In this paper, the combination of spontaneous and stimulated Raman spectroscopy is used to further explore the relationship between OH stretching vibration and hydrogen bond in water under atmospheric pressure and dynamic high pressure and present the change process of hydrogen bond structure in liquid water from a microscopic point of view. The OH spontaneous Raman spectrum of water is deconvoluted into two characteristic peaks, which are 3213 cm-1 and 3436 cm-1 respectively. They belong to the OH stretching vibration under the action of strong hydrogen bond and weak hydrogen bond. In stimulated Raman scattering, under the action of plasma shock wave, the bond length of hydrogen bond is shortened, resulting in the elongation of OH bond length. Corresponding to the enhancement of hydrogen bond, the OH stretching vibration of water is weakened, and the Raman peak moves to the low wave number direction to 3396 cm 1. In the stimulated Raman scattering experiment, due to the exponential enhancement of the output signal, the weaker vibration mode will be masked by the stronger vibration mode. Therefore, only one vibration mode is observed in the spectrum. In this paper, the changes of corresponding hydrogen bond structure under spontaneous and stimulated Raman scattering are compared and analyzed. The research results are helpful to further explore the microphysical mechanism of liquid water molecular interaction and provide a reference for the mechanism research in related fields.
The prism is one of the most important optical components in optical system, this paper analyzes the difficulties in processing technology. The angle accuracy of prisms can be improved by using slotted flat die, metal optic tooling, glass optic tooling and optic bonding tools. In this paper, the method of obtaining angle precision of prism with different batch and different precision grade is given, it has certain guiding significance for prism machining.
A multi-spectral imaging system dedicated to precision agriculture is built. In order to realize the purpose of using diffractive optical elements as the spectroscopic system to conduct spectral imaging of the target object by means of phase modulation, the narrowband filter in the camera is designed in this paper. K9 was selected as the substrate material, Ta2O5 and SiO2 as the film materials with high and low refractive index. According to the basic theory of optical thin film and combined with the design software of Essential Macleod film system, the design and simulation analysis of the film layer were realized. Within the range of 350nm~750nm, R<1% at 380nm, and R>99% at 350nm~378nm and 381nm~750nm when the ray is vertically incident, meet the technical requirements. For crops, different states have different "color information". By obtaining the spectrum of crops during the growth process, key information such as growth, diseases and insect pests, fertilizer and pesticide application can be quickly, accurately and efficiently judged. This research has important practical significance.
The cultivation of independent college students is the development of applied talents and the strength of students’ innovative ability. This requires teachers to make better use of the resources of the school, to develop students' ability with greatest possible and to encourage students to learn independently and personality development. We can carry out multi-discipline curriculum design practice after the study of related disciplines in order to make students have a more in-depth understanding and learning of the professional courses. In this paper, we will research on curriculum design based on the combination of Laser Measurement Technology and Digital Image Processing.
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