@article{SisLab3182,
           title = {Ph{\^a}n t{\'i}ch n?ng {\dj}? kh{\'i} CO2 v?i c?u h{\`i}nh c{\h a}m bi?n h?p th{\d u} h?ng ngo{\d a}i kh{\^o}ng t{\'a}n s?c (NDIR) s? d{\d u}ng bi?n {\dj}?i fourier nhanh (FFT)},
          author = {Truong Giang Nguyen and Xuan Tuyen Nguyen and Ngoc Khai Nguyen and Dinh Tuan Pham and Hong Thai Giang},
            year = {2018},
           pages = {43--48},
         journal = {T{\d a}p ch{\'i} Khoa h{\d o}c Giao th{\^o}ng v?n t{\h a}i},
             url = {https://eprints.uet.vnu.edu.vn/eprints/id/eprint/3182/},
        abstract = {Trong c{\^o}ng tr{\`i}nh n{\`a}y, c?u tr{\'u}c c{\h a}m bi?n kh{\'i} CO2 d?a tr{\^e}n nguy{\^e}n t?c h?p th{\d u} h?ng ngo{\d a}i theo c?u h{\`i}nh kh{\^o}ng t{\'a}n s?c (NDIR) {\dj}??c thi?t k? v{\`a} ch? t{\d a}o. ? {\dj}{\'o}, c?u h{\`i}nh c{\h a}m bi?n g?m m?t ngu?n ph{\'a}t h?ng ngo{\d a}i s? d{\d u}ng {\dj}{\`e}n s?i {\dj}?t v{\`a} {\dj}?u thu h?ng ngo{\d a}i d{\d a}ng pin nhi?t {\dj}i?n v?i hai k{\^e}nh c{\'o} t{\'i}ch h?p k{\'i}nh l{\d o}c b??c s{\'o}ng h?ng ngo{\d a}i t{\d a}i 4,279um v{\`a} 3,91um. {\DJ}i?n {\'a}p {\dj}i?u khi?n (UIR-Lamp) {\dj}{\`e}n ph{\'a}t h?ng ngo{\d a}i l{\`a} d{\d a}ng xung vu{\^o}ng v?i m?c th?p 0 V v{\`a} m?c cao l{\`a} 5 V t{\d a}i t?n s? 0,1 Hz. T{\'i}n hi?u {\dj}i?n {\'a}p t? hai k{\^e}nh thu h?ng ngo{\d a}i {\dj}??c khu?ch {\dj}{\d a}i 10000 l?n cho gi{\'a} tr{\d i} t??ng ?ng U1 c{\h u}a k{\^e}nh nh{\d a}y kh{\'i} v{\`a} U2 l{\`a} c{\h u}a k{\^e}nh so s{\'a}nh. C{\'a}c b? s? li?u v? U1 v{\`a} U2 {\dj}??c ghi nh?n v{\`a} bi?n {\dj}?i Fourier nhanh (FFT) b?ng ph?n m?m {\dj}? l{\d o}c l?a {\dj}??c t{\'i}n hi?u l?i ra ph{\`u} h?p t?n s? c{\h u}a {\dj}{\`e}n ph{\'a}t v{\`a} lo{\d a}i b{\h o} {\dj}??c nhi?u t{\d a}p. C{\'a}c gi{\'a} tr{\d i} {\dj}i?n {\'a}p U1 v{\`a} U2 c{\h u}a c{\h a}m bi?n n{\`a}y {\dj}??c kh{\h a}o s{\'a}t trong d{\h a}i n?ng {\dj}? kh{\'i} CO2 0-100\% th? t{\'i}ch. {\DJ}?c tr?ng chu?n h{\'o}a t{\'i}n hi?u ln(U1/U2) cho th?y ph{\d u} thu?c tuy?n t{\'i}nh v{\`a}o n?ng {\dj}? kh{\'i} CO2.}
}