Method for weakening ripple effects in folded cavity ring-down spectroscopy systems

Abstract

The invention discloses a method for weakening ripple effects in folded cavity ring-down spectroscopy systems, and belongs to the field of novel laser absorption spectroscopy technical research and application. The method is derived from mechanism analysis on the ripple effects in the folded cavity ring-down spectroscopy systems and is essentially used for preventing particulate pollution on the surfaces of folded high-reflectivity mirrors and increasing folded angles of folded cavities, so that interference effects of scattered fields which are formed by an inner folded optical resonance front light beam and an inner folded optical resonance reverse light beam on the surfaces of the high-reflectivity mirrors of the folded cavities can be weakened during cavity ring-down measurement, and the purpose of weakening the ripple effects can be achieved. The method has the advantages that the method is simple, is easy to implement and has an important significance in effectively improving the performance of the folded cavity ring-down spectroscopy systems and promoting application of the folded cavity ring-down spectroscopy systems.

Description

technical field [0001] The invention relates to a method for weakening the ripple effect in a folded cavity ring-down spectrum system, which belongs to the field of research and application of novel laser absorption spectrum technology. Background technique [0002] The emergence and development of spectroscopic technology has made outstanding contributions to human understanding and understanding of the material world. Since its inception, spectroscopic technology has continued to develop and grow. Especially in the 1960s, the emergence of laser technology made spectroscopic technology even more powerful, making it a powerful tool in the fields of analytical chemistry and physical chemistry. It has been widely used in qualitative and quantitative measurement. According to the way the spectrum is generated, spectroscopic techniques can generally be divided into absorption spectroscopy, emission spectroscopy, scattering spectroscopy, and fluorescence spectroscopy. No matter...

AI Technical Summary

Problems solved by technology

The occurrence of this situation is not only related to the relatively complex structure of the folded cavity ring-down spectrum system, high requirements for processing and adjustment precision of the folded cavity, but also related to a special physical phenomenon in the system—the ripple effect. The emergence of this phenomenon makes the data processing of the spectroscopic system complicated and the measurement sensitivity of the system is reduced [For details, please refer to: Tan Zhongqi, Wu Suyong, Liu Jianping, Yang Kaiyong, Long Xingwu. down spectroscopy[J].High Power Laser and Particle Beams,2014,26(10):26101006-]

The so-called ripple effect refers to the phenomenon that the folded cavity loss value measured by the folded cavity ring-down spectroscopy system has a sinusoidal periodic change with the scanning of the laser wavelength. The earliest reports on this ripple effect can be traced back to 1999, D .Romanini and others first observed this phenomenon in the experimental research of their optical feedback folded cavity ring-down spectroscopy system, but at that time they only regarded this phenomenon as a measurement noise and did not discuss it

Since 2004, J.Morville and others have mentioned this phenomenon again in the research of optical feedback cavity ring-down spectroscopy system, described it in more detail, and made a simple analysis of the cause of the effect, but did not Mention ways to attenuate the effect

In addition, no other units at home and abroad have conducted research on folded cavity ring-down spectroscopy and related technologies

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