Development of low cost micromirror based laser vibrometer for measuring underwater transducer's vibrator

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Acoustics wave system is widely used for underwater communication, navigation, ocean mapping and fishery. An underwater acoustic wave system consists of a sound generator (projector) and a sound receiver (hydrophone) or one transducer with both sound generation and receiving functions. An underwater acoustic transducer is composed of the vibrator (core component of a transducer), rubber boot or sealing adhesive and housing. In order to achieve the effective and efficient optimization of the transducer, the vibration (vibration amplitude of each point of the vibrator surface) of the vibrator needs to be experimentally obtained for design verification and optimization iteration. Currently the scanning laser vibrometer can meet the performance requirement (both accuracy and scanning function). But its price ($150,000 ~ $300,000) is too high to be affordable to small and midsize business because it is for the precise vibration measurement of large parts with the performance several orders of magnitude higher than the requirements for measuring the transducer's vibrator. This project will develop a low cost micromiror based laser vibrometer for measuring the transducer's vibrator, in which a micromirror is integrated with a low cost single point laser vibrometer to realize scanning function. The system consists of a single point laser vibrometer with accuracy satisfying the requirement and low cost, a 2D rotation micromirror, a control circuit, and the extraction software. The micromirror's steering and the single point vibrometer's measurement are synchronized to realize scanning function. The micromirror based laser vibrometer can meet both the performance and cost requirements for direct measuring the vibration of an underwater transducer's vibrator, which can be afforded by the industrial partner to optimize its underwater acoustic transducers for better performance to improve their competitiveness.