This Regulation is applicable to the first verification, subsequent verification and in-use inspection of vehicle bearing pavement laser video distress detecting system (hereinafter referred to as "distress detecting system").
2 Normative References
JTJ 059 Field Test Methods of Subgrade and Pavement for Highway Engineering
JT/T 678-2007 Vehicle Bearing Road Laser Video Distress Detecting System
For purpose of this Regulation, the current and effective editions of the documents above shall apply.
3 General
Laser video distress detecting system is a device to detect and analyze road pavement deformation and crack through high speed digital camera technique and light source like three-dimensional imaging laser bean, strong light and sun light, and it consists of three-dimensional imaging laser source, strong light source or sun light source, high speed digital high-resolution imaging device, longitudinal distance sensor, road distress computer digital image processing system (as shown in Figure 1).
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Figure 1 Diagram of laser video distress detecting system
a) Road deformation detecting system; b) Road crack detecting system
4 Measuring Performance Requirement
4.1 Road crack width discrimination: where road crack width is not less than 2mm, the discrimination rate is 100% and the indication error of crack width value identification shall not be greater than 1mm.
JJG (交通) 077-2007 The following standards are cited：
