The rotary rise lifting lake device on lake platform is an auxiliary equipment supporting for the acoustic measurement

whose main function is to operate the measured device hanged on the structure mobile in rise

level

vertical and rotary direction.The hardware and software designs of the increment type photoelectric encoder in the device are given

and the relevant methods to improve the measurement precision are listed.Actual results show that platform position-detecting system composed of photoelectric encoder and high-speed pulse counter module is running stably

real-time and reliability.