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Fabrication of the designed acoustic sensor. (a) Schematic of the designed acoustic sensor (top, not to scale) with a low-coherence fiber optic interferometer (LCFOI) system (bottom). (b) 3D printed substrate. (c) Photo of the integrated sensor prototype.
Source publication
A bio-inspired acoustic sensor for sound source localization is presented, mimicking the internally coupled ears found in many terrestrial vertebrates and insects. It consists of two aluminum diaphragms coupled by a U-shaped cavity and detected by a low-coherence fiber optic interferometer system. A large-scale prototype with a center-to-center sep...
Contexts in source publication
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... on the simulation results, d 2 ¼ 8 mm is chosen for fabricating a large-scale bio-inspired sensor. Figure 2(a) shows the cross section view of the sensor along with a low-coherence fiber optic interferometric (LCFOI) system 18 for detecting the center deflections of the diaphragms. First, the substrate is 3D printed and two ceramic ferrules (Thorlabs CFLC128, ID: 128 lm) are press fitted into the two center holes, serving as guides for inserting the optical fibers in a later step [see Fig. 2(b) for a photo after the completion of this step]. ...
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... the sensor along with a low-coherence fiber optic interferometric (LCFOI) system 18 for detecting the center deflections of the diaphragms. First, the substrate is 3D printed and two ceramic ferrules (Thorlabs CFLC128, ID: 128 lm) are press fitted into the two center holes, serving as guides for inserting the optical fibers in a later step [see Fig. 2(b) for a photo after the completion of this step]. Then aluminum foil (0.7 mil in thickness) is glued to a stainless washer (ID: 0.651 00 , OD: 1 00 ) while being heated in an oven at a temperature DT ¼ 7 C above the room temperature. Inplane tension is generated as it cools down, after which the washers are glued to the 3D printed ...
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... difference between the thermal expansion coefficients of the diaphragm (aluminum) and the washer (steel) and E and are the Young's modulus and Poisson's ratio of aluminum, respectively. Finally, two single mode fibers (Corning SMF-28) are inserted into the ceramic ferrules to form two Fabry-Perot sensing interferometers for the LCFOI system. See Fig. 2(c) for a photo of the whole integrated ...
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... detect the center displacements, a two-channel LCFOI system [ Fig. 2(a) bottom] is adopted, which consists of a broadband superluminescent diode (SLD, Thorlabs S5FC1018S), three 1 Â 2 couplers, two photodetectors (Newport 2011), and two Fabry-Perot tunable filters (Micron Optics FFP-TF2) as the reference interferometers. Compared with the conventional laser-based interferometer, LCFOI has one particular ...
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