Analysing Thermal Images Taken by the Fluke TiS20 Thermal Imager

2021 ◽  
Vol 14 (3) ◽  
pp. 613
Author(s):  
F. Protoklitow ◽  
K. Roslon ◽  
M.J. Peryt
Keyword(s):  
Thermal Imager ◽  
Thermal Images

Implementation of InfraRed Thermographic surveys in complex coastal areas: the case study of Polignano a Mare (southern Italy)

2021 ◽  
Author(s):  
Lidia Loiotine ◽  
Marco La Salandra ◽  
Gioacchino Francesco Andriani ◽  
Eliana Apicella ◽  
Michel Jaboyedoff ◽  
...  
Keyword(s):  
Rock Mass ◽  
Structure From Motion ◽  
Southern Italy ◽  
Thermal Imager ◽  
Rock Masses ◽  
Field Surveys ◽  
Thermal Images ◽  
Thermal Anomalies ◽  
Rock Face

<p><em>InfraRed Thermography</em> (IRT) spread quickly during the second half of the 20<sup>th</sup> century in the military, industrial and medical fields. This technique is at present widely used in the building sector to detect structural defects and energy losses. Being a non-destructive diagnostic technique, IRT was also introduced in the Earth Sciences, especially in the volcanology and environmental fields, yet its application for geostructural surveys is of recent development. Indeed, the acquisition of thermal images on rock masses could be an efficient tool for identifying fractures and voids, thus detecting signs of potential failures.<br>Further tests of thermal cameras on rock masses could help to evaluate the applicability, advantages and limits of the IRT technology for characterizing rock masses in different geological settings.<br>We present some results of IRT surveys carried out in the coastal area of Polignano a Mare (southern Italy), and their correlation with other remote sensing techniques (i.e. <em>Terrestrial Laser Scanning</em> and <em>Structure from Motion</em>). The case study (<em>Lama Monachile</em>) is represented by a 20 m-high cliff made up of Plio-Pleistocene calcarenites overlying Cretaceous limestones. Conjugate fracture systems, karst features, folds and faults, were detected in the rock mass during field surveys. In addition, dense vegetation and anthropogenic elements, which at places modified the natural setting of the rock mass, represent relevant disturbances for the characterization of the rock mass. In this context, IRT surveys were added to the other techniques, aimed at detecting the major discontinuities and fractured zones, based on potential thermal anomalies. <br>IRT surveys were carried out in December 2020 on the east side of the rock mass at <em>Lama Monachile</em> site. Thermal images were acquired every 20 minutes for 24 hours by means of a FLIR T-660 thermal imager mounted on a fixed tripod. Ambient air temperature and relative humidity were measured during the acquisition with a pocketsize thermo-hydrometer. A reflective paper was placed at the base of the cliff to measure the reflected apparent temperature. In addition, three thermocouple sensors were fixed to the different lithologic units of the rock face. These parameters, together with the distance between the FLIR T-660 and the rock face, were used in order to calibrate the thermal imager and correct the apparent temperatures recorded by the device, during the post-processing phase. Successively, vertical profiles showing the temperature of the rock face over time were extracted from the thermograms. Thermal anomalies were correlated with stratigraphic and Geological Strength Index profiles, obtained by means of field surveys and Structure from Motion techniques. The presence of fracture and voids in the rock mass was also investigated.</p>

Thermal Error Modeling of Rotary Axis Based on Convolutional Neural Network

2021 ◽  
pp. 1-13
Author(s):  
Chengyang Wu ◽  
Sitong Xiang ◽  
Wansheng Xiang
Keyword(s):  
Neural Network ◽  
Convolutional Neural Network ◽  
Thermal Error ◽  
Error Modeling ◽  
Data Sets ◽  
Thermal Imager ◽  
Thermal Images ◽  
Rotary Axis ◽  
Different Temperatures ◽  
Five Axis

Abstract Rotary axes are the key components for five-axis CNC machines, while their motions are dramatically influenced by thermal issues. To precisely model the thermal error of rotary axis, a convolutional neural network (CNN) model is developed. To form data sets for the CNN, a laser interferometer is used to measure the angular positioning error at different temperatures and a thermal imager is taken to obtain thermal images of the rotary axis. The measured thermal error is fitted to a sine curve so that training parameters are reduced. And the thermal pixel values of the initial thermal image are subtracted from all the thermal images to consider the incremental thermal effect, so the influence of the initial temperature is negligible. Finally, a deep CNN model with multiple output classifications is designed to complete the data training, verifying and testing. The experimental results show that the prediction accuracy for the parameters is higher than 90%, and the percentage reduction in error is higher than 80%.

scholarly journals Application of Thermal Images for Determining the Vegetation Coverage Ratio at Free-Frame Shotcrete Grid Beam Protected Slope

2018 ◽  
Vol 206 ◽  
pp. 04003
Author(s):  
Chien-Yuan Chen ◽  
Zheng-Sheng Jiang
Keyword(s):  
Surface Radiation ◽  
Evaluation Methodology ◽  
Vegetation Coverage ◽  
Engineering Practice ◽  
Thermal Imager ◽  
Long Distance ◽  
Thermal Images ◽  
Coverage Ratio ◽  
Surface Radiation Temperature ◽  
Regional Temperature

In this study, infrared thermography was used to determine the vegetation coverage ratio (VCR) at a free-frame shotcrete grid beam-protected slope. An infrared thermal imager can detect the changes in surface radiation temperature on naked and vegetation-covered slope areas. Regional temperature analysis was performed through thermography, and the average temperature derived from the captured thermal images was used as the index for the vegetation area; the VCR was also evaluated. This method can be used in engineering practice after construction to reduce the errors in subjective visual judgment and can also serve as an effective and scientific evaluation methodology. A long-distance noncontact detection method for VCR evaluation can increase the engineering applicability of the proposed method after construction.

scholarly journals Coaxiality Evaluation of Coaxial Imaging System with Concentric Silicon–Glass Hybrid Lens for Thermal and Color Imaging

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5753
Author(s):  
Tomoyuki Takahata
Keyword(s):  
Imaging System ◽  
Color Images ◽  
Point Of View ◽  
Service Robots ◽  
Thermal Imager ◽  
Thermal Images ◽  
Personal Mobility ◽  
Long Wavelength ◽  
Intrinsic And Extrinsic Parameters ◽  
Long Wavelength Infrared

Thermal imaging is useful for tasks such as detecting the presence of humans and recognizing surrounding objects in the operation of several types of robots, including service robots and personal mobility robots, which assist humans. Because the number of pixels on a thermal imager is generally smaller than that on a color imager, thermal images are more useful when combined with color images, assuming that the correspondence between points in the images captured by the two sensors is known. In the literature, several types of coaxial imaging systems have been reported that can capture thermal and color images, simultaneously, from the same point of view with the same optical axis. Among them, a coaxial imaging system using a concentric silicon–glass hybrid lens was devised. Long-wavelength infrared and visible light was focused using the hybrid lens. The focused light was subsequently split using a silicon plate. Separate thermal and color images were then captured using thermal and color imagers, respectively. However, a coaxiality evaluation of the hybrid lens has not been shown. This report proposes an implementation and coaxiality evaluation for a compact coaxial imaging system incorporating the hybrid lens. The coaxiality of the system was experimentally demonstrated by estimating the intrinsic and extrinsic parameters of the thermal and color imagers and performing 2D mapping between the thermal images and color images.

Automatic Bruise Detection in Fruits Using Thermal Images

2017 ◽  
Vol 7 (5) ◽  
pp. 727-732 ◽  
Author(s):  
Manisha Satone ◽  
◽  
Samruddhi Diwakar ◽  
Vaishnavi Joshi ◽  
◽  
...  
Keyword(s):  
Thermal Images

Thyroid Cancer Detection Using Thermal Images

2020 ◽  
Vol 24 (5) ◽  
pp. 1667-1675
Author(s):  
Vidhya J.V.
Keyword(s):  
Thyroid Cancer ◽  
Cancer Detection ◽  
Thermal Images

LEGAL REGULATION OF THE USE OF UNMANNED AERIAL VEHICLES IN THE PENAL SYSTEM

2020 ◽  
pp. 29-36
Author(s):  
Анна Николаевна Королева
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Personal Data ◽  
Legal Regulation ◽  
Unmanned Aircraft ◽  
Penal System ◽  
Thermal Imager ◽  
Historical Aspect ◽  
Aerial Vehicles ◽  
Arbitration Process ◽  
Duration Of Storage

Беспилотные воздушные суда и беспилотные авиационные системы становятся частью повседневной жизни, в том числе в деятельности органов и учреждений уголовно-исполнительной системы. В статье исследован исторический аспект появления беспилотных воздушных судов в России и зарубежных странах, необходимость, типовые задачи и особенности правового регулирования использования беспилотных воздушных судов в уголовно-исполнительной системе. Однако ряд вопросов до настоящего времени является предметом дискуссии и требуют правового регулирования. Современные технологии позволяют оснастить беспилотные воздушные суда различными приборами, придающими им дополнительные функциональные характеристики: приборами видео- и фотофиксации, тепловизором, громкоговорителем, оружием. В зарубежных странах сложилась разная практика регулирования: от разрешения использования беспилотных воздушных судов с оружием в правоохранительной деятельности и уголовно-исполнительной системе (США, Великобритания и др.) до протестов гражданского общества и требований законодательного запрещения использования беспилотных воздушных судов, способных причинить вред человеку. Не решены вопросы в части регулирования порядка сбора, обработки, передачи и хранения (в том числе длительности хранения) информации, полученной в ходе видео- и фотофиксации, включая передачу информации, содержащей персональные данные гражданина, в частности, его изображение. Обсуждается вопрос о соблюдении прав человека и гражданина, в том числе осужденного, при получении и использовании информации, полученной при помощи беспилотных воздушных судов в деятельности органов и учреждений уголовно-исполнительной системы. Требуется внесение изменений в процессуальное законодательство в части регулирования использования данных, полученных при помощи беспилотных воздушных судов, как доказательств, а также в целом их юридическое значение в административном, уголовном, гражданском (арбитражном) процессе. Необходимо урегулирование вопросов ответственности сотрудников уголовно-исполнительной системы, которые могут превысить полномочия с помощью использования беспилотных воздушных судов. В рамках Национальной технологической инициативы происходит активное развитие рынка АэроНет, поэтому беспилотные воздушные суда в деятельности уголовно-исполнительной системы могут стать частью этого рынка. Unmanned aerial vehicles and unmanned aircraft systems are becoming part of everyday life, including in the activities of bodies and institutions of the penal system. The article examines the historical aspect of the appearance of unmanned aerial vehicles in Russia and foreign countries, the need, typical tasks and features of the legal regulation of the use of unmanned aerial vehicles in the penal system. However, a number of issues are still the subject of discussion and require legal regulation. Modern technologies make it possible to equip unmanned aerial vehicles with various functional characteristics, ranging from video and photo capture, the availability of a thermal imager, a loudspeaker, to weapons. In different countries, different regulatory practices have developed: from allowing unmanned aerial vehicles with weapons in law enforcement and the penal system (USA, UK, etc.) to civil society protests and the requirements of the legislative prohibition on the use of unmanned aircraft that can cause harm to humans. Unresolved issues regarding the regulation of the procedure for collecting, processing, transferring and storing (including the duration of storage) of information obtained during video and photo recording, including the transmission of information containing personal data of a citizen, including its image. The issue of observing the human rights of a citizen, including a convict, is discussed when receiving and using information received by unmanned aerial vehicles in the activities of bodies and institutions of the penal system. Amendments to the procedural legislation are required in terms of regulating the use of data obtained by unmanned aerial vehicles as evidence, as well as in general their legal significance in the administrative, criminal, civil (arbitration) process. It is necessary to resolve the issues of responsibility of employees of the penitentiary system, which may exceed their authority through the use of unmanned aerial vehicles. As part of the National Technological Initiative, the AeroNet market is actively developing, therefore unmanned aerial vehicles in the activities of the penitentiary system can become part of this market.

Work Plan for the Marine Aerosol Properties and Thermal Imager Performance Trial (MAPTIP)

1993 ◽  
Author(s):  
D. R. Jensen ◽  
G. de Leeuw ◽  
A. M. van Ejik
Keyword(s):  
Thermal Imager ◽  
Marine Aerosol ◽  
Work Plan ◽  
Performance Trial ◽  
Aerosol Properties

ALGORITHMS OF TWO-STAGE RECOVERY OF RADIO THERMAL IMAGES

2017 ◽  
Vol 59 (1) ◽  
pp. 3-9
Author(s):  
V. K. Klochko ◽  
◽  
S. M. Gudkov ◽  
Keyword(s):  
Two Stage ◽  
Thermal Images

scholarly journals Experimental Study on Infrared Temperature Characteristics and Failure Modes of Marble with Prefabricated Holes under Uniaxial Compression

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 713
Author(s):  
Yanyan Peng ◽  
Qunchao Lin ◽  
Manchao He ◽  
Chun Zhu ◽  
Haijiang Zhang ◽  
...  
Keyword(s):  
Uniaxial Compression ◽  
Failure Modes ◽  
Rock Sample ◽  
Vertical Axis ◽  
Maximum Temperature ◽  
Thermal Imager ◽  
Infrared Thermal Imaging ◽  
Average Temperature ◽  
Observation Area ◽  
Evolution Behavior

In rock engineering, it is of great significance to study the failure mechanical behavior of rocks with holes. Using a combination of experiment and infrared detection, the strength, deformation, and infrared temperature evolution behavior of marble with elliptical holes under uniaxial compression were studied. The test results showed that as the vertical axis b of the ellipse increased, the peak intensity first decreased and then increased, and the minimum value appeared when the horizontal axis was equal to the vertical axis. The detection results of the infrared thermal imager showed that the maximum temperature, minimum temperature, and average temperature of the observation area in the loading stage showed a downward trend, and the range of change was between 0.02 °C and 1 °C. It was mainly due to the accumulation of energy in the loading process of the rock sample that caused the surface temperature of the specimen to decrease. In the brittle failure stage, macroscopic cracks appeared on the surface of the rock sample, which caused the energy accumulated inside to dissipate, thereby increasing the maximum temperature and average temperature of the rock sample. The average temperature increase was about 0.05 °C to about 0.19 °C. The evolution of infrared temperature was consistent with the mechanical characteristics of rock sample failure, indicating that infrared thermal imaging technology can provide effective monitoring for the study of rock mechanics. The research in this paper provides new ideas for further research on the basic characteristics of rock failure under uniaxial compression.

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