As the improvement of people's living standard, more and more is required of the superior quality dairy products. An important indicator that gets more and more attention to measure the quality of dairy products is ingredient content of nutrients in dairy products. One of main component of milk, the concentration of milk fat is of great significance for light scattering measurements. The photomicrograph of the different homogeneous state of milk fat solution with is different concentrations obtained by using high magnification optical microscope. And the particle size distribution of different homogeneous state and different concentrations of milk fat solution are analyzed. Based on the principle of light scattering technique for the detection of milk composition, as well as analysis of the physical and chemical properties of milk fat solution, the energy spectrum, absorption spectrum, the transmittance spectrum of the different homogeneous state and the different concentrations of milk fat solution are determined by the dual-beam spectrophotometer (TJ270-60). Then the effects of fat solution concentration, particle size distribution and homogeneous state on the light scattering intensity are analyzed. Furthermore, it is derived the relationships among milk fat solution concentration with energy, absorption and transmittance based on experimental results. This study will bring a progress in processing quality control of product, and contribute to promote the development of China's dairy industry for bringing practical significance and great economic benefits.
Accurate grading is necessary to ensure the quality of tiles. The quantity of color difference is an important base for grading tiles. For this reason it is necessary to quantify the color differences of tiles. This paper presents a new method of using computer vision technology to measure color differences tiles. It uses CCD image sensors to obtain color images of tiles. The images are then processed with computer to produce the RGB of the color image. The image is then converted from RGB space to CIE1976L*a*b* color space. The character colors are then obtained. The color differences is then determined based on the character colors. A measure system and the color difference computing software were designed. Results from experiments were also given in this paper that color difference values with the different color index are larger than the same color index. The experimental results show that this measuring method can be used for real-time measuring for ceramic tiles.
The opto-contact mini-displacement measuring instrument is mainly for mini-displacement measurement. It not only can measure small geometry size, for example silicon chip thickness, but also can measure some other parameters such as small translation, waviness, diameter run-out, vibration. Combining optical, mechanical, electronic and computer technologies, this instrument can do some work automatically like dynamic sampling, real-time processing, on-line measuring. The instrument is based on laser triangulation, it is composed of a CCD, an optical system and a computer, which can sample and process data with high speed. The measuring principle is described as follows: reflected or scattered light by measured surface are received by CCD, since a good relationship between the offset of image point on CCD and the mini-displacement of object located on a reference plane, a mathematical model can be founded, then the mini-displacement may be calculated according to the offset of image point position on CCD. It's measuring range is +/- 500 micrometers , and precision resolution is +/- 0.1 micrometers .
Generation of scanning structured light is an initiative triangulation-based method for acquiring range data. Unlike traditional projection of paten diaphragm, diode laser, rotating mirror and CCD camera are employed into our device. Diode laser is modulated to emit a modulated slit laser beam. Reflected by rotating mirror, the modulated slit laser beam flashes in different frequencies and generates several new type strip structured images in sequence. The strip structured images are characterized with a new pattern code which has higher resolution, speed and robustness than simply binary code. The new, highly efficient, binary code can shorten the measuring time greatly. In order to raise the resolution, the modulated silt laser beam, reflected by rotating mirror, should scanning all the measured space for eight times. As sweeping the measured space, the scanning step of modulated slit laser beam must be synchronized with rotating mirror and CCD camera. When the scanning is completed, the CCD camera take the images and store them in image-storage timely. All these work coordinately under the control of phase-locked loop. By applying the new scanning technique, a depth image with resolution of 1/256 can be obtained in just 0.3 second.
In this paper, simultaneous frequency, power and beam direction stabilization of transverse Zeeman Laser is reported. The axial mode of He-Ne laser is collapsed into two polarized components perpendicular to each other in a transverse imagination field. By setting up a proper thermal field, taking a frequency difference, between the two composts as the stabilization parameter, the output angle floating is less than 2 X 10<SUP>-4</SUP>, the relative power stability of 0.089% and the qencystability of 4 X 10<SUP>-10</SUP> is obtained.
This paper describes a kind of profiler with the above features. It uses the white-light interfering method and adopts the structure of Micelson interferometer. It includes the light bulb used as the light resource, CCD used as the sensor, PZT providing microscopic translating and the computer sampling and processing data with high speed. When the reference-mirror translating, computing and comparing the modulation M of each point of the surface will give their relative surface height. Then we obtain the surface profile of object to be measured.
In our profiler, software is the key-point. During the course of reference height of each point of the surface by computation and comparison of modulation M and so we can get surface profile. In the course of computation and comparison of modulation M, the ability of software will decide whether our profiler can be applied into practice. In this paper, we did some research work in software, and provided three- frame, five-frame and digited filer processing ways.
This paper reports the experimental results that near 100% peak reflectivity fiber Bragg grating have been fabricated by 248 nm KrF excimer laser irradiated a B/Ge co-doped fiber through a zero-order mulled phase mask and that the growth property of fiber gratings has been monitored using white light source and optical spectrum analyzer during the gratings formation. And we find that the evolution of the reflectivity of fiber gratings with exposure fluence can be perfectly fitted by power-law function of the form R equals cF<SUP>(beta</SUP> ).