Highly sensitive method of temperature sensing by using heterodyne detection

Eudum Kim; Sun-Ho Kim; Jun-Hee Park; Su-Jin Jeon; Ji-Hoon Kim; Mi Jung; Young-Wan Choi

doi:10.1117/12.2286836

14 February 2018 Highly sensitive method of temperature sensing by using heterodyne detection

Eudum Kim, Sun-Ho Kim, Jun-Hee Park, Su-Jin Jeon, Ji-Hoon Kim, Mi Jung, Young-Wan Choi

Proceedings Volume 10551, Optical Data Science: Trends Shaping the Future of Photonics; 105510N (2018) https://doi.org/10.1117/12.2286836
Event: SPIE OPTO, 2018, San Francisco, California, United States

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 10⁸ of Q factor. We varied temperature by 0.1 °C from 17.4 °C to 18.4 °C using TEC (temperature controller). We observed 0.01 nm/°C of wavelength change through OSA and 9.5 GHz/°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 9.5×10^-7 °C theoretically for the ESA resolution bandwidth of 1 kHz. This detecting ability can be applied to highly sensitive temperature sensor.

Citation Download Citation

Eudum Kim, Sun-Ho Kim, Jun-Hee Park, Su-Jin Jeon, Ji-Hoon Kim, Mi Jung, and Young-Wan Choi "Highly sensitive method of temperature sensing by using heterodyne detection", Proc. SPIE 10551, Optical Data Science: Trends Shaping the Future of Photonics, 105510N (14 February 2018); https://doi.org/10.1117/12.2286836

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