关键词: 金属锚杆, 无损测量, 谐振频率, 偶极天线, AD9913

Abstract: Abstract: For reflection signal processing complex and measuring length limited of audio frequency stress wave method applied in the metal anchor non-destructive measurement.Developed a new non-destructive measurement method based on the half wave dipole antenna theory,by adding a metal reference line,with the single metal anchor pole equivalent to half wave dipole antenna,using the AD9913 generates a sinusoidal signal 0~100MHz is coupled into the anchor pole,obtain the first corresponding signal resonance frequency,in accordance with the relationship between frequency and wavelength,and the wavelength and the length of the antenna,calculate the length of the metal pole.In the whole measurement process,circuit for signal phase characteristics do not need strict constraints,for more than 10m long bolt of actual measurement,absolute error can be controlled within 5 %.