公开(公告)号：US5521555A

公开(公告)日：1996-05-28

申请号：US279509

申请日：1994-07-25

Applicant: Daniel A. Tazartes ,  John E. Higbee ,  Jacque A. Tazartes ,  Juergen K. P. Flamm ,  John G. Mark

Inventor： Daniel A. Tazartes ,  John E. Higbee ,  Jacque A. Tazartes ,  Juergen K. P. Flamm ,  John G. Mark

IPC: G01C19/72 ,  G01J1/44 ,  H03F3/08

CPC classification number: G01J1/44 ,  G01C19/721 ,  H03F3/082

Abstract: An amplifier topology for receiving signals output from a fiber optic rotation sensor and producing voltages that may be processed to determine the rotation rate includes a photodiode for receiving an optical signal and producing a corresponding electrical photodiode output signal. An ultra low noise and ultra low capacitance differential input stage is connected to receive the photodiode output signal. An operational amplifier having low noise and ultra-wide bandwidth is connected to the ultra low capacitance differential input stage to receive the output signal therefrom as a driving signal and to produce a low noise output signal. The differential input stage comprises a first amplifier circuit that includes a first transistor connected to the photodetector to act as a first buffer having low noise, low capacitance and unity gain. The first amplifier circuit also includes a second transistor configured as a first voltage follower connected between the output of the first buffer and the operational amplifier to isolate the output of the first buffer from parasitic capacitive loading from a biasing network. The differential input stage further comprises a second a second amplifier circuit that includes a third transistor having an input connected to a reference potential, the third transistor acting as a second buffer having low noise, low capacitance and unity gain. The second amplifier circuit also includes a fourth transistor configured as a second voltage follower connected between the output of the second buffer and the operational amplifier.

Abstract translation: 用于接收从光纤旋转传感器输出的信号并产生可被处理以确定旋转速率的电压的放大器拓扑包括用于接收光学信号并产生相应的光电二极管输出信号的光电二极管。 连接超低噪声和超低电容差分输入级，以接收光电二极管的输出信号。 具有低噪声和超宽带宽的运算放大器连接到超低电容差分输入级，以将其输出信号作为驱动信号接收并产生低噪声输出信号。 差分输入级包括第一放大器电路，其包括连接到光电检测器的第一晶体管，以充当具有低噪声，低电容和单位增益的第一缓冲器。 第一放大器电路还包括被配置为连接在第一缓冲器的输出端和运算放大器之间的第一电压跟随器的第二晶体管，以将第一缓冲器的输出与偏置网络的寄生电容负载隔离开来。 差分输入级还包括第二个第二放大器电路，其包括具有连接到参考电位的输入的第三晶体管，第三晶体管用作具有低噪声，低电容和单位增益的第二缓冲器。 第二放大器电路还包括被配置为连接在第二缓冲器的输出端和运算放大器之间的第二电压跟随器的第四晶体管。

公开(公告)号：US3943339A

公开(公告)日：1976-03-09

申请号：US465031

申请日：1974-04-29

Applicant: Ralph J. Koerner ,  Milton G. Bienhoff ,  Martin C. Henderson ,  John E. Higbee ,  Steve J. Koerner

Inventor： Ralph J. Koerner ,  Milton G. Bienhoff ,  Martin C. Henderson ,  John E. Higbee ,  Steve J. Koerner

IPC: G01V3/10 ,  G08G1/042 ,  G08G1/065 ,  G08G1/08

CPC classification number: G01V3/101 ,  G08G1/042

Abstract: Apparatus for use in combination with multiple inductive loops for detecting metal objects, e.g. vehicles, in the immediate vicinity of each of said loops. Each loop may, for example, be a coil of wire buried in a roadway in a plane parallel to the roadway surface. A common oscillator circuit is operatively connected to each loop on a time shared basis with the frequency of oscillation at any time being determined by the inductance of the connected loop. The inductance in turn is dependent on whether or not a vehicle is over the loop. Successive scan cycles are defined with multiple loop phases occurring during each scan cycle. During each loop phase, a different one of the multiple loops is connected to the oscillator circuitry and during a "period measurement" portion of each loop phase, the loop frequency is monitored by digital circuitry including a loop counter which counts loop oscillator cycles and a duration counter which measures the time duration or period of a certain number of such loop oscillator cycles. The measured time duration (period) is then compared with an historical reference duration (accumulated over prior scan cycles) during a "calculation and storage" portion of each loop phase to ascertain whether the loop oscillator frequency has increased or decreased. The presence of a vehicle over the loop decreases loop inductance, increases loop frequency, and thus reduces the measured period. A reduction in the measured period by an amount greater than a preselected threshold produces an output signal or "call" to indicate the vehicle's presence. In order to accommodate loop inductance variations attributable to slowly varying environmental conditions, the historical reference duration is caused to vary or "adapt" over a plurality of scan cycles in accordance with certain defined criteria. The duration counter counts cycles of a crystal oscillator and is used during each "period measurement" portion to measure a time duration and during each "calculation and storage" portion to define sequential control states for the performance of various arithmetic and logic operations.

公开(公告)号：US5850286A

公开(公告)日：1998-12-15

申请号：US854664

申请日：1997-05-12

Applicant: Daniel E. Auerbach ,  Amado Cordova ,  Eric L. Goldner ,  John E. Higbee ,  James R. Steele ,  Ka Kha Wong

Inventor： Daniel E. Auerbach ,  Amado Cordova ,  Eric L. Goldner ,  John E. Higbee ,  James R. Steele ,  Ka Kha Wong

IPC: G01P9/00 ,  G01C19/72

CPC classification number: G01C19/72

Abstract: An interferometric rotation rate sensor is arranged to overcome effects of the unavoidable generation of intensity spikes in the modulated optical output. An electrooptical device is located within the optical path of the sensor for receiving the optical output signal from the sensor coil and transforming it prior to application to the photodetector. The electrooptical device is driven by a periodic electrical signal with a period equal to the loop transit time of light traveling through the sensor coil. By synchronizing the periods of attenuation with the predictable presence of spikes in the optical output, valid optical signal information is preserved while gyro electronics are sheltered from the results of optical intensity spiking.

Abstract translation: 布置干涉式旋转速率传感器以克服调制光输出中不可避免的强度尖峰的产生的影响。 电光装置位于传感器的光路内，用于接收来自传感器线圈的光输出信号并在施加到光电检测器之前对其进行变换。 电光装置由周期性电信号驱动，周期等于通过传感器线圈的光的循环通过时间。 通过将衰减周期与光输出中的尖峰可预测存在同步，保留有效的光信号信息，同时避免了光强度尖峰的结果。