公开(公告)号：US06788840B2

公开(公告)日：2004-09-07

申请号：US10365370

申请日：2003-02-12

Applicant: Robert E. Stewart ,  Agop H. Cherbettchian ,  Samuel Fersht ,  David B. Hall

Inventor： Robert E. Stewart ,  Agop H. Cherbettchian ,  Samuel Fersht ,  David B. Hall

IPC: G02B626

CPC classification number: G02B6/358 ,  B81B3/0024 ,  B81B2201/045 ,  B81B2203/0109 ,  B81B2203/051 ,  B81B2203/053 ,  G02B6/3512 ,  G02B6/3514 ,  G02B6/3518 ,  G02B6/3546 ,  G02B6/3548 ,  G02B6/3576 ,  G02B6/3584 ,  G02B26/0841 ,  G02B26/0866 ,  H01H2001/0042

Abstract: A bi-stable micro-actuator is formed from a first and a second silicon-on-insulator wafer fused together at an electrical contact layer. A cover with a V-groove defines an optical axis. A collimated optical signal source in the V-groove couples an optical signal to an optical port in the V-groove. A mirror surface on a transfer member blocks or reflects the optical signal. The transfer member has a point of support at the first and second end. The mirror blocks or reflects the optical axis. An expandable structure applies a compressive force between the first and second point of support of the transfer member along a compressive axis to hold the transfer member in a bowed first state or a bowed second state. A control signal applied to a heating element in the expandable structure reduces the compressive force, switching the transfer member to a second state.

Abstract translation: 双稳态微致动器由在电接触层处熔合在一起的第一和第二绝缘体上硅晶片形成。 具有V形槽的盖子定义了光轴。 V沟槽中的准直光信号源将光信号耦合到V沟槽中的光端口。 转印部件上的镜面阻挡或反射光信号。 传送构件在第一和第二端具有支撑点。 镜子阻挡或反射光轴。 可膨胀结构沿着压缩轴线在转移构件的第一和第二支撑点之间施加压缩力，以将转印构件保持在弯曲的第一状态或弯曲的第二状态。 施加到可膨胀结构中的加热元件的控制信号减小了压缩力，将转印构件切换到第二状态。

公开(公告)号：US06288975B1

公开(公告)日：2001-09-11

申请号：US09429067

申请日：1999-10-29

Applicant: Donald A. Frederick ,  Michael J. Carter ,  Samuel Fersht ,  David C. Winslow

Inventor： Donald A. Frederick ,  Michael J. Carter ,  Samuel Fersht ,  David C. Winslow

IPC: G01V140

CPC classification number: G01V1/186 ,  G01H9/004 ,  G01V1/40 ,  Y10S367/912

Abstract: A system for sensing subterranean acoustic waves emitted from an acoustic source includes a plurality of laser sources, a plurality of subterranean optical sensors, at least one optical detector, and electronics. The laser sources each emit light at a different frequency. The subterranean optical sensors receive the light and alter the light in response to the acoustic waves. The optical detector receives the altered light and outputs an electrical signal. The electronics receives the electrical signal and converts it into seismic data format. Preferably, the light emitted from the optical sources is modulated at a plurality of modulation frequencies. The electronics can be used to demodulate the signal. The electronics may demodulate the electrical signal by mixing the signal with periodic waveforms having frequencies corresponding to the modulation frequencies and twice the modulation frequencies. The modulation frequencies are selected such that at least one of the second harmonic frequencies associated with the modulation frequencies is interleaved in a non-interfering manner within the corresponding set of first harmonic frequencies. Preferably, the modulation frequencies are selected such that at least one of the first harmonic frequencies is interleaved in a non-interfering manner within the corresponding set of modulation frequencies. The hydrophone for sensing the acoustic signals is able to operate at pressures of at least 5,000 psi and temperatures of at least 130 degrees Celsius. The hydrophone may be housed in a cable having a diameter of less than about 1.5 inches. The hydrophone's sensor preferably includes a reference mandrel, two sensing mandrels, and a telemetry can, all of which are aligned in a coaxial, end-to-end configuration to reduce the profile of the hydrophone. Flexible interlinks having grooves therein for receiving optical fiber join the mandrels together. The reference mandrel and sensing mandrels advantageously have hemispherically-shaped endcaps, permitting them to operate at high pressure.

公开(公告)号：US06591027B2

公开(公告)日：2003-07-08

申请号：US09794773

申请日：2001-02-27

Applicant: Robert E. Stewart ,  Agop H. Cherbettchian ,  Samuel Fersht ,  David B. Hall

Inventor： Robert E. Stewart ,  Agop H. Cherbettchian ,  Samuel Fersht ,  David B. Hall

IPC: G02B626

CPC classification number: G02B26/0866 ,  B81B3/0024 ,  B81B2201/045 ,  B81B2203/0109 ,  B81B2203/051 ,  B81B2203/053 ,  G02B6/3514 ,  G02B6/3518 ,  G02B6/3546 ,  G02B6/358 ,  G02B6/3584 ,  G02B26/0841 ,  H01H2001/0042

Abstract: A bi-stable micro-actuator is formed from a first and a second silicon-on-insulator wafer fused together at an electrical contact layer. A cover with a V-groove defines an optical axis. A collimated optical signal source in the V-groove couples an optical signal to an optical port in the V-groove. A mirror surface on a transfer member blocks or reflects the optical signal. The transfer member has a point of support at the first and second end. The mirror blocks or reflects the optical axis. An expandable structure applies a compressive force between the first and second point of support of the transfer member along a compressive axis to hold the transfer member in a bowed first state or a bowed second state. A control signal applied to a heating element in the expandable structure reduces the compressive force, switching the transfer member to a second state.

Abstract translation: 双稳态微致动器由在电接触层处熔合在一起的第一和第二绝缘体上硅晶片形成。 具有V形槽的盖子定义了光轴。 V沟槽中的准直光信号源将光信号耦合到V沟槽中的光端口。 转印部件上的镜面阻挡或反射光信号。 传送构件在第一和第二端具有支撑点。 镜子阻挡或反射光轴。 可膨胀结构沿着压缩轴线在转移构件的第一和第二支撑点之间施加压缩力，以将转印构件保持在弯曲的第一状态或弯曲的第二状态。 施加到可膨胀结构中的加热元件的控制信号减小了压缩力，将转印构件切换到第二状态。