FIBER LIQUID DETECTOR

摘要

PROBLEM TO BE SOLVED: To provide a fiber sensor capable of simply detecting a liquid highly stably in a non-contact state. SOLUTION: One end of two branched bundle fibers is attached to a scanning device 9 to two dimensionally scan the waterdrop placed on a copper plate 18. Exciting light and fluorescence are split by a beam splitter 10 and the exciting light is detected by a photodetector (exciting light) 15 having sensitivity only to exciting light to obtain an output signal. The fluorescence is condensed by a lens 12 to pass through a filter 19 removing only exciting light and only a fluorescence signal is detected by a photodetector 13. The obtained voltage signal is amplified by a signal amplifier 14 to obtain an output signal 17. By calculating the ratio of the obtained output signals 16, 17, the attenuation of fluorescence can be estimated and a waterdrop and other liquid can be discriminated.