A low-cost, optical feedback laser range-finder with chirp-control

Bosch, Thierry; Pavageau, S.; D'Alessandro, D.; Servagent, Noël; Annovazzi-Lodi, V.; Donati, Silvano

doi:10.1109/imtc.2001.928244

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…This paper shows another application of self-mixing interferometry for the measurement of absolute distance. In literature other approaches are described [18][19][20][21] , but the obtained performances are not comparable with the present realization, in term of speed, resolution and compactness.…”

Section: Introductioncontrasting

confidence: 61%

A compact rangefinder based on self-mixing interferometry

et al. 2012

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This paper presents the development of an optical rangefinder based on self-mixing interferometry. The instrument measures the absolute distance from a remote target, without contact and respecting the Class I safety. A variation of the laser diode bias current origins a modulation of the wavelength and then, due to the phase shift along the channel path, the presence of a target generates interferometric fringes. The electrical frequency of the fringes signal is proportional to the target distance. The realized device consists in analog and digital circuits. The analog circuits drive the laser diode, detect the interferometric signal and filter it. A Digital Signal Processor is needed to acquire the fringes signal and, by extracting its frequency, evaluate the absolute distance. The developed rangefinder allows spatial resolution better than 100 µm over a range from 5 cm to 2 m.

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Section: Introductioncontrasting

confidence: 61%

A compact rangefinder based on self-mixing interferometry

et al. 2012

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“…The techniques for higher resolution LiDAR range finder are already available. Bosch et al [20] proposed a method with the accuracy less than 100 µm and INRS [21] proposed a low cost instrument with the same accuracy in the range of tens of meters. Figure 6 The creation of the reference plane and rotation of study bridge surface…”

Section: Lidar Data Processingmentioning

confidence: 99%

The role of terrestrial 3D LiDAR scan in bridge health monitoring

et al. 2010

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This paper addresses the potential applications of terrestrial 3D LiDAR scanning technologies for bridge monitoring. High resolution ground-based optical-photonic images from LiDAR scans can provide detailed geometric information about a bridge. Applications of simple algorithms can retrieve damage information from the geometric point cloud data, which can be correlated to possible damage quantification including concrete mass loss due to vehicle collisions, large permanent steel deformations, and surface erosions. However, any proposed damage detection technologies should provide information that is relevant and useful to bridge managers for their decision making process. This paper summaries bridge issues that can be detected from the 3D LiDAR technologies, establishes the general approach in using 3D point clouds for damage evaluation and suggests possible bridge state ratings that can be used as supplements to existing bridge management systems (BMS).

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“…A recent method used by Bosch et al [19] to reduce the resolution and error of the range finding system is to use a Mach Zehnder interferometer. This setup eliminates the extra chirp created by temperature and other effects and leads to constant spacing between the peaks.…”

Section: Thermal Effectsmentioning

confidence: 99%

Optimum injection current waveform for a laser rangefinder based on the self-mixing effect

2004

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In a self-mixing type laser range finder the current of the laser is modulated with a triangle wave to produce a range of optical frequencies. However, the electrical signal does not produce a perfect linear sweep in optical frequency due to thermal and other effects in the laser. This leads to errors in the accuracy and resolution of the range finder. In this paper, we describe and implement a method in software to systematically determine the optimal shape of the injected waveform needed to eliminate these thermally induced measurement errors. With this method we do not require the more complicated and expensive optical techniques used by other researchers to recover the optical frequency variations with regard to injection current. The averaging of a reasonable number of samples gave sub-millimeter accuracy when the optimal current shape was used. The uncertainty in the average measurements are improved by roughly six times compared to the conventional triangular modulation. The reshaping also results in the range finding system being less sensitive to changes in ambient temperature.

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A low-cost, optical feedback laser range-finder with chirp-control

Cited by 6 publications

References 14 publications

A compact rangefinder based on self-mixing interferometry

A compact rangefinder based on self-mixing interferometry

The role of terrestrial 3D LiDAR scan in bridge health monitoring

Optimum injection current waveform for a laser rangefinder based on the self-mixing effect

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