UC知道一段一段3 呵呵 高手无惧
来源：百度知道 编辑：UC知道 时间：2024/09/18 05:51:49
Figure 3 shows the experimental setup used for detection experiments. The sample is fixed on the top of a piezoelectric transducer. The transducer is excited at frequency v 1 , and the contacts to the artificial transmission line are made by microwave probes. The transmitted signal is monitored by a spectrum analyzer, and the output is plotted as a function of the ultrasound frequency in Fig. 4. The poles and zeros of the acoustic transducer are clearly seen at ( 2 k 1 1) 3 1.1 MHz, which are quite sharp because of the unloaded piezoelectric transducer. The frequency response of our detector is also observable from the plot. Roughly, the 3-dB bandwidth is 9 MHz with the resonance at 1.6 MHz. The input is a 10 mW rf signal at 200 MHz. For this input level, 80 nW output power corresponds to ; 100- nm peak vibration of the bridges. Considering thermal noise power at the output of the device, we see that the minimum detectable
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图3显示了实验装置用于检测实验. 样品被固定在顶部的压电传感器. 换兴奋频率为v 1 与接触人工传输线是由微波探头. 发送信号进行监测的频谱分析仪, 而产量是策划作为一个功能的超声频率分量. 4 . 极点和零点声学传感器都清楚地看到,在( 2钾1 ) 3 1.1兆赫, 而且很尖锐,因为卸载压电传感器. 频率响应的探测器,我们也是从看得见的阴谋. 大约3分贝带宽为9 MHz的共振为160兆赫. 输入为10兆瓦的射频信号,在200兆赫. 这种投入水平, 80 NW向输出功率对应; 100 nm的峰值振动的桥梁. 考虑热噪声功率输出的装置,我们看到的最小探测振动; 2.53 102 4 Å / ahz . 也就是说,对一个典型系统带宽为10千赫,排水量为0.025 Å被觉察. 输出信号是正比于RF频率(五0 ) , 和成反比平行板分离( × 0 ) . 如果我们增加射频频率,并减少了电极间距,我们可以进一步提高灵敏度的探测器
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