Abstract:
An optical measuring device for a vehicle includes an optical transmitter that generates transmitter radiation and radiates it into a monitoring region, and a receiver that receives resulting receiver radiation from the region. An evaluation and control unit evaluates the receiver radiation for object recognition. A first transmitter generates a first light field on a surface in the region by emitting directed first transmitter radiation and a second transmitter generates a second light field in the adjacent surroundings of the first field by emitting directed second transmitter radiation. The unit receives and evaluates first receiver radiation reflected by the first field and second receiver radiation reflected by the second field via the receiver, wherein the unit generates an output signal when it detects change in the reflected second receiver radiation caused by a trigger object detected in the region and reflected first receiver radiation unchanged by the object.
Abstract:
An optical measuring device for a vehicle includes an optical transmitter that generates transmitter radiation and radiates it into a monitoring region, and a receiver that receives resulting receiver radiation from the region. An evaluation and control unit evaluates the receiver radiation for object recognition. A first transmitter generates a first light field on a surface in the region by emitting directed first transmitter radiation and a second transmitter generates a second light field in the adjacent surroundings of the first field by emitting directed second transmitter radiation. The unit receives and evaluates first receiver radiation reflected by the first field and second receiver radiation reflected by the second field via the receiver, wherein the unit generates an output signal when it detects change in the reflected second receiver radiation caused by a trigger object detected in the region and reflected first receiver radiation unchanged by the object.
Abstract:
A sensor for locating metal objects has coils or coil parts which form at least one transmitting coil (5.1) and at least one receiving coil (7.1) which are inductively coupled to one another and are arranged such that said coils partially overlap for the purpose of interaction decoupling, wherein optimum cancellation of the interaction can be achieved. Sensor electronics are provided for energizing the transmitting coil and for evaluating a reception signal (10.6) from the receiving coil. As a result of the fact that the transmitting coil (5.1) and the receiving coil (7.1) substantially have an identical coil shape and are arranged such that said coils are rotated and/or offset with respect to one another, wherein a plurality of symmetrically arranged, overlapping regions (8.4) are formed, a sensor which provides a greater range and extended possibilities for installation in conventional industrial sensor housings is provided.
Abstract:
In a method and a sensor device for inductively producing an electrical measuring signal in dependence on a magnitude that is to be measured, there are provided at least two driver coils through which a current is caused to flow in turn at the clock pulse rate of a clock pulse circuit, this current induces a voltage which is dependent on the magnitude that is to be measured in a plurality of coils, the voltage being sub-divided at the clock pulse rate of the clock pulse circuit into voltage signals which are associated with the driver coils, where the voltage signals obtained thereby are evaluated for the purposes of obtaining the measuring signal, where at least two sensor coils are associated with the at least two driver coils, wherein either the sensor coils or the driver coils are connected up in the same sense, whereas the respective other coils are connected up in a mutually opposite sense, and the voltage signals of the sensor coil associated with the driver coils are sampled in certain time periods of the clock pulse signal for the purposes of obtaining the measuring signal.
Abstract:
Disclosed is an arrangement for monitoring changes in an object's surrounding field, including a sensor-active region(s), a measurement path(s) with a driver for applying a variable, a receiver(s) detecting a variable, a circuit connected downstream of the receiver for determining changes in a surrounding field and generating a control and/or measurement signal, a further measurement path(s) or reference section(s) with a driver to detect changes in the variable and the measurement path(s), a clock circuit switched on at time intervals of the measurement path and the reference path a regulating device for the variable(s) introduced by the drivers in response to changes in the variable in the field, with the result that at the receiver average the same amplitude of the variable passes from the drivers and the sensor-active region to the receiver from the measurement paths the sensor-active region being coupled with high resistance to the drivers.
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:
An arrangement serves the purpose of monitoring an object such as a door for changes in a field surrounding the object. A sensor-active region having a measurement area (11a) is associated with the object, and a driver (12, 13) applies a certain variable in the sensor-active region. A receiver (14) detects the variable applied by the drivers and changes in the variable in the field surrounding the object (10) in the sensor-active region (11). By means of a circuit which is connected downstream of the receiver (14), the changes in the field surrounding the object (10) are used to produce a control and/or measurement signal (Δ11a, Δ11b). As a result of the fact that, in order to detect changes in the variable in the field surrounding the object (10), in addition a further measurement path or a reference path with an associated driver (13, 12) is provided, the fact that a clock circuit (15) for switching each of the measurement paths or the measurement path and the reference path on in sections of time is provided, the fact that a regulating device (17) for regulating the at least one variable introduced by the drivers (12, 13) into the measurement paths and/or reference path in response to changes in the variable in the field is provided, with the result that on average the same amplitude of the variable passes from the drivers and the sensor-active region (11) to the receiver (14) at the receiver (14) from each of the measurement paths, and the fact that the sensor-active region (11) is coupled, at a high resistance, at least to the drivers (12, 13), an arrangement for monitoring an object is made more sensitive and at the same time less susceptible to faults.
Abstract:
Optoelectronic device and method for detecting the position and/or movement of an object, the device and method include: a plurality of transmitters for emitting radiation, at least one receiver for receiving the radiation emitted by the transmitters and reflected back by the object or the radiation emitted from transmitters associated with the object, a plurality of mutually different radiation paths, which are formed between at least a part of the transmitters, the object and the receivers or between transmitters associated with the object and the receivers, a timing circuit for cycled switching of the transmitters of the different radiation paths, an evaluation device, which converts the signals received by the receivers for the different radiation paths into values for detection of the position and/or movement of the object along a line or in a surface, wherein for three-dimensional detection of the position and/or movement of the object, the timing circuit switches a plurality of, but at least a part of the transmitters and/or receivers in at least one further cycle such that the space, into which the transmitters emit, is illuminated nearly uniformly, and that the evaluation device determines a value for determination of the distance of the object from the line or surface on the basis of the radiation radiated or radiated back by the object during the further cycle.
Abstract:
In a method and a device for light propagation time measurement, in particular for cameras, a light signal clocked by a clock controller (11) is transmitted from at least one transmitter (12) into a light path (14) via a retroreflective object (O) to a receiver (13) for detecting the alteration of the first light signal on account of the approach, presence and/or distance of the object (O). At the receiver, the received signal is determined from the light path on account of the first light signal and, in order to determine the propagation time, is cyclically compared in a comparator (15) with a second signal which is clocked by the clock controller (11) and which is produced without the light path (14), in order to generate a comparison value at the output of the comparator (15), which value is used for regulating the amplitude values of the transmitted signal and/or of the second signal such that the received signal and the second signal at least at the input of the comparator are substantially identical in magnitude. In parallel, the clock change signal (TW)—occurring during the clock change and corresponding to the light propagation time—between received signal from the light path (14) and second signal, given the magnitude of received signal from the light path (14) and second signal corrected to substantially identical magnitude at the input of the comparator (15), is detected cyclically. A difference value (S16) is determined by comparison of the clock change signals (TW) between received signal and second signal according to their amplitude in a further comparator (16). The difference value (S16) is altered by means of a phase shifter (17) for altering the phase delay of the phase of received signal and second signal until the difference value (S16) becomes minimal, preferably zero. The delay of the phase shifter that occurred given a minimal difference value is used for determining the light propagation time. A method for light propagation time measurement which can also operate with more favourable components and lower-frequency amplifiers is created as a result.
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.