A kind of surface emissivity online testing device and method

Abstract

The invention relates to a surface emissivity online testing device and method. The device comprises a film with calibrated emissivity, a heating unit, a sensor module and a control processing unit, wherein the film is attached to a to-be-measured local surface of a to-be-measured target object during testing, the heating unit is used for increasing the surface temperature of the tested target object during testing, the sensor module is used for synchronously measuring infrared radiation of a surface of the film and a to-be-measured local surface of the measured target object, converting the infrared radiation into the temperature information and acquiring the temperature information of the sensor module, and the control processing unit is connected with the heating unit and the sensor module, and is used for supplying power and outputting data, and obtaining emissivity of the to-be-measured local surface on the measured target object according to the obtained temperature information.Compared with the prior art, the device has advantages of short measurement time, no need of slicing the sample, simple structure, low cost, easiness in field test, and is suitable for on-line rapid measurement of the surface emissivity of various materials.

Description

technical field [0001] The invention relates to a surface emissivity measurement technology, in particular to an online surface emissivity testing device and a method thereof. Background technique [0002] Surface emissivity (also known as emissivity, blackness coefficient, etc.) is a physical quantity that characterizes the radiation ability of a material surface. It is an important thermophysical parameter and has important applications in many industrial and scientific research fields. For example, in the application of non-contact infrared temperature measurement or infrared temperature imaging, accurately setting the emissivity of the surface of the target object is a prerequisite for ensuring the accuracy of temperature measurement. [0003] In addition, in many applications involving emissivity measurement, it is usually desired that the emissivity test can be measured quickly and online, and it is not desirable to perform destructive slice sampling of the target obje...

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Problems solved by technology

[0005] Traditional measurement devices based on calorimetry generally use steady-state measurement, which takes a long time and requires high precision for various parameters such as temperature and heat capacity, and cannot be measured online

Chinese patent CN104865287A discloses a device for quickly measuring the emissivity of the infrared hemisphere on the surface, but the device requires two constant temperature cavities that maintain different temperatures, and also requires a rotating machine combined with a lock-in amplifier and other devices for measurement. The measurement process and the design of the device more complicated structure

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