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Turbocharger and gearbox were widely used in the precision machinery manufacturing industry. The dimensional accuracy of Turbo parts and stud standard parts was an important guarantee for the assembly accuracy of Turbo parts and gearbox, among which coaxiality was a key parameter for the dimensional accuracy of Turbo parts and stud standard parts. According to the demands of coaxiality measurement for turbine components and stud standard parts, a set of checking fixture was developed, and a software based on LabVIEW was built for the measurement. The coaxiality of stud standard M12 was measured by experiment and the uncertainty of measurement was evaluated. The experimental results show that the coaxiality error obtained from the four measurements is 6.3–6.5 μm, and the extended uncertainty reaches 2.6 μm. The results show that the developed coaxiality measurement system is suitable for the high precision measurement of the coaxiality of turbine parts and stud standard parts.

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Phase retrieval is to recover the original phase information by using the intensity information obtained from observation. Transport of intensity equation (TIE), as a traditional non-interference phase retrieval technique, can compute the losing phase information from only a minimum of two intensity measurements at closely spaced planes by solving the equation. This method usually requires the acquisition of intensity images by moving the object to be tested or CCD, which inevitably results in mechanical errors. A new phase retrieval method called chromatic dispersion-hybrid phase retrieval(CD-HPR) is proposed. The object is imaged at the same position by setting different wavelengths of light after passing through the single-lens system, in-focus and defocus intensity images are obtained without mechanical movement, and the initial phase information of an object is calculated from the phase retrieval technique based on TIE by combining the relationship between the defocus amount and the wavelength. Next angular spectrum iteration is used to improve the initial phase information. In this simulation, the RMSE between the phase recovered by this method and the original phase is 0.1076. At the same time, the phase of the lens array was restored by experiment. The error between the experimental result and the real parameter is 3.4%, which proves the correctness and effectiveness of the proposed method. This method extends the limitation of the traditional method that requires the light source to be monochromatic and improves the calculation accuracy.

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Picosecond infrared multi-wavelength Raman generator which adopted multi-pulse pumped KGW scheme was reported. A mathematical model was developed to investigate the effect of multi-pulse burst pumping regime on the vibrational mode of the Raman active molecule. The simulated results show that the response oscillation of the Raman active molecule to the multi-pulse burst pumping regime is more active and durable compared with the traditional single pulse pumping regime, which promotes the weakened molecule oscillation to return the natural frequency multiple times. The enhancement effect is beneficial to improve the Raman gain, reduce the Raman threshold, and increase the Raman conversion efficiency. During the experiment of picosecond multi-pulse pump KGW Raman crystal, the three-pulse burst pumping regime improves the Raman gain more than two times, reduces the threshold of stimulated Raman scattering more than 50%, and increases the Raman conversion efficiency more than 16% for 768 cm–1 Raman mode and 22% for 901 cm–1 Raman mode. Based on the three-pulse burst pumping regime, a 1 kHz mJ-level picosecond infrared multi-wavelength Raman generator was designed, which achieved the pulse energy of 1.39 mJ, the maximum Raman conversion efficiency of 29.6% for the 768 cm–1 vibrational mode of KGW, and the pulse energy of 1.38 mJ, the maximum Raman conversion efficiency of 25.7% for the 901 cm–1 vibrational mode of KGW. In addition, the Raman laser can radiate up to eight infrared Raman lines simultaneously for both the two vibrational modes of the KGW crystal, which covers the range of 800–1 700 nm.

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In view of the thermal damage law and mechanism of monocrystalline silicon for millisecond pulsed laser, the temperature of monocrystalline silicon irradiated by millisecond pulsed laser is measured by high precision point temperature meter and spectral inversion system. Then the temperature evolution process is analyzed. Also, the temperature state during the whole process of thermal damage of monocrystalline silicon irradiated by millisecond pulsed laser and the corresponding damage structure are studied. The results of this study show that the peak temperature of laser-induced monocrystalline silicon increases with the increase of energy density when the pulse width is fixed, When the pulse width is between 1.5 ms-3.0 ms, The temperature decreases with the increase of pulse width. Temperature rise curve shows inflection point when it is close to the melting point (1687 K), the reflection coefficient is from 0.33 to 0.72. During the gasification and solidification stages, it also shows the gasification and the solidification plateau periods. Thermal cleavage damage of monocrystalline silicon precedes thermal erosion damage. Stress damage dominates under low energy density laser irradiation, while thermal damage dominates under high energy density laser irradiation. The damage depth is proportional to the energy density and increases rapidly with the increase of the number of pulses.

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2020, 49(7): 20201018.   doi: 10.3788/IRLA20201018
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2020, 49(7): 20201019.   doi: 10.3788/IRLA20201019
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2020, 49(7): 20201020.   doi: 10.3788/IRLA20201020
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2020, 49(7): 20201021.   doi: 10.3788/IRLA20201021
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2020, 49(7): 20201022.   doi: 10.3788/IRLA20201022
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2020, 49(7): 20201023.   doi: 10.3788/IRLA20201023
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2020, 49(7): 20201024.   doi: 10.3788/IRLA20201024
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2020, 49(7): 20190495.   doi: 10.3788/IRLA20190495
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2020, 49(7): 20190520.   doi: 10.3788/IRLA20190520
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2020, 49(7): 20190507.   doi: 10.3788/IRLA20190507
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2020, 49(7): 20190548.   doi: 10.3788/IRLA20190548
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2020, 49(7): 20190456.   doi: 10.3788/IRLA20190456
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2020, 49(7): 20190453.   doi: 10.3788/IRLA20190453
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2020, 49(7): 20200112.   doi: 10.3788/IRLA20200112
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2020, 49(7): 20190461.   doi: 10.3788/IRLA20190461
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2020, 49(7): 20190512.   doi: 10.3788/IRLA20190512
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2020, 49(7): 20190492.   doi: 10.3788/IRLA20190492
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2020, 49(7): 20190518.   doi: 10.3788/IRLA20190518
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Non-contact detection of internal micro-defects of the micro-electro-mechanical system and minimechanism required a high accuracy and strong penetration test. The current detection methods were difficult to achieve high precision while also having strong penetrating power. In response to the above problems, a composite system of ultrasonic detection and digital holography imaging was designed. Ultrasonic detection technology had strong penetrating power, and digital holographic imaging had higher resolution. The composite system designed included a near-field ultrasonic subsystem, an digital holographic subsystem and a synchronous control subsystem. In the near-field ultrasonic subsystem, the generated near-field ultrasonic wavefields passed through the internal defect of the sample and formed the surface ultrasonic wavefield on the surface of the sample. The digital holographic subsystem mainly measured and analyzed the transient morphology of the surface ultrasonic wavefields, and the internal defect information contained in the surface ultrasonic wavefield could be analyzed. The experimental results show that the system can measure the transient 3D topography of the ultrasonic wavefield by analyzing the ultrasonic wavefield, and can effectively detect internal defects of 50 μm.

2020, 49(7): 20190522.   doi: 10.3788/IRLA20190522
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2020, 49(7): 20190524.   doi: 10.3788/IRLA20190524
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2020, 49(7): 20200012.   doi: 10.3788/IRLA20200012
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2020, 49(7): 20190544.   doi: 10.3788/IRLA20190544
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2020, 49(7): 20190433.   doi: 10.3788/IRLA20190433
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2020, 49(7): 20200212.   doi: 10.3788/IRLA20200212
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2020, 49(7): 20190567.   doi: 10.3788/IRLA20190567
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2020, 49(7): 20190519.   doi: 10.3788/IRLA20190519
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The zoom fish-eye lens had the characteristics of much larger field-of-view angle, much larger relative aperture, and much larger anti-far ratio. In the work described in this paper, the initial structure of a fish-eye lens with fixed focal length was firstly designed using the theory of a plane symmetric optical system. And then the initial structure components of the fish-eye lens were divided into two groups, the former-group and the rear-group, and then the entire zoom fish-eye lens system was optimized using Gaussian optical theory. Finally, a zoom fish-eye lens system with good imaging quality was obtained. This fish-eye lens system had a field-of-view angle of 180° with an 8 mm short focal length and a field-of-view angle of 90° with a 16 mm long focal length. Its relative aperture was 1/3.5. The design results show that the modulation transfer function of this zoom lens system at different focal lengths is no less than 0.45 when the spatial frequency is 50 lp/mm. This zoom fish-eye photographic objective lens had higher imaging quality than other zoom fish-eye lenses.

2020, 49(7): 20200008.   doi: 10.3788/IRLA20200008
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2020, 49(7): 20190469.   doi: 10.3788/IRLA20190469
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2020, 49(7): 20190490.   doi: 10.3788/IRLA20190490
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2020, 49(7): 20190479.   doi: 10.3788/IRLA20190479
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2020, 49(7): 20190452.   doi: 10.3788/IRLA20190452
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Oceanic turbulence is an important factor to restrict the application of underwater optical communication. Phase screen method is a simple and effective way to simulate the propagation process of complex beams through turbulence. The constraints of parameter setting for phase screen simulated oceanic turbulence based on the sampling principle and turbulence effects were firstly discussed here. Furthermore, the theoretical expressions of propagation characteristics of Gaussian beam through oceanic turbulence from weak to strong fluctuation regime were derived. Our goal in this research was to testify the validity of phase screen method in oceanic turbulence by comparison of major statistical characteristics of Gaussian beam propagating in oceanic turbulence simulated by phase screen method and the theoretical expressions derived. Results show good match between simulation results and theory formulas for long exposure beam radius and centroid displacement under different turbulence conditions, as well as the scintillation index under weak fluctuation regime. However, results show significant mismatch between numerically estimated and theoretically predicted values for the on-axis scintillation index in strong fluctuation regime.

2020, 49(7): 20200154.   doi: 10.3788/IRLA20200154
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2020, 49(7): 20190505.   doi: 10.3788/IRLA20190505
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2020, 49(7): 20200170.   doi: 10.3788/IRLA20200170
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