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In the test of sample appearance condition, the original value of real-time monitoring is an indispensable means for detecting defects changes of object , In view of the requirements that the original value monitoring of the information Should have accurate positioning monitoring and controlled information of sample, deflection angle detection device is built up for Pan-Tilt Zoom(PTZ), feedback deflection angle pulse information to the decoder, the pulse signal is processed by the establishes deflection angle calculation formula, then feedback to the host, thus work station in the upper machine (PC), decoder, together with Pan-Tilt constitute the feedback location PTZ control system, Practice shows that the introduction of this feedback deflection angle data, the upper machine (PC) can master PC instruction execution status at any time, according to the feedback data of Pan-Tilt deflection angle from the lower computer, precise control of PTZ is achieved, thus the operability and intelligent level of PTZ is raised.