A digital moiré fringe method for displacement sensors

Wu, Jian; Zhou, Tingting; Yuan, Bo; Wang, Li-qiang

doi:10.1631/fitee.1500270

Cited by 10 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Optical linear encoders use various types of optical-scanning principles (e.g., Talbot effect [46,47], Lau effect [48,49], Moiré effect [50][51][52], generalized grating imaging [53][54][55][56], interferometric [57][58][59]) to generate electric-output signals that are used to determine a precise position. Depending on subsequently used electronics, optical encoders can have different interfaces to ensure the reliable exchange of information [60].…”

Section: Metrological Process and Subdivisional Errors In Optical Encmentioning

confidence: 99%

Experimental Investigation of Linear Encoder’s Subdivisional Errors under Different Scanning Speeds

2020

View full text Add to dashboard Cite

Optical encoders are widely used in applications requiring precise displacement measurement and fluent motion control. To reach high positioning accuracy and repeatability, and to create a more stable speed-control loop, essential attention must be directed to the subdivisional error (SDE) of the used encoder. This error influences the interpolation process and restricts the ability to achieve a high resolution. The SDE could be caused by various factors, such as the particular design of the reading head and the optical scanning principle, quality of the measuring scale, any kind of relative orientation changes between the optical components caused by mechanical vibrations or deformations, or scanning speed. If the distorted analog signals are not corrected before interpolation, it is very important to know the limitations of the used encoder. The methodology described in this paper could be used to determine the magnitude of an SDE and its trend. This method is based on a constant-speed test and does not require high-accuracy reference. The performed experimental investigation of the standard optical linear encoder SDE under different scanning speeds revealed the linear relationship between the tested encoder’s traversing velocity and the error value. A more detailed investigation of the obtained results was done on the basis of fast Fourier transformation (FFT) to understand the physical nature of the SDE, and to consider how to improve the performance of the encoder.

show abstract

Section: Metrological Process and Subdivisional Errors In Optical Encmentioning

confidence: 99%

Experimental Investigation of Linear Encoder’s Subdivisional Errors under Different Scanning Speeds

2020

View full text Add to dashboard Cite

show abstract

“…This paper focusses on enclosed-type optical encoders based on the Moiré fringe scanning method [17][18][19], which can measure only single-axial linear displacement. Their construction and scanning principle scheme is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of an Experimental Linear Encoder’s Reading Head under Different Mounting and Dynamic Conditions

et al. 2022

View full text Add to dashboard Cite

The performance of an optical linear encoder is described and evaluated by certain parameters such as its resolution, accuracy and repeatability. The best encoder for a particular application, just like other sensors, is usually selected according these parameters. There are, however, many side effects that have a direct influence on the optimal operation of an encoder. In order to understand how to minimize these harmful effects, a deeper knowledge of an encoder’s performance and a method for determining these factors are necessary. The main aspects of an encoder’s accuracy, resolution and repeatability are briefly reviewed in this paper. Discussed and developed in previous work, the experimental reading head for a Moiré effect-based optical linear encoder is used for the experimental analysis of the influence of different reading head designs on an encoder’s performance under various mounting inaccuracies and dynamic conditions.

show abstract

“…Chemistry [10,13,18], Medicine [11,22,16], or Computer Science [25,1], among many others. In [4, §1.1] Amidror indicates different practical applications for these interference layouts within dissimilar engineering fields: the detection of deformations, measurement of linear displacements or displacements at angles, optical alignment, crystallography, etc.…”

Section: Introductionmentioning

confidence: 99%

High spatial sensitivity method based on moiré interferences derived from a single layer. Case study: The Moiré Pendulum

et al. 2019

View full text Add to dashboard Cite

A digital moiré fringe method for displacement sensors

Cited by 10 publications

References 17 publications

Experimental Investigation of Linear Encoder’s Subdivisional Errors under Different Scanning Speeds

Experimental Investigation of Linear Encoder’s Subdivisional Errors under Different Scanning Speeds

Performance Analysis of an Experimental Linear Encoder’s Reading Head under Different Mounting and Dynamic Conditions

High spatial sensitivity method based on moiré interferences derived from a single layer. Case study: The Moiré Pendulum

Contact Info

Product

Resources

About