公开(公告)号：WO1990010205A1

公开(公告)日：1990-09-07

申请号：PCT/US1990000128

申请日：1990-01-08

Applicant: SUNDSTRAND DATA CONTROL, INC.

Inventor： SUNDSTRAND DATA CONTROL, INC. ,  BLAKE, Graeme, A. ,  NORLING, Brian, L.

IPC: G01L01/10

CPC classification number: G01P15/097 ,  G01L1/10 ,  G01L1/183 ,  Y10S73/01

Abstract: A dual vibrating beam force transducer having an electrostatic drive system. The transducer comprises a body (12) having first and second generally parallel beams (20, 22), coupled together at their ends. First and second electrodes (14, 16) are positioned adjacent to but not in contact with the respective beams. A drive circuit (18) causes an oscillating voltage to be applied to the electrodes. The beams are thus subjected to electrostatic forces that cause the beams to oscillate in a vibration plane containing both beams. The mechanical resonance of the beams controls the oscillation frequency, such that the frequency is a function of a force exerted along the beams. An embodiment is also described in which the drive means is coupled directly to one of the beams.

公开(公告)号：WO1990005988A1

公开(公告)日：1990-05-31

申请号：PCT/US1989004440

申请日：1989-10-10

Applicant: SUNDSTRAND DATA CONTROL, INC.

Inventor： SUNDSTRAND DATA CONTROL, INC. ,  WAHLS, Karl, H.

IPC: H01H37/52

CPC classification number: H01H37/54

Abstract: Thermal actuators having a low temperature differential generally have a weak snap action. To overcome the problem, a snap action thermal actuator (10) utilizes a pair of mechanically coupled bimetallic members (12, 14) having different temperature characteristics to provide a fast and positive snap action thermal actuator even when a low temperature differential is required. The actuator is particularly useful for controlling the operation of electrical contacts (20, 22) in a thermal switch.

Abstract translation: 具有低温度差的热致动器通常具有弱的卡扣动作。 为了克服这个问题，快速动作热致动器（10）利用具有不同温度特性的一对机械耦合的双金属构件（12,14），以便即使在需要低温差时也能提供快速且正向的快速动作热致动器。 致动器对于控制热开关中的电触头（20,22）的操作特别有用。

公开(公告)号：WO1990001703A1

公开(公告)日：1990-02-22

申请号：PCT/US1989003188

申请日：1989-07-24

Applicant: SUNDSTRAND DATA CONTROL, INC.

Inventor： SUNDSTRAND DATA CONTROL, INC. ,  PETERS, Rex, B. ,  CORNELIUS, Craig, J.

IPC: G01P15/00

CPC classification number: G01P15/097 ,  G01L1/162

Abstract: A matched pair of vibrating beam force transducers (28, 30) for use in an instrument such as an accelerometer, to provide enhanced linearity and common mode tracking, while decreasing the possibility of lock in or cross-talk between the transducers. In a preferred embodiment, first and second transducers are provided, the transducers producing respective first and second output signals having respective first and second frequencies. The transducers are connected in an arrangement in which for a given acceleration, one frequency increases and the other frequency decreases. The first transducer comprises a pair of first beams (52, 54), and the second transducer comprises a pair of second beams (52, 54). The beam dimensions are selected such that the Euler buckling constants of the first and second beams are substantially equal to one another, and such that the first and second frequencies are different from one another when the acceleration is zero and preferably are different from one another throughout the operating range of the accelerometer. In preferred arrangements, the transducer beams have a constant thickness, and the transducers have common axial stiffnesses.

公开(公告)号：WO1989001655A1

公开(公告)日：1989-02-23

申请号：PCT/US1988002652

申请日：1988-08-04

Applicant: SUNDSTRAND DATA CONTROL, INC.

Inventor： SUNDSTRAND DATA CONTROL, INC. ,  HULSING, Rand, H.

IPC: G05B13/00

CPC classification number: G01C19/5776

Abstract: A servo loop control for the dither drive of a Coriolis rate sensor is provided. The dither drive includes a pair of electromagnetic coils (70), which are alternately energized to dither a parallelogram frame (50), on which first and second accelerometers (20 and 22) are mounted with their sensitive axes antiparallel to each other. An LVDT position sensor (106) provides a feedback signal indicating the relative position of the two accelerometers or displacement of the parallelogram frame as it is dithered back and forth. The position signal is summed with a driving signal, amplified and summed with a velocity aiding signal and a velocity signal derived by differentiating the position signal. The resulting sum is amplified and again summed with an acceleration aiding input that includes compensation for a phase shift in the motion of the parallelogram frame relative to the driving force applied by the electromagnet coils, and for (I2 and 1/D2) nonlinearities where I is the current and D is the pole gap dimension (114). The sum of these signals is used to energize the electromagnetic coils, driving the parellelogram frame with a signal that causes it to dither in a pure sinusoidal fashion. Each of the critical frequencies used in the servo loop is phase locked to a common stable crystal reference frequency, and all components of the servo loop are powered by a common power supply. The servo loop provides improved frequency and phase stability and insensitivity to voltage fluctuations.

公开(公告)号：WO1988009537A1

公开(公告)日：1988-12-01

申请号：PCT/US1988001224

申请日：1988-04-18

Applicant: SUNDSTRAND DATA CONTROL, INC.

Inventor： SUNDSTRAND DATA CONTROL, INC. ,  GLOVER, J., Howard

IPC: G06F15/31

CPC classification number: H03H17/0263

Abstract: A fast median filter (22) is disclosed for filtering high frequency noise from signals, such as, signals (10, 14) from a radio altimeter. The filter (22) continuously provides the median of a predetermined number of points of the signal, which are received in an array, by successively comparing (60) each data point in the array with each other data point in the array. A counter is either incremented (62) or decremented (64) depending on the result of each comparison. If the counter reaches a predetermined value at the end of the sequence of comparisons, the median is determined. A pointer (30) keeps track of the oldest data point in the array (42). After the median is determined, a new data point is received into the array and written over the oldest data point (34). The median of the array is determined each time the array is updated with a new data point (32). When the pointer reaches the last position in the array, the pointer is reset to the first position and is subsequently incremented in the same manner (40).

Abstract translation: 公开了一种用于从诸如来自无线电高度计的信号（10,14）的信号过滤高频噪声的快速中值滤波器（22）。 滤波器（22）通过将阵列中的每个数据点与阵列中的每个其他数据点相连（60）连续地提供在数组中接收的信号的预定数量的点的中值。 根据每个比较的结果，计数器增加（62）或递减（64）。 如果计数器在比较序列结束时达到预定值，则确定中位数。 指针（30）跟踪阵列中最早的数据点（42）。 在确定中值后，将新的数据点接收到阵列中并写入最旧的数据点（34）。 每次使用新的数据点（32）更新数组时，确定阵列的中值。 当指针到达阵列中的最后一个位置时，指针将被重置为第一个位置，并以相同的方式递增（40）。

公开(公告)号：WO1988000351A1

公开(公告)日：1988-01-14

申请号：PCT/US1987001571

申请日：1987-06-25

Applicant: SUNDSTRAND DATA CONTROL, INC.

Inventor： SUNDSTRAND DATA CONTROL, INC. ,  NORLING, Brian, L.

IPC: G01P15/10

CPC classification number: G01P15/097 ,  G01P1/006 ,  G01P2015/0828

Abstract: Prior vibrating beam accelerometers are subject to errors caused by differential thermal expansion between the vibrating beams and other accelerometer components. This problem is overcome by the present accelerometer that comprises a housing (32), a proof mass (30), support means (34, 36) for mounting the proof mass with respect to the housing, and first and second force sensing elements (38, 40). The force sensing elements are connected between the proof mass and the housing such that differential thermal expansion or contraction between the force sensing elements and the proof mass, support means and housing results in rotation of the proof mass about a compensation axis (CA) normal to the sensitive axis (SA). The force sensing elements may extend from their respective points of connection to the proof mass in opposite directions parallel to the sensitive axis to their respective points of connection to the housing, and the force sensing elements may be connected to the proof mass at spaced apart positions on opposite sides of the compensation axis.

公开(公告)号：WO1988000348A1

公开(公告)日：1988-01-14

申请号：PCT/US1987001572

申请日：1987-06-25

Applicant: SUNDSTRAND DATA CONTROL, INC.

Inventor： SUNDSTRAND DATA CONTROL, INC. ,  NORLING, Brian, L. ,  TONN, Jeffrey, F.

IPC: G01P01/00

CPC classification number: G01P1/023 ,  G01D11/30

Abstract: The mounting system of the present invention is adapted to support a precision transducer (14) in spaced alignment with a supporting case (12). The mounting system comprises a plurality of mounting elements (30), each mounting element having one end (34), an opposite end (32) and a resilient intermediate portion (36). One end is adapted to be connected to the transducer, and the opposite end is adapted to be connected to the case. Adjacent mounting elements are joined to one another by bridge sections (38) to form a continuous mounting ring (16) and to define a plurality of gaps (56). At least the end connected to the transducer and bridge sections is composed of a substance that has a coefficient of thermal expansion approximately equal to the coefficient of thermal expansion of the transducer. Each intermediate portion is configured to provide a low resistance to relative movement between the transducer and case in a radial direction, and a high resistance to relative movement in other directions.

Abstract translation: 本发明的安装系统适于支撑与支撑壳体（12）间隔对准的精密换能器（14）。 安装系统包括多个安装元件（30），每个安装元件具有一端（34），相对端（32）和弹性中间部分（36）。 一端适于连接到换能器，并且相对端适于连接到壳体。 相邻的安装元件通过桥接部分（38）彼此连接以形成连续的安装环（16）并且限定多个间隙（56）。 至少连接到换能器和桥接部分的端部由具有大约等于换能器的热膨胀系数的热膨胀系数的物质组成。 每个中间部分构造成对径向方向上的换能器和壳体之间的相对运动提供低阻力，并且对其它方向的相对运动具有高阻力。

公开(公告)号：WO1987006351A1

公开(公告)日：1987-10-22

申请号：PCT/US1987000872

申请日：1987-04-15

Applicant: SUNDSTRAND DATA CONTROL, INC.

Inventor： SUNDSTRAND DATA CONTROL, INC. ,  NORLING, Brian, L.

IPC: G01P15/13

CPC classification number: G01P15/132

Abstract: An accelerometer comprising a proof mass assembly that includes a reed (26) suspended from a support (22) and a cylindrical coil mounted to the reed by a mounting system that minimizes errors due to thermal stress. The mounting system comprises at least three mounting elements. Each mounting element (114) has first and second ends, and a resilient intermediate portion. The first end of each mounting element connected to the coil (78), the second end of each mounting element is connected to the reed (72) and the intermediate portion of each mounting element provides a low resistance to relative movement between the coil and reed in a radial direction, and a high resistance to relative movement between the coil and reed in directions normal to the radial direction. The reed preferably comprises fused quartz, and the mounting system preferably comprises a fused quartz base (106) mounted directly to the reed and connected to the second end of each mounting element. The coil may be mounted on a coil form that is connected directly to the first end of each mounting element.

公开(公告)号：WO1987004582A1

公开(公告)日：1987-07-30

申请号：PCT/US1987000090

申请日：1987-01-14

Applicant: SUNDSTRAND DATA CONTROL, INC.

Inventor： SUNDSTRAND DATA CONTROL, INC. ,  KIRSCHNER, Robert, K. ,  MULLER, Hans, R.

IPC: H04N07/18

CPC classification number: G02B27/0101 ,  B60K2350/1064 ,  B60K2350/2052 ,  B60K2350/405 ,  G02B2027/0154 ,  G02B2027/0156 ,  G02B2027/0165 ,  G02B2027/0169

Abstract: An independant test sight (18) for a pilot's head-up display (HUD). In one embodiment, the independent test sight comprises a collimator assembly (36) and an aligned periscope assembly (38). The collimator assembly comprises a source of light (42), a reticle (46), and a lens (48) for projecting the image of the reticle. The periscope assembly comprises a rhomboid prism (56) housed within the chassis (22) of the HUD (12) in such a manner that it can be pivoted from a stowed position to an erect position where it projects a reticle pattern in the field of view of the HUD combiner.

公开(公告)号：WO1987004241A1

公开(公告)日：1987-07-16

申请号：PCT/US1986002765

申请日：1986-12-19

Applicant: SUNDSTRAND DATA CONTROL, INC.

Inventor： SUNDSTRAND DATA CONTROL, INC. ,  PAROS, Jerome, M. ,  TONN, Jeffrey, Forrest ,  WEARN, Richard, R.

IPC: G01K11/22

CPC classification number: G01K7/32

Abstract: Prior mounting systems for tuning fork temperature sensors have resulted in unpredictable activity dips within the sensor operating ranges. This problem is eliminated by the mounting and isolation system (32) of the present invention that is adapted to mount temperature sensitive tuning fork (20) to a support structure. The mounting system comprises a mounting member (34) adapted for rigid connection to the support structure, and support means (36) connecting the tuning fork base to the mounting member such that the tuning fork is supported solely by the support means. The support means comprises a low pass mechanical filter that transmits only vibration frequencies that are less than the operating range of frequencies of the tuning fork.