利用FBG(Fiber Bragg Grating) 來量測溫度與應力的感測器並不屬於近期新穎的
發明與突破，但在設備上可以有改良與簡化的空間。在本篇論文中，我們提出兩
樣與一般光纖光柵感測器不同的突破:
1. 利用光功率計(Powermeter) 取代光頻譜分析儀(OSA, Optical Spectrum Analysis)
2. 利用一個FBG(Fiber Bragg Grating) 可同時對兩個變數(溫度與應變) 作偵測

一般來說，FBG 的感測接收訊號端為光頻譜分析儀(OSA, Optical Spectrum
Analysis)，可準確的量測到波長、頻寬、波形、能量等資訊，但OSA 畢竟攜帶
不便，成本也較昂貴，在這篇論文中，我們利用幾樣身邊簡單取得的器具並以光
功率計(Powermeter) 來取代OSA，使用上更便利與簡潔，以感測器的角度來說，
成本降低意味著離普及化又更進一步。
另一方面，能夠只用一個FBG 量測到兩個變數，歸功於特殊的光路設計巧思，
在這裡我們利用了三個光功率計、兩個光耦合器、一個光循環器、一個帶通濾波
器(Band-pass filter)、一個FBG 與一個寬頻光源，來達成同時量測兩個變數的目
的。在本論文實際架構上，我們構思出利用梯形彈簧鋼片，造成受力時各處曲率不同，而在各處產生不同應變，便可以簡單產生chirp grating的方法。

的。

Using FBG (Fiber Bragg Grating) sensors to measure temperature and strain is
not a recent novel technique and breakthrough. But the measurements with FBGs
as sensors can be improved and simplified. In this paper, we propose two different
breakthroughs as to the general fiber grating sensors: 1. Using optical power meters
to replace optical spectrum analyzers. 2. Using fiber Bragg grating to measure strain
and temperature simultaneously. In general, the FBG receiving end is an optical
spectrum analyzer (OSA, optical spectrum analyzer). It can measure wavelength,
bandwidth, waveform, power..., and etc. But OSA is inconvenient and expensive. In
this paper, we use a simple measurement scheme with optical power meters used to
measure strain and temperature simultaneously. On the other hand, thanks to the
special optical system design, it is realizable to measure the strain and temperature
with only one FBG. In this paper, a trapezoid-shaped steel sheet is used to induce
different curvature radii at different positions upon being stressed at a particular
point. The FBG with a uniform grating period attached on this sheet then became
a chirped grating when the sheet was stressed.

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