Highly sensitive method of temperature sensing by using heterodyne detection
- Authors
- Kim, Eudum; Kim, Sun-Ho; Park, Jun-Hee; Jeon, Su-Jin; Kim, Ji-Hoon; Jung, Mi; Choi, Young-Wan
- Issue Date
- Jun-2018
- Publisher
- SPIE-INT SOC OPTICAL ENGINEERING
- Keywords
- Heterodyne detection; optical beating; temperature sensing
- Citation
- OPTICAL DATA SCIENCE: TRENDS SHAPING THE FUTURE OF PHOTONICS, v.10551
- Journal Title
- OPTICAL DATA SCIENCE: TRENDS SHAPING THE FUTURE OF PHOTONICS
- Volume
- 10551
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/56189
- DOI
- 10.1117/12.2286836
- ISSN
- 0277-786X
1996-756X
- Abstract
- In this paper, we propose temperature sensing method by using optical beating. When temperature changes, a peak wavelength of the sensing laser varies slightly. However, with limitation of the optical spectrum analyzer's (OSA) spectral resolution (sub-nm), it is hard to measure the exact quantity of the wavelength variation. Therefore, we used electrical spectrum analyzer (ESA) and two lasers to obtain the wavelength shift. We used DFB-LD (distributed feedback laser diode) and TLS (tunable laser source) to get beating signal. Each of laser has 1550 nm of wavelength, -20 dBm of intensity and 10(8) of Q factor. We varied temperature by 0.1 degrees C from 17.4 degrees C to 18.4 degrees C using TEC (temperature controller). We observed 0.01 nmPC of wavelength change through OSA and 9.5 GHz/degrees C of beating frequency change through ESA. With this result, we verified that we can measure relative temperature change with having ultra-fine resolution of 9.5x10(-7) degrees C theoretically for the ESA resolution bandwidth of 1 kHz. This detecting ability can be applied to highly sensitive temperature sensor.
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Collections - College of ICT Engineering > School of Electrical and Electronics Engineering > 1. Journal Articles
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