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Optical-electronic distance measuring device

A technology for photoelectric ranging and equipment, which is used in radio wave measurement systems, measurement devices, and re-radiation of electromagnetic waves. It can solve problems such as long effective burst time and unfavorable filters.

Inactive Publication Date: 2013-10-16
LEICA GEOSYSTEMS AG
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Problems solved by technology

[0016] However, the relatively long period required for filter synchronization proves to be disadvantageous because, contrary to the practical idea of ​​the burst modulation principle, a relatively long effective burst time must also be chosen

Method used

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Embodiment Construction

[0039] figure 1 A burst modulation signal diagram is shown to illustrate the characteristics of burst modulation of emitted optical radiation. The duration during which a modulating signal M with a specific modulating frequency exists is called the effective burst time t Burst-on . On the other hand, the dead time t Burst-off is the duration of the absence of the modulating signal M. Effective burst time t Burst-on and dead time t Burst-off constitutes a period known as the burst period t Burst , where t Burst =t Burst-on +t Burst-off .

[0040] The duty cycle of a burst signal is defined as the effective burst duration t Burst-on with measuring cycle t Burst percentage. Consequently, pulse train modulation differs from pulse modulation in that the modulating signal is present quasi-continuously over the entire duration of the measurement period. In the case of burst modulation, on the other hand, only during the burst period t Burst Modulating signal M exists on...

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Abstract

The invention relates to an optical-electronic distance measuring method according to the phase measurement principle by emitting of optical measuring radiation, which is modulated according to the burst modulation principle, having a burst period duration made of an active burst time and a dead time, receiving at least a part of the measuring radiation (23), which is reflected on the measured object, wherein transforming into an input measuring signal (ES) is performed, and determining a distance to the measured object by analyzing a measuring signal (MS, gMS) generated from the input measuring signal (ES).

Description

technical field [0001] The invention relates to a photoelectric distance measurement method, a photoelectric distance measurement device and a receiving circuit for photoelectric distance measurement. Background technique [0002] Common types of electro-optical distance measuring devices are well known from the prior art. They have a range of tens of meters and are often handheld. They are mainly used for architectural surveying or interior finishing, for example, for 3D measurements of houses. Other fields of use of distance measuring devices are geodetic and industrial surveying. The basic principle of distance measurement with known distance-measuring devices is based on the evaluation of the temporal variation of the properties of the electromagnetic radiation emitted by the distance-measuring device and reflected by the targeted object. For this purpose, the distance measuring device is equipped with a transmitter for emitting radiation whose intensity can be modula...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/10G01S17/36G01S7/484G01S7/491G01S7/4912
CPCG01S7/4912G01S17/36G01S7/491G01S7/484G01S17/10
Inventor 彼得·弗勒库尔特·吉热
Owner LEICA GEOSYSTEMS AG
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