| 摘要 |
PROBLEM TO BE SOLVED: To overcome a problem of being unable to detect liquid having a low specific dielectric constant. SOLUTION: In this moisture sensor, an insulating covering is arranged on the outer periphery of a conductor, a conductive shielding layer is arranged outside of it, a large number of through holes are formed for forming an air layer by taking air in the conductive shielding layer, and when moisture sticks to the conductive shielding layer, the specific dielectric constant of the air layer of the conductive shielding layer changes, and stray capacitance between the conductor and the conductive shielding layer changes so that moisture is detected from a change in the stray capacitance. This moisture detecting device has the moisture sensor and an oscillator for converting a change in the stray capacitance of the moisture sensor into a change in a frequency, and is constituted so that the conductor of the moisture sensor is connected to the oscillator, the conductive shielding layer of the moisture sensor is grounded, and a capacitor is arranged between the conductor of the moisture sensor and the oscillator. |
