An intelligent optical fiber tactile sounding system, comprising a flexible optical fiber tactile sensing array, a photoelectric detection system, an intelligent pressure analysis software and an acoustic emission system, wherein the optical fiber tactile sensing array is constructed by embedding a fiber-core mismatched optical fiber interferometric sensor with an asymmetrical structure into a flexible substrate material, and performing region division on the flexible substrate material around an optical fiber sensor;
- and the photoelectric detection system records spectral information output by the fiber-core mismatched optical fiber interferometric sensor, identifies and determines the spectral information by the intelligent pressure analysis software, and then sends an instruction to drive a hardware to generate sound;
- the flexible optical fiber tactile sensing array is manufactured through the following steps:
- at step a, using polydimethylsiloxane (PDMS) or silica gel as the flexible substrate material, and selecting the fiber-core mismatched optical fiber interferometric sensor;
- at step b, pre-treating the above flexible substrate material;
- at step c, placing the fiber-core mismatched optical fiber interferometric sensor while avoiding overlapping with a center line of a mould, wherein a distance between each end of the fiber-core mismatched optical fiber interferometric sensor and the center line is d;
- and then, placing the flexible substrate material in the mould;
- at step d, placing the mould at step c in a thermostat for curing to package the fiber-core mismatched optical fiber interferometric sensor in the flexible substrate material, and protecting an optical fiber outlet with a plastic cover;
- and
- at step e, with the fiber-core mismatched optical fiber interferometric sensor as a sensing element, constructing a distributed tactile sensor on the flexible substrate material by performing region division;
- wherein an intelligent optical fiber tactile sounding method using the intelligent optical fiber tactile sounding system, comprising the following steps:
- at step 1, applying a pressure to each of multi-tactile sensitive regions of the distributed tactile sensor to change interference spectrum of an internal sensing structure, and transmitting, by the fiber-core mismatched optical fiber interferometric sensor, the spectral change to the photoelectric detection system in the form of optical signals;
- at step 2, storing, by the photoelectric detection system, these pressure signals in the form of digital signals, and inputting these pressure signals into the intelligent pressure analysis software;
- and
- at step 3, determining, by the intelligent pressure analysis software, a region and a size of a tactile source, and sending an instruction to the acoustic emission system to enable the acoustic emission system to emit different sounds;
- wherein an output light intensity of the fiber-core mismatched optical fiber interferometric sensor at step 1 is as follows:
- I=Ico+Icl+2√{square root over (IcoIcl)} cos Δφ;
- where, Ico and Icl refer to transmission light intensities in an optical fiber core and a cladding respectively, and Δφ refers to a phase difference;
- and
- a strain sensitivity of an optical fiber MZI is as follows:
- Δ
-
- λ
- /
- ε
- =
- λ
-
- (
- 1
- -
- P
- e
- c
-
- o
-
- r
-
- e
-
- n
- eff
- c
-
- o
-
- r
-
- e
- -
- P
- e
- clad
-
- n
- eff
- clad
- Δ
-
- n
- eff
- )
- ;
- where, Pecore and Peclad refer to effective photoelastic coefficients (positive values) of the optical fiber core and the cladding respectively, λ refers a propagation wavelength of an optical wave in an optical fiber, Δλ refers to a wavelength drift amount, ε refers to an axial strain, neffcore and neffclad refer to effective refractive indexes of a fiber core mode and a cladding mode respectively, and Δneff refers to a change of the effective refractive index.