scholarly journals An investigation of the Temperature Distribution of a Thin Steel Strip during the Quenching Step of a Hardening Process

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 675 ◽  
Author(s):  
Pouyan Pirouznia ◽  
Nils Å. I. Andersson ◽  
Anders Tilliander ◽  
Pär G. Jönsson
Keyword(s):  
Temperature Distribution ◽  
Numerical Model ◽  
Thermal Imaging ◽  
Steel Strip ◽  
Imaging Data ◽  
Infrared Thermal Imaging ◽  
Hardening Process ◽  
Real Process ◽  
Significant Temperature

The dimension quality of the strip within the hardening process is an essential parameter, which great attention needs to be paid. The flatness of the final product is influenced by the temperature distribution of the strip, specifically across the width direction. Therefore, based on physical theories, a numerical model was established. The temperature of the strip for the section before the martensitic transformation was objected in the predicted model by using a steady state approach. In addition an infrared thermal imaging camera was applied in the real process in order to validate the results and to improve the boundary conditions of the numerical model. The results revealed that the temperature of strip decreased up to 250 °C within the area between the furnace and the quenching bath. This, in turn, resulted in significant temperature difference across the width of the strip. This difference can be up to 69 °C and 41 °C according to the numerical results and thermal imaging data, respectively. Overall, this study gave a better insight into the cooling step in the hardening process. In addition, this investigation can be used to improve the hardening process as well as an input for future thermal stress investigations.

scholarly journals INFRARED THERMAL IMAGING AS AN INNOVATIVE APPROACH FOR EARLY DETECTION INFESTATION OF STORED PRODUCT INSECTS IN CERTAIN STORED GRAINS

2020 ◽  
Vol 52 (4) ◽  
pp. 321-331
Author(s):  
A. I. IBRAHIM ◽  
M. A. YOUSRY ◽  
M. I. SAAD ◽  
M. F. MAHMOUD ◽  
Maysa SAID ◽  
...  
Keyword(s):  
Early Detection ◽  
Thermal Imaging ◽  
Large Scale ◽  
Negative Impact ◽  
Imaging Data ◽  
Infrared Thermal Imaging ◽  
Stored Product Insects ◽  
Stored Grains ◽  
White Bean

Grains of field crops, such as wheat, maize, faba bean and white bean, are considered strategic food for humanity worldwide and Egypt. Unfortunately, percent losses of grains quantity may reach to 15-30%, as a result of stored product insect damage, and the losses increased dramatically in the last years, as an outcome of quickly productions of these pests. Experiments were conducted on infrared thermal imaging that demonstrate early detection of infestation by stored product insects in wheat, maize, broad bean, white bean and bean grains. The imaging is dependent on subtle significant differences in temperature between infested and healthy grains. Because the thermal imaging data are digital, computer programs can be used to analysis differences in temperature and mining figures explained for that. Results revealed that the use of thermal imaging offers an alternative method to detect an insect infestation. Data concluded that thermal imaging has the potential to identify whether the grains of crops that tested are infested or not, but is less effective in identifying which developmental stage is present. Moreover, it could apply this technique easily on a large scale in silos, storage, mills and granaries without negative impact on quality of stored grains.

scholarly journals Validation Study of Kim's Sham Needle by Measuring Facial Temperature: An N-of-1 Randomized Double-Blind Placebo-Controlled Clinical Trial

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Sanghun Lee ◽  
Nara Lim ◽  
Sun Mi Choi ◽  
Sungchul Kim
Keyword(s):  
Thermal Imaging ◽  
Controlled Clinical Trial ◽  
Double Blind ◽  
Infrared Thermal Imaging ◽  
Double Blind Placebo ◽  
Control Intervention ◽  
Significant Difference ◽  
Double Blinded ◽  
Stimulation Of

Introduction. In 2008, Kim's sham needle was developed to improve the quality of double-blinded studies. The aim of this study is to validate Kim's sham needle by measuring facial temperature.Methods. We designed “N-of-1” trials involving 7 smokers. One session was composed of 2 stimulations separated by a 2 h washout period. Six sessions were applied daily for all subjects. Infrared thermal imaging was used to examine the effects of acupuncture (HT8, KI2) on facial temperature following smoking-induced decrease.Results. All subjects demonstrated decreased temperatures after sham needle treatment, but 5 of the 7 subjects showed increased temperatures after real needle treatment. 6 of the 7 subjects showed a significant difference(P<0.05)between treatments with real and sham needles. Thus, the physiological stimulation of Kim's sham needle is different from that of a real needle, suggesting that Kim's sham needle is a potential inactive control intervention.

scholarly journals Numerical study on temperature field of the sandwich plate defects based on MATLAB

2020 ◽  
Vol 143 ◽  
pp. 01003 ◽  
Author(s):  
Ruoyang Zhou ◽  
Xiaoxiong Zha ◽  
Chao Wang
Keyword(s):  
Temperature Field ◽  
Thermal Imaging ◽  
Sandwich Plate ◽  
Numerical Study ◽  
Heating Time ◽  
Thickness Direction ◽  
Processing Quality ◽  
Infrared Thermal Imaging ◽  
Different Thickness

As for the defects of the plate whose length and width are more than 8 times larger than the thickness direction, the finite difference numerical calculations are carried out by using the software of MATLAB. The surface temperature of defects in different positions, different thickness defects, different heating heat flow and heating time, and defects under defects are analyzed correspondingly by the program. According to the temperature difference results of the flawless surface and the flawed surface, the feasibility of infrared thermal imaging to detect the defects of the sandwich plate is analyzed to ensure the processing quality of the sandwich plate.

scholarly journals Temperature Measurement Technologies and Their Application in the Research of Fuel Cells

2003 ◽  
Author(s):  
Mao Hai Wang ◽  
Hang Guo ◽  
Chong Fang Ma ◽  
Fang Ye ◽  
Jian Yu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Temperature Distribution ◽  
Thermal Imaging ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Temperature Fields ◽  
Infrared Thermal Imaging ◽  
Exterior Surface ◽  
Temperature Distributions ◽  
Exchange Membrane

Fuel cells have attracted extensive attention throughout the world in recent years for their high efficiency and high environmental compatibility. Temperature plays a key role in achieving high performance of fuel cells because it deeply influences the activity of catalyst, dehydration of solid polymer membrane, mass transfer and heat management of fuel cells. The temperature distribution has close relationship with current density distribution and lifetime of fuel cells because the uniformity of temperature distribution is a quite important problem for fuel cells. In this paper, a review of temperature measurement technologies that can be used to measure temperature distribution of fuel cells was presented. The measurement of cathode exterior surface temperature fields of a hydrogen proton exchange membrane fuel cell under various operational conditions was conducted by using the technology of infrared thermal imaging. The proton exchange membrane fuel cell structure was designed for uniformity of input heat. A NEC TH5102 thermo tracer was applied to measure the cathode exterior surface temperature distributions of the cell with 5cm2 active area. The experimental results showed that the infrared thermal imaging is an effective method to measure the exterior temperature fields of the PEMFC. The cathode temperature distributions of the cell varied with cell temperatures and flow rates.

scholarly journals Effects of salicylic acid elicitor against aphids on wheat and detection of infestation using infrared thermal imaging technique in Ismailia, Egypt

2015 ◽  
Vol 30 (2) ◽  
pp. 91-97 ◽  
Author(s):  
Farag Mahmoud ◽  
Hatem Mahfouz
Keyword(s):  
Salicylic Acid ◽  
Thermal Imaging ◽  
Insect Pests ◽  
Foliar Application ◽  
Imaging Technique ◽  
Wheat Yield ◽  
Yield Reduction ◽  
Imaging Data ◽  
Infrared Thermal Imaging ◽  
Aphid Infestation

Wheat (Triticum sativum L.) is one of the most important cereal crops in Egypt. Insect pests, such as aphids, are major threats in terms of yield reduction. Induced resistance in wheat using salicylic acid as a foliar application was tested on the farm of the Faculty of Agriculture, Suez Canal University during 2012/2013 and 2013/2014 seasons. Three wheat cultivars, Gemeza 9, Sakha 93 and Giza 168, were sprayed three times with two concentrations of salicylic acid (SA), 200 mg/l and 100 mg/l, after early detection of aphid infestation by infrared thermal imaging. The infrared thermal imaging technique is based on significant differences in surface temperature between infested and healthy leaves. Imaging data are digital, and a computer program can be used to detect infestation rapidly. The results showed that aphid infestation raised the temperature of infested leaves, compared to healthy leaves. The range temperature difference between maximum and minimum temperatures (At) was 1.1 ?C in healthy leaves and 3.9 ?C in infected leaves. The results of SA application showed significant differences in the mean number of aphids and in reduction of infestation among treatments and cultivars. The higher of the two SA rates (200 mg/l) gave higher efficacy in the three cultivars than the lower rate (100 mg/l) over the five weeks of trial. The highest efficacy against aphids was reached one week after application (86.28% for Giza, 85.89% for Gemesa and 70.54% for Sakha). Moreover, SA treatment enhanced the wheat yield of all three cultivars, compared with control plants. The three cultivars (Giza, Gemesa and Sakha) produced higher yields than the control when sprayed with 200 mg/l SA. Their grain yield was 2,491.5, 2,455.0, and 2,327.25 kg/feddan (1 fed = 0.42 ha), respectively. In conclusion, infrared thermal imaging can be employed in identification of infected leaves. Also, the application of SA on wheat induced plant resistance to aphids.

Quantitative Three-Dimensional Imaging of Heterogeneous Materials by Thermal Tomography

2016 ◽  
Vol 138 (11) ◽  
Author(s):  
J. G. Sun
Keyword(s):  
Thermal Imaging ◽  
Three Dimensional ◽  
Heterogeneous Materials ◽  
Thermal Effusivity ◽  
Test Sample ◽  
Imaging Data ◽  
Entire Volume ◽  
Multilayer Material ◽  
Infrared Thermal Imaging ◽  
Thermal Tomography

Infrared thermal imaging based on active thermal excitations has been widely used for nondestructive evaluation (NDE) of materials. While the experimental systems have remained essentially the same during the last few decades, development of advanced data-processing methods has significantly improved the capabilities of this technology. However, many limitations still exist. One fundamental limitation is the requirement, either explicitly or implicitly, of the tested material to be homogeneous such that detected thermal contrasts may be used to determine an average material property or attributed to flaws. In this paper, a new thermal tomography (TT) method is introduced, which for the first time can evaluate heterogeneous materials by directly imaging their thermal-property variations with space. It utilizes one-sided flash thermal-imaging data to construct the three-dimensional (3D) distribution of thermal effusivity in the entire volume of a test sample. Theoretical analyses for single and multilayer material systems were conducted to validate its formulation and to demonstrate its performance. Experimental results for a ceramic composite plate and a thermal barrier coating (TBC) sample are also presented. It was shown that thermal diffusion is the primary factor that degrades the spatial resolution with depth for TT; the spatial resolutions in the lateral and axial directions were quantitatively evaluated.

Far-Infrared Imaging Method for Non-Contact Monitoring of Ice Valve Array in Controlling Micro/Nano Fluidics

2011 ◽  
Author(s):  
Yang Yang ◽  
Jing Liu
Keyword(s):  
Temperature Distribution ◽  
Convenient Method ◽  
Thermal Imaging ◽  
Infrared Imaging ◽  
Imaging System ◽  
Far Infrared ◽  
Imaging Method ◽  
Infrared Thermal Imaging ◽  
Surface Temperature Distribution ◽  
Thermal Imaging System

Ice valve is a unique kind of micro valve without any moving elements and leakage. While in its operational process, appropriate control on the valve depends on well knowing the working statues of the valve system. In order to develop a quick and convenient method for guiding the operation of the ice valve, this paper is dedicated to establish a non-contact image way for monitoring the ice valve during controlling the micro fluid. The far-infrared thermal imaging system was adopted to detect and map the surface temperature distribution of the ice valve, which consequently could help achieve the non-contact monitoring of the ice valve.

Infrared thermal imaging denoising method based on second-order channel attention mechanism

2021 ◽  
pp. 103789
Author(s):  
Zhuo Li ◽  
Shaojuan Luo ◽  
Meiyun Chen ◽  
Heng Wu ◽  
Tao Wang ◽  
...  
Keyword(s):  
Thermal Imaging ◽  
Second Order ◽  
Attention Mechanism ◽  
Denoising Method ◽  
Infrared Thermal Imaging

scholarly journals Thermal Characteristics of Breast Surface Temperature in Healthy Women

2021 ◽  
Vol 18 (3) ◽  
pp. 1097
Author(s):  
Anna Lubkowska ◽  
Monika Chudecka
Keyword(s):  
Mammary Gland ◽  
Temperature Distribution ◽  
Surface Temperature ◽  
Thermal Characteristics ◽  
The Body ◽  
Imaging Method ◽  
Infrared Thermal Imaging ◽  
Ir Camera ◽  
Entire Area ◽  
Healthy Women

Thermography is widely used in the medical field, including in the detection of breast disorders. The aim of the research was to characterize the range of breast surface temperature values, taking into account the entire area of the mammary gland and, independently, the nipple, in healthy women. An additional aim was to assess the symmetry of the breast temperature distribution (using an IR camera) and the correlation of temperatures with the content of adipose tissue. Thermograms were made for the right and left breasts, each time delineating the area of the entire breast and a separate area of the nipple, chest, and abdomen. Analyzing the intergroup differences in temperature of selected body areas (Tmean), it was shown that, in all cases, they were significantly higher in younger women. Statistical analysis showed no significant differences between breast and nipple temperatures in relation to the body sides. The highest temperatures within the mammary gland were recorded for the nipple area. The use of the high-resolution digital infrared thermal imaging method in early and screening preventive diagnoses of changes in the mammary gland requires individual interpretation of the results, taking into account the assessment of the physiological pattern of temperature distribution in both breasts.

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