Real-time measurement of a thickness of a thin coating by means of sheet laser

Ishikawa, Kazuhiko; Yamano, Hitomi; Asada, Katsuhiko; Iwata, Koichi; Ueda, Masahiro

doi:10.1016/s0143-8166(03)00033-2

Cited by 3 publications

(5 citation statements)

References 3 publications

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“…The largest problem involved in this method was a large fluctuation in the light intensity distribution on the photo-receiver array, which makes an accurate determination of Θ i difficult. 4) However, this problem can be solved by means of the smoothing of many data. Two methods are considered for this smoothing: one is time smoothing, and another is spatial smoothing.…”

Section: Present Methods By Means Of Laminar-like Laser Lightmentioning

confidence: 99%

“…Two methods are considered for this smoothing: one is time smoothing, and another is spatial smoothing. Time smoothing was achieved in the previous method by means of a sheet laser light, 4) which requires a slight shift of the film. This prevents this method from measuring the thickness of a layer essentially in real time.…”

Section: Present Methods By Means Of Laminar-like Laser Lightmentioning

confidence: 99%

“…Table 2 expresses the error between estimated angle Θ i ' and the measured angle Θ i for the previous data. 4,5) The maximum error in Θ i was about 0.5 ˚, which yields an error in h, ∆h/h ≈ 0.06 from equation 9, as an example.…”

Section: Error Due To An Estimation Of θ Imentioning

confidence: 99%

“…We then improved the method so as to measure thickness in real-time by means of a sheet laser light and a CCD array sensor. [3][4][5][6] This method was based on a time smoothing of many reflected lights from slightly different irradiation positions. Thus, the method can measure thickness roughly in real time.…”

Section: Introductionmentioning

confidence: 99%

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A Practical System for Measuring Film Thickness by Means of Laser Interference with Laminar-Like Laser

Feng

Ishikawa

Ibe

et al. 2004

The Review of Laser Engineering

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A practical system for measuring a film thickness based on laser interferometry has been constructed using a laminar-like laser and a CCD camera. The system can measure a film thickness at a measuring frequency of 50 Hz, which enables real-time measurement in practical use. The measurable minimum thickness by means of a blue laser having a wavelength of 405 nm was 2.4 µm, and the maximum thickness was 1.2 mm for a film with a refractive index of 1.4. The measurement error of the film thickness due to the spherical aberration of the cylindrical lens was ∆h/h = 2% at maximum, where h expresses film thickness and ∆h its error amount.

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Section: Present Methods By Means Of Laminar-like Laser Lightmentioning

confidence: 99%

Section: Present Methods By Means Of Laminar-like Laser Lightmentioning

confidence: 99%

Section: Error Due To An Estimation Of θ Imentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Practical System for Measuring Film Thickness by Means of Laser Interference with Laminar-Like Laser

Feng

Ishikawa

Ibe

et al. 2004

The Review of Laser Engineering

Self Cite

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show abstract

“…This parameter is frequently measured in the engineering field of coating preparation and application. To measure various coating thicknesses, researchers and engineers have developed a number of commercially available products and relatively mature methods [11], including mechanical measurements using a micrometer, optical methods based on the multi-beam interference principle [12,13], ultrasonic methods according to measurements of ultrasonic wave propagation time in coatings [14,15], eddy current or magnetic induction methods based on measuring the change in magnetic flux density or impendence by use of alternating magnetic fields [16][17][18], and other such methods [11,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

An experimental technique to measure the thickness of luminescent photoelastic coatings

Hua

Luo

2013

Meas. Sci. Technol.

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Luminescent photoelastic coating (LPC) methods are used to measure the full-field shear strain and its principal direction. These methods apply a liquid LPC onto the surfaces of the structures to be measured. To correct the effects of coating thickness non-uniformity on the quantitative shear strain measurements, a non-contact method is proposed for coating thickness measurements. The proposed method establishes a linear calibration curve between the thickness and the luminescent signal intensity of the test coating. The results show that the linear calibration curve of the intensity and the thickness of the LPC can be obtained by incorporating an appropriate concentration of the luminescent dye into the photoelastic coating. The correlation coefficient of this linear calibration curve is more than 0.999.

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A Novel Wear Detection Method Based on FPC: A Case Study on the Hoisting Cage Sliding Sleeve

Yan

Sun

et al. 2021

IEEE Trans. Instrum. Meas.

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Real-time measurement of a thickness of a thin coating by means of sheet laser

Cited by 3 publications

References 3 publications

A Practical System for Measuring Film Thickness by Means of Laser Interference with Laminar-Like Laser

A Practical System for Measuring Film Thickness by Means of Laser Interference with Laminar-Like Laser

An experimental technique to measure the thickness of luminescent photoelastic coatings

A Novel Wear Detection Method Based on FPC: A Case Study on the Hoisting Cage Sliding Sleeve

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