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首页> 外文期刊>International review of automatic control >A New Ultrasonic Exponential Decay Pulser Technique for Low Concentrations Detection and Measurements
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A New Ultrasonic Exponential Decay Pulser Technique for Low Concentrations Detection and Measurements

机译：用于低浓度检测和测量的新型超声波指数衰减脉冲发生器技术

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The objective of this study was to design and implement a new ultrasonic pulser with adjustable concentration detection. The new technique based on transmits a multiple ultrasound pulses with decay power through slurry to determine the lowest concentration that can provide an accurate attenuation measurement and wide measurement range. The ultrasonic pulser was designed to transmit a reliable pulsed-power decay set that can be reprogrammed with new output variables, e.g., the pulse amplitude, the pulse frequency, the set size, the decay power factor of the pulse amplitude, the transmit mode, and the time interval. Ultrasound attenuation measurements were obtain for kaolin-water slurries withl%, 10%, 20%, 30%, and 40% kaolin concentration by weight. Concentration attenuation measurements of less than 5% may prove useful for process control when detecting contaminants. A long measurement level is obtained from the pulsed-power transmission, regardless of the material used to construct the container. A signal in the receiver transducer provides the attenuation measurements, for each echo, a fast Fourier transform (FFT) of the appropriate signal was obtained and compared with the water signals to yield the attenuation (as a function of frequency). The data show the feasibility of measuring a kaolin concentration of less than 5 wt%. When using a commercial pulser with the same device setting, no detectable echo was observed. Therefore, new technique measurements may prove useful in detecting solid content in liquid. This study demonstrated that the proposed pulsed-power transmission technique is promising for evaluating low concentrations of solids in fluids and for measuring sedimentation in solid-liquid systems.
机译：这项研究的目的是设计和实现一种新型的可调节浓度检测的超声波脉冲发生器。该新技术基于通过泥浆传输具有衰减功率的多个超声波脉冲，以确定可以提供准确衰减测量和宽测量范围的最低浓度。超声波脉冲发生器的设计目的是传输可靠的脉冲功率衰减集，该集合可以用新的输出变量重新编程，例如，脉冲幅度，脉冲频率，设定大小，脉冲幅度的衰减功率因数，发射模式，和时间间隔。对于重量百分比为1％，10％，20％，30％和40％的高岭土-水浆液，获得了超声衰减测量值。浓度衰减测量值小于5％可能对检测污染物时的过程控制很有用。无论使用哪种材料构造容器，都可以通过脉冲功率传输获得长的测量水平。接收器换能器中的信号提供了衰减测量，对于每个回波，均获得了适当信号的快速傅立叶变换（FFT），并将其与水信号进行比较以得出衰减（作为频率的函数）。数据表明测量小于5重量％的高岭土浓度的可行性。当使用具有相同设备设置的商用脉冲发生器时，未观察到可检测到的回声。因此，新技术的测量可能证明对检测液体中的固体含量很有用。这项研究表明，提出的脉冲动力传输技术有望用于评估流体中低浓度的固体和测量固液系统中的沉降。

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