ﺳﺎﻣﺎﻧﻪ ﮐﻨﺘﺮل دﻣﺎي ﻓﻠﺰات ﺑﺎ اﺳﺘﻔﺎده از ﺟﺎﺑﺠﺎﯾﯽ ﺑﺎزﺗﺎب ﻧﻮر ﻟﯿﺰ

A Metal Temperature Control System using Laser Reflection Shift

در اﯾﻦ ﻣﻘﺎﻟﻪ ﺑﺎ اﺳﺘﻔﺎده از ﺗﻠﻔﯿﻖ ﻣﺪل درود و ﺿﺮاﺋﺐ ﻓﺮﻧﻞ ﺑﻪ ﺑﺮرﺳﯽ اﺛﺮ دﻣﺎ در ﺟﺎﺑﺠﺎﯾﯽ ﺑﺎزﺗﺎب ﻧﻮر ﻟﯿﺰر ﺑﺎ ﻗﻄﺒﺶ ﺧﻄﯽ دﻟﺨﻮاه از ﺳﻄﺢ ﯾﮏ ﻓﻠﺰ ﭘﺮداﺧﺘﻪ و اﯾﺪهاي ﺳﺎده ﺑﺮاي ﭘﺎﯾﺶ دﻣﺎي ﻓﻠﺰات ﺑﺎ اﺳﺘﻔﺎده از ﻟﯿﺰر اراﺋﻪ ﻣﯽﮐﻨﯿﻢ. ﺑﺎ ﻣﺤﺎﺳﺒﻪ ﺟﺎﺑﺠﺎﯾﯽﻫﺎي ﮔﻮس- ﻫﺎﻧﺨﻦ (GH) و اﯾﻤﺒﺮت-ﻓﺪوروف (IF) ﻧﺸﺎن داده ﻣﯽﺷﻮد ﮐﻪ ﭘﺮﺗﻮ ﻧﻮر ﺑﺴﺘﻪ ﺑﻪ ﺣﺎﻟﺖ ﻗﻄﺒﺶ آن ﻣﯽﺗﻮاﻧﺪ در ﻫﺮ دو ﺟﺎﺑﺠﺎﯾﯽ ﻣﮑﺎﻧﯽ و زاوﯾﻪاي ﻧﻘﺶ داﺷﺘﻪ ﺑﺎﺷﺪ. ﺑﺮ ﻃﺒﻖ ﺗﺤﻠﯿﻞ ﻧﻈﺮي، ﺗﺎﺑﺶ ﻣﻮج TM ﺑﺎ زاوﯾﻪ 89 درﺟﻪ ﺑﺮ ﺳﻄﺢ ﻃﻠﺎ ﺑﯿﺸﺘﺮﯾﻦ ﺣﺴﺎﺳﯿﺖ ﺟﺎﺑﺠﺎﯾﯽ ﻧﺴﺒﺖ ﺑﻪ ﺗﻐﯿﯿﺮات دﻣﺎ را داﺷﺘﻪ و ﺑﺎ ﮔﺮم ﺷﺪن ﻓﻠﺰ ﺑﻪ ﻃﻮر ﺧﻄﯽ ﮐﺎﻫﺶ ﻣﯽﯾﺎﺑﺪ. ﺗﻐﯿﯿﺮات ﺟﺎﺑﺠﺎﯾﯽ GH در ﺣﺪود pm 80 ﺑﺮ ﮐﻠﻮﯾﻦ اﺳﺖ. از ﻃﺮف دﯾﮕﺮ، اﻧﺤﺮاف IF ﺑﻪ ﻃﻮر ﯾﮑﻨﻮاﺧﺖ ﺑﺎ اﻓﺰاﯾﺶ دﻣﺎ اﻓﺰاﯾﺶ ﯾﺎﻓﺘﻪ و ﺑﻪ ازاء ﻫﺮ درﺟﻪ ﮐﻠﻮﯾﻦ، ﺟﺎﺑﺠﺎﯾﯽ ﻣﮑﺎﻧﯽاي در ﺣﺪود pm 3 اﯾﺠﺎد ﻣﯽﮐﻨﺪ. اﯾﻦ روش ﻣﯽﺗﻮاﻧﺪ در ﺳﺎﻣﺎﻧﻪﻫﺎي ﻫﺸﺪاردﻫﻨﺪه ﺑﺮاي ﺟﻠﻮﮔﯿﺮي از وﻗﻮع اﻧﻔﺠﺎر در ﻣﺎﺷﯿﻦ آﻟﺎت ﺻﻨﻌﺘﯽ ﻣﻮرد اﺳﺘﻔﺎده ﻗﺮار ﮔﯿﺮد.

using a combination of Drude model and Fresnel coefficients, we investigate the effect of temperature on laser beam shifts from metals and present a simple method for thermometry. A comprehensive analysis of both Goos-Hanchen (GH) and Imbert-Fedorov (IF) reflection shifts of an arbitrary oblique linearly polarized light from a plane metallic surface as a function of temperature is carried out. It is shown that the beam light can contribute both spatial and angular shifts depending on its state of polarity. The investigation indicates that the TM-wave radiation at 89° on gold surface produces the most sensitive GH shift with respect to the temperature and decreases as the metal is heated. The linear change of the spatial GH shift is about 80 pm per Kelvin. The IF deviations, on the other hand, have a monotonic ascending behavior which is about 3pm per Kelvin for the spatial shift. This method may serve as part of an alarm system to detect superheated explosive machinery.