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

声波系统广泛应用于水下通信、导航、海洋测绘、渔业等领域。 水下声波系统由发音器(投影仪)和接收器组成。 (水听器)或一个同时具有发声和接收功能的换能器。一种水声 传感器由振子(传感器的核心部件)、橡胶套或密封胶和 住房。为了实现换能器的有效和高效的优化，振动(振动 振子表面每个点的振幅)需要通过实验获得振子的设计 验证和优化迭代。目前的扫描式激光测振仪能够满足性能要求 要求(包括精度和扫描功能)。但它的价格(15万美元至30万美元)太高了， 对于中小型企业来说价格实惠，因为它用于大型部件的精确振动测量 其性能比测量传感器的要求高出几个数量级 振动器。该项目将开发一种低成本的基于微镜的激光测振仪，用于测量传感器的 振动器，将微镜与低成本单点激光测振仪集成在一起实现扫描 功能。该系统由精度满足要求的单点激光测振仪和测振仪组成 低成本，一个2D旋转微镜，一个控制电路，以及提取软件。微镜的转向 与单点测振仪的测量同步，实现扫描功能。微镜 基于激光测振仪可以同时满足直接测量振动的性能和成本要求 水下换能器振荡器，这可以由工业合作伙伴提供，以优化其 水声换能器以更好的性能提高自身的竞争力。

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.