摘要:
Es wird ein optoelektronischer Sensor (10) zur Messung der Entfernung zu einem Objekt in einem Überwachungsbereich (12) angegeben, der einen Lichtsender (20) zum Aussenden von Einzellichtpulsen (22) in den Überwachungsbereich (12), einen Lichtempfänger (26) mit mindestens einer in einem Geiger-Modus betriebenen Lawinenphotodiode zum Empfang der von dem Objekt reflektierten oder remittierten Einzellichtpulse (24), eine Einzellichtlaufzeitmesseinheit (28) zur Bestimmung einer Einzellichtlaufzeit eines Einzellichtpulses (22, 24) als Dauer zwischen einem Sendezeitpunkt des jeweiligen Einzellichtpulses (22) und dessen Empfangszeitpunkt an der Lawinenphotodiode sowie eine Auswertungseinheit (30, 32) aufweist, die dafür ausgebildet ist, aus einer Vielzahl von Einzellichtlaufzeiten einen gemeinsamen Messwert für die Entfernung zu bestimmen sowie abzuschätzen, wie viele Einzellichtlaufzeiten aufgrund von Hintergrundereignissen in einem Zeitintervall zu erwarten sind, wobei eine exponentiell abfallende Häufigkeit von Hintergrundereignissen angenommen ist, und den gemeinsamen Messwert aus einem Zeitintervall zu bestimmen, in dem signifikant mehr Einzellichtlaufzeiten liegen als erwartet.
摘要:
In a laser range finder (110), each reflected light reflected by at least one object of pulsed laser light emitted by a light emitting element (112) reaches a light receiving element (118), and distance information to the at least one object is acquired based on an amount of time from a light emission starting time for the pulsed laser light to an output starting time from the light receiving element (118). An erroneous detection reducing circuit (10) for the laser range finder (110) includes: a comparator (CMP) receiving as inputs a threshold and a light-reception output from the light receiving element (118); a time measuring section (20a) measuring time elapsed since the light emission starting time for the pulsed laser light; and a setting changing section (20b) changing either one or both of the threshold and an amplification factor of the comparator (CMP) for the light-reception output in accordance with a time measurement value obtained by the time measuring section (20a).
摘要:
The invention provides use of one or more emitted beams of radiation (16), for example, laser beam(s), in combination with an image capturing means (14), for example, one or more video cameras and/or optical elements to detect particles (30), for example, smoke particles, located in an open space (12).
摘要:
The invention provides use of one or more emitted beams of radiation (16), for example, laser beam(s), in combination with an image capturing means (14), for example, one or more video cameras and/or optical elements to detect particles (30), for example, smoke particles, located in an open space (12).
摘要:
Es wird ein Verfahren zur Vermessung eines Objekts mittels zumindest eines ersten Laserscanners beschrieben, welcher für eine Vielzahl von Messpunkten Messwerte erfasst, wobei zur Vermessung des Objekts nur Messwerte verwendet werden, die über einem vorbestimmten Schwellenwert liegen. Das Verfahren zeichnet sich dadurch aus, dass für zumindest zwei Bereiche von Messpunkten des Laserscanners oder der Laserscanner Schwellenwerte separat ermittelt werden und der für einen Messpunkt verwendete Schwellenwert in Abhängigkeit eines Gütemaßes ausgewählt wird.
摘要:
The invention relates to an optoelectronic detection device (7), in particular a laser scanner, for a motor vehicle, comprising an optical transmitter for transmitting magnetic beams, an avalanche photo detector (10) for capturing beams reflected by a target object in the surrounding area of the motor vehicle and for providing an electric capturing signal (11) in accordance with the captured beams, also comprising an evaluation device (12) for detecting the target object in accordance with the electric capturing signal (11), and a control device (17) which is designed to adjust an electric bias voltage (BU) of the avalanche photo detector (10) when said detection device (7) is in operation. Said detection device (7) comprises a measuring device for recording the value of the noise (R) of the electric capturing signal (11), and the control device (17) is designed to adjust the bias voltage (BU) of the avalanche photo detector (10) in accordance with the value of the noise (R).
摘要:
The present invention aims to provide a distance measuring apparatus which can achieve reduction in cost and size and perform measurement ranging from short-distance to long-distance accurately. For this purpose, the distance measuring apparatus of the present invention includes an unit (11 to 13) outputting first pulsed light L1 to a measurement object, an unit (16, 17) detecting first pulsed light L2 reflected by the measurement object to output a signal responsive to an intensity variation thereof, a measuring unit (18, 20) measuring a time difference between output and detection of the first pulsed light during a period when an intensity of the signal is larger than a predetermined value, a measuring unit (18, 21) measuring the time difference at a time when an intensity of the signal varies from less than a predetermined value to the predetermined value or more, and an unit (24, 25) calculating a distance to the measurement object using a time difference measured by at least one of the two measuring units.
摘要:
The invention provides use of one or more emitted beams of radiation (16), for example, laser beam(s), in combination with an image capturing means (14), for example, one or more video cameras and/or optical elements to detect particles (30), for example, smoke particles, located in an open space (12).