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首页> 外文期刊>Computers and Electronics in Agriculture >Comparison of acoustic sensor systems for quality analysis of asparagus using scanning laser vibrometry for visualization.
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Comparison of acoustic sensor systems for quality analysis of asparagus using scanning laser vibrometry for visualization.

机译：使用扫描激光振动法可视化芦笋质量分析的声传感器系统的比较。

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Automatic detection of hollow white asparagus spears (Asparagus officinalis L.) is a severe issue. One promising approach is the computerized acoustic resonance analysis. The principal components of newly developed acoustic sensor systems were investigated for their technical usability to stimulate and measure asparagus vibrations. Each tested measurement setup included a sample holder with an integrated sensor (piezo film or condenser microphone) and a mechanical excitation device (piezo actuator, midget solenoid, tiny hammer). Non-contacting scanning laser vibrometry was used as an appropriate tool to measure characteristic properties of the experimental setups. Without altering vibration conditions, this technology allowed to visualize vibration response of test specimens (asparagus spears and wooden rods) as well as to evaluate coupling properties between sample and sample holder and the sensitivities of sensors. Each setup enabled free vibration of samples investigated. In addition, reference sensors were proved to be placed at suitable positions for signal detection away from nodal points of oscillation. From the presented results, it turned out that, compared to piezo film sensors, specifically the chosen microphones have the better adapted frequency characteristic considering the vibration behavior of asparagus spears. The measured frequency characteristic of the piezo film sensors suggests that attention has to be focused on the coupling conditions between sample, sample holder and machinery
机译：自动检测空心的白色芦笋长矛（Asparagus officinalis L.）是一个严重的问题。一种有前途的方法是计算机化的声共振分析。研究了新开发的声传感器系统的主要组件在刺激和测量芦笋振动方面的技术可用性。每个测试的测量设置都包括一个带有集成传感器（压电膜或电容麦克风）的样品架和一个机械激励装置（压电致动器，小型螺线管，小锤子）。非接触式扫描激光振动法被用作测量实验装置特征特性的合适工具。在不改变振动条件的情况下，该技术可以可视化测试样品（芦笋矛和木棒）的振动响应，并评估样品和样品架之间的耦合特性以及传感器的灵敏度。每种设置均可使所研究样品自由振动。此外，事实证明，参考传感器被放置在合适的位置，用于远离振荡节点的信号检测。从给出的结果可以看出，与压电薄膜传感器相比，考虑到芦笋鱼叉的振动行为，特别是所选的麦克风具有更好的自适应频率特性。压电薄膜传感器的测量频率特性表明，必须将注意力集中在样品，样品架和机械之间的耦合条件上

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