公开(公告)号：EP0236035B1

公开(公告)日：1991-05-29

申请号：EP87301521.8

申请日：1987-02-23

申请人： GEC-MARCONI LIMITED

发明人： Coleman, Clive Ian

IPC分类号： G01S3/78 ,  G01S7/48

CPC分类号： G01S3/782 ,  G01S7/4804

公开(公告)号：EP0357319A3

公开(公告)日：1991-05-15

申请号：EP89308497.0

申请日：1989-08-22

申请人： GEC-MARCONI LIMITED

发明人： Crickmore, Ian Roger

IPC分类号： G01J3/26 ,  G02F1/133 ,  G02B6/34

CPC分类号： G01J3/26 ,  G01J2003/1269 ,  G02F1/216 ,  G02F2203/055

摘要： A Fabry-Perot interferometer contains a twisted nematic liquid crystal (3) and means for applying an electric field across the crystal. The twist is suitably 90°. When a sufficient electric field is applied across the liquid crystal (3) the interferometer becomes insensitive to the polarisation of incident light.

公开(公告)号：EP0413804A1

公开(公告)日：1991-02-27

申请号：EP90904408.0

申请日：1990-03-09

申请人： GEC-MARCONI LIMITED ,  ALCAN INTERNATIONAL LIMITED

发明人： CLARKE, John, Brian ,  FITZPATRICK, Nigel, Patrick

IPC分类号： F03G7 ,  F28B1 ,  F28D1 ,  F28D9 ,  F28F3 ,  F28F9

CPC分类号： F28D1/0213 ,  F03G7/04 ,  F28B1/02 ,  F28D9/0031 ,  F28F3/14 ,  F28F9/0275 ,  F28F9/26 ,  F28F2250/102

摘要： On construit un échangeur thermique à l'aide de rangées de panneaux (25) fixés par laminage, immergées dans un réservoir (16) ouvert à la pression atmosphérique. Chaque rangée de panneaux est reliée en parallèle avec d'autres par un accouplement (36) à fermeture hermétique automatique, pouvant être déconnecté pour permettre l'entretien ou le remplacement de la rangée de panneaux sans perte de fluide de travail, et pendant le fonctionnement de l'échangeur thermique.

摘要翻译： 热交换器使用浸入在大气压力下打开的罐（16）中的辊固定排（25）构成。 每排面板通过自密封联接器（36）与其他面板并联连接，该自密封联接器（36）可以断开以允许维护或更换面板排而不损失工作流体，并且在操作期间 的热交换器。

公开(公告)号：EP0312261A3

公开(公告)日：1991-02-27

申请号：EP88309357.7

申请日：1988-10-07

申请人： GEC-MARCONI LIMITED

发明人： McGann, Melvyn

IPC分类号： H04N5/20

CPC分类号： H04N5/38 ,  H04N5/20

摘要： A linearity correction circuit for television transmission operates at intermediate frequency to introduce appropriate pre-distortion into the amplitude envelope to compensate for non-linearity in the power amplifier stages. An array of parallel current sources (11), each of which is independently adjustable in response to the perceived requirement for pre-distortion over a corresponding amplitude band, to inject a current sufficient to introduce an appropriate differential voltage at the output. The circuit provides for the independent correction of each amplitude band, so that it is capable of operation under microprocessor control in real time.

公开(公告)号：EP0397251A2

公开(公告)日：1990-11-14

申请号：EP90201128.7

申请日：1990-05-04

申请人： GEC-MARCONI LIMITED

发明人： Gowlett, David John, c/o Philips Components

IPC分类号： G01J5/06

CPC分类号： G01J5/061 ,  H01J7/18

摘要： A device chamber (12) is evacuated by pumping via an evacuation tube (35) to produce a vacuum space in communication with a chemically-active getter (30) which is provided in the tube (35) to getter gases from the evacuated chamber (12). In accordance with the invention, the getter (30) in the form of one or more movable bodies of the getter material is activated by heating in the evacuation tube (35) at a safe location (36) distant from the chamber (12). It is then moved towards the chamber (12) and is retained in the sealed evacuation-tube outlet (31) of the device. A vacuum-permeable screen (32) in the evacuation-tube outlet (31) inhibits passage of the getter material (30) into the chamber (12) where it might, for example, otherwise damage or obscure an infrared detector element. This permits the inclusion of the getter (30) in an inexpensive manner which does not require the use of a getter unit with a support element and/or vacuum-sealed electrical connections, and is compatible with space limitations and standard device envelope requirements for infrared detectors. Furthermore, the getter (30) is activated by heating at a location which avoids damage to the device, and after moving towards the chamber (12) the evacuation tube (35) is shortened to provide a short (or even non-protruding) outlet (31) from the chamber (12).

摘要翻译： 装置室（12）通过抽吸管（35）泵送而被排空，以产生与设置在管（35）中的化学活性吸气剂（30）连通的真空空间，以吸入来自抽空室的气体 12）。 根据本发明，吸气剂材料的一个或多个可移动体形式的吸气剂（30）通过在远离腔室（12）的安全位置（36）处在排气管（35）中加热来启动。 然后将其移动到腔室（12）并且被保持在装置的密封抽空管出口（31）中。 排气管出口（31）中的真空可渗透筛网（32）阻止吸气剂材料（30）进入腔室（12），否则可能会损坏或模糊红外线检测器元件。 这允许以便宜的方式包含吸气剂（30），其不需要使用具有支撑元件和/或真空密封电连接的吸气剂单元，并且与空间限制和红外线的标准装置包络要求兼容 探测器。 此外，吸气剂（30）通过在避免对设备的损坏的位置进行加热而被激活，并且在朝向腔室（12）移动之后，抽真空管（35）被缩短以提供短（或甚至非突出）出口 （31）。

公开(公告)号：EP0350323A3

公开(公告)日：1990-08-16

申请号：EP89306917.9

申请日：1989-07-07

申请人： GEC-MARCONI LIMITED

发明人： Flynn, Stephen John ,  King, Gerard

IPC分类号： H01P1/10

CPC分类号： H01P1/10

摘要： A transmission line switch allows a single output line (3)to be switched to one of two or more input lines (1,2) to which it is permanently connected at a common junction (4). Each input line (1,2) has an associated amplifier stage (10) which can be biased in a normal high gain ('on') state, or in an isolation ('off') state. Suitable biasing in the 'off' state ensures that the amplifier stage output presents a low impedance to its own input line, the length (L) of which is chosen to reflect a high impedance at the junction (4) with the other lines. Correct design enables the return loss and insertion loss of the 'on' path to be kept to low values whilst simultaneously offering a high insertion loss to the 'off' path signals.

公开(公告)号：EP0353864A3

公开(公告)日：1990-08-01

申请号：EP89306648.0

申请日：1989-06-30

申请人： GEC-MARCONI LIMITED

发明人： Gratze, Stephen Cecil

IPC分类号： C03B37/00

CPC分类号： C03B19/12 ,  C03C23/0095 ,  G02B1/00 ,  G02B5/32 ,  G03H1/02 ,  G03H2001/026 ,  G03H2001/0264 ,  G03H2270/53

摘要： Optical elements, particularly holographic elements, are formed by infiltrating into a body of porous sol gel glass a material which can be optically activated. The material is activated in accordance with a predetermined pattern, e.g. by standard holographic techniques or by laser beam writing techniques, to confer upon it the desired optical characteristics, e.g. filter, mirror or lens.

公开(公告)号：EP0371693A1

公开(公告)日：1990-06-06

申请号：EP89312159.0

申请日：1989-11-22

申请人： GEC-MARCONI LIMITED

发明人： Wort, Christopher John ,  Pickering, Kim Louise ,  Pedder, David John

IPC分类号： C23G5/00 ,  B23K1/20

CPC分类号： C23G5/00 ,  B23K1/206 ,  B23K2201/40 ,  H05K3/3489

摘要： A dry solder reflow process, in which metal surface oxides are removed from the solder surface by abstraction of the oxygen from the metal oxide by atomic hydrogen, the atomic hydrogen being created within an intense microwave frequency plasma of a gas containing hydrogen.

摘要翻译： 一种干式焊料回流工艺，其中金属表面氧化物通过原子氢从金属氧化物中抽出氧而从焊料表面上除去，原子氢是在含氢气体的强烈的微波等离子体内产生的。

公开(公告)号：EP0366467A2

公开(公告)日：1990-05-02

申请号：EP89311061.9

申请日：1989-10-26

申请人： GEC-MARCONI LIMITED

发明人： Ellis, Stafford Malcolm

IPC分类号： G02B27/00

CPC分类号： G02B27/0172 ,  A42B3/042 ,  G02B17/045 ,  G02B17/086 ,  G02B27/017 ,  G02B2027/0132 ,  G02B2027/0138 ,  G02B2027/0143

摘要： A helmet supported optical system which provides an eye of a wearer (11 or 49) of a helmet (7 or 35) with a direct view of the scene forward of the wearer (11 or 49) on which is superimposed collimated optical imagery. The system comprises: an eyepiece (1 or 47a, 47b); means (5 or 37a, 37b, 39a, 39b, 41a, 41b, 43a, 43b) operable to develop a bright data representation at a plane (31 or 44a, 44b) substantially congruent with the principal focal plane of an element (21 or 46a, 46b) of the eyepiece (1 or 47a, 47b); and, disposed between the means (5 or 37a, 37b, 39a, 39b, 41a, 41b, 43a, 43b) operable and the eyepiece (1 or 47a, 47b), a body (3 or 45a, 45b) of light refractive material.
The system has a configuration which facilitates improvement in respect of all up weight and/or moments of the system about the helmet wearer's (11 or 49) neck pivot position vis-à-vis known helmet supported optical systems as above which do not include the body (3 or 45a, 45b) of light refractive material disposed between the means operable (5 or 37a, 37b, 39a, 39b, 41a, 41b, 43a, 43b) and the eyepiece (1 or 47a, 47b).

摘要翻译： 一种头盔支撑的光学系统，其提供头盔（7或35）的佩戴者（11或49）的眼睛，其具有直立的穿戴者（11或49）前方的场景，其上叠加有准直光学图像。 该系统包括：目镜（1或47a，47b）; 可操作以在与元件的主焦平面基本一致的平面（31或44a，44b）上形成亮数据表示的装置（5或37a，37b，39a，39b，41a，41b，43a，43b） 目镜（1或47a，47b）的46a，46b）; 并设置在可操作的装置（5或37a，37b，39a，39b，41a，41b，43a，43b）和目镜（1或47a，47b）之间，具有光折射材料的本体（3或45a，45b） 。 该系统具有一种配置，其有助于改进系统围绕头盔佩戴者（11或49）颈部枢转位置的所有重量和/或力矩相对于已知的头盔支撑的光学系统，其不包括 设置在可操作的装置（5或37a，37b，39a，39b，41a，41b，43a，43b）和目镜（1或47a，47b）之间的光折射材料的主体（3或45a，45b）。

公开(公告)号：EP0363209A2

公开(公告)日：1990-04-11

申请号：EP89310228.5

申请日：1989-10-05

申请人： GEC-MARCONI LIMITED

发明人： Gannon, Raymond

IPC分类号： H04N5/33 ,  H04N5/20

CPC分类号： H04N5/33

摘要： Pictorial data from a thermal imager is applied on a line 21 to a RAM 4 at which a histogram representing the numerical distribution of pixel values is produced. This is applied to a microprocessor 9 which uses the histogram to produce a transform to control the gain and offset of the data output of the processor. The microprocessor sets a look-up table 10 to apply the transform to the received data, the output of the table 10 being converted to analogue form at an analogue-to-digital converter 11.

摘要翻译： 来自热成像仪的图形数据被应用到线路21上，其中产生了表示像素值的数值分布的直方图。 这被应用于使用直方图来产生变换以控制处理器的数据输出的增益和偏移的微处理器9。 微处理器设置查找表10以将变换应用于所接收的数据，表10的输出在模拟 - 数字转换器11处被转换为模拟形式。