Dissertation > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Optical instruments > Physical optical instruments > Interferometer

Research on Design of Alignment System Based on Interference Fringe

Author LiuHongXing
Tutor LinYuChi
School Tianjin University
Course Measuring Technology and Instruments
Keywords Collimator technology Interference fringes Feedback control Portability
CLC TH744.3
Type Master's thesis
Year 2007
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In recent years , a collimated laser beam measurement method as a straight-line basis over the fast development of laser collimator technology has been widely applied in the form of straightness , concentricity , flatness , parallelism bit error measurement . Difficult to overcome the problems due to the presence of the laser beam drift , the bending of light , atmospheric disturbances , the large size of the collimated laser technology detects long rail measurement accuracy has been difficult to improve . For laser collimation in the long Straightness error measurement characteristics of the design of this project based on the fringes of the portable laser collimator system . Small inclination value of the guide to the rail surface to be measured , the system will be collimated beam expander after the laser beam is projected on to the wedge-shaped optical plate , silicon photocell receiving the light beam before and after the wedge - shaped optical plate is formed after the surface reflection of the interference fringes , and then by subsequent processing circuitry , Finally , by a computer for processing measured values ??for each point of the guide surface , the calculated linear error of the measured rail . The system design of the feedback control circuit, a method of software filtering is calculated in real time the size of the DC offset in the two - way optical signal , and performs feedback control of the DC bias adjustment circuit with a proportional (P) control algorithm , to eliminate with the measurement of the optical signal includes the distance change , slow changes in the residual DC level, in order to improve the measurement accuracy of the system . The system design of the wireless communication circuit and the USB communication circuit , the measured data is sent by way of wireless communication to the wireless communication base station , and then from the base station of the wireless communication data transmitted to a computer via a USB interface ; the preparation of the application and use of VC 6.0 , to complete from USB interface to read the data , and save measurement data and calculation of rail straightness errors , making data transmission and processing of simplification . System component miniaturization , low-power design measurement subsystem , and lithium batteries to the power measurement subsystem , system portability and measurement facilitation . System stability , repeatability , calibration and long rail measurement experiments , the results show that the system can work properly , performance indicators have reached the intended target .

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