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Interferometric distance-measuring method with delayed chirp signal and such an apparatus

A distance measuring method and technology of a distance measuring device, which are applied in the direction of measuring devices, optical devices, interferometers, etc., can solve the problems of measured distance errors and the like

Active Publication Date: 2012-09-05
LEICA GEOSYSTEMS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Acceleration or vibration of the target during the measurement process can cause errors in the measured distance

Method used

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  • Interferometric distance-measuring method with delayed chirp signal and such an apparatus
  • Interferometric distance-measuring method with delayed chirp signal and such an apparatus
  • Interferometric distance-measuring method with delayed chirp signal and such an apparatus

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Embodiment Construction

[0027] figure 1 The time dependence of the wavelength of the interferometric ranging method is illustrated in a schematic diagram. The radiation emitted by the range finder is frequency modulated by a signal generator such that the rising and falling ramps in the form of a wavelength λ vary as a function of time. However, this form of modulation or transmission of the prior art produces time-separated (ie sequential) rising and falling ramps such that the measurement rate is halved and varied within the time scale of the ramps, or the corresponding period causes errors.

[0028] Therefore, in the prior art of interferometric ranging methods described figure 2 The wavelength λ of the modulated radiation component with opposite chirp shown schematically in 1 or lambda 2 time dependence. The radiation emitted to the target thus has two radiation components which have different wavelength variations over time, ie opposite frequency ramps. The radiation components may in part...

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Abstract

In a distance-measuring method comprising a distance- measuring apparatus having at least one frequency- modulatable laser source for producing chirped laser radiation. The laser radiation has radiation components with opposite chirp as time dependency of the modulated wavelengths, the simultaneous oppositeness of the frequency curve being realized via an optical delay path (3) for one of the tworadiation components. The radiation produced is passed in a measuring interferometer (5) to a target (6) and parallel via a local Oscillator. After reception of the laser radiation scattered back from the target (6) and passed via the local oscillator path, the laser radiation received is converted into signals and the distance to the at least one target (6) is determined from the signals on the basis of interferometric mixing.

Description

technical field [0001] The invention relates to an interferometric distance measurement method using delayed chirp signals according to the preamble of claim 1 and an interferometric distance measurement device according to the preamble of claim 6 . Background technique [0002] Various principles and methods are known in the field of electronic distance measurement. One method consists, for example, of emitting electromagnetic radiation, such as light, towards the object to be measured and then receiving one or more echoes from back-scattering objects (ideally only from the object to be measured), the object to be measured Targets can have both reflective (eg, retroreflector) and diffuse backscatter properties. [0003] After reception, an optional superimposed echo signal is superimposed on the mixing signal, whereby the frequency of the signal to be analyzed is reduced, thereby reducing the outlay for the device. This mixing can be performed in a homodyne method with th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B9/02G01S17/32G01S7/481G01S7/499G01B11/02G01S17/34
CPCG01B2290/60G01B9/02007G01S17/325G01S7/499G01B9/02004G01S7/4818G01B9/02067G01B11/026G01B2290/70G01B9/02G01S17/34
Inventor 托马斯·延森马塞尔·罗纳
Owner LEICA GEOSYSTEMS AG