The principle of linearly polarized light rotation based on Faraday modulation is analyzed. The results indicated that the output amplitude of fundamental frequency component is proportional to optical rotation θ.But the fundamental frequency component, which is less than zeroth-order and second-order frequency component, need be extracted by lock-in amplification technique. The ZF7 glass and TG28 crystal are used as the standard optical rotation and polarization modulation devices. The measurement system of linearly polarized light rotation is built by a lock-in amplifier. When the modulation frequency is 1.45 kHz and modulation magnitude is 0.035 rad, the experimental results show that the method can examine the angle of 6.3×10-8rad.

In this paper, the feasibility to measure PM2.5 by using in-line digital holography is discussed and a corresponding experimental setup is designed. The setup is used in the measurement of standard particles which have approximate diameters with PM2.5. The experimental results are discussed and analyzed too. The results show that in-line digital holography can be effectively applied to the measurement of PM2.5.

The micro-size LED display is made of two-dimensional arrays of high-density light-emitting diodes. It is an all-solid active light-emitting device and has many advantages, including simple system design, high luminous efficiency, fast response and the wide range of operating temperature. In this paper, the design and fabrication of the micro-LED display devices will be reviewed and linked to their applications.

Aiming at the high-speed image acquisition of workpiece surface online detection, a workpiece image high-speed online acquisition method was produced. The quantitative relationship between the positioning accuracy in the high speed online image acquisition,motion blur, exposure time, and the speed of workpiece was analyzed. The effect between the vibration of the workpiece and transfer mechanism was analyzed. An image acquisition sequence was designed. Fast trigger was implemented by photoelectric sensor. The accurate positioning was implemented by using the high accurate time delay module, controlling the motion blur by reducing the exposure time. A high-speed image acquisition system was designed based on the high-speed image acquisition method. The positioning accuracy was less than 0.1 mm,and the motion blur was less than 1 pixel, ensuring the accuracy of the workpiece positioning and image quality. It is advantageous to the quality detection of workpiece surface.

It is difficult to use the conventional method to obtain accurate analytical solution of the Schrodinger equation in the nonlocal nonlinear media. The propagation of Hermite-Gaussian (HG) beams in the strongly nonlocal nonolinear media is discussed with a variational method in this paper. The nonlinear Schrodinger equation can be simplified through expanding the response function in the nonlinear medium. The solution of high-order Gaussian beam soliton is obtained. The beam width of HG beam is unchanged when it propagates in the media by using numerical simulations. The results show that the analytical solution is closer to the numerical solution when the degree of the nonlocality is very large.

In this paper,a method based on machine vision has been presented,which is used to detect the impurities and defects existing in the intake pipe of automobile engine. By establishing the module of Vision and Motion in LabVIEW and Vision Assistant,the method conducts a series of image processing,such as image preprocessing,image morphology processing,image segmentation,senior morphology processing,and develops the detection system for the intake pipe of automobile engine. Practice shows that this detection method is reasonable and the operation is convenient and practical. The visual effect is good. The detection method meets the testing requirements.

In order to accurately get the geometric parameters of an object, we designed a bilateral telecentric optical system to collect images of the object and measured the size of object by digital image processing techniques. We used Zemax to optimize the system, analyzed the aberration of the image and the transfer function of the system. The system had a long working distance which was greater than 74 mm. The field-of-view was 80 mm. The largest distortion was less than 0.11 percent and MTF was larger than 0.3 at 190 lp/mm for full field region of the CCD sensor. We analyzed the stability of the magnification and measurement deviation, and measured the small parts. The deviation was in the required range.

To meet the needs of the current military infrared imaging instrument, we designed a lens for 8~12 μm wave band with uncooled optical passive method. The specific parameter,F is 1, focus is 40 mm, field of view is 16.8°. The design results are achieved within the scope of the -40~65 ℃, as close to the diffraction limitation. The system does not need focus. The athermalization performance is good.

The angle of view of virtual reality head-mounted display is analyzed, optimizing the diameter of the lens and the distance of exit pupil. The spherical and non-spherical lens are designed and their disc of confusion and off-axis aberration is compared by using Zemax. The conclusion is that the non-spherical lens can improve the image significantly. Distortion resulted from the lens is corrected by the software. Non-spherical lens have little distortion and large viewing angle, which can satisfy our needs.

With the rapid development of modern technology, theodolite test device received a lot of attention.This paper introduces the structure of theodolite test device briefly. We designed a theodolite test device which could test dual-band theodolite, and designed the Cassegrain collimator. We utilized Zemax optical design tool to design and analyse the optical system. We determined the aspheric coefficient. In the analysis of the spot diagram, MTF function and energy distribution over the image quality, we determined the feasibility and rationality of the design. Finally based on the analysis,we designed mechanical structure.

The negative differential resistance (NDR) effect of graphene in the p-n junctions and nanoscale barriers is investigated by using transfer-matrix method. The NDR phenomenon in the graphene p-n junctions is not so obvious as that in the conventional semiconductors, because the holes in the negative energy range also contribute to the current due to the Klein tunneling. The NDR location of graphene nanoscale barriers lies on the Fermi energy level. The block of the barrier to the current is more apparent with increasing barrier width, and the NDR effect becomes more obvious.

Based on the mode coupling theory, the effect of titled angle on the characteristics of spectrum of fiber grating is proposed. The numerical modeling method is performed by using the software, OptiGrating.By considering the reflection and the transmission spectra, we find that the central wavelength shifts to the long-wave band, the reflectivity of Bragg wavelength decreases, the cladding mode couplings are enhanced,the transmittance becomes larger,and the group delay decreases intensely with the increase of the titled angles. This conclusion provides a theoretical guidance for the design and optimization of fiber grating.

A measurement system is developed to detect the low-frequency underwater acoustic signal. The clear and high stable diffraction pattern is observed experimentally when the laser beam illuminates on the liquid surface which is modulated by the underwater acoustic signal, the diffraction fringes is asymmetric distribution. The asymmetry of the position and intensity of the diffraction spot were explained with the laser oblique incidence. The experiment is consistent with the theory. The results show that it is asymmetric distribution of the diffraction light field which is modulated by low-frequency underwater acoustic signal.

This paper used smoke to simulate specific aerosol environment. Based on Mie′s theory and Stokes vector, two-ray-path detector explored the change of the polarization state when the different polarized light passed the smoke. There were many factors including the atmospheric aerosol composition, concentration, particle size and the wavelength and polarization state of light source. Mainly the aerosol concentration and light source configuration were studied and measured. The results show that the different mass concentration of the smoke cannot change the horizontal linear polarization state. Degree of polarization of 45° linear polarized light and circular polarized light decreases with the increase of mass concentration of smoke. The change trend of degree of polarization on 460 nm wavelength is similar with that on 556 nm.

In order to make the results of teeth color measurement in the field of dental cosmetic more accurate, this paper has designed a color monitoring instrument, which is based on the colorimetry principle. It used the white-balance adjustment method, technology of integrated digital circuit and design of handheld structure. The source of the instrument was LED light. The core was a mega128 microcontroller. TCS230 programmable color sensor was used to gather the color signal, and C language was used to realize the collection, the storage and the display of the color data. In the experiment of comparison of the measured color with the international standard color card, we analyzed several factors, which affected the accuracy of the measurement. The instrument had a series of advantages, such as high measuring accuracy, high stability, low-power consumption and easy to carry. In short, the instrument has promising applications and broad market.

For light-arm infrared optical sight stability testing requirements, we design a two-dimensional electrical-turntable platform based on Newton′s reflex infrared system. Electrical control was established based on CATIA three-dimensional model of two-dimensional precision turntable model. The two-dimensional precision turntable model was using small two-dimensional U turntable structure, driven by a DC servo motor directly. 24-level axial angle encoder was used for angle measurement. Through finite element analysis software PATRAN on the turntable platform, key components of the thermodynamic analysis and modal analysis were conducted, obtaining the turntable stress distribution nephogram. The results show that the design scheme is feasible and reasonable.

The fluorescence microscope is one of the most universal medical optical instruments and is widely applied in the scientific research, pathology and examination in the hospitals. Light source is an essential component of the fluorescence microscope. This paper explains how to use the LED as the light source of the fluorescence microscope instead of the traditional high-pressure mercury lamp and the way of transforming digital cameras into CCD imaging device, such that the existing fluorescence microscope has been greatly improved and reach to a state-of-the-art level of modern fluorescence microscope.

The existence of gravitational wave is the greatest predictions of Einstein’s theory of general relativity. The detection of gravitational wave is one of the important frontier sciences of physics. The gravitational wave astronomy based on the detection of gravitational wave is a new interdisciplinary science. It is a big complimentary and expanding of traditional electro-magnetic astronomy. As a high precision optical instrument and the key equipment of gravitational wave astronomy,laser interferometer gravitational detectors are developing very quickly in the world. It opened a new era of gravitational wave detection. The basic optical structure of laser interferometer gravitational detector and its main parameters have been discussed. The characteristics of mirrors and the measurement method for their parameters have been introduced.