In this paper, the kinetic equation of photo-initiated reaction was set up by measuring the photoinitiator absorbency
and the exposure time during the exposure process based on the spectroscopic analysis and reaction kinetics. And an
effective and convenient computation model for quantum yields of photoinitiators was established through further
analysis of the exposure process. The kinetics curve of photoinitiator 1173 (HMPP) was determined according to this
method. The results show that the reaction is consistent with the kinetic model established in this paper. And the
quantum yield is 2.4% at the main absorption peak (247nm).
The paper presents a novel fiber optic microbend sensor with intelligent self-healing function, which is based upon
the photocurable technology and the mode-coupling theory. In the research, a kind of photocurable material is developed
and injected into the flexible hollow-center fiber embodying the sensitive optic fiber. According to the theory of fiber
optic microbend sensors, the microbending mechanism causes part of the optical power to be radiated out of the fiber due
to the mode-coupling. Especially when the damage of the sensitive optic fiber occurs due to the extremely small bending
radius, the radiation power will increase rapidly. We use the radiation power as the curing light to initiate the
photopolymerization of the photocurable material surrounding the sensitive optic fiber. The scale and speed of the
photochemistry reaction mainly depend on the radiation power and the microbend degree. By this way, the photocurable
material can repair the damaged area in real time according to the damaged state. This paper describes the design and
performances of the intelligent self-healing fiber optic microbend sensor in detail. The experimental results reveal that
the sensor has the excellent sensing property and can adjust its repairing ability according to the damaged degree
automatically.
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