紅外光吸收光譜會反應出分子振動能階的躍遷，被視為分子的指紋，可被用來分析物質的分子組成，又因紅外光具有較高的視覺安全性及較低的破壞性，相當適合與日常生活的技術結合。為了克服紅外光陣列偵測器造價昂貴的限制，本計畫擬建立一以單像素偵測器(SPD)結合壓縮感測(CS)技術的紅外光超光譜影像系統(IR-HSI)，波長範圍為1100-2500 nm，利用散射介質光斑所具有的光譜去相關性來將光譜資訊以不同的光斑分布做展開，並利用光斑的線性位移不變特性來紀錄物體的空間資訊，點光源及物光經過散射介質產生的光斑將由CS技術來紀錄和重建，重建的光斑分布經由反摺積的演算法即可重建HSI。相較類似的系統，本系統只須以空間調制器進行調制圖像的掃描，而不需光譜的掃描，可在降低系統複雜度、提升系統穩定性及增加取像速率方面取得優勢。完成系統的建構後，將以遠距乙醇濃度量測為主題，將系統運用在皮膚漫反射IR-HSI的量測上，藉由乙醇的特徵吸收光譜，以皮膚的漫反射光譜分析血液中乙醇的濃度，並透過HSI的空間資訊探討乙醇代謝過程中在空間分布上的變化，目的是開發一套主動偵測人體乙醇濃度的裝置，希望藉此提升對酒駕的預防能力，並降低對酒駕者舉證和溯源的困難度，改善國人因酒駕產生的交通安全問題。 ;Infrared (IR) absorption spectrum can reveal the transitions between vibrational states and is known as the molecular fingerprint. Because IR light has higher eye safety and low photodamage, IR absorption spectroscopy is suitable to be combined with daily-life applications. To overcome the limitation of pricy IR array detector, in this proposal, an IR hyperspectral imaging system (IR-HSI) based on single-pixel detector (SPD) and compressive sensing (CS) technique will be built. The wavelength range of this system is 1100-2500 nm. The wavelength information is separated by different speckle distribution after a scattering media, based on the spectral decorrelation property of the scattering media. The spatial information is coded by the linear shift-invariant property of the speckle of the scattering media. The speckle patterns corresponding to both point-source and object will be recorded and reconstructed through CS technique. Performing deconvolution algorithm on the object’s speckle pattern, an IR HSI can be reconstructed. In contrast to other systems, this system requires only modulation pattern scanning of spatial light modulator but no spectral scanning. Therefore, this system has the advantages of lower complexity, higher stability and higher imaging rate. After the system is built, it will be applied to remote detection of ethanol concentration, achieved by measuring the skin IR diffuse reflection HSI. Since ethanol has several characteristic absorption bands within 1100-2500 nm, it is possible to analyze the ethanol concentration in blood through skin IR diffuse reflection spectrum. Using the spatial information provided by HSI, it is able to study the spatial distribution variation of ethanol during the metabolism process. This research aims to develop a device to detect the ethanol concentration without collecting breath and blood samples. This device can enhance the ability to prevent drunk driving and solve the safety issues resulted from drunk driving.
