臺灣博碩士論文加值系統

鑑於目前實驗室欲在常溫下使用邁克生式干涉光譜儀(Bruker IFS 66v/S)量測兆赫波頻段元件之穿透特性，並不容易。因此我們建立一套利用光學偏振特性分光的Martin-Puplett干涉光譜儀，使用金屬線柵作為分光元件，常溫操作的焦熱電偵測器與搭配汞燈作為光源，可在常壓與真空度一毫巴的環境下量測頻率介於0.6~2.1 Thz (20~70〖cm〗^(-1))的兆赫波段之頻譜。並且使用此光譜儀系統量測高密度聚乙烯與摻雜鐵的磷化銦穿透率頻譜，將結果與文獻比對，驗證此Martin-Puplett光譜儀之正確性。

At present, it is not easy for our laboratory to use a Michelson interferometer-based spectrometer (Bruker IFS 66v/S) to measure spectrum in the terahertz range at room temperature. We use the polarization properties of light to build a spectrometer utilizing Martin-Puplett interferometer. The spectrometer employs a wire grid polarizer for light splitting, a room temperature pyroelectric detector, and a mercury lamp as light source, allowing a measurable frequency range of 0.6 ~ 2.1 Thz (20~70〖cm〗^(-1)) in air and in vacuum.
Finally, we use the spectrometer to measure the transmission spectra of high density polyethylene and Fe-doped indium phosphidethe samples and compare the results with the literature to verify the performance.

目 錄
兆赫波Martin-Puplett干涉光譜儀架設之研究 I
A Study of Terahertz Spectrometer Based on Martin-Puplett Interferometer II
誌 謝 III
目 錄 IV
圖 目 錄 VI
一、 緒論 1
1-1 前言 1
1-2 研究背景與目的 2
二、原理與理論 5
2-1 傅立葉轉換紅外光譜儀(Fourier-transform infrared spectroscopy，FTIR) 5
2-1-1 邁克生干涉儀(Michelson interferometer) 5
2-1-2 傅立葉轉換(Fourier transform) 7
2-2 Martin-Puplett干涉儀 10
2-2-1屋頂鏡(Roof Mirror) 13
2-2-2金屬線柵(Wire Grid) 15
三、實驗架設與討論 16
3-1 氦氖雷射校正 16
3-2 黑體輻射定位 18
3-3 微波單頻輻射源驗證Martin-Puplett干涉儀 22
3-4 真空腔內汞燈搭配薄膜分光鏡之干涉 24
3-5 真空腔內微波單頻輻射源搭配金屬線柵測試 28
3-6 真空腔內Martin-Puplett干涉儀 31
3-6-1 比較聚乙烯偏振片與金屬線柵之Martin-Puplett干涉儀差異 33
3-6-2 重複量測確認Martin-Puplett干涉儀可穩定量測之頻譜範圍 34
3-6-3 驗證此Martin-Puplett光譜儀之正確性 37
3-7 頻譜量測問題討論 40
3-7-1 混疊 40
3-7-2 真空度 42
四、 結論與展望 45
參考文獻 48
附錄一、光譜儀軟體說明 49
附錄二、元件規格 55
簡歷 57

[1] D. K. Lambert, P. L. Richards, “Martin-Puplett interferometer: an analysis”, Applied Optics, Vol. 17, Issue 10, pp. 1595-1602, 1978.
[2] V. M. Da Costa and L. B. Coleman,“Theory of a Double Polariz”, Applied Spectroscopy, Vol. 44, Issue 8, pp. 1301-1308, 1990.
[3] AngelColin, “Improvements on calibration measurements with a Martin–Puplett interferometer”, Cryogenics, Volume 47, Issues 9–10, Pages 530-533, 2007.
[4] Evtushenko, Pavel E., Klopf, John M., “Measurements of Martin-Puplett Interferometer Limitations using Blackbody Source”, Thomas Jefferson National Accelerator Facility, Newport News, VA (United States), 2013.
[5] Herres, Werner, and Joern Gronholz, “Understanding FT-IR data processing.”,1984.
[6] MOK, C. L., et al, “The far-infrared performance and application of free-standing grids wound from 5 μm diameter tungsten wire.” Infrared Physics, Volume 19, Issues 3-4, Pages 437-442, 1979.
[7] http://www.tydexoptics.com/products/thz_optics/thz_materials/
[8] SUBRAMANIAM, Brinda; PERKOWITZ, S. “Low frequency multiphonon absorption in InP: Fe. Solid state communications”, 1985.
[9] CARLI, B.; MENCARAGLIA, F., “Signal doubling in the Martin-Puplett interferometer. ” International Journal of Infrared and Millimeter Waves, 1981.
[10] Bruker Corporation