The atmospheric turbulence has a strong influence on laser transmission in the atmosphere. As a important parameter, atmospheric coherence length measures the atmospheric turbulence and it is very significant to determine the atmospheric conditions. This system puts into use visible wavelength is 532 nm ~ 680 nm , the charge coupled device size is 12.7 mm . The three component mechanically compensating zoom detecting system is designed, it has simple structure, low cost and real-time monitoring.
The tunable diode laser absorption spectroscopy combined with the long absorption path technique is a
significant method to detect harmful gas. The long optical path could come true by Herriott cell reducing the size of the
spectrometers. A 15 cm long Herriott cell with 28.8 m optical absorption path after 96 times reflection was designed that
enhanced detection sensitivity of absorption spectroscopy. According to the theory data of calculation, Herriott cell is
analyzed and simulated by softwares Matlab and Lighttools.
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