Fiber-Optic Temperature Sensor Using Cholesteric Liquid Crystals on the Optical Fiber Ferrules
Cholesteric liquid crystals (CLCs) can be applied to various physical and chemical sensors because their alignment structures are changed by external stimuli. Here, we propose a CLC device fabricated by vertically forming the helical axis of the CLC between the cross-sections of two optical fiber fe...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-08-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/15/5752 |
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| author | Soyeon Ahn Gi Hyen Lee Jun-Yong Lee Youngseo Kim Min Su Kim Srinivas Pagidi Byeong Kwon Choi Ji Su Kim Jong-Hyun Kim Min Yong Jeon |
| author_facet | Soyeon Ahn Gi Hyen Lee Jun-Yong Lee Youngseo Kim Min Su Kim Srinivas Pagidi Byeong Kwon Choi Ji Su Kim Jong-Hyun Kim Min Yong Jeon |
| author_sort | Soyeon Ahn |
| collection | DOAJ |
| description | Cholesteric liquid crystals (CLCs) can be applied to various physical and chemical sensors because their alignment structures are changed by external stimuli. Here, we propose a CLC device fabricated by vertically forming the helical axis of the CLC between the cross-sections of two optical fiber ferrules. An optical fiber temperature sensor was successfully implemented using the proposed optical fiber ferrule-based CLC device. A wideband wavelength-swept laser with a center wavelength of 1073 nm and scanning range of 220 nm was used as a light source to measure the variations in the reflection spectrum band according to the temperature change in the CLC cell. The wavelength variation of the reflection spectrum band according to the temperature applied to the CLC cell was reversible and changed linearly with a change in the temperature, and the long-wavelength edge variation rate according to the temperature change was −5.0 nm/°C. Additionally, as the temperature applied to the CLC cell increased, the reflection spectrum bandwidth gradually decreased; the reflection spectrum bandwidth varied at a rate of −1.89 nm/°C. The variations in the refractive indices with temperature were calculated from the band wavelengths of the reflection spectrum. The pitch at each temperature was calculated based on the refractive indices and it gradually decreased as the temperature increased. |
| first_indexed | 2024-03-09T04:59:31Z |
| format | Article |
| id | doaj.art-d22a243fff6e4f92be5989d34596b326 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-09T04:59:31Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-d22a243fff6e4f92be5989d34596b3262023-12-03T13:01:32ZengMDPI AGSensors1424-82202022-08-012215575210.3390/s22155752Fiber-Optic Temperature Sensor Using Cholesteric Liquid Crystals on the Optical Fiber FerrulesSoyeon Ahn0Gi Hyen Lee1Jun-Yong Lee2Youngseo Kim3Min Su Kim4Srinivas Pagidi5Byeong Kwon Choi6Ji Su Kim7Jong-Hyun Kim8Min Yong Jeon9Department of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaDepartment of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaDepartment of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaDepartment of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaDepartment of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaInstitute of Quantum Systems (IQS), Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaDepartment of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaDepartment of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaDepartment of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaDepartment of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, KoreaCholesteric liquid crystals (CLCs) can be applied to various physical and chemical sensors because their alignment structures are changed by external stimuli. Here, we propose a CLC device fabricated by vertically forming the helical axis of the CLC between the cross-sections of two optical fiber ferrules. An optical fiber temperature sensor was successfully implemented using the proposed optical fiber ferrule-based CLC device. A wideband wavelength-swept laser with a center wavelength of 1073 nm and scanning range of 220 nm was used as a light source to measure the variations in the reflection spectrum band according to the temperature change in the CLC cell. The wavelength variation of the reflection spectrum band according to the temperature applied to the CLC cell was reversible and changed linearly with a change in the temperature, and the long-wavelength edge variation rate according to the temperature change was −5.0 nm/°C. Additionally, as the temperature applied to the CLC cell increased, the reflection spectrum bandwidth gradually decreased; the reflection spectrum bandwidth varied at a rate of −1.89 nm/°C. The variations in the refractive indices with temperature were calculated from the band wavelengths of the reflection spectrum. The pitch at each temperature was calculated based on the refractive indices and it gradually decreased as the temperature increased.https://www.mdpi.com/1424-8220/22/15/5752fiber-optic sensorstemperature sensorsfiber laserwavelength-swept lasercholesteric liquid crystalbandpass filter |
| spellingShingle | Soyeon Ahn Gi Hyen Lee Jun-Yong Lee Youngseo Kim Min Su Kim Srinivas Pagidi Byeong Kwon Choi Ji Su Kim Jong-Hyun Kim Min Yong Jeon Fiber-Optic Temperature Sensor Using Cholesteric Liquid Crystals on the Optical Fiber Ferrules Sensors fiber-optic sensors temperature sensors fiber laser wavelength-swept laser cholesteric liquid crystal bandpass filter |
| title | Fiber-Optic Temperature Sensor Using Cholesteric Liquid Crystals on the Optical Fiber Ferrules |
| title_full | Fiber-Optic Temperature Sensor Using Cholesteric Liquid Crystals on the Optical Fiber Ferrules |
| title_fullStr | Fiber-Optic Temperature Sensor Using Cholesteric Liquid Crystals on the Optical Fiber Ferrules |
| title_full_unstemmed | Fiber-Optic Temperature Sensor Using Cholesteric Liquid Crystals on the Optical Fiber Ferrules |
| title_short | Fiber-Optic Temperature Sensor Using Cholesteric Liquid Crystals on the Optical Fiber Ferrules |
| title_sort | fiber optic temperature sensor using cholesteric liquid crystals on the optical fiber ferrules |
| topic | fiber-optic sensors temperature sensors fiber laser wavelength-swept laser cholesteric liquid crystal bandpass filter |
| url | https://www.mdpi.com/1424-8220/22/15/5752 |
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