The invention discloses an
automatic control heat source specially-produced single-mode
fiber for
hydraulic engineering seepage monitoring. The
fiber sequentially includes, from inside to outside, a
single core fiber, an inner protection elastic layer, a heat insulation steel ring, an inner-layer filling ring, an elastic hard ring and an antiseepage heat insulation hard sleeve ring. The
single core fiber is connected to a plurality of outer circular guard pipes. The outer circular guard pipes sequentially pass through the inner protection elastic layer, the heat insulation steel ring, the inner-layer filling ring and the elastic hard ring to be connected with the antiseepage heat insulation hard sleeve ring. Each outer circular guard
pipe is filled with a drainage
water storage cotton sleeve, the drainage
water storage cotton sleeve is connected to a second filter screen, and the second filter screen is connected to a first filter screen. The inner protection elastic layer, the heat insulation steel ring, the inner-layer filling ring, the elastic hard ring and the antiseepage heat insulation hard sleeve ring are disposed outside the
single core fiber, so automatic temperature changing of the single core fiber can be achieved. Moreover, a great
temperature difference is formed between the single core fiber and an environment, so the seepage identification level and the practicality can be substantially improved when the fiber is applied to seepage monitoring.