Abstract: Wire alignment transducer is mainly used for long-term horizontal displacement monitoring of hydraulic structures such as dams. At present, most of the wire alignment transducers adopt RS485 communication mode, which is unstable and error-prone. Field workers need to connect laptops and write communication instructions to collect instrument data, inconvenient to field installation and commissioning. The wire alignment transducer developed in this research adopts microprocessor and linear array CCD, hence is of high acquisition precision and no electrical drift. Bluetooth communication and mobile APP are used to solve the problems of field parameter configuration and real-time data collection. Moreover, CAN field-bus is used to ensure the reliability of network transmission. Moisture-proof shell and moisture removing measures guarantee the long-term continuous work in humid environment such as hydropower station.The developed wire alignment transducer overcomes many shortcomings of traditional transducer, and the established automatic acquisition system can provide technical support for the safe operation of dams and other projects.

Key words: wire alignment transducer, linear array CCD, CAN field-bus, bluetooth communication, horizontal displacement monitoring