Abstract
In this paper, a novel differential reflective intensity optical fiber angular displacement sensor was proposed. This sensor can directly measure the angular and axial linear displacement of a flat surface. The structure of the sensor probe is simple and its basic principle was first analyzed according to the intensity modulation mechanisms. Secondly, in order to trim the dark output voltage to zero, the photoelectric conversion circuit was developed to adjust the signals. Then, the sensor model including the photoelectric conversion circuit has been established, and the influence of design parameters on the sensor output characteristic has been simulated. Finally, the design parameters of the sensor structure were obtained based on the simulation results; and an experimental test system was built for the sensor calibration. Experimental results show that the linear angular range and the sensitivity of the sensor were 74.4 and 0.051 V/°, respectively. Its change rules confirm the operating principle of the sensor well.
Highlights
Fiber-based devices are widely studied for the advantage in their response to many physical parameters such as displacement, pressure, temperature and electric field [1,2,3]
To verify the performance of the optical angular displacement sensor we have designed, a static measurement experiment system was built as shown as Figure 13
When the system is working, the 650 nm light irradiates on the angular displacement change platform though Emitting fiber (EF), the light is reflected by the plane and received by RFa, RFb, RFLeft and RFRight, and the received light was converted into voltage signals by photoelectric conversion circuit, after that the voltage signal was transmitted to the computer by DAQ module
Summary
Key Laboratory of Road Construction Technology and Equipment, Chang’an University, Xi’an 710064, China. Academic Editors: Manuel Lopez-Amo, Jose Miguel Lopez-Higuera and Jose Luis Santos. Received: 14 July 2016; Accepted: 8 September 2016; Published: 16 September 2016
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