| 摘要 |
<p>PURPOSE:To reduce the noise generated from a capacitor, shorten the recovery time and obtain a high sensitivity nuclear tetrapole resonance NQR remote detection device by using a material with low relative electric inductance for the capacitor constituting a tuning circuit for emission and reception coil. CONSTITUTION:For capacitors in a tuning circuit, in other words, a variable capacitor 15 for controlling resonance frequency and a variable capacitor 16 for controlling impedance, an air variable condenser, a vacuum condenser or combinations of these variable condensers and fixed condensers such as a mica condenser and a vacuum condenser is used. By using a capacitor with relative electric induction below 8 for inter-electrode material like this, the noise which a capacitor produces after emission pulse, can be minimized. Also the recovery time 21 when the NQR signal can not be detected, can be shortened and so the detection sensitivity can be raised. If a capacitor with the relative electric inductance below 8 for inter-electrode material is used in the tuning circuit, partial use has an effect, however total use has a greater effect.</p> |
