Sensor apparatus and water amount measurement apparatus

A sensor apparatus, comprising:

• a sensor head that includes a first probe and a second probe, the first probe including a first tiny antenna section for transmission and a second tiny antenna section for transmission, the second probe including a first tiny antenna section for reception and a second tiny antenna section for reception, the second probe being arranged at a predetermined distance from the first probe;
• and
• a measurement unit that includes a controller that generates a measurement signal that includes information regarding characteristics of a propagation of an electromagnetic wave in a medium between the first tiny antenna section for transmission and the first tiny antenna section for reception, and information regarding characteristics of the propagation of the electromagnetic wave in the medium between the second tiny antenna section for transmission and the second tiny antenna section for reception, wherein
• a distance between the first tiny antenna section for transmission and the first tiny antenna section for reception, and a distance between the second tiny antenna section for transmission and the second tiny antenna section for reception are different from each other,
• the first probe includes a fold portion,
• the first tiny antenna section for transmission is provided to the fold portion, and
• the second tiny antenna section for transmission is provided to a tip of the first probe.

A sensor apparatus, comprising:

• a sensor head that includes a first probe and a second probe, the first probe including a first tiny antenna section for transmission and a second tiny antenna section for transmission, the second probe including a first tiny antenna section for reception and a second tiny antenna section for reception, the second probe being arranged at a predetermined distance from the first probe;
• and
• a measurement unit that includes a controller that generates a measurement signal that includes information regarding characteristics of a propagation of an electromagnetic wave in a medium between the first tiny antenna section for transmission and the first tiny antenna section for reception, and information regarding characteristics of the propagation of the electromagnetic wave in the medium between the second tiny antenna section for transmission and the second tiny antenna section for reception, wherein
• a distance between the first tiny antenna section for transmission and the first tiny antenna section for reception, and a distance between the second tiny antenna section for transmission and the second tiny antenna section for reception are different from each other,
• the sensor head includes a first signal-transmission path and a second signal-transmission path, the first signal-transmission path passing between the first tiny antenna section for transmission and the first tiny antenna section for reception, or between the first tiny antenna section for transmission and the second tiny antenna section for reception, the second signal-transmission path passing between the second tiny antenna section for transmission and the first tiny antenna section for reception, or between the second tiny antenna section for transmission and the second tiny antenna section for reception, and
• each of a difference in path length between the first signal-transmission paths, a difference in path length between the second signal-transmission paths, and a difference in path length between the first signal-transmission path and the second signal-transmission path, is greater than or equal to a predetermined effective wavelength.