A low-cost laser range finder based on an FMCW-like method

Journet, Bernard; Bazin, G.

doi:10.1109/19.863935

Cited by 45 publications

(22 citation statements)

References 6 publications

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“…By comparison, better resolutions can be achieved by using the other three methods based on continuous-wave (CW). More precisely, FMCW [4,[7][8][9] and phase-shift ranging [4,[10][11][12][13] can be used to achieve a resolution of several tens of microns or even several microns, while a nanometer-level resolution can be achieved by using interferometry [14,15]. However, long distance (4 1 km) measurement is still a great challenge to a CW ranging system, because of the very low returned light power which is inversely proportional to the 4th power of the distance being measured [1,16].…”

Section: Introductionmentioning

confidence: 99%

Increasing the operating distance of a phase-shift laser range-finding system by using an active reflector

Mei

et al. 2015

Optics Communications

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Section: Introductionmentioning

confidence: 99%

Increasing the operating distance of a phase-shift laser range-finding system by using an active reflector

Mei

et al. 2015

Optics Communications

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“…Typically, an optical sensor techniques based on laser displacement meter (LDM) can be divided into the following types: time-of-flight [1,2,3,4], triangulation [5,6], frequency modulation continuous-wave (FMCW) phase measurement [7,8], phase shift [9,10,11,12,13,14], interferometry method [15,16,17,18,19] and others [20,21,22]. Among these types, interferometry method is well-known for providing the highest resolution [15,16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

An Improved Measurement Method for the Strength of Radiation of Reflective Beam in an Industrial Optical Sensor Based on Laser Displacement Meter

Bae

2016

Sensors

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An optical sensor such as a laser range finder (LRF) or laser displacement meter (LDM) uses reflected and returned laser beam from a target. The optical sensor has been mainly used to measure the distance between a launch position and the target. However, optical sensor based LRF and LDM have numerous and various errors such as statistical errors, drift errors, cyclic errors, alignment errors and slope errors. Among these errors, an alignment error that contains measurement error for the strength of radiation of returned laser beam from the target is the most serious error in industrial optical sensors. It is caused by the dependence of the measurement offset upon the strength of radiation of returned beam incident upon the focusing lens from the target. In this paper, in order to solve these problems, we propose a novel method for the measurement of the output of direct current (DC) voltage that is proportional to the strength of radiation of returned laser beam in the received avalanche photo diode (APD) circuit. We implemented a measuring circuit that is able to provide an exact measurement of reflected laser beam. By using the proposed method, we can measure the intensity or strength of radiation of laser beam in real time and with a high degree of precision.

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“…In addition, obstacle distance measurement can also performed by triangulation for up to 30 meters. A laser range finder with a measurement range from 5 to 40 meters was proposed by Bernard and Gaëlle 10 (FMCW). Laser triangulation is normally used in conjunction with position sensing detectors (PSDs) or with charge coupled devices (CCDs), where the centroid position is found through intensity profile fitting to a similar Gaussian shaped laser spot.…”

Section: Introductionmentioning

confidence: 99%

Laser range finder with CMOS image sensor in automotive field

Chang

2004

Novel Optical Systems Design and Optimization VII

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A low cost prototype of a laser range finder using a CMOS image sensor is developed for the automotive field. The system presented here is based on triangulation. The gravity of the infrared laser spot on CMOS image sensor is converted into pixel coordinates proportional to the distance to be measured. Based on the experimental tests of the system, it was found that the distance could be estimated with accuracy better than 5% within the range of 5 to 45 meters at twilight and night. Experimental results are provided and possible improvements are discussed.

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A low-cost laser range finder based on an FMCW-like method

Cited by 45 publications

References 6 publications

Increasing the operating distance of a phase-shift laser range-finding system by using an active reflector

Increasing the operating distance of a phase-shift laser range-finding system by using an active reflector

An Improved Measurement Method for the Strength of Radiation of Reflective Beam in an Industrial Optical Sensor Based on Laser Displacement Meter

Laser range finder with CMOS image sensor in automotive field

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