Fiber optics low-coherence IR interferometry for defense sensors manufacturing

Walecki, W. J.; Szondy, Fanny

doi:10.1117/12.818381

Cited by 5 publications

(5 citation statements)

References 11 publications

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“…The problem of light polarization for these kind of interferometers is well known. A standard solution is given by a different scheme, the auto-correlator [12], shown in Figure 9. This scheme measures the beating frequencies between the reflection of the two surfaces, instead of the ones between a mirror and a single surface.…”

Section: Methodsmentioning

confidence: 99%

Interferometric Instrument for Thickness Measurement on Blown Films

Norgia

Pesatori

2021

Photonics

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Real-time measurement of plastic film thickness during production is extremely important to guarantee planarity of the final film. Standard techniques are based on capacitive measurements, in close contact with the film. These techniques require continuous calibration and temperature compensation, while their contact can damage the film. Different optical contactless techniques are described in literature, but none has found application to real production, due to the strong vibration of the films. We propose a new structure of low-coherence fiber interferometer able to measure blown film thickness during productions. The novel fiber-optic setup is a cross between an autocorrelator and a white light interferometer, taking the advantages of both approaches.

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Section: Methodsmentioning

confidence: 99%

Interferometric Instrument for Thickness Measurement on Blown Films

Norgia

Pesatori

2021

Photonics

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“…The length of the arms of the Michelson interferometer is adjusted by using a set of calibration block gauges often used in mechanical engineering application [6]. The detailed calibration procedure is described in another of our paper presented at this conference [7].…”

Section: Spectrometer Calibrationmentioning

confidence: 99%

New spectrometer for non-medical high-precision frequency domain optical coherence tomography

Walecki¹

2023

Next-Generation Spectroscopic Technologies XV

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“…Ix ðÞ¼Sx ðÞ ⊗ δ x ðÞ þ δ x AE nd ðÞ ðÞ ½ (14) Then, the signal was passed through a high-pass filter that eliminates the DC component, obtaining a signal as indicated in Figure 8, which can be expressed as…”

Section: Detection and Processingmentioning

confidence: 99%

“…Among the industrial metrological applications, the following can be mentioned: the measurement of very thin thicknesses in semiconductor wafers [9,10], the characterization of surfaces [11,12], the control of thickness in the coating of pills in the pharmaceutical industry [13], and others. OCT systems based on fiber optics are particularly suitable for use in industrial [14], hostile (electromagnetic interference, radioactive, cryogenic, or very high temperatures) [15], or difficult-to-access environments [16]. Moreover, optical fiber-based OCT devices can take the advantage of beam stability and lower price of IR components used in optical communications.…”

Section: Introductionmentioning

confidence: 99%

OCT in Applications That Involve the Measurement of Large Dimensions

Russo¹,

Morel²,

Torga³

et al. 2020

Optical Coherence Tomography and Its Non-Medical Applications

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The application of optical coherence tomography (OCT) technique is not very common when measuring large dimensions is required. This type of measurements can be critical to achieve satisfactory results in the manufacturing process of precision parts. Components and structures ranging from submillimeter to several centimeters size can be found in many fields including automotive, aerospace, semiconductor, and data storage industries to name a few. In this chapter, an interferometric system based on the swept source optical coherence tomography (SS-OCT) technique, which has a wide measurement range and good axial resolution, is presented and its constituent parts are analyzed. The scheme includes a self-calibration stage based on fiber Bragg gratings (FBGs) that allows monitoring the spectral position of the light source in each scan, having the advantage of being a passive system that requires no additional electronic devices. Several applications of the system are described, including measurement of distances up to 17 cm, characterization of multilayer transparent and semitransparent structures, simultaneous determination of thickness of the wall, internal and external diameter of glass ampoules or similar containers, thickness measurements in opaque samples or where the refractive index is unknown, etc.

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Fiber optics low-coherence IR interferometry for defense sensors manufacturing

Cited by 5 publications

References 11 publications

Interferometric Instrument for Thickness Measurement on Blown Films

Interferometric Instrument for Thickness Measurement on Blown Films

New spectrometer for non-medical high-precision frequency domain optical coherence tomography

OCT in Applications That Involve the Measurement of Large Dimensions

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