Non-Contact Type Temperature Measurement of Running Thin Lines

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  • 細い移動物体の非接触測温法
  • ホソイ イドウブツタイ ノ ヒ セッショク ソクオンホウ

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A new method of non-contact type temperature measurement of the running thin lines (e.g. yarns, fibers, and wires) is developed.<br>In this method, Scanning allows line vibration.<br>The measuring error caused by the emissivity which is less than unity doesn't occur by use of Zero-method.<br>The high temperature resolution and the narrow field of view of the radiometer increase the accuracy of measurement. The radiometer isn't required to have high stability.<br>A temperature controllable radiator, which is made with the same material of the running thin line, is settled at the back of the line. In a scan across the line, one pulse is produced as a radiometer output which level is proportional to the temperature difference between a line and a background radiator. Temperature of the background radiator should be controlled to fade the pulse. When the pulse disappears, temperature of the line is equal to that of the background radiator.<br>In the experiments, the radiometer whose spectral band is 8∼14 [μm] has 0.01[K] temperature resolution and 40 [mrad] angular field of view, and is settled at a distance of 1[m] from the 1.06[mmφ] wire. For a high emissive object (ε=0.955), the measuring error is ±0.2[K]. For a low emissive object (ε=0.204), the measuring error is ±1.0[K] in using a domy radiator which makes environmental temperature uniform.

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