Abstract
A novel method for real-time and inline wetness measurement based on surface plasmon resonance (SPR) is presented in this paper. The Kretschmann geometry is adopted to excite surface plasmon waves in our measurement system. In order to prevent water coating, an ultrathin layer of hydrophobic coating is formed on the surface of Au layer. The experimental results show that the level of steam wetness can be obtained via the area ratio of water and air on the prism, which is determined by analyzing the SPR spectrum of wet steam based on a Gaussian model. In addition, during the online measurement of flowing wet steam wetness, significant shifts in the resonant position of the SPR spectrum occurred, which can be attributed to the strong interaction of the adjacent water droplets.
Highlights
Interest in wet steam research was sparked by the need for efficient steam turbines used in power generation
We first focus on the case where part of the top surface area of a rectangular prism is immersed in water
According to our calculation, under an identical injection angle, surface plasmon resonance (SPR) excited from air-Au interface occurs at a much shorter wavelength that is beyond the scope of our spectrometer; the dips observed in Figure 2b are mainly from the Au-water interface
Summary
Interest in wet steam research was sparked by the need for efficient steam turbines used in power generation. Primarily based on light scattering techniques and microwave resonant cavities, has a high measuring precision, with the estimation of steam quality strongly depending on the droplet size classification [3,4,5]. Electrostatic charge and capacitance methods are new with rare studies on electrostatic charge of droplets in wet steam flow in low-pressure steam turbines [6,7,8]. Tracer determination method is popular in nuclear power plants, but there are several adverse aspects such as complicated operating process, intricate data processing, and costly instruments [9,10]. Up to now, online measurement of wetness in steam turbines as accessibility is still a major challenge
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