DE19741887A1 - Device for measuring transit time of light in transparent media - Google Patents

Device for measuring transit time of light in transparent media

Info

Publication number
DE19741887A1
DE19741887A1 DE19741887A DE19741887A DE19741887A1 DE 19741887 A1 DE19741887 A1 DE 19741887A1 DE 19741887 A DE19741887 A DE 19741887A DE 19741887 A DE19741887 A DE 19741887A DE 19741887 A1 DE19741887 A1 DE 19741887A1
Authority
DE
Germany
Prior art keywords
light
transit time
transparent media
measuring transit
measuring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19741887A
Other languages
German (de)
Other versions
DE19741887B4 (en
Inventor
Peter Brockhaus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE19741887A priority Critical patent/DE19741887B4/en
Publication of DE19741887A1 publication Critical patent/DE19741887A1/en
Application granted granted Critical
Publication of DE19741887B4 publication Critical patent/DE19741887B4/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • 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

Landscapes

  • 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

The equipment employs a laser diode, which transmits a continuous beam of light interrupted by short dark phases.

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 transit time of light using devices that are short Send out light pulses, each followed by a relatively long dark phase. Laser diodes for pulse operation have been proposed as the light source (practice of Natural Sciences Physics 4/41. Vol. 1992, p. 21). The duration of the Light pulses between the transmitter 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 advisable to emit light in the visible spectral range. The adjustment of Transmitter, receiver and possibly deflecting mirrors or the targeting of reflectors and This makes objects easier.

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 Laser­ dioden für Gleichlichtbetrieb, wie sie etwa in Laserpointern eingesetzt werden, aus.However, due to the long dark phases, high pulse powers are required so that the impact spot on a targeted object can be recognized just as well, as you are used to from a laser pointer. This requires the use of special Laser diodes for pulse operation; it excludes the use of inexpensive lasers diodes for constant light operation, such as those used in laser pointers.

Der im Patentanspruch angegebenen Erfindung liegt das Problem zugrunde, helle Auftreffflecke mit Laserdioden zu erzielen, die nicht für Impulsbetrieb vorgesehen sind.The invention specified in the claim is based on the problem, bright To achieve impact spots with laser diodes that are not intended for pulse operation are.

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 darin, daß Laser­ dioden, 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 100 m leicht angepeilt werden.The advantages achieved with the invention are, in particular, that lasers diodes used in laser pointers, excellent for measuring the Speed of light in transparent media and for distance measurements in Connection with reflectors are suitable. Impact spots are also larger Distance clearly visible; Reflectors can easily from distances over 100 m be targeted.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and is in following described in more detail.

Es zeigenShow it

Fig. 1 ein Gerät zur Entfernungsmessung, Fig. 1 shows an apparatus for distance measurement,

Fig. 2 die Ausgangsleistung P des Senders in Abhängigkeit von der Zeit t. Fig. 2 shows the output power P of the transmitter as a function of 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 receives a START signal from the transmitter whenever the laser diode is blanked and a STOP signal from the receiver when a light / dark jump is received. The distance 1 can be calculated from the measured transit time.

Claims (1)

Vorrichtung zur Lautzeitmessung von Licht in transparenten Medien, dadurch gekennzeichnet, daß eine Laserdiode Dauerlicht aussendet, das von kurzen Dunkelphasen unterbrochen wird.Device for measuring the time of light in transparent media, characterized, that a laser diode emits continuous light, which is interrupted by short dark phases becomes.
DE19741887A 1997-09-23 1997-09-23 Device for transit time measurement of light Expired - Fee Related DE19741887B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19741887A DE19741887B4 (en) 1997-09-23 1997-09-23 Device for transit time measurement of light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19741887A DE19741887B4 (en) 1997-09-23 1997-09-23 Device for transit time measurement of light

Publications (2)

Publication Number Publication Date
DE19741887A1 true DE19741887A1 (en) 1999-03-25
DE19741887B4 DE19741887B4 (en) 2006-08-03

Family

ID=7843304

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19741887A Expired - Fee Related DE19741887B4 (en) 1997-09-23 1997-09-23 Device for transit time measurement of light

Country Status (1)

Country Link
DE (1) DE19741887B4 (en)

Cited By (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
US10401483B2 (en) 2014-12-02 2019-09-03 Odos Imaging Ltd. Distance measuring device and method for determining a distance
US10557703B2 (en) 2014-11-21 2020-02-11 Rockwell Automation Limited Distance measuring device and method for determining a distance

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2908854C2 (en) * 1979-03-07 1986-04-17 Endress U. Hauser Gmbh U. Co, 7867 Maulburg Distance measuring device based on the pulse time-of-flight method
US5179286A (en) * 1990-10-05 1993-01-12 Mitsubishi Denki K.K. Distance measuring apparatus receiving echo light pulses
DE4436447C2 (en) * 1994-10-13 1996-10-02 Leica Ag Method and device for electro-optical distance measurement

Cited By (6)

* 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
EP3069167A1 (en) * 2013-11-14 2016-09-21 Odos Imaging Ltd. Method for illuminating an object
US10241204B2 (en) 2013-11-14 2019-03-26 Odos Imaging Ltd. Method for illuminating an object
EP3069167B1 (en) * 2013-11-14 2023-01-11 Odos Imaging Ltd. Method for illuminating an object and for determining a distance
US10557703B2 (en) 2014-11-21 2020-02-11 Rockwell Automation Limited Distance measuring device and method for determining a distance
US10401483B2 (en) 2014-12-02 2019-09-03 Odos Imaging Ltd. Distance measuring device and method for determining a distance

Also Published As

Publication number Publication date
DE19741887B4 (en) 2006-08-03

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Legal Events

Date Code Title Description
8139 Disposal/non-payment of the annual fee
8170 Reinstatement of the former position
8110 Request for examination paragraph 44
8364 No opposition during term of opposition
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee