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探地雷达行业对AI的普遍误解是什么

探地雷达行业对AI的普遍误解是什么

易路解 | 编辑

摄图网 | 图片

AI时代的快速到来,正在颠覆着无损检测原有的图谱分析模式。行业从一开始对AI的排斥及否定,到逐渐接受,再到陆续推出了各自的AI功能,探地雷达行业快速进入了AI时代。

走访了许多研究单位、大学、检测公司和设备厂商,在实际交流过程中,都普遍存在一种认识:

AI就是一个软件。从网上寻找一些开源代码,搭建一个CNN、YOLO的AI模型框架,再向AI模型输入海量已经标注好的雷达图谱,就能够实现探地雷达病害自动识别。

这种认识看似符合当前计算机视觉领域的发展趋势,但从探地雷达专业技术本身来看,这种思路存在明显偏差。

很多企业认为:先收集大量雷达图像;再对图像进行人工标注;然后将图像输入深度学习模型;训练完成后即可实现自动识别。

甚至进一步认为:

数据量足够大,AI自然能够学会所有病害特征。

但从AI专业角度来看,探地雷达的图谱分析并不是一个普通图像问题。探地雷达数据表面上表现为一幅二维灰度图,但其本质并不是自然图像,而是电磁波在复杂介质中的传播响应。如果忽略电磁传播机理,仅仅把雷达图谱视为图片,那么训练得到的模型很难真正具备工程应用价值。

01
探地雷达图谱并不是普通图像

在计算机视觉领域,一张猫的照片无论使用哪台相机拍摄,猫依然是猫。在当前很多关于探地雷达智能识别的研究和工程实践中,一个非常普遍的误区是:将探地雷达图谱简单地等同于普通图像。认为只要采用成熟的计算机视觉技术,就能够像识别自然场景中的目标一样,实现病害的自动识别。然而,从探地雷达的工作原理来看,这种认识并不准确。

探地雷达图谱并不具备这种稳定性。探地雷达图谱本质上并不是地下目标的直接成像结果,而是电磁波在地下多层介质中传播、反射、折射、散射和衰减后形成的综合响应。图谱中的每一个像素值、每一条反射带、每一个双曲线特征,都受到电磁传播环境的影响。

同一个位置、同一个病害,在不同条件下可能呈现出完全不同的图谱特征。

02
影响探地雷达图谱特征的因素

影响探地雷达图谱特征的因素非常复杂,主要包括以下几个方面:

1. 天线频率

不同频率的天线,其探测深度和分辨率存在天然矛盾。通常情况下:

- 高频天线(如1GHz、2GHz)具有较高的分辨率,但探测深度较浅;

- 低频天线(如400MHz、200MHz)探测深度较大,但分辨率相对较低。

400MHz、900MHz、1GHz、2GHz天线获得的图谱往往存在显著差异,识别效果通常会明显下降。

2. 设备厂家

例如,同一段道路分别采用不同品牌设备进行检测,即使测线位置完全一致,最终获得的雷达图谱在振幅、波形形态、背景噪声水平以及纹理特征等方面也可能存在明显差异。

3. 增益参数

探地雷达数据通常需要经过大量预处理后才能进行解释,而增益处理是其中最关键的步骤之一。同一组原始数据采用不同的增益参数后,其图像表现可能完全不同。一些由于增益过强产生的伪异常,也可能被误认为是真实病害。

4. 路面结构

即使病害类型相同,其雷达响应也可能完全不同。以脱空病害为例:

- 在水泥混凝土路面中,脱空通常表现为板底强反射、多次反射以及明显的振铃现象;

- 在沥青路面中,层间脱空更多表现为界面反射增强和局部极性变化;

- 在桥面铺装结构中,由于钢筋网、铺装层以及防水层的共同影响,其图谱特征又与普通路面存在明显差异。

5. 介质含水状态

探地雷达对水极为敏感。

雨前、雨后、干燥季节、梅雨季节以及冻融季节,同一区域的雷达图谱都可能表现出完全不同的特征。这也是为什么许多在实验室环境下训练得到的模型,在实际工程现场往往难以保持稳定性能的重要原因。

只有充分理解电磁传播机理,才能正确理解图谱、解释图谱,并最终实现可靠的智能识别。

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  1. CONNECT:[ UseTime:0.000704s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000897s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000357s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000276s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000630s ]
  6. SELECT * FROM `set` [ RunTime:0.000268s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000639s ]
  8. SELECT * FROM `article` WHERE `id` = 796448 LIMIT 1 [ RunTime:0.001071s ]
  9. UPDATE `article` SET `lasttime` = 1782357631 WHERE `id` = 796448 [ RunTime:0.003404s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000268s ]
  11. SELECT * FROM `article` WHERE `id` < 796448 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000514s ]
  12. SELECT * FROM `article` WHERE `id` > 796448 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000528s ]
  13. SELECT * FROM `article` WHERE `id` < 796448 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000731s ]
  14. SELECT * FROM `article` WHERE `id` < 796448 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007890s ]
  15. SELECT * FROM `article` WHERE `id` < 796448 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002513s ]
0.108170s