Intensity Control of Triangulation Based PSD Sensor Independent of Object Color Variation

Jung, Jong Kyu; Kang, Sung Gwon; Nam, Joon Sik; Park, Kyi Hwan

doi:10.1109/jsen.2011.2157968

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…The measurement accuracy of the LTDP is affected by the speckle [ 5 ], the color of the measured object [ 6 ], the surface texture [ 7 ], the ambient light, variation in the laser beam intensity [ 6 , 8 ], distortion of the receiver lens [ 9 ], and instability of the source laser beam. Shen et al [ 8 ] introduced a digital correlation method for suppressing the speckle noise.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, Blais [ 11 ] and Loranger [ 12 ] introduced a Biris method by inserting a dual-aperture mask next to the imaging lens to create two points on the CCD. Jung et al [ 6 ] and Shen et al [ 8 ] reported an adaptive control technique to maintain a stable beam intensity. Keyence [ 13 ] proposed a real peak detection algorithm that aimed to detect the true peak position value rather than the traditional centroid value to avoid the effect of the oversized diameter.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reduction of the Influence of Laser Beam Directional Dithering in a Laser Triangulation Displacement Probe

Yang¹,

Tao²,

Zhang³

et al. 2017

Sensors

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Directional dithering of a laser beam potentially limits the detection accuracy of a laser triangulation displacement probe. A theoretical analysis indicates that the measurement accuracy will linearly decrease as the laser dithering angle increases. To suppress laser dithering, a scheme for reduction of the influence of laser beam directional dithering in a laser triangulation displacement probe, which consists of a collimated red laser, a laser beam pointing control setup, a receiver lens, and a charge-coupled device, is proposed in this paper. The laser beam pointing control setup is inserted into the source laser beam and the measured object and can separate the source laser beam into two symmetrical laser beams. Hence, at the angle at which the source laser beam dithers, the positional averages of the two laser spots are equal and opposite. Moreover, a virtual linear function method is used to maintain a stable average of the positions of the two spots on the imaging side. Experimental results indicate that with laser beam pointing control, the estimated standard deviation of the fitting error decreases from 0.3531 mm to 0.0100 mm, the repeatability accuracy can be lowered from ±7 mm to ±5 sans-serifμnormalm, and the nonlinear error can be reduced from ±6 % FS (full scale) to ±0.16 % FS.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reduction of the Influence of Laser Beam Directional Dithering in a Laser Triangulation Displacement Probe

Yang¹,

Tao²,

Zhang³

et al. 2017

Sensors

View full text Add to dashboard Cite

show abstract

“…This method can reduce the measurement time by averaging the results of the two orders. Jung et al [8] and Shen et al [6] interpreted an adaptive control technique to maintain a stable beam intensity. Keyence [9] proposed a real peak detection algorithm that aimed to detect the true peak position value rather than the traditional centroid value to avoid the effect of the oversized diameter.…”

Section: Introductionmentioning

confidence: 99%

Development of a Laser Triangulation Displacement Probe with Laser Beam Pointing Control

Yang¹,

Tao²,

Zhang³

et al. 2017

Preprint

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Directional dithering of a laser beam potentially limits the detection accuracy of a laser triangulation displacement probe. A theoretical analysis indicates that the measurement accuracy will linearly decrease as the laser dithering angle increases. To suppress laser dithering, a laser triangulation displacement probe with laser beam pointing control, which consists of a collimated red laser, a laser beam pointing control setup, a receiver lens, and a charge-coupled device, is proposed in this paper. The laser beam pointing control setup is inserted into the source laser beam and the measured object and can separate the source laser beam into two symmetrical laser beams. Hence, at the angle at which the source laser beam dithers, the positional averages of the two laser spots are equal and opposite. Moreover, a laser dithering compensation algorithm is used to maintain a stable average of the positions of the two spots on the imaging side. Experimental results indicate that with laser beam pointing control, the standard variance of the fitting error decreases from 0.3531 to 0.0100, the repeatability accuracy can be decreased from ±7 mm to ±5 µm, and the nonlinear error can be reduced from ±6 %FS to ±0.16 %FS.

show abstract

Design and Performance of a Laser-Based Compact Position Sensor for Long Standoff Distance

2018

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Intensity Control of Triangulation Based PSD Sensor Independent of Object Color Variation

Cited by 4 publications

References 7 publications

Reduction of the Influence of Laser Beam Directional Dithering in a Laser Triangulation Displacement Probe

Reduction of the Influence of Laser Beam Directional Dithering in a Laser Triangulation Displacement Probe

Development of a Laser Triangulation Displacement Probe with Laser Beam Pointing Control

Design and Performance of a Laser-Based Compact Position Sensor for Long Standoff Distance

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