Optical Glass Metrology â Techniques / Limitations - Owens Design

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<strong>Optical</strong> Time-of-Flight Technique Principle: Laser light source generates a pulse which travels to object and is reflected back to receiver. Time from emission to reception is measured at high speed. Range is a function of ½ the time divided by the time constant (299,792,458 m/s). Ambiguity interval can be eliminated by phase modulation. Also called Time Domain Reflectometry (TDR) and LIDAR (when executed in a scanning technique like the electro-magnetic equivalent RADAR) Advantages: - Simplicity of concept - Low Cost Solution for Moderate Resolution Features - High signal to noise ratio (ambient light noise) - Measurement of high aspect-ratio holes - Measurement from low to high reflectivity - Measurement of transparent objects <strong>Limitations</strong>: - Speed –of-light constant - Detection speed and response time over short distances (1 micron = 6.0 x 10 -14 seconds) - Mechanical Scanning for Single Point - X-Y Resolution for Arrayed Sensor : SICK AG: : BU02 side session: high end displacement Patrick Nutz 19.03.2009 10
LaserScanner with rotating Mirror Detection and Measurement of Object Distance and Size Example of Occlusion : SICK AG: : BU02 side session: high end displacement Patrick Nutz 19.03.2009 11
Page 1 and 2: Optical Glass Metrology - Technique
Page 3 and 4: Limitations of Optical Measurement
Page 5 and 6: Laser Triangulation Advantages : Si
Page 7 and 8: Detection of the Glass Plates Inter
Page 9: Glass Thickness Measurement with on
Page 13 and 14: Confocal Laser Point Sensor : SICK
Page 15 and 16: Chromatic Confocal Measurement : SI
Page 17 and 18: Principle of operation of an AutoFo
Page 19: : Thank you for your attention.

Optical Glass Metrology â Techniques / Limitations - Owens Design

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Optical Glass Metrology â Techniques / Limitations - Owens Design