Surface and subsurface sensor performance in acoustically detecting the western drywood termite in naturally infested boards
Surface and subsurface sensor performance in acoustically detecting the western drywood termite in naturally infested boards
复制标题
表面和地下传感器在声学检测自然侵染板上的西部干木白蚁方面的性能
作者：
V. Lewis;A. Power;M. Haverty
现场收集的董事会显示视觉损坏的迹象，西部干木白蚁，Incisitermes未成年人，搜索与便携式声发射（AE）设备。根据横截面尺寸，用热熔胶粘在木材表面的平面传感器或螺纹插入木材20 mm的表面下传感器搜索板。AE监测位置的数量随长度而变化;然而，每个板至少收集三个1分钟AE记录。总共用5种不同处理方法中的1种处理108块板以控制白蚁。在治疗后3天以及1、2和4周对这些板进行AE监测。对32块板进行AE监测，但未进行治疗。后来解剖了木板，并对活的和死的白蚁进行了计数。在治疗前由AE搜索的板中，94%（108个中的102个）在解剖时含有白蚁。体积，数量的AE监测网站，预处理AE计数，和白蚁的数量在板解剖时发现的五个不同的治疗之间没有显着差异。治疗后AE计数与包含幸存者的板一致。关于传感器性能，有螺纹的表面下和平面附着传感器之间的AE计数没有显着差异。回归分析显示，增加AE计数和白蚁数量的董事会之间有统计学意义的相关性，虽然协会是低的。在解剖时，AE确定含有活白蚁（假阳性测试）的未处理板在100%（共13次）的时间内被成功检测到。未经处理的电路板，由AE确定不含活白蚁（假阴性测试），成功地检测到78.9%的时间（19个中的15个）。平均值比较表明，AE计数≥4/min可检测到治疗失败的存活者。这项研究的结果支持AE设备的能力和可靠性，以检测自然出没的板活白蚁侵扰。
Field-collected boards showing visual signs of damage by the western drywood termite, Incisitermes minor, were searched with a portable acoustic emission (AE) device. Depending on cross-sectional size, boards were either searched with a flat sensor that was hot-melt-glued to the wood surface or a subsurface sensor that was threaded 20 mm into the wood. The number of AE-monitored locations varied with length; however, at least three 1-minute AE recordings were collected for each board. In total, 108 boards were treated to control termites with 1 of 5 different treatment methods. These boards were AE monitored at 3 days, and at 1, 2, and 4 weeks post-treatment. Thirty-two boards were AE monitored but not treated. Boards were later dissected and live and dead termites were counted. Of the boards searched by AE prior to treatment, 94 percent (102 of 108) contained termites upon dissection. The volume, number of AE monitoring sites, pretreatment AE counts, and number of termites found in boards upon dissection were not significantly different among the five different treatments. Post-treatment AE counts corresponded well with boards containing survivors. Regarding sensor performance, there were no significant differences in AE counts between threaded subsurface and flat surface-attached sensors. Regression analyses revealed a statistically significant correlation between increasing AE counts and termite numbers for boards, although the association was low. Untreated boards that were determined by AE to contain live termites (test for false positives) upon dissection were successfully detected 100 percent (13 total) of the time. Untreated boards, determined by AE to not contain live termites (test for false negatives), were successfully detected 78.9 percent of the time (15 of 19). Comparisons of means suggest AE counts of ≥4 per minute can detect survivors from failed treatments. Results of this study support the ability and reliability of the AE device to detect live termite infestations in naturally infested boards.