Abstract: In order to achieve a pupose to virtual measure software program design for fiberoptic hydrophone, this paper uses characteristics of its output signals. Based on the nonNI acquisition card, the 3×3 coupler demodulation principle and its mathematical model are analysed and compared, and the interferometric fiberoptic hydrophone ITT virtual device detection program is designed. By calling a dynamic link library, the LabVIEWbased data collection program, the data processing and display program are developed, which makes up an ITT virtual detection system for fiberoptic hydrophone. Then, draws a conelusion that this virtual test system is of a good amplitude and frequency characteristics of the adaptive.

Key words: interferometric fiberoptic hydrophone, ITT, virtual testing, data collection, dynamic link library