacrimal caruncle that may be more complex than previously proposed with sympathetic activation. Alternatively, pulse transit time seems like a promising non-invasive measure of changes in sympathetic activation in humans.
关键词： Sympathetic nervous system activation,Muscle chemoreflex,Thermography,Muscle metaboreflex,Infrared imaging
更新于2025-09-09 09:28:46
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Quantitative lock-in thermography imaging of thermal-wave spatial profiles and thermophysical property measurements in solids with inner corner geometries using thermal-wave field theory
摘要： In this study, we established a theoretical photothermal model and its experimental validation for an infinitely long solid with an inner corner of arbitrary opening angle, with the solid being irradiated photothermally by a modulated laser beam of arbitrary spatial intensity distribution directed to the corner. The thermal-wave field distribution on the flat surfaces of the solid centered at the corner was obtained using the Green function method. Experimental results based on quantitative thermographic imaging were obtained and used to validate the theoretical model in which thermal diffusivity of an inner cornered stainless steel was measured. The thermal-wave theory based lock-in thermography imaging technique provides a quantitative tool for thermal property measurement and/or non-destructive evaluation of non-flat structures. It also generates valuable physical insights into the spatial distribution of the thermal-wave field in the neighborhood of geometric discontinuities such as inner corners in solids.
关键词： lock-in thermography,thermal-wave field,photothermal model,thermal diffusivity,non-destructive evaluation
更新于2025-09-09 09:28:46
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[IEEE 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Paris, France (2018.10.14-2018.10.17)] 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Failure detection of solar panels using thermographic images captured by drone
摘要： In this work, we compare several methods for detecting failed solar panels, and found that drone detection is the most efficient. We show thermographic images captured by drone and explain various types of panel failures. An examination by deep learning revealed that single shot detection (SSD) is an effective method of automatic detection. We ran tests with the SSD model using 4-MW solar plant data and achieved a mean average precision of 49.11%.
关键词： Thermography,Mega solar,Drone,Failure detection,Solar power
更新于2025-09-09 09:28:46
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Recent industrial applications of infrared thermography: a review
摘要： Infrared thermography is a non-invasive technique that is drawing an increasing attention in industry. The spectacular advance in the features of the infrared cameras that has come together with their progressive cost reduction have expanded the use of this technique to many industrial applications that were unfeasible just a few years ago. This paper compiles and comments the most recent scientific contributions related to the application of this technique in the industrial context. The paper classifies the analyzed references into three main groups: electrical, mechanical and other applications. Especial emphasis is made on induction motor-related applications of the infrared thermography due to the extensive participation of these machines in the industrial context. The paper provides a critical review of most of the analyzed references, emphasizes the way in which the infrared technique is applied to the specific application and presents the limitations and pending issues as well as the future challenges regarding the application of the technique.
关键词： industry,fault diagnosis,thermography,infrared,mechanical faults,induction motors,transformers
更新于2025-09-09 09:28:46
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Thermal management and characterization of high-power wide-bandgap semiconductor electronic and photonic devices in automotive applications
摘要： GaN-based high-power wide-bandgap semiconductor electronics and photonics have been considered as promising candidates to replace conventional devices for automotive applications due to high energy conversion efficiency, ruggedness, and superior transient performance. However, performance and reliability are detrimentally impacted by significant heat generation in the device active area. Therefore, thermal management plays a critical role in the development of GaN-based high-power electronic and photonic devices. This paper presents a comprehensive review of the thermal management strategies for GaN-based lateral power/RF transistors and light-emitting diodes (LEDs) reported by researchers in both industry and academia. The review is divided into three parts: (1) a survey of thermal metrology techniques, including infrared thermography, Raman thermometry, and thermoreflectance thermal imaging, that have been applied to study GaN electronics and photonics, (2) practical thermal management solutions for GaN power electronics, and (3) packaging techniques and cooling systems for GaN LEDs used in automotive lighting applications.
关键词： semiconductor,Raman thermometry,infrared thermography,high-power,automotive applications,LEDs,thermoreflectance thermal imaging,GaN,thermal management,wide-bandgap
更新于2025-09-04 15:30:14
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Effect of Bad Connection on Surface Temperature of Lithium-Ion Batteries by Using Infrared Thermography
摘要： The temperature distribution of lithium-ion batteries in the electric vehicle is very important for the electric vehicle performance. Heat is produced during lithium-ion batteries operation while being charged and discharged. The battery can in worst case go into thermal runaway if the heat cannot be dissipated rapidly. This experimental investigation analysis the thermal behaviour of a 13Ah pouch type lithium-ion battery through characterisation and determination of the evolution of surface temperature distribution and profiles when there is a bad connection in the positive tab. Infrared thermography and contact thermocouples were employed for a commercial cell thermal analysis. Different types of load profiles were applied to the battery cell. The loads consisted of constant current charge and discharge cycles with currents magnitude of 13A, 26A, 39A and 52A.It was concluded that bad connection increased the non-uniformity of surface temperature and risk of thermal runaway in lithium-ion batteries.
关键词： bad connection,infrared thermography,thermal runaway,surface temperature,lithium-ion batteries
更新于2025-09-04 15:30:14
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[Springer Proceedings in Energy] Cold Climate HVAC 2018 (Sustainable Buildings in Cold Climates) || Assessment of Thermal Bridging Heat Loss by Means of the Infrared Thermography Technique
摘要： Thermal bridges influence the thermal standard of a building envelope. They are taken into account in the linear thermal transmittance or W-value, and can be estimated from tabulated values for standard building details or from numerical modelling. However, these methods are not applicable for existing buildings with unknown structure. In these cases, in situ measurement of the W-value is necessary. In this study, a methodology to measure the actual thermal bridging performance is developed. The methodology is based on a infrared thermography technique, which can be used on any existing thermal bridge. To ensure high accuracy, temperature-dependent surface heat transfer coefficients are calculated using the surface temperatures recorded by the infrared camera. The methodology has been validated under steady state conditions in a hot box apparatus with very good agreement.
关键词： Quantitative thermography technique,Hot box,Thermal bridging,Building envelope
更新于2025-09-04 15:30:14
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[IEEE 2018 XIV International Scientific-Technical Conference on Actual Problems of Electronics Instrument Engineering (APEIE) - Novosibirsk, Russia (2018.10.2-2018.10.6)] 2018 XIV International Scientific-Technical Conference on Actual Problems of Electronics Instrument Engineering (APEIE) - Up-to-Date Thermal Imaging Systems in the Multichannel Automated Measurements
摘要： A highly informative methodology, the essence of which is to obtain the parameters of an object under study by means of the data synchronous acquisition from several measurement channels, predominantly based on different physical principles, infrared thermography (IRT) as a leading research tool included in such a multichannel (multimodal) measuring system is considered in some detail. The IRT-aided multichannel approach is demonstrated with studying the physiological characteristics in humans. The measurement synchronism of different technical means is realized by the computerization and automation of the experiment. The programmable microcontroller ESP32 served as main operating and readout unit. With a time resolution of 100-200 measurements per second, the experimental data were obtained. It made it possible to reveal the human physiological characteristics as follows: the extremities temperature change, pulse waves and their velocity in the radial artery, breathing dynamics, blood pressure evaluated in two different regimes of brachial cuff air filling – inflation and deflation. The brachial cuff inflation also served as external interventional impact on the organism. It is found that, after the brachial artery cross-clamping, the pulse wave velocity in the radial artery is capable of doubling in comparison with that measured before compression. It is shown that the multimodal technology is a promising means in modern experimental science.
关键词： SEIRT,blood pressure measurement,breathing dynamics,experiment automation,multichannel (multimodal) measurements,pulse wave velocity,Infrared thermography,thermal imaging,programmable microcontroller,pulse wave,computer-aided measurements
更新于2025-09-04 15:30:14
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An overview of corrosion defect characterization using active infrared thermography
摘要： Corrosion is considered a destructive phenomenon that affects almost all metals. There is a variety of corrosion monitoring and measurement techniques being deployed across industries. However, very few techniques are ideally characterised with non-contact, non-intrusive, on-line and direct features for measuring the accurate corrosion rate or actual metal loss. Infrared Thermography (IRT) allows the recording of electromagnetic waves emitted from objects by using an infrared imaging system, such as an infrared camera. IRT is an online method of Non-Destructive Testing (NDT) meaning the delays in receiving results from a laboratory experienced in many NDT techniques can be eliminated. It is non-intrusive which means no process disruption and downtime will be imposed to the production line. It is also a non-contact method which mitigates the hazard occurrence and need for highly experienced personnel.
关键词： Infrared thermography,Non-destructive testing,Corrosion monitoring,Structural health monitoring,Image processing
更新于2025-09-04 15:30:14