Various studies on wood adhesives filled with conductive fillers for future application to structural monitoring showed a piezoresistive (resistance change with strain) response of the adhesive bond lines that is measurable under direct current. The results also showed a relatively high signal noise with low sensitivity. Using impedance spectroscopy as a measurement technique, the improvements in frequency-dependent piezoresistivity over DC (Direct Current) resistography of multifunctional bonded wood were studied. Beech specimens were bonded by one-component polyurethane prepolymer (1C-PUR) filled with carbon black and tested under shear load. The quality of the piezoresistive properties was described by calculating the signal-to-noise ratio (SNR) of the measured signal. A setup-specific frequency band with optimized SNR between 100 kHz and 1 MHz could be derived from the measurements. Several frequencies showed a signal with higher quality resulting in a higher SNR. Regardless of the variations in impedance spectra for all specimens, this frequency band provided several frequencies with improved signal quality. These frequencies give a more reliable signal with lower noise compared to the signal from DC resistography.

对填充有导电填料的木材粘合剂以供未来应用于结构监测的各种研究表明，粘合剂粘合线的压阻（电阻随应变变化）响应可在直流电流下进行测量。结果还显示出相对较高的信号噪声和较低的灵敏度。使用阻抗谱作为测量技术，研究了多功能粘合木材的频率相关压阻比 DC（直流）电阻的改进。山毛榉试样由填充炭黑的单组分聚氨酯预聚物 (1C-PUR) 粘合，并在剪切载荷下进行测试。通过计算测量信号的信噪比 (SNR) 来描述压阻特性的质量。可以从测量中推导出具有 100 kHz 和 1 MHz 之间优化 SNR 的设置特定频带。几个频率显示具有更高质量的信号，从而导致更高的 SNR。不管所有样本的阻抗谱如何变化，该频带都提供了几个具有改进信号质量的频率。与来自直流电阻描记法的信号相比，这些频率提供了噪声更低的更可靠的信号。