Calculation of ultrasonic transducer signal-to-noise ratios using the KLM model
Calculation of ultrasonic transducer signal-to-noise ratios using the KLM model
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DOI：
10.1109/58.655627
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发表时间：
1997-09-01
影响因子：
3.6
通讯作者：
Oakley, CG
中科院分区：
文献类型：
--
作者：
Oakley, CG
本文介绍了一种方法，增加热噪声和放大器噪声的KLM模型的换能器元件。该模型是用来比较的幅度的各种噪声源在一个5 MHz的阵列元件典型的那些用于线性阵列成像与放大器。基本的信号噪声比（SNR）的重要性，阵列和放大器的设计者的问题进行了探讨，包括对SNR的有效介电常数的压电材料，单个元件的尺寸，改变元件的数量，并添加一个放大器的元件之前和之后的电缆。SNR被认为是用于其中声输出受到最大稀疏压力限制的情况，所述最大稀疏压力被认为对于特定应用是安全的（机械指数限制）以及声输出受成像系统可传递或换能器可承受的最大发射电压限制的情况下，结果表明，信噪比性能取决于许多可控参数，并通过适当的设计，可以实现显着改善信噪比，1.5-D和2-D阵列元素的影响进行了讨论。
This paper describes a method for adding thermal and amplifier noise to a KLM model for a transducer element. The model is used to compare the magnitudes of various noise sources in a 5 MHz array element typical of those used for linear array imaging with and without an amplifier. Fundamental signal-to-noise ratio (SNR) issues of importance to array and amplifier designers are explored, including the effect on SNR of effective dielectric constant of the piezoelectric material, individual element size, changing the number of elements, and adding an amplifier to an element before and after a cable. SNR is considered both for the case in which the acoustic output is limited by the maximum rarefactive pressure which is considered safe for a particular application (Mechanical Index limitation) and the case in which acoustic output is limited by the maximum transmit voltage than can be delivered by the imaging system or tolerated by the transducer, It is shown that the SNR performance depends on many controllable parameters and that significant improvements in SNR can be achieved through proper design, The implications for 1.5-D and 2-D array elements are discussed.