摘要The Raman signal of gas molecules is very weak due to its small scattering cross section. Here, a near-confocal cavity-enhanced Raman detection system is demonstrated. In the cavity, a high power light of 9W is achieved by using a cw 200mW 532nm laser, which greatly enhances the detection sensitivity of gas species. A photomultiplier tube connected to a spectrometer is used as the detection system. The Raman spectra of the mixed gases separated from transformer oil has been observed. The relationship of absolute Raman intensity and gas pressure is also obtained. To our knowledge, this is the first Raman system to detect the gases separated from transformer oil.
Abstract：The Raman signal of gas molecules is very weak due to its small scattering cross section. Here, a near-confocal cavity-enhanced Raman detection system is demonstrated. In the cavity, a high power light of 9W is achieved by using a cw 200mW 532nm laser, which greatly enhances the detection sensitivity of gas species. A photomultiplier tube connected to a spectrometer is used as the detection system. The Raman spectra of the mixed gases separated from transformer oil has been observed. The relationship of absolute Raman intensity and gas pressure is also obtained. To our knowledge, this is the first Raman system to detect the gases separated from transformer oil.
[1] Triki M, Cermak P, M'ejean G and Romanini D 2008 Appl. Phys. B 91 195 [2] Thorpe M J, Hudson D D, Moll K D, Lasri J and Ye J 2007 Opt. Lett. 32 307 [3] Dong L, Yin W B, Ma W G, Zhang L and Jia S T 2007 Sensors Actuators B 127 350 [4] Thang K F, Aggarwal R K, McGrail A J and Esp D G 2003 IEEE Trans. Power Delivery 18 1241 [5] Jalbert J and Gilbert R 1997 IEEE Trans.Power Delivery 12 754 [6] Hideo Tai, Kazushige Yamamoto and Masahiko Uchida 1992 IEEE Photon. Technol. Lett. 4 804 [7] Kumar P C and Wehrmeyer J A 1997 Appl. Spectrosc. 51 849 [8] Carlisle C B and Cooper D E 1990 Appl. Phys. Lett. 56 805 [9] Diller D E and Chang R F 1980 Appl. Spectrosc. 34 411 [10] Hargis P J Jr 1981 Appl. Opt. 20 149 [11] Adler-Golden S M, Goldstein N, Bien F, Matthew M W, GershM E, Cheng W K and Adams F W 1992 Appl. Opt. 31 831 [12] Mank A J G, Belfadhel-Ayeb A, Krsemann P V E and Notten PH L 2005 Appl. Spectrosc. 59 109 [13] Brunsgaard Hansen S, Berg R W and Stenby E H 2001 Appl. Spectrosc. 55 55
2008, Vol. 25 
