DE10228677A1 - Laser distance measurement device couples light signal out for reference measurements before entry of light signal into measurement channel using controlled reflection at optical boundary surface - Google Patents
Laser distance measurement device couples light signal out for reference measurements before entry of light signal into measurement channel using controlled reflection at optical boundary surface Download PDFInfo
- Publication number
- DE10228677A1 DE10228677A1 DE2002128677 DE10228677A DE10228677A1 DE 10228677 A1 DE10228677 A1 DE 10228677A1 DE 2002128677 DE2002128677 DE 2002128677 DE 10228677 A DE10228677 A DE 10228677A DE 10228677 A1 DE10228677 A1 DE 10228677A1
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- Germany
- Prior art keywords
- light signal
- measurement
- light
- laser distance
- measuring device
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- 238000005259 measurement Methods 0.000 title claims abstract description 34
- 230000003287 optical effect Effects 0.000 title claims abstract description 20
- 230000005693 optoelectronics Effects 0.000 claims abstract description 11
- 238000011156 evaluation Methods 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000011247 coating layer Substances 0.000 claims description 2
- 230000005855 radiation Effects 0.000 claims 2
- 230000007704 transition Effects 0.000 abstract 1
- 230000010363 phase shift Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
- G01S7/4813—Housing arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
- G01S7/4812—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver transmitted and received beams following a coaxial path
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/497—Means for monitoring or calibrating
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
Description
Die Erfindung betrifft eine Laserabstandsmesseinrichtung zur Ermittlung eines Objektabstand auf Basis der Lichtlaufzeitmessung. Bei diesen Laserabstandsmesseinrichtungen werden von einem Lichtsender Lichtsignale in Richtung eines Objektes ausgesandt, welche beim Auftreffen auf ein Objekt daran reflektiert und anschließend von einem optoelektronischen Empfänger erkannt werden. Die empfangenen Lichtsignale werden in ein elektrisches Empfangslichtsignal umgewandelt und einer Auswerteschaltung zugeleitet.The invention relates to a laser distance measuring device to determine an object distance based on the time-of-flight measurement. These laser distance measuring devices are made by a light transmitter Light signals emitted towards an object, which when Hitting an object reflected on it and then by an optoelectronic receiver be recognized. The received light signals are converted into an electrical received light signal converted and fed to an evaluation circuit.
Eine Laserabstandsmesseinrichtung
dieser Art ist beispielsweise aus der
Neben diesen Laserabstandsmesseinrichtungen auf Basis der Lichtimpulslaufzeit sind auch Laserabstandsmesseinrichtungen bekannt, bei denen kontinuierlich modulierte Lichtsignale in Richtung eines Objektes ausgesandt werden und nach Reflexion am Objekt vom optoelektronischen Empfänger erkannt werden. In diesen Fällen wird das modulierte Empfangssignal aufgrund der Lichtlaufzeit eine Phasenverschiebung erfahren. Aus dem Betrag der Phasenverschiebung kann ebenfalls der Objektabstand ermittelt werden. Auch hierbei ist es für die genaue Abstandsermittlung notwendig, dass die zu messende lichtlaufzeitbedingte Phasenverschiebung nicht durch z. B. temperaturabhängige Phasenverschiebungen im System überlagert wird.In addition to these laser distance measuring devices Laser distance measuring devices are also based on the light pulse transit time known in which continuously modulated light signals in the direction of a Object are sent out and after reflection on the object from the optoelectronic Recipient recognized become. In these cases the modulated received signal is a due to the light propagation time Experience phase shift. From the amount of the phase shift the object distance can also be determined. Here too is it for the exact determination of the distance required that the light propagation time to be measured Phase shift not by z. B. temperature-dependent phase shifts overlaid in the system becomes.
In der
Nachteilig am bekannten Stand der Technik ist, dass ein optischer und mechanischer Aufwand notwendig ist, um vor dem Eintritt der Lichtsignale in den Messkanal ein Lichtsignalanteil zur Referenzmessung abzuspalten und diesen unbeeinflusst von sämtlichen äußeren Einflüssen direkt dem Referenzempfänger zuzuleiten. Ebenfalls ist als nachteilig bekannt, dass zur Referenzmessung nur ein geometrischer Streulichtanteil des Lichtsenders herangezogen wird, welcher nicht in allen Betriebsbedingungen mit den Lichtsignalen übereinstimmt, die in den Messkanal eingespeist werden und deshalb nur bedingt zur Referenzmessung geeignet sind.A disadvantage of the known state of the Technology is that an optical and mechanical effort is necessary is a portion of the light signal before the light signals enter the measuring channel split off for reference measurement and this unaffected by all external influences directly the reference recipient be forwarded. It is also known to be disadvantageous that for reference measurement only a geometrical scattered light component of the light transmitter is used which does not match the light signals in all operating conditions, which are fed into the measuring channel and therefore only to a limited extent are suitable for reference measurement.
Der Erfindung liegt die Aufgabe zu Grunde, bei einer Laserabstandsmesseinrichtung der eingangs genannten Gattung, auf möglichst einfache und kostengünstige Art und Weise, vor dem Eintritt der Lichtsignale in den Messkanal einen Lichtsignalanteil zur Referenzmessung abzuspalten, der in allen Betriebszuständen ein optisch und geometrisch repräsentatives Referenzsignal liefert. Darüber hinaus ist es eine Aufgabe der Erfindung, den abgespaltenen Lichtsignalanteil einem Referenzempfänger zuzuleiten, der den gleichen Betriebs- und Umweltbedingungen, wie der Messempfänger, ausgesetzt ist.The invention is based on the object Reason, in a laser distance measuring device of the aforementioned Genus, if possible simple and inexpensive Way, before the light signals enter the measuring channel split off a light signal component for reference measurement, which in all operating conditions a visually and geometrically representative Provides reference signal. About that In addition, it is an object of the invention, the split light signal component a reference recipient the same operating and environmental conditions as the measuring receiver, is exposed.
Gemäß der Erfindung wird die Aufgabe dadurch gelöst, dass vor dem Eintritt der Lichtsignale in den Messkanal, mittels einer gerichteten Rückreflexion an einer optischen Grenzfläche, ein Lichtsignalanteil zur Referenzmessung ausgekoppelt und dem Referenzempfänger, der sich in unmittelbarer Nähe zum Messempfänger befindet, zugeführt wird.According to the invention the object solved by that before the light signals enter the measuring channel, by means of a directed back reflection at an optical interface, a light signal component for reference measurement and the reference receiver, which yourself in the immediate vicinity to the measuring receiver located, fed becomes.
Ein wesentlicher Vorteil dieser erfindungsgemäßen Auskopplung des Referenzsignales mittels einer gerichteten Rückreflexion an einer optischen Grenzfläche besteht darin, dass der abgespaltene Anteil das gleiche geometrische Strahlquerschnittsprofil aufweist, wie das Strahlquerschnittsprofil, das in den Messkanal eingespeist wird.A major advantage of this decoupling according to the invention of the reference signal by means of a directed back reflection at an optical interface in that the part split off has the same geometric beam cross-sectional profile has, like the beam cross-sectional profile that in the measuring channel is fed.
Nach der Auskopplung kann das Referenzsignal über einen flexiblen Wellenleiter, über einen oder mehrere Umlenkspiegel, als auch über einen starren Lichtleiter mit einer oder mehreren Totalreflexionsflächen, dem Referenzempfänger zugeführt werden.After decoupling, the reference signal can be transmitted via a flexible waveguide, over one or more deflecting mirrors, as well as via a rigid light guide with one or more total reflection surfaces, are fed to the reference receiver.
Von besonderem Vorteil nach der Erfindung ist, dass über eine optische Vergütungsschicht auf der die Rückreflexion erzeugenden Grenzfläche, der Reflektionsanteil sehr gut in seiner Amplitude anpassbar ist. Dadurch kann die Lichtsignalleistung auf dem Referenzempfänger so beeinflusst werden, dass sie zumindest in der gleichen Größenordnung ist, wie die Lichtsignalleistung, die über die Reflexion am Objekt verursacht wird und danach auf dem Messempfänger anliegt.Of particular advantage according to the invention is that about an optical coating layer on which the back reflection generating interface, the amplitude of the reflection portion can be adjusted very well. This allows the light signal power on the reference receiver be influenced that it is at least of the same order of magnitude, like the light signal power, which is due to the reflection on the object is caused and then lies on the measuring receiver.
Die gerichtete Rückreflexion zur Auskopplung bietet darüber hinaus noch den Vorteil, dass alle nicht zur Referenzmessung beitragenden optischen Grenzflächen geometrisch so dimensioniert werden können, dass die daran entstehenden ungewollten Rückreflexionen bzw. Rückstreuungen nicht in den optischen Referenzpfad eintreten, bzw. in einem optischen Sumpf eliminiert werden können. Durch die Ausnutzung der gerichteten Rückreflexion mit anschließender optischer Lichtführung können in vorteilhafter Weise die optoelektronischen Empfänger zum Empfang des Mess- und des Referenzlichtsignal geometrisch in unmittelbarer Nähe angeordnet werden, so dass sie weitgehend den gleichen Umgebungsbedingungen ausgesetzt sind und dadurch eine optimale Kompensation der internen Laufzeiten ermöglichen. Die räumliche Nähe der optoelektronischen Empfänger zum Empfang der Mess- und der Referenzlichtsignale ermöglicht auch, dass alle erforderlichen elektrischen Bauelemente auf einer gemeinsamen Leiterplatte vereinigt werden können, wodurch eine kompakte Bauform und damit eine wirtschaftliche Herstellbarkeit der Laserabstandsmesseinrichtung möglich ist.The directed back reflection for decoupling also has the advantage that all optical interfaces that do not contribute to the reference measurement can be geometrically dimensioned in such a way that the unwanted ones that result Back reflections or back scattering cannot enter the optical reference path or can be eliminated in an optical sump. By utilizing the directed back reflection with subsequent optical light guidance, the optoelectronic receivers for receiving the measurement and reference light signals can advantageously be arranged geometrically in the immediate vicinity, so that they are largely exposed to the same environmental conditions and thus enable optimal compensation of the internal runtimes , The spatial proximity of the optoelectronic receivers for receiving the measurement and reference light signals also makes it possible for all the necessary electrical components to be combined on a common printed circuit board, as a result of which a compact design and thus economic feasibility of the laser distance measuring device is possible.
Die Erfindung wird im Folgenden beispielhaft unter
Bezugnahme auf die Zeichnung beschrieben, deren einzige
Die erfindungsgemäße Laserabstandsmesseinrichtung
umfasst einen Lichtsender
Wenn die in den Messkanal eintretenden Lichtimpulse
auf ein Objekt auftreffen, werden die daran rückgestreuten Lichtimpulse von
der Empfangslinse
Beim Eintritt der vom Lichtsender
Claims (10)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2002128677 DE10228677A1 (en) | 2002-06-27 | 2002-06-27 | Laser distance measurement device couples light signal out for reference measurements before entry of light signal into measurement channel using controlled reflection at optical boundary surface |
| DE20220710U DE20220710U1 (en) | 2002-06-27 | 2002-06-27 | Laser distance measurement device couples light signal out for reference measurements before entry of light signal into measurement channel using controlled reflection at optical boundary surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2002128677 DE10228677A1 (en) | 2002-06-27 | 2002-06-27 | Laser distance measurement device couples light signal out for reference measurements before entry of light signal into measurement channel using controlled reflection at optical boundary surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE10228677A1 true DE10228677A1 (en) | 2004-01-22 |
Family
ID=29761467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2002128677 Withdrawn DE10228677A1 (en) | 2002-06-27 | 2002-06-27 | Laser distance measurement device couples light signal out for reference measurements before entry of light signal into measurement channel using controlled reflection at optical boundary surface |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE10228677A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010041390A1 (en) * | 2010-07-28 | 2012-02-02 | Ifm Electronic Gmbh | Time-of-flight camera with signal monitoring |
| WO2013079331A1 (en) * | 2011-11-29 | 2013-06-06 | Valeo Schalter Und Sensoren Gmbh | Optical measuring device |
| CN111239707A (en) * | 2018-11-28 | 2020-06-05 | 湖北华中光电科技有限公司 | An eye-safe dual-wave gate laser detection device |
| EP3798686B1 (en) | 2019-09-27 | 2022-04-06 | Sick Ag | Optoelectronic sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3429062C2 (en) * | 1984-08-07 | 1988-10-06 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch, De | |
| DE10014125A1 (en) * | 2000-03-22 | 2001-09-27 | Adc Automotive Dist Control | Optical system performs at least one reference measurement as transition time measurement for optical signal in two reference light conductors to determine distance measurement correction |
| DE10027239A1 (en) * | 2000-05-31 | 2001-12-06 | Sick Ag | Distance measuring method and distance measuring device |
| DE10041182A1 (en) * | 2000-08-23 | 2002-03-14 | Leuze Lumiflex Gmbh & Co | Optoelectronic system has optical fiber reference object feeding transmitted light pulses to receiver as reference pulses whose transition times are measured as reference measurement |
-
2002
- 2002-06-27 DE DE2002128677 patent/DE10228677A1/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3429062C2 (en) * | 1984-08-07 | 1988-10-06 | Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch, De | |
| DE10014125A1 (en) * | 2000-03-22 | 2001-09-27 | Adc Automotive Dist Control | Optical system performs at least one reference measurement as transition time measurement for optical signal in two reference light conductors to determine distance measurement correction |
| DE10027239A1 (en) * | 2000-05-31 | 2001-12-06 | Sick Ag | Distance measuring method and distance measuring device |
| DE10041182A1 (en) * | 2000-08-23 | 2002-03-14 | Leuze Lumiflex Gmbh & Co | Optoelectronic system has optical fiber reference object feeding transmitted light pulses to receiver as reference pulses whose transition times are measured as reference measurement |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010041390A1 (en) * | 2010-07-28 | 2012-02-02 | Ifm Electronic Gmbh | Time-of-flight camera with signal monitoring |
| US9462168B2 (en) | 2010-07-28 | 2016-10-04 | Ifm Electronic Gmbh | Light propagation time camera system having signal path monitoring |
| DE102010041390B4 (en) * | 2010-07-28 | 2017-12-07 | pmdtechnologies ag | Time of flight camera with signal path monitoring |
| WO2013079331A1 (en) * | 2011-11-29 | 2013-06-06 | Valeo Schalter Und Sensoren Gmbh | Optical measuring device |
| CN104081221A (en) * | 2011-11-29 | 2014-10-01 | 法雷奥开关和传感器有限责任公司 | Optical measuring device |
| US9239260B2 (en) | 2011-11-29 | 2016-01-19 | Valeo Schalter Und Sensoren Gmbh | Optical measuring device |
| CN111239707A (en) * | 2018-11-28 | 2020-06-05 | 湖北华中光电科技有限公司 | An eye-safe dual-wave gate laser detection device |
| EP3798686B1 (en) | 2019-09-27 | 2022-04-06 | Sick Ag | Optoelectronic sensor |
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| Date | Code | Title | Description |
|---|---|---|---|
| OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
| 8139 | Disposal/non-payment of the annual fee |