Temperature control system for laser heating: Application for minute asteroidal materials |
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| Affiliation: | 1. Neutron Imaging and Quantum Beam Analysis Group, Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai-mura, Ibaraki, Japan;2. Electric Field/Discharge Processes Group, Materials Processing Unit, National Institute for Materials Science, Tsukuba, Japan;3. Department of Earth and Planetary Sciences, Kyushu University, Higashi-ku, Fukuoka, Japan;4. Earthquake Research Institute, The University of Tokyo, Bunkyo-ku, Tokyo, Japan;5. Geochemical Research Center, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo, Japan;1. Dept. ELEC, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium;2. University of Gävle, Kungsbäcksvägen 47, 801 76 Gävle, Sweden;3. Dept. SURF, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium;1. WorleyParsons Canada, Edmonton Operations, Canada;2. Department of Mechanical Engineering, University of Alberta, Canada;1. Department of Electrical Engr., Inha University, Incheon, Republic of Korea;2. Department of Electrical Engr., Konkuk University, Seoul, Republic of Korea;1. SELECT, VIT University, Chennai Campus, Vandalur-kelambakam road, Chennai 600127, India;2. SMBS, VIT University, Chennai Campus, Vandalur-kelambakam road, Chennai 600127, India;3. Sri Subramanya College of Engineering and Technology, Palani 624615, India;1. Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043;2. Research Center of Nuclear Physics, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047;3. High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801;1. Institute of Clinical Physiology, National Council of Research, via G. Moruzzi 1, 56124 Pisa, Italy;2. Fondazione G. Monasterio CNR – Regione Toscana, via G. Moruzzi 1, 56124 Pisa, Italy;3. Department of Information Engineering, University of Pisa, via Diotisalvi 2, 56126 Pisa, Italy |
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| Abstract: | A temperature control system for a laser heating has been developed to extract noble gases from minute material samples recovered from the asteroid Itokawa by the Hayabusa spacecraft. An ultra-fine thermocouple was produced from 3% Re–W and 26% Re–W wires 25 μm in diameter, and its electromotive force was calibrated. A temperature control program was originally produced using LabVIEW 2011 in which proportional-integral-derivative (PID) control was not adopted as an algorithm of the program. Particle samples smaller than 60 μm in diameter were set in conical depressions in a sample holder made of fused silica and irradiated by a slightly defocused Nd-YAG laser. The temperature of the samples was recorded by the thermocouple that passed through a small hole 50 μm in diameter because the sample and the thermocouple always came into contact during laser heating. The program controlled the temperature of the tiny samples appropriately. The average temperature during heating was slightly lower than the setting temperature and the standard deviation and the maximum overshoot were lower than 2.5% and 6.0% of the setting temperature, respectively. The performance of the temperature control system is high enough to conduct the stepwise heating experiment for minute extraterrestrial material samples. |
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| Keywords: | Thermocouple Laser heating LabVIEW Asteroid Itokawa Hayabusa |
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