A transparency, e.g. an aircraft laminated windshield, includes one or more moisture sensors to monitor moisture penetration to monitor performance of the moisture barrier. At least one of the moisture sensors includes a dielectric between and in electrical contact with two electrically conductive electrodes. Alternating electrical current is applied to the electrodes to measure the complex impedance (ohms) of the dielectric to determine the amount of moisture within the laminated windshield in the area of the moisture sensor. With the information provided by the moisture sensors performance of the windshield is available to schedule timely repair or replacement of the windshield that is performing outside of acceptable limits.

In a dielectric characteristic measurement method, a step of mounting a sample of which dielectric characteristic is measured on an open resonator and adjusting a position of the sample includes: a first measurement step for performing a first resonance measurement by sweeping a predetermined sweep frequency range at a first number of measurement points; and a second and subsequent measurement steps for performing a plurality times of resonance measurement following the first resonance measurement, wherein each of the plurality times of resonance measurement is performed by sweeping a sweep frequency range specified based on an immediately preceding resonance measurement at a second number of the measurement points which is less than the first number of the measurement points, and the sweep frequency range of a second resonance measurement in the plurality times of resonance measurement is specified based on the first resonance measurement.

Proposed is a measurement device. Provided with a waveguide having a first contact surface coming into face-to-face contact with a subject to be measured, the measurement device includes a detachable part provided at the waveguide, the detachable part coming into close contact with the first contact surface, and an extended part extending from the detachable part, wherein the extended part is provided with an extension hole communicating with an original hole provided in the waveguide. The extension hole and the original hole are provided in the same size and the same shape, the extension hole extends in a direction the same as an extension direction of the original hole, and the extension hole is aligned with the original hole.