Yarn Diameter Measurements Using Coherent Optical Signal Processing

Carvalho, Vı́tor; Cardoso, Paulo; Belsley, M.; Vasconcelos, Rosa; Soares, Filomena

doi:10.1109/jsen.2008.2005231

Cited by 29 publications

(35 citation statements)

References 8 publications

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“…Previous studies have confirmed that when using this setup, the output voltage is proportional to the quantity of protruding fibers [6] or to the diameter variation [36] depending on the spatial filter employed.…”

Section: Yarn Hairiness and Diameter Measurement Using Optical Sensorsmentioning

confidence: 57%

“…A parallel plates capacitive sensor was used to detect yarn mass variations [3,33,34], while a coherent optical signal processing technique based on Fourier analysis together with an optical sensor was used to measure yarn hairiness [4][5][6][7]. The measurement of yarn irregularities can also be performed since this system is also capable of characterizing yarn diameter variations [35][36][37]. All of these systems have a sample resolution of 1 mm.…”

Section: The Developed Measurement Solutionsmentioning

confidence: 99%

See 1 more Smart Citation

Yarn periodical errors determination using three signal processing approaches

Carvalho¹,

Belsley²,

Vasconcelos³

et al. 2013

Digital Signal Processing

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Section: Yarn Hairiness and Diameter Measurement Using Optical Sensorsmentioning

confidence: 57%

Section: The Developed Measurement Solutionsmentioning

confidence: 99%

Yarn periodical errors determination using three signal processing approaches

Carvalho¹,

Belsley²,

Vasconcelos³

et al. 2013

Digital Signal Processing

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“…The yarn diameter and hairiness quantification, based on two single photodiodes (S1227-1010BR from Hamamatsu) configured for a 1 mm sample length analysis, uses an optical setup with a low-pass spatial filter, to perform the diameter measurement (eliminating the influence of hairiness, Figure 2a), as well as with a high-pass spatial filter, to perform the hairiness measurement (eliminating the influence of the light which is not blocked by the yarn, Figure 2b) [1][2][3][4]. The coherent optical imaging technique is employed to obtain an optical signal proportional to the amount of hairiness present on the yarn being sampled.…”

Section: Yarn Diameter and Hairiness Quantificationmentioning

confidence: 99%

“…The most commonly used commercial system based on this methodology is the Oasys from Zweigle, which considers a sample measurement field of 2 mm. Also, in this system yarn hairiness can have a significant and undesired influence by reducing the signal received by the optical sensor, consequently leading to diameter measurement with an error by excess [2]. To measure hairiness, the traditional equipment ZT5 (Zweigle) and Tester 5 (Uster) use a dark field optics based technique.…”

Section: Introductionmentioning

confidence: 99%

A comparison of mass parameters determination using capacitive and optical sensors

et al. 2009

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This paper presents a comparison study between the use of 1mm resolution capacitive and optical sensors for the determination of yarn mass parameters. A parallel plate capacitive sensor to determine yarn mass variations and a yarn diameter and hairiness determination solution using optical sensors and integrating optical signal processing based on Fourier analysis are described. As there is a high correlation between yarn diameter and yarn mass, it is possible to determine yarn mass and infer variations in yarn diameter and vice-versa. Moreover, by optically detecting the degree of yarn hairiness, one can quantify its influence on the capacitive sensor mass variation measurements. Here we present the results of a signal processing analysis and statistical description of measurements carried out on a 100% cotton 295 g/km linear mass yarn. We conclude that an accurate yarn characterization can be carried out using optical sensors alone, reducing systems cost, complexity and increasing efficiency.

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“…In our previous studies [1][2][3][4][5][6], two systems were developed, based on the coherent optical signal processing techniques using a single photodiode. One system quantifies the degree of yarn hairiness while the other system was designed to characterize yarn faults based on the average diameter.…”

Section: Introductionmentioning

confidence: 99%