System for calibrating a distance measuring device

Patent metadata

Field	Value
Publication number	US-9638790-B2
Application number	US-201514969003-A
Country	US
Kind code	B2
Filing date	Dec 15, 2015
Priority date	Dec 17, 2014
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

The invention relates to a system for calibrating a distance measuring device, comprising: a measuring track, on which the distance measuring device is mountable; an areal reflector mountable shiftably on the measuring track for reflecting a measurement signal transmitted from the distance measuring device back to the distance measuring device, so that by means of the distance measuring device a distance measurement for determining a distance (D) between the distance measuring device and the reflector is performable; and a laser distance measuring device mountable on the measuring track for registering tilt of the reflector; wherein means for orienting the distance measuring device are provided, so that measurement signals of the distance measuring device reflected back to the distance measuring device by means of the reflector are received with maximum intensity by the distance measuring device.

First claim

The invention claimed is:

1. A system for calibrating a distance measuring device, comprising:
a measuring track, on which the distance measuring device is mountable;
an areal reflector mountable shiftably on said measuring track for reflecting a measurement signal transmitted from the distance measuring device back to the distance measuring device, so that by means of the distance measuring device a distance measurement for determining a distance (D) between the distance measuring device and the reflector is performable;
a laser distance measuring device mountable on said measuring track for registering tilt of said reflector 4 ; and
means for orienting the distance measuring device, so that measurement signals of the distance measuring device reflected back to the distance measuring device by means of said reflector are received by the distance measuring device with maximum intensity.

2. The system as claimed in claim 1 , wherein:
said reflector is removable from the radiation path of the measurement signals of the distance measuring device, so that said laser distance measuring device can determine a distance (R) between the distance measuring device and said laser distance measuring device.

3. The system as claimed in claim 2 , wherein:
said reflector includes lengthwise displaceable holder, so that a lengthwise displacement of said holder brings said reflector into the radiation path or out of the radiation path.

4. The system as claimed in claim 1 , further comprising:
an evaluation unit, which from a change of the distance (R) between said laser distance measuring device and the distance measuring device deduces an accuracy of the calibrating.

5. The system as claimed in claim 1 , wherein:
said measuring track includes at least one rail; and
said reflector includes at least one rail wheel, by means of which said reflector is shiftable on said at least one rail.

6. A method for calibrating a distance measuring device by means of a measuring track, which has a laser distance measuring device, comprising the steps as follows:
mounting the distance measuring device on the measuring track, such that the distance measuring device and the laser distance measuring device stand opposite one another;
arranging an areal reflector between the distance measuring device and the laser distance measuring device, such that measurement signals transmitted by the distance measuring device are reflected on the reflector;
orienting the reflector by means of the laser distance measuring device, such that the reflector is arranged perpendicular to the measuring track;
orienting the distance measuring device parallel to the reflector, such that measurement signals of the distance measuring device reflected back by the reflector are received with maximum intensity by the distance measuring device; and
calibrating the distance measuring device with shifting of the reflector ( 4 ) along the measuring track.

7. The method as claimed in claim 6 , wherein:
before each calibrating, the reflector is removed from the measuring track, in order to determine a distance (R) between the distance measuring device and the laser distance measuring device, in order to compensate for temperature influences and length changes.

Assignees

• Endress Hauser Gmbh Co Kg

Inventors

• Langendorf Bjorn
• Sturm Michael
• Faber Harald

Classifications

• G01F23/284

  Electromagnetic waves · CPC title

• G01S17/08

  for measuring distance only (indirect measurement G01S17/46; active triangulation systems G01S17/48) · CPC title

• G01S2007/4086

  Physics · mapped topic

• G01S7/4052 Primary

  by simulation of echoes · CPC title

• G01S13/88

  Radar or analogous systems specially adapted for specific applications (electromagnetic prospecting or detecting of objects, e.g. near-field detection, G01V3/00) · CPC title