Laser distance measuring module with ADC error compensation by varying sampling times

A technology of laser distance measurement and sampling mode, which is applied in the directions of measuring devices, analog/digital conversion, electromagnetic wave re-radiation, etc., and can solve the problems of absolute distance deterioration

Active Publication Date: 2018-06-29
HEXAGON TECH CENT GMBH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This is the case, for example, if the start pulse has an amplitude in the medium modulation range and the stop pulse has an amplitude in the low amplitude range, where, as a result of INL-dominated shape distortion, for example, both The pulses are distorted differently and the absolute distance deteriorates

Method used

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  • Laser distance measuring module with ADC error compensation by varying sampling times
  • Laser distance measuring module with ADC error compensation by varying sampling times
  • Laser distance measuring module with ADC error compensation by varying sampling times

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Embodiment Construction

[0066] Figure 1a and Figure 1b A pulsed time-of-flight principle such as is used in typical electro-optical ranging devices according to the prior art is illustrated.

[0067] Figure 1a A basic diagram of a prior art electro-optical distance measuring device 1 according to the pulse time-of-flight principle is shown. A transmitter 2 and a receiver 3 are arranged in the distance measuring device 1 . Transmitter 2 emits light pulses 4, which are again detected by receiver 3 after reflection or backscattering at the target (eg, a cooperating target object such as retroreflector 5 or a non-cooperating target object such as a natural surface). Backscattered light pulse 4'. Often a continuously modulated transmit signal can also be used instead of optical pulses.

[0068] like Figure 1b Schematically stated in , the distance according to the flight time T f It is determined as the time difference between the moment of initiation of the emission of the light pulse 4 and the ...

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Abstract

A laser distance measuring module with ADC error compensation by varying sampling times. The invention relates to a distance measuring method and an electronic laser distance measuring module, in particular for use in a distance measuring apparatus, especially configured as a laser tracker, tachymeter, laser scanner, or profiler, for fast signal detection with an analog-to-digital converter, wherein conversion errors that arise in the context of a signal digitization, in particular timing, gain and offset errors of the ADC, are compensated for by means of variation of the sampling instants.

Description

technical field [0001] The present invention relates to a ranging method and an electronic laser ranging module for fast signal detection using an analog-to-digital converter (ADC), in particular for ranging devices (eg for laser trackers, distance meters, laser scanners) , or profiler), wherein conversion errors occurring in the context of signal digitization (in particular timing, gain and offset errors of the ADC) are compensated by means of changes in the sampling instant. Background technique [0002] Various principles and methods are known in the fields of electronic and optoelectronic ranging. One method involves emitting pulsed electromagnetic radiation (eg, such as a laser) at the target to be measured, and receiving echoes from the target as a backscattering object, where, for example, the pulse's time-of-flight, shape, and / or phase may be based , to determine the distance from the target to be measured. Such laser distance measuring devices have gained acceptan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/486G01S17/08G01S17/10G01S7/4865
CPCG01S7/4861G01S17/08G01S17/10G01S7/4865H03M1/0624
Inventor R·沃尔格南特S·贝斯特勒J·辛德林
Owner HEXAGON TECH CENT GMBH
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