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:
A LASER rangefinder (2) comprising an emitter stage (4) to emit LASER pulses, a receiver stage (5) to generate electrical distance signals (SD) based on the LASER pulses received, an optical splitter (7) and a processing unit able to: sample each electrical distance signal (SDi) to determine a first vector (PV) containing first sample values (pvi); filter the first vector (PV), through a digital low-pass filter, to determine a second vector (SV) containing second sample values (svi); determine a third vector (TV) containing third sample values (tvi) determined by subtracting the second sample values (svi) from the corresponding first sample values (pvi); calculate a standard deviation (σ) on the basis of the third sample values (tvi); calculate a plurality of detection thresholds (SR(i)) based on the standard deviation (σ), the second sample values (svi) and a predetermined coefficient (oi(i)); compare each first sample value (pvi) with a corresponding detection threshold (SR(i)); and calculate the target distance (D) based on the result of the comparison.
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:
Die Erfindung betrifft ein Verfahren zur Entfernungsmessung durch Bestimmen der Pulslaufzeit, bei dem mit wenigstens einem Sender gepulste elektromagnetische Strahlung ausgesandt wird und an Objekten reflektierte Signalpulse mit wenigstens einem Empfänger nachgewiesen werden, wobei aus dem die Signalpulse enthaltenden analogen Empfangssignal, insbesondere mittels einer Schwellenschaltung, zumindest ein logische Signale enthaltendes logisches Empfangssignal erzeugt und hinsichtlich der Laufzeiten der logischen Signale ausgewertet wird, und wobei das logische Empfangssignal mittels einer getakteten Dateneinleseeinrichtung in eine programmierbare Logikschaltung eingelesen und in der Logikschaltung auf ein Zeitraster abgebildet wird, indem für wenigstens einem Takt der Dateneinleseeinrichtung entsprechende Zeitfenster des Zeitrasters Momentanwerte des logischen Empfangssignals in den Zeitfenstern zugeordneten Logikeinheiten der Logikfreischaltung festgehalten werden. Die Erfindung betrifft außerdem eine Vorrichtung zur Entfernungsmessung.
摘要:
The present invention relates to a light-wave rangefinder using a pulse method, which can reduce a measurement error, in which a tuned amplifier converts an electric signal of a light receiving unit into a damped oscillation waveform and thereby an arithmetic processing means can calculate a distance from a measuring position to a reflecting object on the basis of the damped oscillation waveform of the tuned amplifier. An optical noise sampling unit samples an optical noise produced in the rangefinder; an optical-noise storage unit stores sampling data of the optical-noise sampling unit; an arithmetic processing means reduces a measurement error caused by an optical noise on the basis of the sampling data of the optical-noise storage unit; and thereby a distance, a measurement error of which is reduced, can be calculated.