Session Index

Historically, the periscope is the surveying subsystem of an indigenous submarine to observe objects above the sea while the submarine remains submerged. This paper reports the specification of a periscope in the past and analyzed the current system and a preliminary modeling result will also be evaluated.

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A gradient-intensity axial beam with properties of a narrow lateral spot and the gradient intensity along the optical axis is applied to the confocal profilometer for the surface-profile inspection. The experimental implementation of the gradient-intensity axial beam of pseudo Bessel beams is carried out and compared with the theoretical results.

 

We demonstrated the capability of 25 Hz vibration detection made by utilizing a motor on an optical fiber at a distance of 50 kilometers, utilizing a fiber Bragg grating sensor with an operating wavelength of 1544.9 nm.

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We proposed an artificial neural network-integrated with a fiber Bragg grating (FBG) system for the accuracy of strain measurement. From the result, the artificial neural network has good performance comparing to the Gaussian fitting method.

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An optical setup that is equivalent to an electrically rotating polarization element (ERPE) is proposed. The principal axis of the ERPE can be changed by applying an electric signal on an electro-optic modulator of this setup. This ERPE can be applied for a linear phase retarder with arbitrary phase retardation.

 

In this study, Zemax is used to simulate the human eye and analyze the difference between the front and the rear of the frog mirror with a third-order aspheric lens. The effective focal length is used to optimize the parameters of the first and second sides of the frog mirror to achieve better imaging quality and clearer imaging results. The different refractive between water and air, is discussed in order to reduce the discomfort of the wearer's vision due to the difference in degrees in the water and in the air caused by the power of the frog mirror.

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A sinusoidal intensity modulated light source as a test signal and incident to a spectrometer. In order to separate the tested spectrum from a stray light mixed spectrum, the three-parameter sine fitting algorithm was used to calculate the amplitude intensity corresponding to the specified modulation frequency. The extracted test spectral signal was not affected by stray light.

 

Time-of-flight detection at eye-safe wavelength of 1550nm is demonstrated for LiDAR system in self-driving vehicles. We use a pulse laser diode as the light source, an avalanche photodiode as the signal receiver, and multiple diffused objects with different reflectivity to demonstrate the LiDAR system. Time-of-flight analysis is used to measure the distance between the source and the target. Indoor and outdoor distance up to 65m of single target is demonstrated.

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In this study, the liquid lens was integrated into the AOI imaging system. Because the liquid lens can quickly adjust the focal length, we apply it to the image focal length scan, and combine the sharpness algorithm to calculate the image sharpness curve. Experimental results, this system architecture and sharpness algorithm, can find the best focus position in the imaging system.

 

In this study, we use a birefringent polymer PEN immersed in ethanol solution to monitor the volatilization phenomenon based on a polarimetric spectral interference measurement scheme. Since the refractive index of ethanol solution change as well as volatilization in contact with air, the dip wavelength shift gradually due to the condition change of interference phase. The measurements indicate a sensitivity to RI changes of 7.7×104 nm/RIU, resulting in a detection limit of about 1.3×10-5 RIU.

 

A BBO optical angle sensor was demonstrated successfully for the non-contact fluidic concentration measurements in a common path heterodyne interferometer. The achievable concentration and RI measurement resolutions are 45 ppm and 7.2×10-6 RIU, respectively.

 

This paper proposes a Differential Interference Contrast Microscope (DICM), which uses a liquid crystal cell as a shearing element between the objective lens and the sample, and uses a quarter wave plate with a polarization camera to introduce the phase. Compared with the traditional DICM,The system has the advantage of not requiring mechanical action to switch the shearing direction and can complete the phase shift instantly. It is superior to previous architectures in terms of time cost, operational complexity and applicability.

 

We use a simple polymer dispersed liquid crystal (PDLC), consisted of 30% LC and 70% commercially available UV-curable epoxy, connected with free-standing rotary triboelectric nanogenerator (r-TENG) to evaluate the behavior of LC inside polymer matrix by synchronously recording the triboelectric voltages and currents. The experimental results revels that the applied current, not voltage, determines the performance of PDLC devices. Under the same supplied currents from r-TENG, the performance of one piece PDLC is the same as 9 pieces of series connected PDLCs.

 

This paper mainly describes the use of MTF and WFE as the evaluation function of the optical telescope during the manufacturing and assembly process to control the performance of the optical system step by step. By tolerances allocations in each stage, the tolerance margin and the success criteria is clearly understood, the critical path in the overall process could be easily shown. It is much better and confident for the project management. If every process stage could follow the budget allocation, the final performance of the overall optical system should be expected to meet the requirements.

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The color vision inspection system under the full-color gamut spectrum can be used for human color discrimination. This advanced design has the characteristics of quick test-time control, humanized operation design, and sensitive, accurate and robust measuring results for the degree of color blindness by using about 100 lux at white-light illuminance.

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In this case study, the nonrotationally symmetric systematic error of testing a concave hyperbolic mirror is presented. Based on the Interferometric test with rotational shears technique, the nonrotationally symmetric systematic error are analyzed and compared with both of the multi-angle averaging method and Zernike terms analysis method.

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In this paper, a large-area multipoint sensor using machine learning (ML) for a highly reliable fiber Bragg grating (FBG) sensor system is proposed. The experimental results prove that ML can provide the best sensing path from multiple different sensing paths in the network.

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This paper uses 5 million original test data for comparison and analysis, uses the
random forest method in machine learning (ML) to adjust the test machine parameters and
achieves the best UPH (Units per hour), and passes the streamlined man-machine guidance
surface synchronization verification , And then use the adjustment of the optical fiber detector
to optimize the optimal setting value of the production machine parameters and the level of
UPH

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This article introduces a profiler equipped with a hexapod, a moving stage, a rotating spindle, and an autocollimating probe. This setup measures directions of points in polished surface instead of relative sag on these surface.

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A phase-shifted fringe projection profilometer is developed to monitor the surface profile of the fabricated layers in a metal power bed fusion manufacturing system. Using structured light illumination with digital projector, a series of the distorted fringes projected on the samples are recorded by cameras. Distorted fringe images are decoded to obtain the phase information, unwrapped by the proposed phase-offset approach and reconstruct the surface profile proportional to the unwrapped phases. The optical system are designed and analyzed theoretically, which show the possibility to achieve surface contour imaging sub-millimeter axial precision and to realize real-time surface profile monitoring.

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We combine the design of spot-defect and azimuthal symmetry breaking into a resonator to generate optical vortices. This spiral-phase defect structure is implemented by reflective spatial light modulator and lead to direct lasing of topological charge tunable vortex lasers confirming the theoretical predictions by modal decompositions.

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