The Research On Optical Spin Structure Regulation And Displacement Sensing Technology

Displacement Sensing Technology is a way to get detailed displacement information by measuring physical quantities based on the corresponding relationship between measurable physical quantities and tiny displacement.According to the types of physical quantities measured,Displacement Sensing Technology is mainly classified into two types: electrical measurement and optical measurement,which can be selected as per different requirements in practical applications.For electrical measurement,it can be measured by potential,capacitance and inductance,while the optical measurement can be used by amplitude,phase and polarization.The optical measurement is of some innate advantages instead of electrical measurement in actual field for superior accurate displacement sensing technology,which are reflected in unlabeled measurement,strong resistance to electromagnetic interference,high sensitivity,etc.Therefore,the development of displacement sensor based on optical measurement will become one of the main directions for future research.So far,the displacement sensing of optical measurement is mainly realized by the amplitude or phase of light,such as classical Michelson interferometer and Laser interferometer.Recently,some researchers have also studied the ultra-high precision of displacement sensing technology by constituting special phase and special scattered.This development of the technology indicated a wide application space for structural light field with special optical properties.The spin structured light field mentioned in this paper can build a special light field of local linear spin distribution by the interaction between spin angular momentum(SAM)and orbital angular momentum(OAM)in the light field.This study involves the practical application development of angular momentum of light,especially the SAM.Meanwhile,the proposed displacement sensing system is simple and easy to operate,which is very practical and has a strong application prospect in the field of sensing.Based on the ± phase translation of the angular circular polarized light with two-beam ±1 vortex phases,the spin-state distribution of the local light field is linearly changed in one direction.Through the study and analysis of the self-selected characteristic curves,the measurement range of the experimental spin-structured light field can reach 1608).The main contents of this paper are as follows:First of all,I made a brief introduction to the development of displacement sensing technology at home and abroad,compared the advantages and disadvantages of optical displacement sensors,combined the dimension of light and nano-scale dielectric particles which is of different corresponding characteristics to polarized light,and illustrated the possibility and necessity of this study on optical self-selection structure and the one and only sensor.Second,I introduced optical theories scientifically such as angular momentum of light,its regulation,vector singularity beam,and vector diffraction,and also studied the special spin light field according to the Optical Sigmington,which provides a basis for the theoretical analysis and implementation of new displacement optical transaction.Third,after the theoretical model is put forward,I deduced the theoretical formula based on vector diffraction and Jones matrix theory,emulated and test the feasibility of the theoretical model and then got a theoretical detectable range obtained by data processing.At last,I tried to build the experimental system,measured the corresponding experimental result,established the model to process the original data,and verified the theoretical results,finally the conclusion is drawn.