Abstract:
The general field of the invention is that of optical devices for detecting the position/orientation of a helmet. The device according to the invention comprises an optional stationary light source, a stationary camera associated with an image processing system, and a helmet. The helmet has a scattering coating and includes at least one set of markers, each marker comprising at least a first optical element having a very low reflection coefficient, a very low scattering coefficient and a very high absorption coefficient in the visible range and in that of the light source. In one embodiment, each marker may also include a first optical element having a very high retroreflection coefficient and a very low scattering coefficient in the visible range. The marker may also include a second optical element having a high scattering or phosphorescence coefficient in the emission range of the light source.
Abstract:
A device determining the orientation of a first solid body with respect to a second or reference solid body. Each body is filled with sets consisting of an optical source and a detector of optical radiation, so as to define at least two straight lines having a direction u and v joining two pairs of sources (S.sub.mi, S.sub.fj), the sources (S.sub.mi) relating to the first solid body and the sources (S.sub.fj) relating to the reference solid body. The device includes means to compute the parameters of orientation of the first solid body with respect to the reference solid body from the coordinates of the vectors u and v. Applications: Determining the orientation of a helmet of the pilot of an aircraft or helicopter with respect to a cockpit.
Abstract translation:确定第一固体相对于第二或参考固体的取向的装置。 每个身体填充有由光源和光学辐射检测器组成的组,以便限定具有方向+ E,rar u + EE和+ E的至少两条直线,rar v + EE连接两对源 (Smi,Sfj),与第一固体相关的源(Smi)和与参考固体相关的源(Sfj)。 该装置包括从矢量+ E,rar u + EE和+ E,rar v + EE的坐标计算相对于参考实体的第一固体的取向参数的装置。 应用:确定飞机或直升机飞行员头盔相对于驾驶舱的方位。
Abstract:
An instrument system to make settings and verify that the pupil of an eye of a wearer of a helmet designed to receive a piece of optoelectronic equipment itself having a pupil truly coincides with the wearer's pupil, wherein the instrument system includes first and second optical devices whose position with respect to the helmet is fixed, and a first screen and a second screen E.sub.1 and E.sub.2, each including a reference-marking test pattern, the position of the helmet with respect to the wearer being accurate only if the image of the wearer's eye through the first optical means and the image through the second optical means, of a target on which the wearer's line of view is fixed, are respectively well-positioned with respect to the test patterns of the screens E.sub.1 and E.sub.2. In the preferred embodiment, the screens E.sub.1 and E.sub.2 are merged into a single screen E through an optical device partially common to the first and second optical devices.
Abstract:
The modulation by optical valves of three beam coming from a main or auxiliary primary beam of depolarized and collimated white light is achieved by means of two secondary beams of white light that are linearly polarized and perpendicular to each other. The undesirable color components are suppressed to constitute the three constituent color beams of the color image. Through the invention, the geometrical and spectral quality of the image is independent of the main or auxiliary primary beam and the image is as powerful as the one obtained by the standard method of projection. The auxiliary image can be used as a back-up or can be adapted to night-time projection.
Abstract:
A method and apparatus for diminishing flicker of a liquid crystal display (LCD) by producing a variable temporal modulation of the fluorescent tubes providing rear illumination of the LCD matrix panel. Fluorescent tubes are placed in a sequence behind the panel, parallel to lines of pixels of the panel. A high frequency supply of each tube is modulated by a low frequency periodic pulse control signal, the chopping rate of which is modulated. The modulation in the chopping rate of each low frequency periodic pulse control signal is determined by corresponding control signal. The control signals, delivered by a generator, are T/M phase shifted between two consecutive control signals, T being the image refreshing period and M the number of tubes. The control signals are individually adjusted to cause a rear illumination substantially in phase opposition with a means optical transmission of a zone of pixels facing each tube.
Abstract:
The field of the invention is that of optical systems for detecting the posture of a mobile object in space. The system comprises an electro-optical fixed device of known orientation comprising a first point emission source, a telecentric emission/reception optic and a photosensitive matrix sensor. An assembly comprising an optical cubic wedge is disposed on the mobile object. The input face of the cubic wedge comprises a mask in the shape of a parallelogram, each side of the parallelogram comprising a geometric marking making it possible to identify it, the image of the mask projected on the photosensitive matrix sensor, by reflection on the faces of the cubic wedge, being the intersection of the projection of the mask and of the projection of its image inverted with respect to the centeR of the cubic wedge. Analysis of this image makes it possible to determine the orientation of the cubic wedge.
Abstract:
The general field of the invention is that of optical systems for detection of the orientation of mobile objects in space. The main application is helmet posture detection inside of an aircraft cockpit. The system according to the invention operates by interferometry. It comprises a fixed electro-optical device comprising one or more collimated point-like emission sources and a detection assembly comprising one or more point-like photosensitive detectors. Two or more retro-reflecting devices referred to as “cube corner” are disposed on the mobile object. This system can be completed by optical means operating in polarized light mode allowing the direction of variation of the interference fringes to be determined and by other optical devices allowing an initial orientation to be measured.
Abstract:
The balancing device includes static weights, equally distributed by mass in two housings elongated along the span of the blade, and dynamic weights distributed by mass in the two housings so as to ensure the dynamic adjustment of the blade while keeping the preestablished static adjustment, the weights being introduced into the housings and extracted from these latter through a single opening emerging simultaneously in the internal end, towards the blade root, of the two housings symmetrical relative to the pitch centring axis of the blade. This single access opening is able to be closed by a door opening in the extrados or intrados surface of the blade.
Abstract:
The invention concerns a system for the management of an interaction system between a man (41) and a machine (12). Data input into the system are output by interaction devices (1, 2, 3, 4) from the man to the machine. At least two functions (7, 8, 9, 10) operate simultaneously on data (24, 25, 26), data input into the system being processed by a first function (7), the result of one function forming input data for the next function. The result of the last function (10) is output to interaction devices (11) from the system to the man. Functions are synchronized with each other by an exchange protocol.
Abstract:
The overall field of the invention is that of systems for detecting the posture of a moving object in space. The device according to the invention comprises: a fixed electrooptical device comprising a point emission source, a telecentric lens comprising a projection lens, a reception lens and a semireflective optical element and a photosensitive matrix-type sensor, the point emission source being arranged at the common focal point of the projection lens and of the reception lens by reflection or transmission through the semireflective optical element, and; an assembly comprising at least three corner cube retroreflectors which are arranged on the moving object. The main application of this device is the detection of the orientation of an aircraft pilot helmet.