Detection of Simulated Blister in Medium Density Fiberboard Using Ultrasonic Phase Difference Method

QIU Tian; XU Zhaojun; WANG Yuxuan; WANG Junfeng; WANG Xinzhou

doi:10.12326/j.2096-9694.2025031

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Detection of Simulated Blister in Medium Density Fiberboard Using Ultrasonic Phase Difference Method
1.College of Materials Science and Engineering，Nanjing Forestry University，Nanjing 210037，Jiangsu，China
2.Guangxi Zhuang Autonomous Region Academy of Forestry Sciences，Nanning 530002，Guangxi，China
3.Guangxi Forestry Laboratory，Nanning 530002，Guangxi，China
Vol. 39, Issue 5, Pages: 39-48(2025)
DOI： 10.12326/j.2096-9694.2025031
稿件说明：

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邱添,徐兆军,王宇轩等.基于超声波相位差法的中密度纤维板鼓泡模拟缺陷检测[J].木材科学与技术,2025,39(05):39-48. DOI： 10.12326/j.2096-9694.2025031.

QIU Tian,XU Zhaojun,WANG Yuxuan,et al.Detection of Simulated Blister in Medium Density Fiberboard Using Ultrasonic Phase Difference Method[J].Chinese Journal of Wood Science and Technology,2025,39(05):39-48. DOI： 10.12326/j.2096-9694.2025031.

摘要

中密度纤维板（medium density fiberboard，MDF）在生产过程中常出现鼓泡缺陷，影响其性能。为了实现MDF缺陷的精准检测，研究提出利用超声波相位差法检测中密度纤维板内部鼓泡缺陷的方法

，选取6种不同厚度的中密度纤维板，模拟内部鼓泡缺陷，结合示波器与功率放大器分析超声波在板材无缺陷区与缺陷区的相位特性。结果表明：超声波穿过MDF无缺陷区域时，相位在－180

°~

180

之间周期性变化；而在鼓泡缺陷区域处，频率低于230 kHz时，相位在－180

和180

之间变化；频率超过230 kHz后，相位范围急剧缩小至－50

~50

。因此，230 kHz及以上的频段适用于检测MDF内部的鼓泡缺陷。超声波相位与鼓泡缺陷的存在位置与厚度呈线性相关，相关系数达到0.9以上，鼓泡距离表面越远或鼓泡层厚度越大，超声波相位越高。研究为中密度纤维板生产线提供可定位缺陷深度的无损检测方案，对实现纤维板质量在线自动化与智能化检测具有重要意义。

Abstract

Blister

a common defect that frequently appears during the production of medium density fiberboard (MDF)

compromises its performance. To accurately detecting these internal defects

this study proposes an ultrasonic phase-difference method specifically tailored for MDF. Six MDF panels of various thicknesses were fabricated. Artificial blisters were constructed in order to systematically investigate the ultrasonic phase characteristics in both defect-free and blister-simulation regions using an oscilloscope and a power amplifier. When ultrasonic waves traverse defect-free MDF

the phase exhibits a periodic variation between -180° and +180°. In contrast

when the wave interacts with a blister

the phase remains within the same range only if the excitation frequency is below 230 kHz

while when it is above 230 kHz

the phase range collapses abruptly to between -50° and +50°. Consequently

frequencies of 230 kHz and higher are recommended for reliable blister detection. A strong linear correlation (Pearson’s

≈0.9) was formed between the measured phase and the geometrical attributes of the blister: its depth from the surface and its thickness. Specifically

the phase increases monotonically with increasing both defect depth and thickness. The proposed method offers a non-destructive

depth-resolving inspection solution that can be integrated into industrial MDF production lines

thereby offering significant value for the realization of online

automated

and intelligent quality monitoring of fiberboard production.

关键词

Keywords

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