公开(公告)号：US3833857A

公开(公告)日：1974-09-03

申请号：US40286573

申请日：1973-10-02

Applicant: NASA

Inventor： FLETCHER J ,  DICKENS L

IPC: H03F7/00 ,  H03F7/04

CPC classification number: H03F7/00 ,  H03F7/04

Abstract: A millimeter wave parametric amplifier structure and varactor diode mounting structure therefor includes a housing within which is a pump frequency waveguiding channel and an intersecting signal frequency transmission line. The transmission line has a center conductor portion which protrudes into the pump channel. A portion of the housing forms the outer conductor of the transmission line. A pair of uncased varactor diode chips within the channel are stacked and connected in series across the wave guiding channel and are connected in parallel with respect to the inner and outer conductors of the signal transmission line. An adjustable stub means protrudes into the waveguiding channel adjacent the stacked varactor diode chips and defines a capacitive gap across the channel for series resonating the diode chips at an idler frequency. The stub means is located close to the stacked diode chips to provide a short return path for idler current generated by the diodes. The diodes, the stub means and the protruding portion of the center conductor are carried by a thin conducting wafer removably retained by the housing.

公开(公告)号：US3831117A

公开(公告)日：1974-08-20

申请号：US30665272

申请日：1972-11-15

Applicant: NASA

Inventor： FLETCHER J ,  KLINE A

IPC: H03H11/12 ,  H03H11/48 ,  H03H7/44 ,  H03H11/00

CPC classification number: H03H11/126 ,  H03H11/483

Abstract: A circuit using a differential amplifier multiplies the capacitance of a discrete integrating capacitor by (R1 + R2)/R2 where R1 and R2 are values of discrete resistor coupling an input signal e1 to the amplifier inputs. The output eo of the amplifier is fed back and added to the signal coupled by the resistor R2 to the amplifier through a resistor of value R1. A discrete resistor Rx may be connected in series for a lag filter and a discrete resistor may be connected in series with the capacitor for a lead-lag filter. Voltage dividing resistors Ra and Rb may be included in the feedback circuit of the amplifier output eo to independently adjust the overall circuit gain ei/eo.

Abstract translation: 使用差分放大器的电路将离散积分电容器的电容乘以（R1 + R2）/ R2，其中R1和R2是将输入信号e1耦合到放大器输入的分立电阻的值。 放大器的输出eo被反馈，并通过电阻器R1加到由电阻器R2耦合到放大器的信号。 分立电阻器Rx可以串联连接用于滞后滤波器，并且分立电阻器可以与用于引线滞后滤波器的电容器串联连接。 分压电阻器Ra和Rb可以包括在放大器输出端的反馈电路中，以独立地调整整个电路增益ei / e o。

公开(公告)号：US3816657A

公开(公告)日：1974-06-11

申请号：US29712872

申请日：1972-10-12

Applicant: NASA

Inventor： FLETCHER J ,  HOPKINS P ,  WALLINGFORD W

IPC: H04L27/20 ,  H04L27/24

CPC classification number: H04L27/2057

Abstract: A communication system using differential phase-shift-keying (DPSK) transmits and receives binary data without requiring timing or phase reference signals. The system encodes and modulates the data at the transmitter, and decodes and demodulates the data at the receiver, without ambiguity as to the data content.

公开(公告)号：US3814350A

公开(公告)日：1974-06-04

申请号：US34360773

申请日：1973-03-21

Applicant: NASA

Inventor： FLETCHER J ,  WETZLER D

IPC: B64G1/00 ,  B64G1/64 ,  B64G1/10

CPC classification number: B64G1/641 ,  B64G1/002

Abstract: A supporting frame for a load, such as one or more telescopes, is isolated from all multi-gravitational forces, which will be developed within that load as that load is propelled into space, by using a shroud to fully and solidly hold that load until that load has been propelled into space. Thereafter, that shroud will be jettisoned; and then supports which are on, and which are movable with, that load will have surfaces thereon moved into supporting engagement with complementary surfaces on that supporting frame to enable that supporting frame and those supports to fully and solidly hold that load.

Abstract translation: 用于诸如一个或多个望远镜的负载的支撑框架与所有多重力隔离，所述多重重力将通过使用护罩完全和牢固地保持该负载直到 那个负载被推进太空。 此后，该护罩将被抛弃; 然后支撑件，其上是可移动的，该负载将使其上的表面移动成与该支撑框架上的互补表面支撑接合，以使支撑框架和那些支撑件能够完全和牢固地保持该负载。

公开(公告)号：US3812924A

公开(公告)日：1974-05-28

申请号：US34079173

申请日：1973-03-13

Applicant: NASA ,  VALINSKY J

Inventor： FLETCHER J

IPC: G01G1/18 ,  G01G3/14 ,  G01G19/00

CPC classification number: G01G1/18 ,  G01G3/1402

Abstract: A remotely operable device for detecting changes as they occur in the mass of a selected specimen. The device is characterized by a balance beam including at one end thereof a support for receiving a specimen having a changing mass and suspension means, including a flexure, supporting the beam near its center of gravity for pivotal movement imparted thereto proportionally to changes occurring in the mass of the specimen, and strain gages coupled with the flexure for providing a read-out indicative of the pivotal movement imparted to the beam.

Abstract translation: 一种可远程操作的装置，用于当所选样本的质量发生时检测变化。 该装置的特征在于平衡梁，其一端包括用于接收具有变化的质量和悬挂装置的试样的支撑件，该支架包括挠曲件，该挠曲件支撑梁的重心附近，用于与其成比例地发生的转动， 样品的质量以及与挠曲件相结合的应变计，用于提供指示向梁施加的枢转运动的读出。

公开(公告)号：US3812358A

公开(公告)日：1974-05-21

申请号：US37214873

申请日：1973-06-21

Applicant: NASA

Inventor： FLETCHER J ,  KRAUSHAAR W

IPC: H01J47/06 ,  G01T1/18 ,  H01J39/28

CPC classification number: H01J47/06

Abstract: A coaxial anode construction for a gas radiation counter is disclosed by which undesirable background ionization interference may be suppressed. The anode comprises an elongated central wire covered with an electrically insulating sleeve. A plurality of longitudinally discontinuous segments of an electrically conductive coating is disposed about the insulating sleeve in coaxial relationship to and along the length of the central wire. In the preferred inventive embodiment, the plurality of conductive coating segments define a so-called veto or rejection anode at each end portion of the central wire and a main or primary charge detecting anode disposed therebetween. Coupling means are connected to each of the segments such that the primary charge detecting anode is connected to detection circuitry in anti-coincidence with the veto anodes. Background radiation detected by either of the veto anodes and the primary charge detecting anode is therefore rejected and the sensitivity of the radiation counter device is increased.

公开(公告)号：US3804506A

公开(公告)日：1974-04-16

申请号：US36190673

申请日：1973-05-21

Applicant: NASA

Inventor： DOUGHERTY H ,  FLETCHER J ,  CABLE W

IPC: G03B9/08 ,  G03B9/16 ,  G03B9/42

CPC classification number: G03B9/08

Abstract: A camera shutter assembly having a pair of superposed opaque planar shutter blades, each having an aperture and being arranged for reciprocal linear movement is disclosed. A pair of rotary solenoids, each connected to one of the blades by a linkage and arranged to be actuated separately at a predetermined interval is provided. An inertia damper and stop plate is built into each solenoid to prevent rebound.

Abstract translation: 公开了一种具有一对重叠的不透明平面快门叶片的相机快门组件，每个具有孔径并被布置为用于往复线性运动。 提供了一对旋转螺线管，每个旋转螺线管通过联动装置连接到一个叶片并被布置为以预定间隔单独致动。 每个螺线管内置惯性阻尼器和止动板，以防止回弹。

公开(公告)号：US3802779A

公开(公告)日：1974-04-09

申请号：US26024172

申请日：1972-06-06

Applicant: NASA

Inventor： FLETCHER J ,  LANSING J ,  CLINE R

IPC: G02B26/12 ,  G01B11/26

CPC classification number: G02B26/127

Abstract: An optical system monitors the angular position of a rotating scanning mirror to indicate the effective start and end of each scan. At a certain angular position, a ray of energy transmitted to the mirror is reflected a plurality of times between the reflectors associated with the optical system and the line on the mirror parallel to the axis thereof, and then to a detector to sense that angular position. A single optical system may be arranged to sense a plurality of different angular positions for each revolution of the mirror.

Abstract translation: 光学系统监视旋转扫描镜的角度位置以指示每次扫描的有效开始和结束。 在某个角度位置，传输到反射镜的能量射线在与光学系统相关联的反射器和平行于其轴线的反射镜之间多次反射，然后被反射到检测器以感测该角度位置 。 单个光学系统可以布置成感测反射镜的每一转的多个不同的角位置。

公开(公告)号：US3800224A

公开(公告)日：1974-03-26

申请号：US33391273

申请日：1973-02-20

Applicant: NASA

Inventor： FLETCHER J ,  HONNELL M

IPC: H04N5/50 ,  H04B1/04

CPC classification number: H04N5/50

Abstract: An automatic frequency control circuit for an F.M. television transmitter in which the frequency of the transmitter is sampled during what is termed the ''''back porch'''' portion of the horizontal synchronizing pulse which occurs during the retrace interval, the frequency sample compared with the frequency of a reference oscillator, and a correction applied to the frequency of the transmitter during this portion of the retrace interval.

Abstract translation: 一种用于F.M.的自动频率控制电路 电视发射机，其中在回扫间隔期间发生的所谓的水平同步脉冲的“后沿”部分期间对发射机的频率进行采样，频率采样与参考振荡器的频率相比较，以及应用于 在回扫间隔的这一部分期间发射机的频率。

公开(公告)号：US3795448A

公开(公告)日：1974-03-05

申请号：US3795448D

申请日：1972-06-28

Applicant: NASA

Inventor： FLETCHER J ,  AISENBERG SOL

IPC: G01P3/36 ,  G01P5/00

CPC classification number: G01P3/366 ,  G01P5/00

Abstract: A system for measuring velocities of radiating particles based on doppler shift is disclosed. Light from the particles is directed through a narrow band optical filter to a Fabry-Perot interferometer initially tuned to a selected center line corresponding to zero particle doppler shift. The movable mirror of the interferometer is made to sweep about the center line by the output of a modulation oscillator. The fringe pattern output is imaged onto a pin hole through which light is directed to a photomultiplier. The output of the photomultiplier is supplied to a phase sensitive detector which is supplied with the oscillator output as a reference signal and which operates in the quadrature mode. The detector''s output is gain controlled and is combined with the oscillator''s output to adjust the interferometer''s movable mirror to acquire the line center.

Abstract translation: 公开了一种用于测量基于多普勒频移的辐射颗粒速度的系统。 来自颗粒的光通过窄带滤光器被引导到最初调谐到对应于零粒子多普勒频移的选定中心线的法布里 - 珀罗干涉仪。 通过调制振荡器的输出使干涉仪的可移动反射镜围绕中心线扫描。 条纹图案输出被成像到针孔上，光穿过该孔被引导到光电倍增管。 光电倍增器的输出被提供给相位敏感检测器，该检测器被提供有作为参考信号的振荡器输出并以正交模式工作。 检测器的输出是增益控制的，并与振荡器的输出相结合，以调整干涉仪的可移动反射镜以获得线路中心。