Frequency sweeping interferometry for robust and reliable distance measurements in harsh accelerator environment

Sosin, Mateusz; Mainaud-Durand, H; Rude, Vivien; Rutkowski, Jarosław

doi:10.1117/12.2529157

Cited by 4 publications

(9 citation statements)

References 7 publications

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“…The lowest noise floor is visible for spline interpolation (Fig. 8d), which confirms the assumption that spline methods should provide the lowest approximation errors [1]. Spline interpolation, such as cubic spline interpolation, is widely used for unevenly spaced data.…”

Section: Data Linearization (Resampling)supporting

confidence: 69%

“…6b., significant effort was put into the front-end circuitry integration, resulting in improved performance. For instance, when comparing measurements from a hydrostatic levelling sensor (HLS) measurement (weak optical signals reflected from a water surface [1]), the beat frequency peaks are much clearer and visible. The SNR for HLS measurements using the prototype in Fig.…”

Section: Light Detection Amplification and Adcmentioning

confidence: 99%

“…The Fourier-based frequency sweeping interferometry (FSI) and the classical FSI use the same interferometer layout, which is similar to the Michelson interferometer [1]. However, the single frequency laser in the classical Michelson interferometer is replaced by a sweeping laser source (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The simplified optical architecture of an interferometer (Fig. 1b) is commonly used [1], where a fibre ferrule tip serves as a semi-transparent reference mirror, which reflects ~4% of the incident light, thus forming the reference arm of the interferometer. The remaining ~96% of the light is emitted towards the reflective target, using additional collimating optics.…”

Section: Introductionmentioning

confidence: 99%

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Distance measurement error sources in Fourier-based frequency sweeping interferometry using a gas cell for laser frequency sweep speed determination

Sosin,

Gonzalez Cobas,

Isa

et al. 2023

ODS 2023: Industrial Optical Devices and Systems

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Fourier-based frequency sweeping interferometry (FSI) is an interferometric technique, which offers absolute distance measurement based on the detection of interference beat frequencies of reflected signals. Through the multiple beat frequencies detected, Fourier-based FSI performs robust and simultaneous measurements of absolute distances to multiple targets. This measurement technique is less sensitive to the variations in reflected optical signal intensity because frequency peaks in the Fourier spectrum are easily retrievable for weak interference signals without any significant degradation of the measurement accuracy. Moreover, the tolerance for variations in the reflected light intensity makes Fourier-based FSI useful for distance measurements using various reflector types, even those with low reflectance materials. The drawback of Fourier FSI method is the need to use complex and time-consuming computations, consisting of fast Fourier transform, laser sweep speed estimation and data resampling, to correct the non-uniform sweep speed of the laser. The complexity of the computations and the quality of the measurement results are also strongly dependent on the setup of the FSI components. In addition, the detected beat frequencies are highly impacted by the target retroreflector movements or vibrations, which introduce Doppler shifts to the detected frequencies that causes drift effects. This paper describes the distance measurement error sources of Fourier-based FSI interferometer components and assesses their impact on the measurement uncertainty. All analyses are based on a CERN FSI interferometer setup, operating in Cband optical sweep frequency range, with a sweep speed of 2000 nm/s, equipped with a hydrogen cyanide gas cell for frequency tracking purposes.

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Section: Data Linearization (Resampling)supporting

confidence: 69%

Section: Light Detection Amplification and Adcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Distance measurement error sources in Fourier-based frequency sweeping interferometry using a gas cell for laser frequency sweep speed determination

Sosin,

Gonzalez Cobas,

Isa

et al. 2023

ODS 2023: Industrial Optical Devices and Systems

Self Cite

View full text Add to dashboard Cite

show abstract

“…The concept involves the use of FSI for measurement of the more accuracy-demanding part of the robot trajectory. However, the integration of a FSI system has some drawbacks, such as limited signal intensity, the need for high-bandwidth hardware integration and concerns regarding eye safety 14 .…”

Section: Methodsmentioning

confidence: 99%

High-accuracy robotic metrology for precise industrial manipulation tasks

Isa,

Khanesar,

Leach

et al. 2023

Automated Visual Inspection and Machine Vision V

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The majority of industrial production processes can be divided into a series of object manipulation and handling tasks that can be adapted for robots. Through significant advances in compliant grasping, sensing and actuation technologies, robots are now capable of carrying out human-like flexible and dexterous object manipulation tasks. During operation, robots are required to position objects within tolerances specified for every operation in an industrial process. The ability of a robot to meet these tolerances is the critical deciding factor that determines where the robot can be integrated and how proficient the robot can carry out high-precision tasks. Therefore, improving the positioning accuracy of robots can lead to new avenues for their integration into production industries. Given that tolerances in manufacturing processes are in the order of tens of micrometres or less, robots should guarantee high positioning accuracy when manipulating objects. The direct method of ensuring high accuracy is by introducing an additional measurement system(s) that can improve the inherent joint-angle-based robot position determination. In this paper, we present a high-accuracy robotic pose measurement (HARPM) system based on coordinate measurements from a multi-camera vision system. We also discuss the integration of measurements obtained by absolute distance interferometry and how the interferometric measurements can complement the vision system measurements. The performance of the HARPM system is evaluated using a laser interferometer to investigate robotic positions along a trajectory. The performance results show that the HARPM system can improve the positioning accuracy of robots from hundreds to a few tens of micrometres.

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Frequency scanning interferometry based deformation monitoring system for the alignment of the FCC-ee machine detector interface

Watrelot

Sosin

Durand

2023

Meas. Sci. Technol.

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In a particle accelerator, two particle beams are accelerated and collided at one or several physicsdetectors. The machine detector interface (MDI) is the place where the accelerator ring is linkedto the physics detector. It is the area where the alignment requirements are the most stringent, andthe MDI of the lepton version of the Future Circular Collider (FCC-ee) is no exception. It willimplement a complex design and alignment requirement for typical components in the MDI areof the order of 30 m. Until now, no working solutions have been proposed for the alignment ofsuch MDI. In this contribution, two different systems are studied: the Surveillance d’Ouvrages parFibre Optique (Structural Monitoring by Optical Fibers, SOFO) and the in-lined multiplexed anddistributed frequency scanning interferometry (FSI). Both systems allow individual and simultaneousdistance measurements of multiple portions along a fiber, and a new system using the FSI technologyis proposed for the alignment monitoring. Using a network of helical shaped fiber allows themeasurement of deformations if a sufficient amount of fibers is placed on the cylinder. With a sensormeasurement accuracy of 1 μm, 3D coordinates of points at the end of a 4 m long and 0.25 m radiuscylinder (FCC-ee MDI dimensions) can be determined at an accuracy under 5 μm. This system willprovide a link between the alignment of the final focusing quadrupoles and the rest of the machine.

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Frequency sweeping interferometry for robust and reliable distance measurements in harsh accelerator environment

Cited by 4 publications

References 7 publications

Distance measurement error sources in Fourier-based frequency sweeping interferometry using a gas cell for laser frequency sweep speed determination

Distance measurement error sources in Fourier-based frequency sweeping interferometry using a gas cell for laser frequency sweep speed determination

High-accuracy robotic metrology for precise industrial manipulation tasks

Frequency scanning interferometry based deformation monitoring system for the alignment of the FCC-ee machine detector interface

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