黒体光ファイバ温度計の応答に関する研究 : 第2報, 周波数応答
1992 年 58 巻 548 号 p. 1187-1191
詳細
1992 年 58 巻 548 号 p. 1187-1191
Frequency response of an optical fiber thermometer with a blackbody cavity sensor (OFT) was investigated by Fourier analysis, following the first report on its step response. By using typical data of mass-average gas temperature inside the cylinder of an I.C. engine, analytical simulation was carried out to obtain the gas temperature from the temperature variation indicated by OFT. Such high resolution of OFT with a commercially available size as 0.1°C is found to be necessary for the measurement of gas temperature in an engine. The output signal of OFT should be cut off at the 30th harmonic by a filter, since the larger error in obtaining the gas temperature is caused by the higher frequency noise. A reduction error constant is proposed as a reduction error index.
