| 摘要 |
PURPOSE:To make it possible to perform accurate, highly reproducible objective measurement by measuring the property of a rock bed in the respective section obtained by dividing a rock bed region, normalizing the properties, stacking the results, and measuring the total property. CONSTITUTION:A rock bed to be measured is hit with a rock hammer 1. The generated vibration is detected with a piezoelectric element 2. The frequency of said signal is analyzed with an amplifier 3, an A/D converter circuit 4, a memory 5 and a FET processor 6. Thus the frequency spectrum distribution characteristic of a divided section is obtained. The frequency of the distribution characteristics is normalized in a normalizing circuit 8. The results are accumulated and added for every section in a stacking circuit 9, and a synthesized distribution pattern is obtained. A standard pattern stored in a standard memory 10 and said distribution pattern are compared, and the total property of the rock bed is judged 11. In this way, the averaged measured results are immediately obtained, the work can be performed in a short time and the measurement is performed by the vibration frequency analysis. Therefore the accurate measured results are obtained. |
