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The location of the image spot directly depends on which factor in laser triangulation sensor technique?

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The location of the image spot directly depends on which factor in laser triangulation sensor technique?

(a) Wavelength of laser

(b) Measuring range

(c) Standoff distance

(d) Focal length of lense

The question was posed to me by my school principal while I was bunking the class.

This interesting question is from Laser Inspection in chapter Machine Vision Systems of Engineering Metrology

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Correct answer is (c) Standoff distance

Easy explanation: The location of the image spot in laser triangulation sensor technique depends directly upon the standoff distance between the sensor and the surface of object. If standoff distance changes, it will result in a lateral shift of the spot along the sensor array.

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