Hearth workpiece temperature measuring device and method

Abstract

The invention discloses a hearth workpiece temperature measuring device and a method and mainly aims to realize on-line measurement on an industrial furnace hearth workpiece surface temperature field in the hot working field. The hearth workpiece temperature measuring device comprises an infrared endoscope lens group having a cooling protection sleeve, a high temperature flue gas filter, an infrared heat imaging probe, an automatic lens group rotation driving and reversing mechanism, an infrared heat imaging temperature measurement host, monitoring display equipment and a contact type workpiece surface temperature thermodetector. The hearth workpiece surface temperature field infrared heat imaging temperature measurement system device and the temperature measurement method are realized. According to the device, the infrared heat imaging lens group has the high temperature flue gas filter, so a temperature shielding effect for workpieces in the hearth can be realized through effectively filtering high temperature flue gas. Through a heat pixel temperature system error correction algorithm, a system error can be effectively eliminated, and temperature measurement precision is improved.

Description

technical field [0001] The invention relates to the technical field of engineering detection, in particular to an infrared thermal imaging temperature measurement method and device thereof on the surface temperature field of a furnace workpiece. Background technique [0002] In the actual production process of the thermal processing industry, the surface temperature distribution of the heated workpiece inside the furnace, especially the temperature distribution of the furnace tube wall surface of the direct-fired tubular heating furnace has always been an important technical index that people care about. Therefore, people have been working on solving this problem for many years. The traditional method of monitoring the temperature of the furnace tube wall is to embed thermocouples on the surface of the furnace tube. This method can only detect the temperature of the furnace tube wall at the buried point, and cannot monitor the overall temperature of the heating workpieces in...

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Problems solved by technology

In this method, although a sight glass group is set in the protective sleeve, it is impossible for the lens group to receive infrared and visible light at the same time. Even if only the infrared lens is installed, the attenuation of the infrared radiation of the tested furnace tube is very large, so the measurement error very big

This patent does not set a high-temperature flue gas filter, which cannot eliminate the heat shielding effect of the flue gas on the furnace tube, and the temperature measurement result cannot reflect the real situation of the temperature distribution of the furnace tube surface in the furnace

In addition, since the system does not set up a contact point thermometer to correct the error of the infrared thermal image temperature measurement, this measurement method also has a large temperature measurement error

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