thermocouple Seebeck EffectThomas Seebeck 1821 When two wires

열전대(thermocouple)의 원리 • Seebeck Effect(Thomas Seebeck, 1821) When two wires composed of dissimilar metals are joined at both ends and one of the ends is heated, there is a continuous current which flows in thermoelectric circuit. Metal A + Metal A e. AB Metal B The Seebeck Effect -5 - - Metal B e. AB = Seebeck Voltage Smart Structures and Composites Laboratory

스트레인 게이지의 사양 Table 2. 1 Specifications of strain gauge for high temperature. Gauge length 5 mm Gauge factor (23°C, 50%RH) Temperature Compensation 2. 14 ± 1 % 11 10 -6/°C Table 2. 2 General characteristics of NP-50(strain gage adhesive). Components Hardening time -7 - Base : Polyester resin Hardening agent : Organic peroxide 2 hours at 25°C Pot life 3 min or less at a room temperature Mixing ratio(weight) Base : Hardening agent = 100 : 2~4 Operating temperature range after hardening -30 to +300 °C Smart Structures and Composites Laboratory

열전대 시스템 (K-type) Thermocouple connector BNC connector AD 595 Power supply Digital indicator -8 - Smart Structures and Composites Laboratory

열전대 시스템의 보정 실험 Clamped Measured data Linear fit Thermocouple system Standard Thermometer T(o. C)=100 V-7. 5 Digital multimeter Electric Heater Thermocouple(K-Type) After heating to 100°C -9 - Cooling temperature, measure voltage vs. temperature Smart Structures and Composites Laboratory

EFPI 센서 시스템 & FBG 센서 시스템 current source LED LD laser diode isolator power supply coupler detector Coupler OSA radiator photo detector isolator Current source data acquisition system sensor FC/APC <EFPI 센서 시스템> - 11 - <FBG 센서 시스템> Smart Structures and Composites Laboratory

FBG 온도 센서 & 온도 특성 실험 장치 Thermal chamber Epoxy adhesion (for high temperature) Grating Temp. FBG Thermocouple sensor system Thermocouple. FBG 2 2 coupler Heat Glass tube Optical fiber Epoxy adhesion (for high temperature) Current source Strain-free temperature sensor <FBG 온도센서> - 12 - LED Digital oscilloscope OSA <FBG 온도 특성 실험 장치> Smart Structures and Composites Laboratory

FBG 센서의 온도 특성 At 25°C At 100°C FBG 0. 75 nm FBG Temp. FBG 0. 75 nm FBG 센서, FBG 온도 센서 모두 1°C에 0. 01 nm의 파장이동을 보임 - 13 - Smart Structures and Composites Laboratory

Aluminum 열변형 실험 - 시편 형상 280 EFPI Thermocouple 12. 5 50 25 12. 5 25 FBG [Top] 10 6 Temp. FBG [Top] 50 12. 5 ESG [Bottom] EFPI [Bottom] Temp. FBG Thermocouple 6 6 ESG [Unit : mm] <EFPI 센서> - 14 - [Unit : mm] <FBG 센서> Smart Structures and Composites Laboratory

Aluminum 열변형 실험 - 실험 장치 Thermal chamber Thermocouple sensor system Clamp EFPI Thermocouple Titanium silicate Ref. ESG Heat Clamp Temp. FBG Titanium silicate Ref. ESG Fiber optic sensor system - EFPI sensor 2 2 coupler Heat Strain gauge system LED Digital oscilloscope PC GPIB <EFPI 센서> - 15 - Strain gauge system OSA Current source <FBG 센서> Smart Structures and Composites Laboratory

Aluminum 열변형 실험 - Raw signal Thermocouple EFPI ESG <EFPI 센서> - 16 - Temp. FBG ESG <FBG 센서> Smart Structures and Composites Laboratory

Aluminum 열변형 실험 - 열변형률 비교 Theory EFPI ESG Theory FBG ESG EFPI : 22. 91 / C ESG : 22. 42 / C CTE : 23 / C <EFPI 센서> - 17 - FBG : 22. 80 / C ESG : 22. 44 / C CTE : 23 / C <FBG 센서> Smart Structures and Composites Laboratory