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    • 5. 发明授权
    • Electric circuit for tuning a capacitive electrostatic transducer
    • 用于调谐电容式静电传感器的电路
    • US07670290B2
    • 2010-03-02
    • US10803808
    • 2004-03-17
    • John A. HossackBrett BymasterIgal LadabaumPaul A. WagnerChristopher M. W. Daft
    • John A. HossackBrett BymasterIgal LadabaumPaul A. WagnerChristopher M. W. Daft
    • A61B8/00
    • B06B1/0292A61B8/4483G01S7/52079
    • An electrostatic transducer circuit and method of tuning the same, in which a balancing circuit is inserted into the electrostatic transducer circuit, is described. The electrostatic transducer circuit generally includes transmit circuitry, receive circuitry, a capacitive electrostatic transducer and the balancing circuit. The balancing circuit can include, either singly or in combination, an inductance and a negative capacitance. The balancing inductance is tuned to counteract the negative reactance of the capacitive electrostatic transducer at a desired operating frequency and can be inserted into the transmit circuitry and/or the receive circuitry. The balancing negative capacitance is tuned to counteract the capacitance of the capacitive electrostatic transducer and can be inserted into the receive circuitry and/or the transmit circuitry. The transmit circuitry can be isolated from the receive circuitry, and vice versa, once the balancing circuit has been inserted. Isolation can be achieved by switching the electrostatic transducer circuit between transmit and receive modes of operation, or by providing separate transmit and receive electrode subsets.
    • 描述了一种静电换能器电路及其调谐方法,其中平衡电路插入到静电换能器电路中。 静电换能器电路通常包括发射电路,接收电路,电容式静电变换器和平衡电路。 平衡电路可以单独地或组合地包括电感和负电容。 调整平衡电感以抵消在期望的工作频率下的电容式静电换能器的负电抗并且可以插入到发射电路和/或接收电路中。 调整平衡负电容以抵消电容式静电变换器的电容,并可将其插入接收电路和/或发射电路。 一旦平衡电路被插入,发射电路可以与接收电路隔离,反之亦然。 可以通过在发射和接收工作模式之间切换静电转换器电路,或通过提供单独的发射和接收电极子集来实现隔离。
    • 6. 发明授权
    • Microfabricated acoustic transducer with suppressed substrate modes
    • 具有抑制衬底模式的微型声学传感器
    • US06714484B2
    • 2004-03-30
    • US10280317
    • 2002-10-25
    • Igal LadabaumPaul A. Wagner
    • Igal LadabaumPaul A. Wagner
    • H04R1700
    • B06B1/0681B06B2201/76
    • A microfabricated acoustic transducer with suppressed substrate modes includes a diaphragm containing an upper electrode suspended above a substrate containing a lower electrode; the substrate may or may not contain electronic circuits. The substrate modes are suppressed by either thinning the substrate such that a longitudinal ringing mode occurs outside of the frequency band of interest or applying a judiciously designed damping material that absorbs acoustic energy from the substrate on the backside of the transducer substrate, or by both thinning the substrate and applying the damping material. The damping material has an acoustic impedance that matches the acoustic impedance of the substrate and is lossy.
    • 具有抑制衬底模式的微加压声换能器包括:隔膜,其包含悬浮在含有下电极的衬底上方的上电极; 衬底可以包含或可以不包含电子电路。 通过使衬底变薄来抑制衬底模式,使得纵向振铃模式发生在感兴趣的频带之外,或施加明智地设计的阻尼材料,其从换能器衬底的背面上的衬底吸收声能,或者通过减薄 衬底和施加阻尼材料。 阻尼材料具有与基底的声阻抗匹配的声阻抗并且是有损耗的。