DE19741887B4 - Device for transit time measurement of light - Google Patents

Device for transit time measurement of light Download PDF

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Publication number
DE19741887B4
DE19741887B4 DE19741887A DE19741887A DE19741887B4 DE 19741887 B4 DE19741887 B4 DE 19741887B4 DE 19741887 A DE19741887 A DE 19741887A DE 19741887 A DE19741887 A DE 19741887A DE 19741887 B4 DE19741887 B4 DE 19741887B4
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light
light beam
dark
laser diode
emitting device
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Expired - Fee Related
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DE19741887A
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DE19741887A1 (en
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Peter Brockhaus
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    • 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
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • 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
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
    • G01S17/14—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves wherein a voltage or current pulse is initiated and terminated in accordance with the pulse transmission and echo reception respectively, e.g. using counters
    • 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
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/74—Systems using reradiation of electromagnetic waves other than radio waves, e.g. IFF, i.e. identification of friend or foe

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

Vorrichtung zur Laufzeitmessung von Licht in transparenten Medien mit einer Licht emittierenden Einrichtung zum Erzeugen eines Lichtstrahls, einer Lichtempfangseinrichtung zum Empfangen eines reflektierten Lichtstrahls von einem Reflexionselement, der aus dem von der Licht emittierenden Einrichtung erzeugten Lichtstrahl resultiert,
dadurch gekennzeichnet,
dass die Licht emittierende Einrichtung zum Erzeugen eines Lichtstrahls eine Laserdiode ist, die Dauerlicht aussendet, das von zeitlich kurzen Dunkelimpulsen, die wesentlich kürzer als die Lichtphase des Lichtstrahls zwischen zwei Dunkelimpulsen sind, unterbrochen ist,
dass die Laserdiode jedes Mal ein Start-Signal an ein Zeitmessgerät übermittelt, wenn der kurze Dunkelimpuls des von der Laserdiode emittierten Lichtstrahls beginnt,
und die Lichtempfangseinrichtung ein Stopp-Signal an das Zeitmessgerät übermittelt, wenn die Lichtempfangseinrichtung einen hell/dunkel Übergang des empfangenen Lichtstrahls detektiert.Apparatus for measuring transit time of light in transparent media with a light-emitting device for generating a light beam, a light-receiving device for receiving a reflected light beam from a reflection element that results from the light beam generated by the light-emitting device,
characterized,
in that the light-emitting device for producing a light beam is a laser diode which emits continuous light which is interrupted by chronologically short dark pulses, which are substantially shorter than the light phase of the light beam between two dark pulses,
the laser diode transmits a start signal to a timepiece each time the short dark pulse of the light beam emitted by the laser diode begins,
and the light receiving device transmits a stop signal to the timepiece when the light receiving device detects a light / dark transition of the received light beam.

Figure 00000001
Figure 00000001

Description

Es ist bekannt, die Laufzeit von Licht mit Hilfe von Geräten zu messen, die kurze Lichtimpulse aussenden, an die sich jeweils eine relativ lange Dunkelphase anschließt. Als Lichtquelle wurden Laserdioden für den Impulsbetrieb vorgeschlagen ( Praxis der Naturwissenschaften – Physik 4/41. Jg. 1992, S. 21). Gemessen wird die Laufzeit der Lichtimpulse zwischen dem Sender und einem Empfänger.It is known to measure the duration of light by means of devices, send out the short light pulses, to each of which a relative long dark phase connects. As a light source laser diodes have been proposed for the pulse operation (Praxis der Naturwissenschaften - Physik 4/41, Jg. 21). The transit time of the light pulses between the transmitter is measured and a receiver.

Es ist zweckmäßig, Licht im sichtbaren Spektralbereich auszusenden. Die Justage von Sender, Empfänger und ggfs. Umlenkspiegeln oder das Anpeilen von Reflektoren und Gegenständen wird dadurch erleichtert.It is appropriate, light in the visible spectral range. The adjustment of transmitter, receiver and if necessary, deflecting mirrors or the sighting of reflectors and objects thereby facilitated.

Allerdings sind wegen der langen Dunkelphasen hohe Impulsleistungen erforderlich, damit der Auftrefffleck auf einem angepeilten Gegenstand ebenso gut erkennbar ist, wie man es von einem Laserpointer gewohnt ist. Dies erfordert den Einsatz spezieller Laserdioden für Impulsbetrieb; es schließt die Verwendung preisgünstiger Laserdioden für Gleichlichtbetrieb, wie sie etwa in Laserpointern eingesetzt werden, aus.Indeed high pulse power is required because of the long dark phases, so that the impact spot on a targeted object as well It is easy to see how it is used to from a laser pointer. This requires the use of special laser diodes for pulsed operation; it closes the Use cheaper Laser diodes for constant light operation, as used in laser pointers, for example.

Der im Patentanspruch angegebenen Erfindung liegt das Problem zugrunde, helle Auftreffflecke mit Laserdioden zu erzielen, die nicht für Impulsbetrieb vorgesehen sind.Of the in claim the invention is based on the problem to achieve bright landing spots with laser diodes that are not for pulsed operation are provided.

Dieses Problem wird durch die im Patentanspruch aufgeführten Merkmale gelöst.This Problem is solved by the features listed in the claim.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere dann, daß Laserdioden, die in Laserpointern Verwendung finden, hervorragend für die Messung der Lichtgeschwindigkeit in transparenten Medien und für Entfernungsmessungen in Verbindung mit Reflektoren geeignet sind. Auftreffflecke sind auch aus größerer Entfernung gut sichtbar; Reflektoren können aus Entfernungen über 100m leicht angepeilt werden.The particular advantages are achieved with the invention that laser diodes, which are used in laser pointers, excellent for the measurement the speed of light in transparent media and for distance measurements are suitable in conjunction with reflectors. Impact spots are also from a greater distance clearly visible; Reflectors can from distances over 100m easy to be targeted.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.One embodiment The invention is illustrated in the drawing and will be described below described in more detail.

Es zeigenIt demonstrate

1 ein Gerät zur Entfernungsmessung, 1 a device for distance measurement,

2 die Ausgangsleistung P des Senders in Abhängigkeit von der Zeit t. 2 the output power P of the transmitter as a function of the time t.

Das Zeitmeßgerät erhält jedesmal ein START-Signal vom Sender, wenn die Laserdiode dunkel getastet wird und ein STOP-Signal vom Empfänger, wenn ein hell/dunkel-Sprung empfangen wird. Aus der gemessenen Laufzeit läßt sich die Entfernung 1 berechnen.The Timepiece gets everytime a START signal from the transmitter when the laser diode is dark will and a STOP signal from the receiver when a light / dark jump Will be received. The distance 1 can be calculated from the measured transit time.

Claims (1)

Vorrichtung zur Laufzeitmessung von Licht in transparenten Medien mit einer Licht emittierenden Einrichtung zum Erzeugen eines Lichtstrahls, einer Lichtempfangseinrichtung zum Empfangen eines reflektierten Lichtstrahls von einem Reflexionselement, der aus dem von der Licht emittierenden Einrichtung erzeugten Lichtstrahl resultiert, dadurch gekennzeichnet, dass die Licht emittierende Einrichtung zum Erzeugen eines Lichtstrahls eine Laserdiode ist, die Dauerlicht aussendet, das von zeitlich kurzen Dunkelimpulsen, die wesentlich kürzer als die Lichtphase des Lichtstrahls zwischen zwei Dunkelimpulsen sind, unterbrochen ist, dass die Laserdiode jedes Mal ein Start-Signal an ein Zeitmessgerät übermittelt, wenn der kurze Dunkelimpuls des von der Laserdiode emittierten Lichtstrahls beginnt, und die Lichtempfangseinrichtung ein Stopp-Signal an das Zeitmessgerät übermittelt, wenn die Lichtempfangseinrichtung einen hell/dunkel Übergang des empfangenen Lichtstrahls detektiert.Apparatus for measuring the transit time of light in transparent media comprising a light-emitting device for generating a light beam, a light-receiving device for receiving a reflected light beam from a reflection element resulting from the light beam generated by the light-emitting device, characterized in that the light-emitting device for Generating a light beam is a laser diode that emits continuous light, which is interrupted by short time dark pulses, which are significantly shorter than the light phase of the light beam between two dark pulses, that the laser diode transmits a start signal to a timepiece every time the short Dark pulse of the light beam emitted from the laser diode starts, and the light receiving device transmits a stop signal to the timepiece when the light receiving device detects a light / dark transition of the received light beam.
DE19741887A 1997-09-23 1997-09-23 Device for transit time measurement of light Expired - Fee Related DE19741887B4 (en)

Priority Applications (1)

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Applications Claiming Priority (1)

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DE19741887B4 true DE19741887B4 (en) 2006-08-03

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013112553A1 (en) * 2013-11-14 2015-06-03 Odos Imaging Ltd. Lighting device and method for illuminating an object
DE102014117097B3 (en) 2014-11-21 2016-01-21 Odos Imaging Ltd. Distance measuring device and method for determining a distance
DE102014117705B3 (en) 2014-12-02 2016-02-18 Odos Imaging Ltd. Distance measuring device and method for determining a distance

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015566A1 (en) * 1979-03-07 1980-09-17 Endress u. Hauser GmbH u.Co. Distance measuring instrument according to the pulse transit time method
DE4436447C2 (en) * 1994-10-13 1996-10-02 Leica Ag Method and device for electro-optical distance measurement
DE4133196C2 (en) * 1990-10-05 1997-08-21 Mitsubishi Electric Corp Distance measuring device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015566A1 (en) * 1979-03-07 1980-09-17 Endress u. Hauser GmbH u.Co. Distance measuring instrument according to the pulse transit time method
DE4133196C2 (en) * 1990-10-05 1997-08-21 Mitsubishi Electric Corp Distance measuring device
DE4436447C2 (en) * 1994-10-13 1996-10-02 Leica Ag Method and device for electro-optical distance measurement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Z: Praxis der Naturwissenschaften - Physik 4/41. Jg., 1992, S. 21 ff. *

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