SDU NanoSYD, Mads Clausen Institute, University of Southern Denmark, Alsion 2, 6400 Sønderborg, Denmark.
SDU Mechatronics, Department of Mechanical and Electrical Engineering, University of Southern Denmark, Alsion 2, 6400 Sønderborg, Denmark.
Sensors (Basel). 2023 Jan 17;23(3):1093. doi: 10.3390/s23031093.
This work presents an approach for the estimation of the adsorbed mass of 1,5-diaminopentane (cadaverine) on a functionalized piezoelectrically driven microcantilever (PD-MC) sensor, using a polynomial developed from the characterization of the resonance frequency response to the known added mass. This work supplements the previous studies we carried out on the development of an electronic nose for the measurement of cadaverine in meat and fish, as a determinant of its freshness. An analytical transverse vibration analysis of a chosen microcantilever beam with given dimensions and desired resonance frequency (>10 kHz) was conducted. Since the beam is considered stepped with both geometrical and material non-uniformity, a modal solution for stepped beams, extendable to clamped-free beams of any shape and structure, is derived and used for free and forced vibration analyses of the beam. The forced vibration analysis is then used for transformation to an equivalent electrical model, to address the fact that the microcantilever is both electronically actuated and read. An analytical resonance frequency response to the mass added is obtained by adding simulated masses to the free end of the beam. Experimental verification of the resonance frequency response is carried out, by applying known masses to the microcantilever while measuring the resonance frequency response using an impedance analyzer. The obtained response is then transformed into a resonance frequency to the added mass response polynomial using a polynomial fit. The resulting polynomial is then verified for performance using different masses of cantilever functionalization solution. The functionalized cantilever is then exposed to different concentrations of cadaverine while measuring the resonance frequency and mass of cadaverine adsorbed estimated using the previously obtained polynomial. The result is that there is the possibility of using this approach to estimate the mass of cadaverine gas adsorbed on a functionalized microcantilever, but the effectiveness of this approach is highly dependent on the known masses used for the development of the response polynomial model.
这项工作提出了一种使用从特征化已知附加质量的共振频率响应得到的多项式来估计 1,5-二氨基戊烷（腐胺）在功能化压电驱动微悬臂梁（PD-MC）传感器上的吸附质量的方法。这项工作补充了我们之前进行的用于测量肉类和鱼类中腐胺的电子鼻开发的研究，腐胺是衡量其新鲜度的一个决定因素。对给定尺寸和所需共振频率（>10 kHz）的选定微悬臂梁进行了横向振动分析。由于梁被认为具有几何和材料不均匀性，因此推导出了一个适用于任何形状和结构的自由-自由梁的阶跃梁模态解，并将其用于梁的自由和强迫振动分析。然后，强迫振动分析用于转换为等效的电模型，以解决微悬臂梁既是电子驱动又是读取的事实。通过在梁的自由端添加模拟质量来获得对附加质量的共振频率响应。通过将已知质量施加到微悬臂梁上，同时使用阻抗分析仪测量共振频率响应，对共振频率响应进行了实验验证。然后，将得到的响应转换为附加质量响应多项式的共振频率响应，使用多项式拟合。然后，使用不同质量的悬臂梁功能化溶液对所得多项式进行性能验证。然后将功能化的悬臂梁暴露于不同浓度的腐胺中，同时使用之前获得的多项式估计吸附的腐胺的共振频率和质量。结果表明，有可能使用这种方法来估计功能化微悬臂梁上吸附的腐胺气体的质量，但这种方法的有效性高度依赖于用于开发响应多项式模型的已知质量。
