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    • 6. 发明授权
    • Multi-tunable microelectromechanical system (MEMS) resonators
    • 多可调谐微机电系统(MEMS)谐振器
    • US07095295B1
    • 2006-08-22
    • US10443951
    • 2003-05-21
    • Harold L. StalfordMichael A. ButlerW. Kent Schubert
    • Harold L. StalfordMichael A. ButlerW. Kent Schubert
    • H03H9/46
    • H03H9/02409
    • A method for tuning a vibratory device including a cantilevered resonator comprising the steps of increasing a voltage V0 supplied to the vibratory device to thereby increase the bandwidth of the vibratory device; and keeping the resonant frequency of the vibratory device at substantially that natural frequency of the cantilevered resonator, wherein the vibratory device comprises: a capacitor including a movable plate and a fixed plate spaced from each other, the movable plate being part of the cantilevered resonator; a voltage source connected to the capacitor for providing voltage V0 across the capacitor to produce an attractive force between movable plate and fixed plate; a circuit connecting the voltage source to the capacitor; and a load resistor in said circuit having a resistance RL satisfying the following equation: μ = ω 0 ⁢ c 0 ⁢ R L ( 1 - λ ) where: μ is at least 10; ω0 is the beam constant for the cantilevered resonator; c0 is the capacitance for the capacitor; and λ is the voltage dependent coupling parameter for voltage V0.
    • 一种用于调谐包括悬臂谐振器的振动装置的方法,包括以下步骤:增加提供给振动装置的电压V SUB,从而增加振动装置的带宽; 并且将所述振动装置的谐振频率保持在所述悬臂谐振器的基本固有频率,其中所述振动装置包括:包括可移动板和彼此间隔开的固定板的电容器,所述可移动板是所述悬臂谐振器的一部分; 连接到电容器的电压源,用于在电容器之间提供电压V 0以在可动板和固定板之间产生吸引力; 将电压源连接到电容器的电路; 并且所述电路中的负载电阻具有满足以下等式的电阻R L: < MROW> = 1 - > 其中:mu至少为10; ω= 0是针对悬臂谐振器的光束常数; c <0>电容器的电容; 而λ是电压V 0 0的电压相关耦合参数。
        • 7. 发明授权
        • Micro acoustic spectrum analyzer
        • 微声谱分析仪
        • US06822929B1
        • 2004-11-23
        • US10606526
        • 2003-06-25
        • W. Kent SchubertMichael A. ButlerDouglas R. AdkinsLarry F. Anderson
        • W. Kent SchubertMichael A. ButlerDouglas R. AdkinsLarry F. Anderson
        • G01N3300
        • B06B1/0292G01H3/00G01H3/08G01H3/12G01N29/14G01N29/42G01N29/46H04R1/44H04R29/00
        • A micro acoustic spectrum analyzer for determining the frequency components of a fluctuating sound signal comprises a microphone to pick up the fluctuating sound signal and produce an alternating current electrical signal; at least one microfabricated resonator, each resonator having a different resonant frequency, that vibrate in response to the alternating current electrical signal; and at least one detector to detect the vibration of the microfabricated resonators. The micro acoustic spectrum analyzer can further comprise a mixer to mix a reference signal with the alternating current electrical signal from the microphone to shift the frequency spectrum to a frequency range that is a better matched to the resonant frequencies of the microfabricated resonators. The micro acoustic spectrum analyzer can be designed specifically for portability, size, cost, accuracy, speed, power requirements, and use in a harsh environment. The micro acoustic spectrum analyzer is particularly suited for applications where size, accessibility, and power requirements are limited, such as the monitoring of industrial equipment and processes, detection of security intrusions, or evaluation of military threats.
        • 用于确定波动声音信号的频率分量的微声频谱分析仪包括麦克风拾取波动的声音信号并产生交流电信号; 至少一个微制造谐振器,每个谐振器具有不同的谐振频率,其响应于交流电信号而振动; 以及至少一个检测器,用于检测微加工的谐振器的振动。 微声频谱分析仪还可以包括混合器以将参考信号与来自麦克风的交流电信号混合,以将频谱移动到与微细谐振器的谐振频率更好匹配的频率范围。 微声谱分析仪可以专门设计用于便携性,尺寸,成本,精度,速度,功率要求和在恶劣环境中的使用。 微声谱分析仪特别适用于尺寸,可达性和功率要求有限的应用,例如监测工业设备和工艺,检测安全入侵或评估军事威胁。