Journal: Sensors (Basel, Switzerland)

Article Title: Sensitivity-Enhanced Extrinsic Fabry–Perot Interferometric Fiber-Optic Microcavity Strain Sensor

doi: 10.3390/s19194097

Figure Lengend Snippet: Structure of the extrinsic Fabry–Perot interferometric (EFPI) microcavity fiber-optic strain sensor. The sensor is composed of two vertically cut single mode fibers with a short facet separation in the level of micrometers and a centimeters-long glass capillary. ( a ) Schematic of the sensor, ( b ) microscopic photograph of the microcavity. In which, L μ and L C are the microcavity length and the capillary length, respectively.

Article Snippet: For the fabrication of the EFPI microcavity fiber-optic strain sensor, standard SMFs (model G652D, Corning Inc., Corning, NY, USA) were used with core and cladding diameters of 9 μm and 125 μm, respectively.

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Sensitivity-Enhanced Extrinsic Fabry–Perot Interferometric Fiber-Optic Microcavity Strain Sensor

doi: 10.3390/s19194097

Figure Lengend Snippet: Schematic of a strain sensing system based on the EFPI microcavity strain sensor (SLD: superluminescent diode, OSA: optical spectrum analyzer). The SLD is used as a wideband illuminating source. The OSA is used to extract the reflection spectrum. Two capillary ends of the EFPI microcavity strain sensor are fixed on a pair of translation stages for strain imposing test.

Article Snippet: For the fabrication of the EFPI microcavity fiber-optic strain sensor, standard SMFs (model G652D, Corning Inc., Corning, NY, USA) were used with core and cladding diameters of 9 μm and 125 μm, respectively.

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Sensitivity-Enhanced Extrinsic Fabry–Perot Interferometric Fiber-Optic Microcavity Strain Sensor

doi: 10.3390/s19194097

Figure Lengend Snippet: ( a ) Spectrum of a SLD with a center wavelength of 1568 nm and a 3 dB bandwidth of 98 nm, which has a Gaussian-like spectral distribution. ( b ) Reflection spectrum of an EFPI microcavity fiber-optic strain sensor, which exhibit several peaks can be used to determine the cavity length.

Article Snippet: For the fabrication of the EFPI microcavity fiber-optic strain sensor, standard SMFs (model G652D, Corning Inc., Corning, NY, USA) were used with core and cladding diameters of 9 μm and 125 μm, respectively.

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Sensitivity-Enhanced Extrinsic Fabry–Perot Interferometric Fiber-Optic Microcavity Strain Sensor

doi: 10.3390/s19194097

Figure Lengend Snippet: Photograph of the experimental system with the EFPI microcavity fiber-optic strain sensor. Two capillary ends of the sensor were fixed on the pair of translation stages through 502 glue. Axial direction moving of the translation stages is used to impose strain on the glass capillary of the sensor.

Article Snippet: For the fabrication of the EFPI microcavity fiber-optic strain sensor, standard SMFs (model G652D, Corning Inc., Corning, NY, USA) were used with core and cladding diameters of 9 μm and 125 μm, respectively.

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Sensitivity-Enhanced Extrinsic Fabry–Perot Interferometric Fiber-Optic Microcavity Strain Sensor

doi: 10.3390/s19194097

Figure Lengend Snippet: Spectral shift upon application of a longitudinal strain to a short cavity EFPI strain sensor with a microcavity length 20 µm of and a capillary length of 40 mm. The three reflection spectra were gotten under different strains of 0, 157.425, and 261.725 με, respectively. With the increasing of the strain imposed, more reflection peaks appeared in the spectra for the increasing of cavity length.

Article Snippet: For the fabrication of the EFPI microcavity fiber-optic strain sensor, standard SMFs (model G652D, Corning Inc., Corning, NY, USA) were used with core and cladding diameters of 9 μm and 125 μm, respectively.

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Sensitivity-Enhanced Extrinsic Fabry–Perot Interferometric Fiber-Optic Microcavity Strain Sensor

doi: 10.3390/s19194097

Figure Lengend Snippet: Relationships between the cavity length and the strain for three EFPI microcavity fiber-optic strain sensors with the same capillary lengths of 40 mm but different initial cavity lengths (20 μm, 30 μm, and 40 μm). The cavity length–strain sensitivity was ~40.459 nm/με, regardless of the initial cavity length. Micrographs of the EFPI microcavity fiber-optic strain sensor with the initial cavity length of 30 μm under four different strains of 0, 1000, 2000 and 3000 με are also given as insets.

Article Snippet: For the fabrication of the EFPI microcavity fiber-optic strain sensor, standard SMFs (model G652D, Corning Inc., Corning, NY, USA) were used with core and cladding diameters of 9 μm and 125 μm, respectively.

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Sensitivity-Enhanced Extrinsic Fabry–Perot Interferometric Fiber-Optic Microcavity Strain Sensor

doi: 10.3390/s19194097

Figure Lengend Snippet: Relationships between the cavity length and the strain for three EFPI microcavity fiber-optic strain sensors with the same initial cavity length of 20 μm, but different capillary lengths (15 mm, 25 mm, and 40 mm). The cavity length–strain sensitivities of the three sensors were 15.928 nm/με, 25.281 nm/με, and 40.178 nm/με, respectively. Evidently, the sensitivity is directly proportional to the capillary length, and can be greatly enhanced by the capillary length.

Article Snippet: For the fabrication of the EFPI microcavity fiber-optic strain sensor, standard SMFs (model G652D, Corning Inc., Corning, NY, USA) were used with core and cladding diameters of 9 μm and 125 μm, respectively.

Techniques:

Journal: Sensors (Basel, Switzerland)

Article Title: Sensitivity-Enhanced Extrinsic Fabry–Perot Interferometric Fiber-Optic Microcavity Strain Sensor

doi: 10.3390/s19194097

Figure Lengend Snippet: Relationship between the cavity length and the temperature for an EPPI microcavity fiber-optic strain sensor with a capillary length of 40 mm and an initial cavity length of 25 μm. The cavity length increased as a function of temperature, and the cavity length–temperature sensitivity was ~0.612 nm/°C.

Article Snippet: For the fabrication of the EFPI microcavity fiber-optic strain sensor, standard SMFs (model G652D, Corning Inc., Corning, NY, USA) were used with core and cladding diameters of 9 μm and 125 μm, respectively.

Techniques: