Infrared Sensing by Intelligent Functional Fibers

为了开发具有高速响应和稳定感知固定目标等智能功能的红外传感器的纤维材料和器件，进行了其他研究。此外，还对光纤红外传感器在实际应用中的可行性进行了验证。测定了两种不同原料的碳纤维和碳化硅纤维的电性能。电阻率较高的半导体光纤具有较大的热敏电阻常数，输出电压随热敏电阻常数的增大而增大。在相同的电阻率下，PAN（聚丙烯腈）基碳纤维比沥青基碳纤维和SiC纤维具有更高的热敏电阻常数。采用不同直径（7 ~ 130微米）的SiC和pan基碳纤维单纤维对传感器元件的红外传感性能进行了测试。随着纤维直径的减小，响应时间延长（热时间常数减小）。随着红外光源辐射能量的增加和周围温度的降低，光电电压随之升高。pan基碳纤维，电阻率在200欧姆以上。cm和一个热敏电阻常数高于2100 K，检测到一个红外辐射从一个手。在室温下有稳定的输出电压。pan基碳纤维通过表示正输出或负输出来区分两种温度高于或低于室温的光源。电压,respectively.4。采用热容较大的金属板和保温覆盖膜，提高了传感性能的稳定性。本文讨论了在具有多个电极的长连续光纤传感器元件上对红外源位置和红外源形状的人工识别问题。

Investigation was carried otit iii order to develop fiber materials and devises for IR sensors with intelligent functions, such as a high-speed response and stable sensing of immobile targets. In addition, feasibility for practical tise was examined with the fiber IR sensor.1. Electrical properties were measured for two kinds of carbon fibers with different raw materials and SiC fiber. The semiconducting fiber with a higher resistivity showed a larger thermistor constant, and the output voltage increased with increasing thermistor constant. A PAN (polyacrylonitrile)-based carbon fiber showed a higher thermistor constant than Pitch-based carbon and SiC fibers at a same electrical resistivity.2. IR sensing properties were examined ori sensor elements using monofiber of SiC and PAN-based carbon fibers with different diameters (7 to 130 micrometers). Response time was improved (thermal time constant was decreased) with decreasing fiber ifiameter. The otitpijt voltage increased with increasing radiation energy of IR source and with decreasing surrounding temperature.3. PAN-based carbon fiber, liaviiig a resistivity above 200 ohm. cm and a thermistor constant above 2100 K, detected an IR radiation from htimaii hand wit. 1i a steady output voltage at room temperature. PAN-based carbon fibers distinguished two kinds of lit source, whose body-temperattire was higher or lower than room temperature, by representing a positive or negative otitput. voltage, respectively.4. Stability of sensing property was improved by applying a metal plate with a large heat-capacity and a thermal insulating cover-film to a seristing cleineiit. 1--tifictioiis of recognition of IR-source position and IR-source shape were discussed on a sensor element using a long, contijitious fiber provided with many electrodes.