JT/T 840-2012 in English

本标准规定了车载式路面激光构造深度仪的产品工作原理与结构，工作环境条件，技术要求，试验方法，检验规则，标志、包装、运输和储存等内容。
本标准适用于激光测距设备检测路面构造深度的激光构造深度仪的生产、检验和使用。其他采用非接触式测距装置检测路面构造深度的仪器设备可参照使用。

Scope

This standard specifies the product working principle and structure, working environment conditions, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of the vehicle-mounted road surface laser construction depth gauge (hereinafter referred to as the laser construction depth gauge). This standard applies to the production, inspection and use of laser distance measuring equipment for detecting the depth of pavement structure depth. Other instruments and equipment that use non-contact distance measuring devices to detect the depth of pavement structures can be used with reference.