[3] [3] XU Ai-bin. Problem of Internal Water vapor content in domestic sealed device[J]. Electronic Product Reliability and Environmental Testing, 2002(6): 29-31.

[6] [6] Liu K, Li J, Wang L, et al. Trace gas densor based on quartz tuning fork enhanced laser photo acoustic spectroscopy[J]．Applied Physics B: lasers and optics, 2009, 94(3): 527-533.

[9] [9] Jahjah M,Vicet A, Rouillard Y. A QEPAS based methane sensor with a 2.35 μm antimonide laser[J]. Applied Physics B: lasers and optics, 2012, 106(2): 483-489.

[10] [10] Lei D, Kosterev A A, Thomazy D, et al. QEPAS spectrophones: design, optimization and performance[M]. Applied Physics B: lasers and optics, 2010, 100(3): 627-635．