Tilt fiber bragg grating (TFBG) liquid level change measuring instrument
A technology of tilting fiber gratings and measuring instruments, which is applied in the field of sensing to achieve high precision, low cost and good repeatability
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[0017] A tilted fiber grating liquid level change measuring instrument, including light source 1, two optical splitters a, b 2-I, 2-II, tilted fiber grating 3, spectrum analyzer 5, two photodetectors a, b6 -I, 6-II and single-mode optical fiber 7 for connection; light source 1 is connected with optical splitter a2-I through single-mode optical fiber 7, and one end of optical splitter a2-I is used as a reference arm through single-mode optical fiber 7 and photoelectric detection The other end is connected in series with the inclined fiber grating 3 and the optical splitter b2-II respectively through the single-mode optical fiber 7, one end of the optical splitter b2-II is connected with the spectrum analyzer 5, and the other end is connected with the photodetector b6-II is connected; the inclined fiber grating 3 is located at the liquid level of the measured container 4, and cannot be placed horizontally, and the upper end of the inclined fiber grating 3 must protrude from the l...
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