Sensitivity enhancement of an electro-optic sensor for displacement measurement

Tanwar, L. S.; Gupta, Baij Nath; Bansal, Shashank

doi:10.1117/12.168252

Cited by 10 publications

(3 citation statements)

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“…One of the most common principles of commercial threedimensional sensing is laser triangulation [1][2][3][4], because of its simplicity and robustness. A laser beam projects a spot of light onto a diffuse surface of an object, and a lens collects part of the light scattered from this surface to image the spot on a position sensor.…”

Section: Introductionmentioning

confidence: 99%

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Two-directional scanning method for reducing the shadow effects in laser triangulation

Zeng¹,

Matsumoto²,

Kawachi

1997

Meas. Sci. Technol.

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A two-directional scanning method has been developed to reduce the shadow effects in laser triangulation probes. This method, which we call 2DS, uses an acousto-optic deflector (AOD) as a scanner to allow a diffracted beam to scan an object from two directions, and a position sensor to detect the shift of a spot projected from these two directions alternately by a time-sharing technique. The shadow effects are thereby reduced by this two-direction projection. First we determined the accuracy of the 2DS method by measuring the displacement of a plastic plate along the x- and y-axes and then comparing the results with those obtained using a linear gauge. Then we confirmed the capability of the method by using it to measure the cross sectional shape of a half-ball button, and then comparing the results with those obtained using a conventional one-directional scanning laser triangulation method. A relative uncertainty of 0.8% was obtained.

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Section: Introductionmentioning

confidence: 99%

“…Angles θ 1 and θ 2 are the projection and detection angles respectively. High resolution with a conventional triangulation method [4] requires a system with large θ 1 and θ 2 . Unfortunately, such large angles prevent continuous profile measurements due to severe shadow effects [5].…”

Section: Introductionmentioning

confidence: 99%

Two-directional scanning method for reducing the shadow effects in laser triangulation

Zeng¹,

Matsumoto²,

Kawachi

1997

Meas. Sci. Technol.

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“…Many studies have involved shape and thickness measurements based on either interferometry or laser triangulation [4][5][6][7]. The interferometer is used to measure the thickness of a thin film with high accuracy, but it cannot simultaneously give information on shape variation.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous measurement of the shape and thickness of a dragonfly wing

Zeng¹,

Matsumoto²,

Kawachi

1996

Meas. Sci. Technol.

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A new method has been developed to measure the thickness and shape of a dragonfly wing simultaneously. The innovation in the method, which we call the TSM (thickness and shape measurement) method, is the combination of a heterodyne interferometer and a laser triangulation displacement sensor into one optical system. We confirmed the accuracy of the method by measuring the displacement of a glass plate and the thickness variation generated by a tilted glass plate. The method was then applied to a tilted glass plate and a dragonfly wing. The TSM system has a relative accuracy of 1% in the shape measurement and 1.8% in the thickness variation measurement. The results indicated that the method is very effective in biomechanics studies, such as evaluating the flight performance of dragonflies. In such evaluations, it is essential to measure with high accuracy the variations in both shape and thickness of the wing simultaneously.

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