In recent years, with the development of ultra-smooth surface polishing technology and extremely low-loss coating technology, the reflectivity of high-reflectivity mirror has become higher and higher, and the loss has become lower and lower. The high-reflectivity mirrors with total loss below 10-5 Even 10-6 have been commercialized. At the same time, measurement methods for the loss of high-reflectivity mirrors are constantly evolving. This article summarizes the loss measurement methods for high-reflectivity mirrors and the latest research progress at home and abroad, gives the principle of mainstream methods for high-reflectivity mirrors loss measurement, and introduces the measurement method for total loss and the various individual loss which make up it, including scatter, absorption and transmissions loss. What’s more, corresponding advantages and disadvantages are summarized.
KEYWORDS: Signal attenuation, Signal processing, Signal detection, Time metrology, Data acquisition, Computing systems, Fourier transforms, Signal to noise ratio, Thin films, Spectroscopy
As a parameter of the process of an event, the measurement of decay time constant has been widely used in many fields such as electronic information, economy, chemistry and biology. How to quickly and accurately obtain the decay time constant of various kinds of decay signals has always been a hot issue in the field of testing technology. In this paper, research and carding are carried out on the fast and accurate decay acquisition method of time constant of single exponential decay signal. The main purpose is to comprehensively grasp the main methods adopted in current engineering technology and scientific research, and on this basis, a set of fast and accurate acquisition scheme of attenuation time constant based on ZYNQ system is proposed, It lays a foundation for the development of cavity ring down loss measurement and spectrum measurement system.
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