Abstract: Today little is known about the behavior of particles in solid-gas two-phase flow due to the lack of suitable measuring methods. In this paper, a new equipment based on optical fiber sensor technology is developed to measure the particle velocity and concentration. The measured results in a gas fluidized bed of 50 cm in four sides and 4.2 m in bed height are shown. This equipment consists of three main parts, the optical fiber sensor, the signal converter and amplifier and the data process system. The sensor is made of a bundle of fine optical fibers and is designed to measure the flow velocity, flow direction and the concentration, on the basis of the light correlation method for flow velocity and light scattering method for concentration. This equipment has 4 kinds of sample rates (1 MHz, 0.5 MHz, 0.25 MHz and 0.125 MHz) so the particle velocities from 0.5 to 25 m/s can be measured by use of different sample rates. The concentration ranges from 0.1 to 20 kg/m$+3$/. It has been confirmed that the measuring precision is about plus or minus 3% and plus or minus 5% for the flow velocity and concentration, respectively. !4
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机译：摘要：由于缺乏合适的测量方法，如今人们对固相两相流中颗粒的行为知之甚少。在本文中，开发了一种基于光纤传感器技术的新设备来测量粒子的速度和浓度。显示了在四个侧面的50 cm气体床和4.2 m床高度的气体流化床中的测量结果。该设备包括三个主要部分，光纤传感器，信号转换器和放大器以及数据处理系统。该传感器是由一束细小的光纤制成的，旨在根据流速的光相关方法和浓度的光散射方法来测量流速，流向和浓度。该设备具有4种采样率（1 MHz，0.5 MHz，0.25 MHz和0.125 MHz），因此可以通过使用不同的采样率来测量从0.5到25 m / s的粒子速度。浓度范围为0.1至20 kg / m $ + 3 $ /。已经证实，对于流速和浓度，测量精度分别为约±3％和±5％。 ！4
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