| 摘要 |
<p>PURPOSE:To inspect the defect of a glass fiber with ease of handling without requiring microwaves of GHz order and high-frequency power source of high output by providing an electrode pair installed in proximity to the glass fiber and an oscillation circuit and detecting circuit. CONSTITUTION:An insulating tube 2, a capacitor 3 for detection which is formed in a pair with the electrodes 3a, 3b for detection, a coil 4, the oscillation circuit 5, an f-V conversion circuit 6, and the detecting circuit 7 are provided. The part having the defect where a very small piece of metals, such as iron and nickel, intrudes into the glass monofilament approaches the capacitor 3, the capacitance of the capacitor changes. When, thereupon, the capacitor 3 is formed as a part of the oscillation circuit 5, the oscillation frequency thereof changes correspondingly. When this capacitor is coupled as the load of the oscillation circuit 5, the magnitude of the load changes correspondingly. The defect of the glass fiber is, therefore, detected by detecting the electrical change (amplitude, frequency change, etc.) generated in the capacitor 3 with the detecting circuit 7.</p> |
