Hollow Fiber Coupler Sensor
We present a bi-conical optical directional coupler composed of solid and hollow core fibers. Through an evanescent wave coupling mechanism, the detection of liquid refractive index and its temperature are demonstrated. The experimental results illustrated that the sensor offers a sensitivity of <...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2019-02-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/19/4/806 |
| Summary: | We present a bi-conical optical directional coupler composed of solid and hollow core fibers. Through an evanescent wave coupling mechanism, the detection of liquid refractive index and its temperature are demonstrated. The experimental results illustrated that the sensor offers a sensitivity of <inline-formula> <math display="inline"> <semantics> <mrow> <mn>4.03</mn> <mo>±</mo> <mn>0.50</mn> </mrow> </semantics> </math> </inline-formula> volts per refractive index units (V/RIU) for refractive indices ranging from <inline-formula> <math display="inline"> <semantics> <mrow> <mn>1.331</mn> <mo>±</mo> <mn>0.003</mn> </mrow> </semantics> </math> </inline-formula> to <inline-formula> <math display="inline"> <semantics> <mrow> <mn>1.403</mn> <mo>±</mo> <mn>0.003</mn> </mrow> </semantics> </math> </inline-formula> with a resolution of <inline-formula> <math display="inline"> <semantics> <mrow> <mn>3.5</mn> <mo>×</mo> <msup> <mn>10</mn> <mrow> <mo>−</mo> <mn>3</mn> </mrow> </msup> </mrow> </semantics> </math> </inline-formula> refractive index units (RIU). |
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| ISSN: | 1424-8220 |