scholarly journals Infrared thermal imaging monitoring on hands when performing repetitive tasks: An experimental study

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0250733
Author(s):  
Alejandra García Becerra ◽  
Jesús Everardo Olguín-Tiznado ◽  
Jorge Luis García Alcaraz ◽  
Claudia Camargo Wilson ◽  
Blanca Rosa García-Rivera ◽  
...  
Keyword(s):  
Skin Temperature ◽  
Experimental Test ◽  
Thermal Imaging ◽  
Initial Temperature ◽  
Telecommunications Industry ◽  
Repetitive Work ◽  
Infrared Thermal Imaging ◽  
Repetitive Tasks ◽  
Risk Of Injury ◽  
Infrared Thermal Images

The monitoring of infrared thermal images is reported to analyze changes in skin temperature in the hand fingers when repetitive work is performed to know which finger has a greater risk of injury, besides, the recovery time is analyzed regarding the initial temperature and its relationship with age, sex, weight, height if practice sports, and Body Mass Index (BMI) per individual. For the above, an experimental test was carried out for 10 minutes on a repetitive operation that takes place in the telecommunications industry and 39 subjects participated in which an infrared thermal image of the dorsal and palmar part of both hands was taken in periods of 5 minutes after the 10-minute test has elapsed. The results show that none of the participants recovered their initial temperature after 10 minutes of the experimental test. In addition, it was found that there is a relationship between skin temperature and sex, and that age influences the recovery of temperature. On the other hand, the thumb, index, and middle fingers have a higher risk of injury in the analyzed task. It is concluded that performing repetitive work with all the fingers of the hand does not show that all they have the same risk of injury, besides that, not all the variables studied affect the recovery of temperature and its behavior.

Research on Carboform Nondestructive Examination Based on Infrared Thermal Wave

2011 ◽  
Vol 271-273 ◽  
pp. 177-180
Author(s):  
Hai Feng Chang
Keyword(s):  
Edge Detection ◽  
Contrast Enhancement ◽  
Thermal Performance ◽  
Thermal Wave ◽  
Thermal Imaging ◽  
Median Filter ◽  
Performance Difference ◽  
Infrared Thermal Imaging ◽  
Nondestructive Examination ◽  
Infrared Thermal Images

Due to special characteristics of Carboform material, there are many difficulties to exam such material with traditional methods. Infrared thermal imaging technology shoots carboform to obtain infrared thermal images. With variation of time and temperature, the change principle of thermal performance difference of carboform in different temperature can be compared and analyzed. Effective data and reasonable fitting time can be extracted to fit for data with power exponential function. Then, imaging functions were utilized to perform gray change, median filter, fuzzy contrast enhancement, edge detection so as to output images on fitted data. Defects of specimen can be found. Example of some carboform sample based on infrared thermal wave verified feasibility of the proposed method.

scholarly journals Clinical Trial on the Characteristics of Zheng Classification of Pulmonary Diseases Based on Infrared Thermal Imaging Technology

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Jin-xia Ni ◽  
Si-hua Gao ◽  
Yu-hang Li ◽  
Shi-lei Ma ◽  
Tian Tian ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Pulmonary Disease ◽  
Thermal Imaging ◽  
Relative Temperature ◽  
Infrared Thermal Imaging ◽  
Imaging Technology ◽  
Thermal Images ◽  
Diagnosis Rate ◽  
Infrared Thermal Images

Zheng classification study based on infrared thermal imaging technology has not been reported before. To detect the relative temperature of viscera and bowels of different syndromes patients with pulmonary disease and to summarize the characteristics of different Zheng classifications, the infrared thermal imaging technology was used in the clinical trial. The results showed that the infrared thermal images characteristics of different Zheng classifications of pulmonary disease were distinctly different. The influence on viscera and bowels was deeper in phlegm-heat obstructing lung syndrome group than in cold-phlegm obstructing lung syndrome group. It is helpful to diagnose Zheng classification and to improve the diagnosis rate by analyzing the infrared thermal images of patients. The application of infrared thermal imaging technology provided objective measures for medical diagnosis and treatment in the field of Zheng studies and provided a new methodology for Zheng classification.

scholarly journals Smartphone-based infrared thermal imaging for differentiating venomous snakebites from non-venomous and dry bites

2020 ◽  
Author(s):  
Paramasivam Sabitha ◽  
Chanaveerappa Bammigatti ◽  
Surendran Deepanjali ◽  
Bettadpura Shamanna Suryanarayana ◽  
Tamilarasu Kadhiravan
Keyword(s):  
Thermal Imaging ◽  
Infrared Imaging ◽  
Hot Spot ◽  
Body Part ◽  
Night Vision ◽  
Care Providers ◽  
Infrared Thermal Imaging ◽  
Thermal Images ◽  
Thermal Changes ◽  
Infrared Thermal Images

AbstractBackgroundLocal envenomation following snakebites is accompanied by thermal changes, which could be visualized using infrared imaging. We explored whether infrared thermal imaging could be used to differentiate venomous snakebites from non-venomous and dry bites.MethodsWe prospectively enrolled adult patients with a history of snakebite in the past 24 hours presenting to the emergency of a teaching hospital in southern India. A standardized clinical evaluation for symptoms and signs of envenomation including 20-minute whole-blood clotting test and prothrombin time was performed to assess envenomation status. Infrared thermal imaging was done at enrolment, 6 hours, and 24 hours using a smartphone-based device under ambient conditions. Processed infrared thermal images were independently interpreted twice by a reference rater and once by three novice raters.FindingsWe studied 89 patients; 60 (67%) of them were male. Median (IQR) time from bite to enrolment was 11 (6.5—15) hours; 21 (24%) patients were enrolled within 6 hours of snakebite. In all, 48 patients had local envenomation with/without systemic envenomation, and 35 patients were classified as non-venomous/dry bites. Envenomation status was unclear in six patients. At enrolment, area of increased temperature around the bite site (Hot spot) was evident on infrared thermal imaging in 45 of the 48 patients with envenomation, while hot spot was evident in only 6 of the 35 patients without envenomation. Presence of hot spot on baseline infrared thermal images had a sensitivity of 93.7% (95% CI 82.8% to 98.7%) and a specificity of 82.9% (66.3% to 93.4%) to differentiate envenomed patients from those without envenomation. Interrater agreement for identifying hot spots was more than substantial (Kappa statistic >0.85), and intrarater agreement was almost perfect (Kappa = 0.93). Paradoxical thermal changes were observed in 14 patients.ConclusionsPoint-of-care infrared thermal imaging could be useful in the early identification of non-venomous and dry snakebites.Author summaryMost poisonous snakebites cause swelling of the bitten body part within a few hours if venom had been injected. Usually, health care providers diagnose poisonous snakebites by doing a clinical examination and by testing for incoagulable blood. If no abnormalities are found, then the snakebite is diagnosed as a non-poisonous bite or a dry bite. Swelling of the bitten body part results from venom-induced inflammation and is accompanied by local increase in skin temperature. It is possible to capture visual images of these temperature changes by using infrared imaging, the same technology used in night vision cameras. This study found that most persons with poisonous snakebites had hot areas on infrared images while such changes were observed in only a few persons with non-poisonous or dry snakebites. This new knowledge could help doctors identify non-poisonous and dry snakebites early.

Modified Gaussian convolutional deep belief network and infrared thermal imaging for intelligent fault diagnosis of rotor-bearing system under time-varying speeds

2021 ◽  
pp. 147592172199895
Author(s):  
Li Xin ◽  
Shao Haidong ◽  
Jiang Hongkai ◽  
Xiang Jiawei
Keyword(s):  
Thermal Imaging ◽  
Deep Belief Network ◽  
Time Varying ◽  
Infrared Thermal Imaging ◽  
Thermal Images ◽  
Belief Network ◽  
Rotor Bearing ◽  
Infrared Thermal Images ◽  
The Impact ◽  
Bearing System

The vast majority of the existing diagnostic studies using deep learning techniques for rotating machinery focus on the vibration analysis under steady rotating speed. Nevertheless, the collected vibration signals are sensitive to time-varying speeds and the vibration sensors may cause structure damage of equipment after long-term close contact. Aiming at these aforementioned problems, a modified Gaussian convolutional deep belief network driven by infrared thermal imaging is proposed to automatically diagnose different faults of rotor-bearing system under time-varying speeds. First, infrared thermal images are measured to characterize the working states of rotor-bearing system to reduce the impact of changeable speeds. Second, Gaussian units are used to construct Gaussian convolutional deep belief network to well deal with infrared thermal images. Finally, trackable learning rate is designed to modify the training algorithm to enhance the performance. The comparison results verify the feasibility of the proposed method, which outperforms the other methods.

scholarly journals WATER LEAKAGE DIAGNOSIS IN METRO TUNNELS BY INTERGRATION OF LASER POINT CLOUD AND INFRARED THERMAL IMAGING

2018 ◽  
Vol XLII-3 ◽  
pp. 2167-2171
Author(s):  
P. Yu ◽  
H. Wu ◽  
C. Liu ◽  
Z. Xu
Keyword(s):  
Distance Function ◽  
Thermal Imaging ◽  
Point Cloud ◽  
Laser Scanning ◽  
Water Leakage ◽  
Infrared Thermal Imaging ◽  
Centroid Distance ◽  
Metro Tunnel ◽  
Infrared Thermal Images ◽  
Centroid Distance Function

Diagnosis of water leakage in metro tunnels is of great significance to the metro tunnel construction and the safety of metro operation. A method that integrates laser scanning and infrared thermal imaging is proposed for the diagnosis of water leakage. The diagnosis of water leakage in this paper is mainly divided into two parts: extraction of water leakage geometry information and extraction of water leakage attribute information. Firstly, the suspected water leakage is obtained by threshold segmentation based on the point cloud of tunnel. And the real water leakage is obtained by the auxiliary interpretation of infrared thermal images. Then, the characteristic of isotherm outline is expressed by solving Centroid Distance Function to determine the type of water leakage. Similarly, the location of leakage silt and the direction of crack are calculated by finding coordinates of feature points on Centroid Distance Function. Finally, a metro tunnel part in Shanghai was selected as the case area to make experiment and the result shown that the proposed method in this paper can be used to diagnosis water leakage disease completely and accurately.

scholarly journals Daily rhythm of skin temperature of women evaluated by infrared thermal imaging

2018 ◽  
Vol 72 ◽  
pp. 1-9 ◽  
Author(s):  
Carlos Magno Amaral Costa ◽  
Danilo Gomes Moreira ◽  
Manuel Sillero-Quintana ◽  
Ciro José Brito ◽  
Guilherme de Azambuja Pussieldi ◽  
...  
Keyword(s):  
Skin Temperature ◽  
Thermal Imaging ◽  
Daily Rhythm ◽  
Infrared Thermal Imaging

scholarly journals APPRAISAL OF MOISTURE PROBLEM OF INHERITANCE BUILDING ENVELOPE ASSEMBLIES VIA VISIBLE AND INFRARED THERMOGRAPHY METHODS

2015 ◽  
Vol 75 (5) ◽  
Author(s):  
Ting Siew Jing ◽  
Md Azree Othuman Mydin ◽  
Nangkula Utaberta
Keyword(s):  
Infrared Thermography ◽  
Thermal Imaging ◽  
Building Envelope ◽  
Temporary Reduction ◽  
Infrared Thermal Imaging ◽  
Thermal Images ◽  
Heritage Building ◽  
Moisture Performance ◽  
Infrared Thermal Images ◽  
Wall Assembly

In order to gauge the moisture performance of walls and roofs there is a need to investigate the paths of moisture penetrating into the wall assembly, how long and where the moisture stays, and whether it causes temporary reduction of performance or permanent damage. The non-contact safe nature and usefulness in temperature measurement of infrared thermography have made it a popular instrument for building diagnostics. Hence, this paper depicts a documentation process which makes use of both visible and infrared thermal images to identify moisture anomalies in heritage building envelope assemblies. In sequence to achieve the purpose, visible and infrared thermal images are recorded for comparison and further analysis. It can be concluded that infrared thermal imaging camera is useful for identification of moisture problems in building façade, whereas combination of both visible and infrared thermal imaging methods produces a more advanced, accurate and effective approach for building diagnostics.

Detection of Atherosclerosis Through Mapping Skin Temperature Variation Caused by Carotid Atherosclerosis Plaques

2011 ◽  
Vol 3 (3) ◽  
Author(s):  
Yang Yang ◽  
Jing Liu
Keyword(s):  
Surface Temperature ◽  
Skin Temperature ◽  
Thermal Imaging ◽  
Infrared Imaging ◽  
Imaging System ◽  
Human Subjects ◽  
Far Infrared ◽  
Skin Surface ◽  
Skin Surface Temperature ◽  
Infrared Thermal Imaging

This paper reports the effects of atherosclerosis plaque on the human cervicum skin surface temperature. The classical Pennes bioheat equation and a 3-D model consisting of cervical vertebra, muscle, and skin layer is adopted to characterize the heat transfer in the cervicum. Since the formation of atherosclerotic plaque is random, several parametric analyses are conducted to simulate actual situations. A medical far-infrared thermal imaging system is employed on two healthy human subjects to evaluate the feasibility of this technique. According to the simulations, there are variations in the temperature contours on the surface of the skin due to the axial variations in thermal parameters between healthy arterial intimae and atherosclerosis plaque. This suggests that far-infrared thermal imaging can be used to detect the marker safely via a noncontact way. Additional parametric studies indicated that the cervicum skin surface temperature distribution discloses the information regarding the plaque such as position, depth, pattern, quantity, and metabolic heat generation, etc. Furthermore, the external thermal conditions and calm physiological state can be implemented to enhance the detection of the plaque via mapping skin temperature. To test this strategy, a far-infrared imaging system was applied to record the dynamic thermal pictures on the cervicum of two human subjects, and the intentional cooling by the alcohol was proposed to improve detection. The thermograph reveals the surface effects of the main blood vessel and organs in the cervicum. The present study sets up a theoretical foundation for using noncontact far-infrared imaging method for a reliable assessment of atherosclerosis plaque without causing any wound or radiation to human body.

scholarly journals Infrared thermal imaging of human skin temperature during combined simulated hemorrhage and thermal stress

2012 ◽  
Vol 26 (S1) ◽  
Author(s):  
Gilbert Moralez ◽  
Paul Cox ◽  
Rebekah A.I. Lucas ◽  
Matthew S. Ganio ◽  
James Pearson ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Skin Temperature ◽  
Human Skin ◽  
Thermal Imaging ◽  
Infrared Thermal Imaging ◽  
Simulated Hemorrhage

scholarly journals Point-of-care infrared thermal imaging for differentiating venomous snakebites from non-venomous and dry bites

2021 ◽  
Vol 15 (2) ◽  
pp. e0008580
Author(s):  
Paramasivam Sabitha ◽  
Chanaveerappa Bammigatti ◽  
Surendran Deepanjali ◽  
Bettadpura Shamanna Suryanarayana ◽  
Tamilarasu Kadhiravan
Keyword(s):  
Thermal Imaging ◽  
Infrared Imaging ◽  
Hot Spot ◽  
Point Of Care ◽  
Kappa Statistic ◽  
Ambient Conditions ◽  
Infrared Thermal Imaging ◽  
Thermal Images ◽  
Thermal Changes ◽  
Infrared Thermal Images

Background Local envenomation following snakebites is accompanied by thermal changes, which could be visualized using infrared imaging. We explored whether infrared thermal imaging could be used to differentiate venomous snakebites from non-venomous and dry bites. Methods We prospectively enrolled adult patients with a history of snakebite in the past 24 hours presenting to the emergency of a teaching hospital in southern India. A standardized clinical evaluation for symptoms and signs of envenomation including 20-minute whole-blood clotting test and prothrombin time was performed to assess envenomation status. Infrared thermal imaging was done at enrolment, 6 hours, and 24 hours later using a smartphone-based device under ambient conditions. Processed infrared thermal images were independently interpreted twice by a reference rater and once by three novice raters. Findings We studied 89 patients; 60 (67%) of them were male. Median (IQR) time from bite to enrolment was 11 (6.5–15) hours; 21 (24%) patients were enrolled within 6 hours of snakebite. In all, 48 patients had local envenomation with/without systemic envenomation, and 35 patients were classified as non-venomous/dry bites. Envenomation status was unclear in six patients. At enrolment, area of increased temperature around the bite site (Hot spot) was evident on infrared thermal imaging in 45 of the 48 patients with envenomation, while hot spot was evident in only 6 of the 35 patients without envenomation. Presence of hot spot on baseline infrared thermal images had a sensitivity of 93.7% (95% CI 82.8% to 98.7%) and a specificity of 82.9% (66.3% to 93.4%) to differentiate envenomed patients from those without envenomation. Interrater agreement for identifying hot spots was more than substantial (Kappa statistic >0.85), and intrarater agreement was almost perfect (Kappa = 0.93). Paradoxical thermal changes were observed in 14 patients. Conclusions Point-of-care infrared thermal imaging could be useful in the early identification of non-venomous and dry snakebites.

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