&lt;title&gt;High-resolution laser rangefinder based on a phase-shift measurement method&lt;/title&gt;

Journet, Bernard; Poujouly, Stephane

doi:10.1117/12.334326

Cited by 23 publications

(12 citation statements)

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“…The direct time counting is presented here associated to the heterodyne technique. During this process the phase shift remains constant, it is possible to convert the short time propagation, at a high frequency f0' into a wider time interval, at a lower frequency fj , so easier to determine [10]. In order to achieve the heterodyne technique it is necessary to synthesize two frequencies, the first one being the modulation frequency Jo and the second one being a local frequency fLO = Jo -fi .…”

Section: Analog Systemmentioning

confidence: 98%

<title>Time-of-flight laser rangefinding systems</title>

Journet

2002

SPIE Proceedings

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Laser range finders are now rather developed with a wide application field concerning indoor robotic, non destructive testing, inspection and security control or automotive intelligent cruise control. Interferometry, self-mixing, fringe pattern projection, triangulation and flight time measurement methods are the most important methods. Flight time based methods require a modulation of the optical beam, which can be made by pulse, sine wave or chirp signal or even pseudo random code signal. The aim of this paper is to present rather simple techniques leading to low cost systems. Pulse modulation is typically interesting in case of wide range measurement, but is also developed for medium range. The main interest of the phase-shift measurement method is the conversion of a short time of flight interval into a wider interval through the phase of the signal. That is obtained either by the heterodyne process which keeps the phase shift constant or by the intermediate frequency sampling technique. This phase-shift method is dedicated to medium or short range. Modulating signal with a wider spectrum should lead to more powerful system. In this way the FMCW-like method, based on a chirped frequency signal, is a new technique developed as for radar leading also to rather simple systems. Nevertheless the implementation of the method present some problems. With more complex modulating signals the detection needs important signal processing developments, but it should be possible to use the technology already developed for telecommunication systems or for GPS by the way ofpseudo-random codes. Finally it is possible to move towards smart systems by combining several modulating signals and introducing digital control in the system.

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Section: Analog Systemmentioning

confidence: 98%

<title>Time-of-flight laser rangefinding systems</title>

Journet

2002

SPIE Proceedings

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“…The shorter electrode leads to a sharper jumping, but also leads to a higher half-wave voltage from Eq. (7). Here supposing that an appropriate transit-time t is selected so that its effect on measuring error can be acceptable.…”

Section: Theory Analysismentioning

confidence: 99%

“…At present, there are several major methods in laser ranging region, such as the pulsed time-of-flight laser ranging based on laser pulse [2][3][4], the phase-shift method based on modulated laser phase [5][6][7], the frequency comparison method based on modulated laser frequency [8][9][10], and the mixed methods of some ones of the above [11]. However, these preceding methods need some complex additional circuit systems to handle the range information.…”

Section: Introductionmentioning

confidence: 99%

Laser ranging based on electro-optic switch

Dong

Liu

Wang

et al. 2006

Optik

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“…And it is also an effective method to increase the processing of digital bits to improve measurement accuracy and resolution [15]. Reference [16] also found the modulation signal frequency and both reference and phase shifted signal at intermediate frequency had influence on the accuracy and resolution. Researchers had made some prototypes, with difference frequency to meet various functions.…”

Section: Introductionmentioning

confidence: 98%

A least-square-based approach to improve the accuracy of laser ranging

Xiao

Zheng

et al. 2014

2014 International Conference on Multisensor Fusion and Information Integration for Intelligent Systems (MFI)

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Laser ranging is an emerging measurement technology in recent decades. In the short-range distance, phaseshift laser ranging has a wide range of applications. To improve the phase-shift laser ranging measurement accuracy, through analyzing principles and characteristics of phase-shift laser ranging, we proposed a novel method based on the least-square method. Then a theoretical model is established and verified by experiment. Later we compute residual sum of squares of leastsquare and residual sum of squares of piecewise linear, and make the average rate of residual sum of squares decrease by 22.06797%.

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<title>High-resolution laser rangefinder based on a phase-shift measurement method</title>

Cited by 23 publications

References 0 publications

<title>Time-of-flight laser rangefinding systems</title>

<title>Time-of-flight laser rangefinding systems</title>

Laser ranging based on electro-optic switch

A least-square-based approach to improve the accuracy of laser ranging

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