Abstract:
A sensor for the location of metallic objects and also an associated method comprise a plurality of transmitting coils (2.1, 2.2) and at least one receiving coil (1.9) which are arranged such as to be inductively coupled to one another and overlap to a partial extent for the purposes of decoupling the interaction therebetween, whereby there can be obtained a point of optimal cancellation of the interaction. Due to the fact that a flow of current is passed through the transmitting coils (2.1, 2.2) by a sensor electronic system, equal flows of current through the transmitting coils have an effect upon the at least one receiving coil (1.9) which results in a local point of optimal cancellation which moves in a first direction when there is a flow of current in a first transmitting coil (2.1), whereas it moves in another direction when there is a flow of current in a further transmitting coil (2.2), and due to the fact that there is provided a control circuit for the regulation of the currents in the transmitting coils which leads to a displacement of the local point of optimal cancellation which causes cancellation of the received signal, a simple and effective sensor is thereby produced.
Abstract:
Disclosed is a method and a device for light propagation time measurement, wherein a light signal is transmitted from at least one transmitter into a light path via a retroreflective object to a receiver for detecting the alteration of the first signal, presence, and/or distance of the object, the received signal being determined from the path and compared with a second signal produced without the light path to achieve a comparison value, which regulates amplitude values of the transmitted signal and/or of the second signal, a clock change signal corresponding to the light propagation time between received signal and second signal is detected cyclically, a difference value being determined by comparing change signals between received signal and second signal , the difference value being altered by means of a phase shifter , delay of the phase shifter that occurred given a minimal difference value determining the light propagation time.
Abstract:
The invention relates to a method for determining and/or evaluating a differential, optical signal. According to the invention, at least two first light sources (S1, S2) which are sequentially clocked in terms of light and emitted in a phased manner are provided, in addition to at least one receiver (E) which is used to receive at least the alternating light portion arising from the first light sources (S1, S2). The light intensity radiating through at least one light source (S1, S2) in the measuring arrangement is controlled in such a manner that the clock synchronous alternating light portion, which occurs between different phases, is zero in the receiver (E). By determining the reception signal in the receiver (E) in relation to the phase position in order to regulate the radiated light intensity and by producing an adjustable variable (R) directly or by adding current in the receiver, it is possible to simplify digital implementation of the method with as little sensitivity loss as possible.
Abstract:
The invention relates to a device and a method for identifying an object O in an opening that can be closed by means of a mobile element (12). Light is fed into at least one fibre-optic light guide (33, 34) from a light source (1, 2), and variations in the received light are detected by means of at least one receiver (Ea, Eb), the fibre-optic light guide being arranged at least partially along the edge of the opening (11). A first fibre-optic light guide sends light transversally to the length thereof, said light being then received by a second fibre-optic light guide transversally to the length thereof. The second fibre-optic light guide (34) is connected to the receiver (Eb). The fibre-optic light guides are arranged on the edge of the opening (11) in such a way that a light field (F) at least partially bridging the opening is produced. At least one light source (1, 2) and at least one receiver (Ea, Eb) are respectively associated with each fibre-optic light guide (33, 34), and a clock circuit is used to alternately feed the light received by the respective receiver into the fibre-optic light guides. Comparison means are used to compare the signals on the receivers in order to identify the object.
Abstract:
A device for detecting the wetting and/or soiling of a windscreen surface, in particular in a vehicle, comprises a camera with a sensor having a plurality of light-sensitive pixels arranged as an array and adapted to be illuminated according to an illumination cycle, and having a focussing optic for a camera focus set to almost infinite. The device is further provided with a light source for illuminating a detection portion of the screen surface detectable by the camera. The light source may be switched on and off according to a predeterminable ON/OFF cycle. The ON/OFF cycle is synchronized to the illumination cycle of the camera sensor, and the wetting/soiling of the screen surface may be detected by comparing the image information from the sensor of the camera when the light source is turned on and when the light source is turned off.
Abstract translation:用于检测挡风玻璃表面(特别是车辆)的润湿和/或污染的装置包括具有传感器的相机,所述传感器具有排列成阵列并适合于根据照明周期照明的多个感光像素, 并且具有将相机焦点设置为几乎无限的聚焦光学元件。 该装置还设置有用于照亮由相机可检测的屏幕表面的检测部分的光源。 可以根据可预定的开/关循环来打开和关闭光源。 ON / OFF周期与摄像机传感器的照明周期同步,并且可以通过比较当光源被接通时相机的传感器的图像信息和当光源被打开时,可以检测屏幕表面的润湿/污染 来源被关闭。
Abstract:
“A control device or a method monitors access of at least one body or one person to an access area, the device comprising at least one emitting element that emits light radiation into the access area, at least one receiving element that receives the light radiation, and at least one means which generates a diffused light field that emits the light radiation, which is emitted into the access area, in the form of a planar light field, where on the receive side, a detection element for the diffused detection of the light field and a transferring means for transferring the light detected in a diffused manner to the receiving element are provided.”
Abstract:
A control arrangement for a control element for opening and closing a hatch in a motor vehicle has a motorized vehicle panel. The control element is designed in such a way that, upon a short actuation of the control element, depending on the direction of actuation of the control element, a control unit outputs a signal to a motor in order to displace the vehicle panel, and the vehicle panel is displaced in response to the signal. A safety operating device for the arrangement has at least one light transmission section which is actuated upon actuation of the control element and which correspondingly outputs an activation confirmation signal to a control unit. The control unit will not output a signal in response to which the motor displaces the vehicle panel until the signal from the control element and the activation confirmation signal from the safety operating device are present at the same time.
Abstract:
The invention relates to a device and a method for optoelectronically identifying the displacement and/or position of an object. According to the method, a transmitter element emits light, which is received by at least one receiver element and the light emitted from the transmitter element is scattered by an object, wherein an optical guide is provided between the transmitter element and the receiver element. This aim of the invention is to fulfill the prerequisites for a key construction, which can be operated below a sealed surface. To achieve this, the optical guide includes light coupling means for coupling in the illumination that has been scattered by the object and previously emitted by the optical guide.
Abstract:
Inserted in the transmission path (10) for transmitting a color signal of a color television signal is a signal switcher (12) with at least three switch positions (12a, 12b, 12c), the end positions of which are connected to the output (11.2) and input (11.1), respectively, of a delay line (11) contained in the transmission path. Connected to the transmission path (8) of the luminance signals is an edge detection arrangement (24) which, when a signal edge is detected in the luminance signal, generates a detection signal that oscillates about a zero line and has a zero crossing at the detection time, and controls the signal switcher in such a way that an associated color signal edge of the color signal, which has a steep slope and occurs at the point in time of the signal edge of the luminance signal, is transmitted. In the absence of detection of a signal edge, portions of both the undelayed and the delayed color signal are transmitted to the signal output (12.3) of the signal switcher.