本研究利用氣體稜鏡技術即時檢測氣體折射率，利用光學稜鏡與待測氣體產生不同偏折角，再搭配Shack-Hartmann波前檢測架構，可換算出實際波前傾斜角度變化量，進一步推算出該氣體折射率。相比於一般量測稜鏡偏轉角之氣體折射率量測系統，藉由Shack-Hartmann波前檢測儀之微透鏡陣列，可以使取樣更多且更精確地取得偏轉角及氣體折射率。

In this research, we present a new system for real-time inspection of gas refractive-index. The system combines with an optical prism to measure the refraction by the deviation angle. A Shack-Hartmann wavefront sensor is also used in this system to analyze the wavefront change resulting from the different refractive indexes of gas. In this system, we use a plane wave as a light source to collaborate with the wavefront sensor. Also, the system applies a single-light-path design which is easier for adjustment or calibrations.