Precise Positioning Based on Pixel Differential in Linear Optical Sensor Array

Alsayed, Abdallah; Mahadi, Muhammad Razif

doi:10.1016/j.aaspro.2014.11.003

Cited by 1 publication

(1 citation statement)

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“…Output voltage = K×Light intensity×Integration time 1where, K is a constant and the integration time is the period of photodiode's charging time (Cano-Garcia et al, 2007). One pulse is defined as two successive events of rising and falling edges (Feng, 1996;Alsayed and Mahadi, 2014). In linear grating scale, there is a number of transparent and non-transparent slots, which is called monochrome stripe.…”

Section: Introductionmentioning

confidence: 99%

Development of a Hybrid Ultrasonic and Optical Sensing for Precision Linear Displacement Measurement

Alsayed¹,

Mahadi²,

Waykok³

et al. 2015

J. of Applied Sciences

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This study presents a proposed technique for displacement measurement in linear horizontal motion. The measurement system consists of a lines can sensor with built in illumination system, grating scale and an ultrasonic sensor. Once, the linescan transducer scans the grating scale optically, the displacement of the transducer is measured based on pixel shifting method. Additionally, the role of the ultrasonic sensor is to add the reference position for the linescan transducer and the current position in case of missing the position. The linescan transducer design includes; the illumination source and the division of the grating scale. The accuracy of the measurements is compared to white and infrared lights. After that, the comparison is built based on three scale divisions which are 0.5, 1 and 2 mm. Finally, the accuracy also is compared to different travelling ranges of motion. The displacement measurements of the proposed transducer is evaluated comparatively to Optiv Light Measurement (OLM) device.

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Section: Introductionmentioning

confidence: 99%