底面反射 meaning in English

basal reflection
base reflection

When the energy converters and the thickness of the steel plate are settled , the attenuation speed of the repetitious pulse reflected wave from the underside is only related to the reflectivity of the reinforced concrete interface
在钢板厚度和换能器确定的情况下,多次脉冲底面反射波的衰减速度只与钢-混凝土界面的反射率有关。
According to the test results from 18mm - thick - steel plate adhering to concrete , gas and oil , the obvious differences in the attenuation coefficient and number of bottom waves are found . the test results shows that it is feasible to adopt ultrasonic longitudinal wave reflection method to test the bonding quality of the steel and
采用超声纵波反射法单面检测钢-混凝土的粘结质量是可行的,采用底波衰减系数和底面反射波的个数作为判定钢-混凝土的粘结质量依据是有效的,所采用的理论分析模型是正确的。