Improved in-situ calibration applied to infrared thermography under high angles of view

Schmid, Jochen; Bicat, Dogan; Elfner, Maximilian; Bauer, Hans‐Jörg

doi:10.1016/j.infrared.2021.103952

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…This temperature will be equal to the actual temperature only when a radiation coefficient close to that of a blackbody and the object is in conditions where the influence of the atmosphere and the accompanying background can be ignored. Such conditions are difficult to reach in industrial enterprises and in the measurements of industrial objects there are often prerequisites for admission of methodological error [9]. This error is significant when measuring objects with high reflection and temperatures close to the temperatures of the environment.…”

Section: Energymentioning

confidence: 99%

Experimental determination of the heat exchange coefficient of industrial steam pipelines

et al. 2022

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The article discusses and analyses the factors related to the use of a thermal imaging camera to determine heat loss in industrial steam pipelines at factories from chemical and metallurgical industry, by measuring their surface temperature. The generally accepted enthalpy method for determination of the loss has serious drawback it gives accurate results, but in averaged units in which it is impossible to take account of the contribution of the different parts and components of the pipeline in the total heat loss. The unavailability of information on where, how and in what way along the route this loss is formed does not allow prompt and specific measures to be taken for its reduction. An attempt has been made to structure empirically a reliable analytic dependence for determination of the heat exchange coefficient, bringing together the various factors influencing the heat exchange. By the method of the least squares the free coefficient and the exponent have been determined of criterion equation satisfying initial and boundary conditions of the experiment. Based on the obtained results for determining the heat losses by measuring the surface temperature of steam pipelines with a thermal imaging system, a reliable and acceptable method is proposed, which has a place in engineering practice. For this purpose, an industrial experiment has been carried out at three actually operating steam pipelines of different diameters and steam parameters. A criterion equation has been derived that can be used as a mathematical model for software products with a practical orientation for regular assessment of heat losses of steam pipelines. Values of heat losses determined through energy balance of heat carrier and heat flux from the outer surface of the steam pipelines have been compared. Results for the heat exchange coefficient, obtained through a balance have been compared with the analytically determined values based on current standards. A new method has been developed for express evaluations of the current heat losses of the steam pipeline in real time, as the sum of the losses through its individual components gives as average values 9÷12 % increased results for the losses compared to the enthalpy method. Its great advantage is that it can be used selectively to determine the losses through individual sections of the steam pipeline.

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Section: Energymentioning

confidence: 99%

Experimental determination of the heat exchange coefficient of industrial steam pipelines

et al. 2022

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“…Infrared thermography technology faces various complex factors in practical applications, including emissivity, measurement distance, angle selection, atmospheric transmittance, and size effect (SSE). Especially in curved surface temperature measurement, the characteristics of coating emissivity varying with viewing angle lead to large errors in temperature measurement results [8]. To accurately measure the temperature in curved areas, it is necessary to comprehensively consider the projection relationship between the curved surface and the horizontal plane and then estimate the thermal conduction term.…”

Section: Introductionmentioning

confidence: 99%

Wireless Temperature Measurement for Curved Surfaces Based on AlN Surface Acoustic Wave Resonators

Liu,

Zhou,

Lou

2024

Micromachines

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In this paper, we propose a novel method for temperature measurement using surface acoustic wave (SAW) temperature sensors on curved or irregular surfaces. We integrate SAW resonators onto flexible printed circuit boards (FPCBs) to ensure better conformity of the temperature sensor with the surface of the object under test. Compared to traditional rigid PCBs, FPCBs offer greater dynamic flexibility, lighter weight, and thinner thickness, which make them an ideal choice for making SAW devices working for temperature measurements under curved surfaces. We design a temperature sensor array consisting of three devices with different operating frequencies to measure the temperature at multiple points on the surface of the object. To distinguish between different target points in the sensor array, each sensor operates at a different frequency, and the operating frequency bands do not overlap. This differentiation is achieved using Frequency Division Multiple Access (FDMA) technology. Experimental results indicate that the frequency temperature coefficients of these sensors are −30.248 ppm/°C, −30.195 ppm/°C, and −30.115 ppm/°C, respectively. In addition, the sensor array enables wireless communication via antenna and transceiver circuits. This innovation heralds enhanced adaptability and applicability for SAW temperature sensor applications.

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Background radiation compensation calibration method for film cooling infrared temperature measurement based on BP neural network

Li,

Liu,

Meng

et al. 2024

International Communications in Heat and Mass Transfer

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Improved in-situ calibration applied to infrared thermography under high angles of view

Cited by 5 publications

References 16 publications

Experimental determination of the heat exchange coefficient of industrial steam pipelines

Experimental determination of the heat exchange coefficient of industrial steam pipelines

Wireless Temperature Measurement for Curved Surfaces Based on AlN Surface Acoustic Wave Resonators

Background radiation compensation calibration method for film cooling infrared temperature measurement based on BP neural network

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