光ファイバを用いた赤外線幅射温度計による研削温度の測定

概要

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The heat pulses produced by cutting grains in the grinding zone are measured by some kinds of pyrometers in order to investigate the influence of their response speed on the output. In the infra-red radiation pyrometers (I. R. P.), InAs and PbS cells are used as detectors, and the heat signal is received by an optical fiber at the bottom of a small hole which extended nearly to the ground surface. The results are as follows. Since the ther-mocouple formed by spot welding is inferior in response speed, it cannot catch faithfully the heat pulses and its signal trace versus time is observed as a smooth curve without peaks. However, the trace observed by InAs I. R. P, with the highest speed response has many sharp peaks, because this pyrometer can respond the rapid change of tem-perature. Moreover, the surface temperature esti-mated by extrapolation of measured values is higher in the latter. The thermocouple method devised by Peklenik can also catch the change of temperature, but it is considered to be basically impossible to respond it correctly. As an applica-tion of .InAs I. R, P., the grinding temperature dis-tribution in fine ceramic SisN4 is measured, The peak temperature at 5μm deep below the ground surface is about 550℃, but the surface tempera-ture cannot be estimated because its gradient is very steep near the ground surface.
社団法人精密工学会の論文
1984-12-05