Fig. 5. The graph about the error and the measured temperature of the optical temperature sensor according to the applied temperature of temperature probe.
Fig. 1. (a) The construction of tunable wavelength optical temperature sensors using temperature dependence of VCSEL. (b) The structure of VCSEL package and the graph about the value of the internal temperature change of the VCSEL to tune the wavelength and the value of the measured power of the reflected light from the FBG.
Fig. 2. (a) The graph about the output wavelength according to internal application temperature of light source (applied temperature range: 14~52.2℃, output wavelength range: 1519.90~1524.25 nm). (b) Graph about output wavelength repeatability according to internal temperature of light source (output wavelength at 14℃ and 52.2℃: 1519.90 nm, 1524.25 nm, maximum repeatability error: ±0.003 nm).
Fig. 3. (a) The photograph of fabricated temperature probe. (b) The graph about the reflection wavelength of the temperature probe (temperature of the probe: 21.17℃, the center optical wavelength: 1520.93 nm, 3-dB bandwidth: 0.11 nm).
Fig. 4. (a) The graph about the measured temperature of the light source and the reflection wavelength of the probe according to the applied temperature of temperature probe (measurement temperature range: 22.3~194.2℃). (b) The graph about the measured value of internal temperature of the light source when the power of the reflected wavelength according to the applied temperature is the maximum value (The value of the reflected wavelength change of the temperature probe according to applied temperature ΔΤ: 16.64 pm/℃).
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