Device and method for improving precision of crack sensor through optical splitter
A technology of crack sensor and optical splitter, which is applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of optical power fluctuations in optical links, reduce the measurement accuracy of crack sensors, and achieve the effect of improving measurement accuracy
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Embodiment 1
[0101] Verification experiment of U-shaped winding fiber optic sensor:
[0102] In order to evaluate the effect of adding a beam splitter on the measurement effect of the U-shaped winding crack sensor, two experiments were designed for comparison. In experiment I, there is no optical splitter in the sensing system; in experiment II, an optical splitter is added in the sensing system. For the optical link of test I, see figure 2 . For the optical link and test setup of Test II, see image 3 .
[0103] As shown in Table 1, the measuring range of the optical power meter used in the experiment is +7.00dBm~-70.00dBm. In order to ensure the accuracy of the data, the measurement should be within 2 / 3 of the range, that is, +7.00dBm ~ -44.00dBm. The materials and equipment required in this experiment mainly include: a light source with a working wavelength of 1550nm, an optical power meter, a U-shaped winding optical fiber sensor, a triangular plate, a plexiglass plate, and hot-m...
Embodiment 2
[0126] Verification test of ring fiber optic sensor:
[0127] use figure 2 , image 3 The test device shown in the test was carried out, and the opening of the simulated crack was increased from 0mm, increasing by 4mm each time, and the initial optical power value and the optical power value corresponding to each crack opening were recorded, and the corresponding optical loss value was calculated. For the loss value, the optical loss of the sensor obtained from the calibration test of the optical fiber sensor-crack opening calculation formula respectively calculates the crack opening values measured before and after the ring fiber sensor is added to the optical splitter, and compares it with the simulated real crack opening value. Three independent tests were carried out respectively, and the test results of the ring fiber sensor before and after adding the beam splitter are shown in Table 3 and Table 4 respectively.
[0128] Table 3 The test accuracy test results of the ...
Embodiment 3
[0135] Verification test of butterfly fiber optic sensor:
[0136] use figure 2 , image 3 The test device shown in the test is carried out, and the verification test of the butterfly optical fiber sensor is carried out in the same steps as the experiment of the ring optical fiber sensor. The opening of the simulated crack increases from 0mm and increases by 2mm each time, and the test of the butterfly optical fiber sensor before and after adding the beam splitter is obtained. The results are shown in Table 5 and Table 6, respectively.
[0137] Table 5. Experimental accuracy test results of the butterfly optical fiber sensor with optical splitter
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[0140] Table 6 Test accuracy test results of butterfly optical fiber sensor without optical splitter
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[0142] Analysis of the test data in Table 5 and Table 6 shows that the absolute value of the maximum measurement error of the butterfly fiber sensor before adding the beam splitter is 2.47mm,...
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