Study on the Main Factors of Frequency Variation of LC Resonant Prestress Detection Method

Table 2

Ф9 mm experimental data of aluminum strands.

l/m	f1 (kHz)	f2 (kHz)	f3 (kHz)	f4 (kHz)	SD	RE (%)	f (kHz)
6.0	104.612	104.625	104.606	104.608	0.0086	0.0182	104.613
6.5	103.273	103.277	103.262	103.281	0.0082	0.0184	103.273
7.0	101.836	101.847	101.864	101.856	0.0122	0.0278	101.851
7.5	101.166	101.179	101.191	101.196	0.0134	0.0296	101.183
8.0	100.815	100.784	100.787	100.794	0.0140	0.0308	100.795
10.0	98.421	98.363	98.465	98.397	0.0426	0.1030	98.411
10.5	97.621	97.666	97.643	97.633	0.0192	0.0464	97.641
11.0	97.009	97.014	97.018	96.994	0.0106	0.0247	97.009
11.5	96.350	96.326	96.339	96.365	0.0166	0.0405	96.345
12.0	95.704	95.707	95.719	95.705	0.0072	0.0164	95.709
12.5	94.965	94.938	94.934	94.951	0.0140	0.0326	94.947
14.0	94.186	94.199	94.171	94.184	0.0115	0.0297	94.185
14.5	93.541	93.566	93.542	93.547	0.0117	0.0267	93.549
15.0	93.219	93.228	93.210	93.222	0.0076	0.0197	93.220
15.5	92.676	92.680	92.665	92.676	0.0064	0.0158	92.674
16.0	92.480	92.448	92.492	92.465	0.0188	0.0469	92.471